Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Du, C.G." wg kryterium: Autor


Tytuł:
One shot profilometry using iterative two-step temporal phase-unwrapping
Autorzy:
Du, G.
Wang, M.
Zhou, C.
Si, S.
Li, H.
Lei, Z.
Li, Y.
Tematy:
phase unwrapping
composite fringe pattern
Fourier transform
two-step temporal phase-unwrapping
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/173912.pdf  Link otwiera się w nowym oknie
Opis:
This paper reviews two techniques that have been recently published for three-dimensional profilometry and proposes one shot profilometry using iterative two-step temporal phase-unwrapping by combining the composite fringe projection and the iterative two-step temporal phase unwrapping algorithm. In temporal phase unwrapping, many images with different frequency fringe pattern are needed to project, which would take much time. In order to solve this problem, Ochoa proposed a phase unwrapping algorithm based on phase partitions using a composite fringe. However, we found that the fringe order determined through the construction of phase partitions tended to be imprecise. Recently, we proposed an iterative two-step temporal phase unwrapping algorithm, which can achieve high sensitivity and high precision shape measurement. But it needs multiple frames of fringe images which would take much time. In order to take into account both the speed and accuracy of three-dimensional shape measurement, we get a new, and more accurate unwrapping method based on a composite fringe pattern by combining these two techniques. This method not only retains the speed advantage of Ochoa’s algorithm, but also greatly improves its measurement accuracy. Finally, the experimental evaluation is conducted to prove the validity of the proposed method.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved method for phase wraps reduction in profilometry
Autorzy:
Du, G.
Wang, M.
Zhou, C.
Si, S.
Li, H.
Lei, Z.
Li, Y.
Tematy:
phase unwrapping
zero-padding
Fourier transform
carrier-frequency
profilometry
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/173793.pdf  Link otwiera się w nowym oknie
Opis:
In order to completely eliminate, or greatly reduce the number of phase wraps in 2D wrapped phase map, Gdeisat and co-workers proposed an algorithm, which uses shifting the spectrum towards the origin. But the spectrum can be shifted only by an integer number, meaning that the phase wraps reduction is often not optimal. In addition, Gdeisat’s method will take much time to make the Fourier transform, inverse Fourier transform, select and shift the spectral components. In view of the above problems, we proposed an improved method for phase wraps elimination or reduction. First, the wrapped phase map is padded with zeros, the carrier frequency of the projected fringe is determined by high resolution, which can be used as the moving distance of the spectrum. And then realize frequency shift in spatial domain. So it not only can enable the spectrum to be shifted by a rational number when the carrier frequency is not an integer number, but also reduce the execution time. Finally, the experimental results demonstrated that the proposed method is feasible.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Establishment of 5-Fluorouracil-resistant canine mammary tumor cell line
Autorzy:
Zhou, B.
Zhang, D.
Pei, S.M.
Zhang, K.
Du, H.C.
Jin, Y.P.
Lin, D.G.
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/30283.pdf  Link otwiera się w nowym oknie
Opis:
Canine mammary tumors are the most common neoplasms in intact female dogs. The surgery cannot always solve the problem, chemotherapy are recommend to these patients. However, chemotherapy could always fail because of multidrug resistance (MDR). Through stepwise increasing 5-Fluorouracil (5-FU) concentration in the culture medium, a 5-FU-resistant canine mammary tumor cell line CMT7364/5-FU was established to disclose the molecular mechanism of the drug resistance. Cell morphology, cell sensitivity to drugs, growth curves, expression of proteins, and chemo-sensitivity in vivo were compared between the parental cell line and resistant cell line. As compared it to its parental cell line (CMT7364), CMT7364/5-FU showed different morphology, cross-resistant to other chemo-drugs and a prolonged population doubling time (PDT). The drug efflux pump proteins (ABCB1 and ABCG2) in CMT7364/5-FU were up-regulated. In vivo, the similar result revealed that CMT7364/5-FU cell line was more resistant to 5-FU. In conclusion, a 5-FU-resistant canine mammary tumor cell line (CMT7364/5-FU) was successfully established, it can serve as a good model for researching the mechanism of MDR and screening effective agents to reverse drug resistance.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The unsteadiness of tip clearance flow and its effect to stability of transonic axial compressor
Nieustaloność przepływu w szczelinie wierzchołkowej i jej wpływ na stabilność pracy przydźwiękowej sprężarki osiowej
Autorzy:
Hu, J. F.
Zhu, X. C.
Ou-Yang, H.
Tian, J.
Wu, Y. D.
Qiang, X. Q.
Zhao, G.
Du, Z. H.
Tematy:
tip leakage flow
compressor
stability
Pokaż więcej
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/281445.pdf  Link otwiera się w nowym oknie
Opis:
The steady and unsteady RANS simulations of a transonic compressor rotor (NASA rotor 37) are performed to investigate the tip clearance flow characteristic and correlations between tip leakage flow and compressor stability. For steady simulations, the results are compared with the aerodynamic probe and laser anemometer data. The speed lines and span-wise aerodynamic parameters agree well with the experimental data. On the other hand, the tip clearance flow of unsteady simulations are analysed clearly at a near stall condition. The results show that there is a mass flow rate boundary. The tip clearance flow oscillates substantially with a frequency about 50% BPF when the mass is less than that, which is caused by tip clearance flow, shock, and the interaction between them and the oncoming flow. The interface between the oncoming flow and clearance flow shifts forward, and the tip clearance flow may spill over into the adjacent blade passage as the mass flow decreases, which may results in the spike stall inception.
W pracy przedstawiono symulacje stanu ustalonego i nieustalonego przydźwiękowej sprężarki osiowej (turbina NASA 37) z zastosowaniem metody Reynoldsa uśredniania równań Naviera-Stokesa (RANS) w celu zbadania charakterystyki przepływu w szczelinie wierzchołkowej oraz określenia zależności pomiędzy stratami związanymi z upływem w tej szczelinie a stabilnością pracy sprężarki. Wyniki symulacji stanu ustalonego porównano z danymi doświadczalnymi uzyskanymi za pomocą sondy aerodynamicznej i laserowego wiatromierza. Wyznaczone wzdłuż rozpiętości sprężarki linie prędkości przepływu i jego parametry aerodynamiczne okazały się zgodne z danymi doświadczalnymi. W przypadku symulacji stanu nieustalonego, analizę przepływu w szczelinie wierzchołkowej przeprowadzono dla warunków bliskich oderwania, tj. utraty wydajności sprężarki, wyznaczając graniczny wydatek przepływu dla takiej sytuacji. Poniżej tej granicznej wartości, zmiany przepływu w szczelinie oscylują z częstotliwością sięgającą 50% częstotliwości przejścia łopatek (tzw. BPF), co jest konsekwencją interakcji wywołanej zderzeniem przepływu z falą napływową w szczelinie wierzchołkowej. Powierzchnia tej interakcji przesuwa się do przodu, a sam przepływ może rozpaść się na fragmenty znajdujące ujście w kanałach przyległych łopatek. Zjawisko to zachodzi przy malejącym wydatku, a to z kolei może indukować oderwanie przepływu skokowymi zmianami mocy współpracującego silnika.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revisiting the PeVatron candidate MGRO J1908+06 with an updated H.E.S.S. analysis
Autorzy:
Holler, M.
Nayerhoda, A.
Funk, S.
Renaud, M.
Reville, B.
Vincent, P.
Seyffert, A.
Davies, J.
Davids, I. D.
Prokhorov, D.
Marti'i-Devesa, G.
Baghmanyan, V.
Fichet de Clairfontaine, G.
Katz, U.
Konno, R.
Senniappan, M.
Zargaryan, D.
Bulik, T.
Marcowith, A.
Curlo, M.
Donath, A.
Puehlhofer, G.
Armand, C.
Komin, N.
Noel, Angel
Reimer, A.
Egberts, K.
White, R.
Fontaine, G.
Chen, A.
Steenkamp, R.
O'Brien, P.
Gabici, S.
van der Walt, J.
Huber, D.
Kostunin, D.
Meintjes, P.
Yusafzai, A.
Montanari, A.
Moore, C.
Khangulyan, D.
Venter, C.
Żywucka, N.
Ernenwein, J. P.
Du Plessis, L.
Bi, B.
Shiningayamwe, K.
Lamanna, G.
Tavernier, T.
Hinton, J.
Lemoine-Goumard, M.
Moulin, E.
Watson, J. J.
Lohse, T.
Leuschner, F.
Malyshev, D.
Veh, J.
Zech, A.
Katarzynski, K.
Steinmassl, S.
Romoli, C.
Tuffs, R.
Bony (de), M.
Böttcher, M.
Giavitto, G.
Spir-Jacob, M.
Thiersen, H.
Einecke, S.
Zmija, A.
Barnacka, Anna
Joshi, V.
Barbosa Martins, V.
Zdziarski, A.
Holch, T.
Batzofin, R.
Majumdar, J.
Damascene Mbarubucyeye, J.
Meyer, M.
Lypova, I.
Moderski, R.
Santangelo, A.
Schwanke, U.
Völk, H. J.
Fiasson, A.
Zanin, R.
Brose, R.
Specovius, A.
Jamrozy, Marek
Murach, T.
Khelifi, B.
Tsuji, N.
Devin, J.
Hermann, G.
Thorpe-Morgan, C.
Vasileiadis, G.
Sun, L.
Ohm, S.
van Soelen, B.
Huang, Z.
Dreyer, L.
Kreter, M.
Jung, I.
Werner, F.
Becherini, Y.
Zhu, S.
Schutte, H.
Rueda Ricarte, H.
Doroshenko, V.
Lemiere, A.
Le Stum, S.
Hattingh, S.
Gallant, Y.
Kosack, K.
Barnard, M.
Takahashi, T.
Lenain, J. P.
Bylund, T.
Chand, T. B.
Berge, D.
Marchegiani, P.
Mares, A.
Marx, R.
Duffy, C.
Parsons, D.
Pita, S.
Ashkar, H.
Peron, G.
Prokoph, H.
Tomankova, L.
Punch, M.
Tsirou, M.
Spencer, S. T.
Horns, D.
Uchiyama, Y.
Boisson, C.
Wong, Y. W.
Ait-Benkhali, F.
Cangemi, F.
Kundu, A.
Zacharias, M.
Morris, P.
Djannati-Ataï, A.
Niemiec, J.
Armstrong, T.
Giunti, L.
Mitchell, A.
Panter, M.
Salzmann, H.
Kasai, E.
Wierzcholska, Alicja
Olivera-Nieto, L.
Fegan, S.
Abdalla, H.
Rudak, B.
Stawarz, Łukasz
Glawion, D.
Sinha, A.
Kluzniak, W.
Hofmann, W.
Panny, S.
Brun, F.
Cotter, G.
Marandon, V.
Chambery, P.
Breuhaus, M.
Mackey, J.
Fuessling, M.
Luashvili, A.
Tanaka, T.
Sailer, S.
Wagner, S.
Anguener, O.
Zouari, S.
Dmytriiev, A.
Shapopi, J. N. S.
Aharonian, F.
van Eldik, C.
Catalano, J.
Glicenstein, J. F.
Simoni, R.
Terrier, R.
Muller, J.
Feijen, K.
Bolmont, J.
Sanchez, D.
Sasaki, M.
Stegmann, C.
Maurin, G.
Reimer, O.
Nakashima, K.
Steppa, C.
Taylor, A.
Spackman, H.
Dalgleish, H.
Reichherzer, P.
Davids, H.
Sahakian, V.
Levy, C.
Rowell, G.
Hoischen, C.
Ruiz Velasco, E.
Ostrowski, Michał
Hörbe, M.
Ona-Wilhelmi (de), E.
van Rensburg, C.
Schaefer, J.
Casanova, S.
Naurois (de), M.
Quirrenbach, A.
Backes, M.
Schüssler, F.
Grondin, M. H.
Arcaro, C.
Tluczykont, M.
Jankowsky, F.
Bernloehr, K.
Kukec Mezek, G.
Vink, J.
Frans, L.
Klepser, S.
Caroff, S.
Sol, H.
Yassin, H.
Remy, Q.
Rieger, F.
Haupt, M.
Poireau, V.
Oberholzer, L. L.
Mohrmann, L.
Opis:
Detecting and studying galactic gamma-ray sources emitting very-high energy photons sheds light on the acceleration and propagation of cosmic rays presumably created in these sources. Currently, there are few sources emitting photons with energies exceeding 100 TeV. In this work we revisit the unidentified source MGRO J1908+06, initially detected by Milagro, using an updated H.E.S.S. dataset and analysis pipeline. The vicinity of the source contains a supernova remnant and pulsars as well as molecular clouds. This makes the identification of the primary source(s) of galactic cosmic rays as well as the nature of the gamma-ray emission challenging, especially in light of the recent HAWC and LHAASO detection of the high energy tail of its spectrum. Exploiting the better angular resolution as compared to particle detectors, we investigate the morphology of the source as well as its spectral properties.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Science verification of the new FlashCam-based camera in the 28 m telescope of H.E.S.S.
Autorzy:
Holler, M.
Nayerhoda, A.
Funk, S.
Renaud, M.
Reville, B.
Vincent, P.
Seyffert, A.
Davies, J.
Davids, I. D.
Prokhorov, D.
Marti'i-Devesa, G.
Baghmanyan, V.
Fichet de Clairfontaine, G.
Katz, U.
Konno, R.
Senniappan, M.
Zargaryan, D.
Bulik, T.
Marcowith, A.
Curlo, M.
Puehlhofer, G.
Donath, A.
Armand, C.
Komin, N.
Noel, Angel
Reimer, A.
Egberts, K.
White, R.
Fontaine, G.
Chen, A.
Steenkamp, R.
O'Brien, P.
Gabici, S.
van der Walt, J.
Huber, D.
Kostunin, D.
Meintjes, P.
Yusafzai, A.
Montanari, A.
Moore, C.
Khangulyan, D.
Venter, C.
Żywucka, N.
Ernenwein, J. P.
Du Plessis, L.
Bi, B.
Shiningayamwe, K.
Lamanna, G.
Tavernier, T.
Hinton, J.
Lemoine-Goumard, M.
Moulin, E.
Watson, J. J.
Lohse, T.
Leuschner, F.
Malyshev, D.
Veh, J.
Zech, A.
Katarzynski, K.
Steinmassl, S.
Romoli, C.
Tuffs, R.
Bony (de), M.
Böttcher, M.
Giavitto, G.
Spir-Jacob, M.
Thiersen, H.
Einecke, S.
Zmija, A.
Barnacka, Anna
Joshi, V.
Barbosa Martins, V.
Zdziarski, A.
Holch, T.
Batzofin, R.
Majumdar, J.
Damascene Mbarubucyeye, J.
Meyer, M.
Lypova, I.
Moderski, R.
Santangelo, A.
Schwanke, U.
Völk, H. J.
Fiasson, A.
Zanin, R.
Brose, R.
Specovius, A.
Jamrozy, Marek
Murach, T.
Khelifi, B.
Tsuji, N.
Devin, J.
Hermann, G.
Thorpe-Morgan, C.
Vasileiadis, G.
Sun, L.
Ohm, S.
Bernlöhr, K.
van Soelen, B.
Huang, Z.
Dreyer, L.
Kreter, M.
Werner, F.
Becherini, Y.
Zhu, S.
Schutte, H.
Rueda Ricarte, H.
Doroshenko, V.
Lemiere, A.
Le Stum, S.
Hattingh, S.
Gallant, Y.
Kosack, K.
Barnard, M.
Takahashi, T.
Lenain, J. P.
Bylund, T.
Chand, T. B.
Berge, D.
Marchegiani, P.
Mares, A.
Marx, R.
Duffy, C.
Parsons, D.
Pita, S.
Ashkar, H.
Peron, G.
Prokoph, H.
Tomankova, L.
Punch, M.
Tsirou, M.
Spencer, S. T.
Horns, D.
Uchiyama, Y.
Boisson, C.
Wong, Y. W.
Ait-Benkhali, F.
Cangemi, F.
Kundu, A.
Zacharias, M.
Morris, P.
Djannati-Ataï, A.
Niemiec, J.
Mitchell, A.
Armstrong, T.
Giunti, L.
Panter, M.
Salzmann, H.
Kasai, E.
Wierzcholska, Alicja
Olivera-Nieto, L.
Fegan, S.
Abdalla, H.
Rudak, B.
Stawarz, Łukasz
Glawion, D.
Sinha, A.
Kluzniak, W.
Hofmann, W.
Panny, S.
Brun, F.
Cotter, G.
Marandon, V.
Chambery, P.
Breuhaus, M.
Mackey, J.
Fuessling, M.
Luashvili, A.
Tanaka, T.
Sailer, S.
Wagner, S.
Anguener, O.
Zouari, S.
Dmytriiev, A.
Shapopi, J. N. S.
Aharonian, F.
van Eldik, C.
Catalano, J.
Glicenstein, J. F.
Simoni, R.
Terrier, R.
Muller, J.
Feijen, K.
Bolmont, J.
Sanchez, D.
Sasaki, M.
Stegmann, C.
Maurin, G.
Reimer, O.
Nakashima, K.
Steppa, C.
Taylor, A.
Spackman, H.
Dalgleish, H.
Reichherzer, P.
Davids, H.
Sahakian, V.
Levy, C.
Rowell, G.
Hoischen, C.
Ruiz Velasco, E.
Ostrowski, Michał
Hörbe, M.
Ona-Wilhelmi (de), E.
van Rensburg, C.
Schaefer, J.
Casanova, S.
Jung-Richardt, I.
Naurois (de), M.
Quirrenbach, A.
Backes, M.
Schüssler, F.
Grondin, M. H.
Arcaro, C.
Tluczykont, M.
Jankowsky, F.
Bernloehr, K.
Kukec Mezek, G.
Vink, J.
Frans, L.
Klepser, S.
Caroff, S.
Sol, H.
Yassin, H.
Remy, Q.
Rieger, F.
Haupt, M.
Poireau, V.
Oberholzer, L. L.
Mohrmann, L.
Opis:
In October 2019 the central 28 m telescope of the H.E.S.S. experiment has been upgraded with a new camera. The camera is based on the FlashCam design which has been developed in view of a possible future implementation in the medium-sized telescopes of the Cherenkov Telescope Array (CTA). We report here on the results of the science verification program that has been performed after commissioning of the new camera, to show that the camera and software pipelines are working up to expectations.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Is PKS 0625-354 another variable TeV active galactic nucleus?
Autorzy:
Holler, M.
Nayerhoda, A.
Funk, S.
Renaud, M.
Reville, B.
Vincent, P.
Seyffert, A.
Davies, J.
Davids, I. D.
Prokhorov, D.
Marti'i-Devesa, G.
Baghmanyan, V.
Fichet de Clairfontaine, G.
Katz, U.
Konno, R.
Senniappan, M.
Zargaryan, D.
Bulik, T.
Marcowith, A.
Curlo, M.
Donath, A.
Puehlhofer, G.
Armand, C.
Komin, N.
Noel, Angel
Reimer, A.
Egberts, K.
White, R.
Fontaine, G.
Chen, A.
Steenkamp, R.
O'Brien, P.
Gabici, S.
van der Walt, J.
Huber, D.
Kostunin, D.
Meintjes, P.
Yusafzai, A.
Montanari, A.
Moore, C.
Khangulyan, D.
Venter, C.
Żywucka, N.
Ernenwein, J. P.
Du Plessis, L.
Bi, B.
Shiningayamwe, K.
Lamanna, G.
Tavernier, T.
Hinton, J.
Lemoine-Goumard, M.
Moulin, E.
Watson, J. J.
Lohse, T.
Leuschner, F.
Malyshev, D.
Veh, J.
Zech, A.
Katarzynski, K.
Steinmassl, S.
Romoli, C.
Tuffs, R.
Bony (de), M.
Böttcher, M.
Giavitto, G.
Spir-Jacob, M.
Thiersen, H.
Einecke, S.
Zmija, A.
Barnacka, Anna
Joshi, V.
Barbosa Martins, V.
Zdziarski, A.
Holch, T.
Batzofin, R.
Majumdar, J.
Damascene Mbarubucyeye, J.
Meyer, M.
Lypova, I.
Moderski, R.
Santangelo, A.
Schwanke, U.
Völk, H. J.
Fiasson, A.
Zanin, R.
Brose, R.
Specovius, A.
Jamrozy, Marek
Murach, T.
Khelifi, B.
Tsuji, N.
Devin, J.
Hermann, G.
Thorpe-Morgan, C.
Vasileiadis, G.
Sun, L.
Ohm, S.
van Soelen, B.
Huang, Z.
Dreyer, L.
Kreter, M.
Jung, I.
Werner, F.
Becherini, Y.
Zhu, S.
Schutte, H.
Rueda Ricarte, H.
Doroshenko, V.
Lemiere, A.
Le Stum, S.
Hattingh, S.
Gallant, Y.
Kosack, K.
Barnard, M.
Takahashi, T.
Lenain, J. P.
Bylund, T.
Chand, T. B.
Berge, D.
Marchegiani, P.
Mares, A.
Marx, R.
Duffy, C.
Parsons, D.
Pita, S.
Ashkar, H.
Peron, G.
Prokoph, H.
Tomankova, L.
Punch, M.
Tsirou, M.
Spencer, S. T.
Horns, D.
Uchiyama, Y.
Boisson, C.
Wong, Y. W.
Ait-Benkhali, F.
Cangemi, F.
Kundu, A.
Zacharias, M.
Morris, P.
Djannati-Ataï, A.
Niemiec, J.
Armstrong, T.
Giunti, L.
Mitchell, A.
Panter, M.
Salzmann, H.
Kasai, E.
Wierzcholska, Alicja
Olivera-Nieto, L.
Fegan, S.
Abdalla, H.
Rudak, B.
Stawarz, Łukasz
Glawion, D.
Sinha, A.
Kluzniak, W.
Hofmann, W.
Panny, S.
Brun, F.
Cotter, G.
Marandon, V.
Chambery, P.
Breuhaus, M.
Mackey, J.
Fuessling, M.
Luashvili, A.
Tanaka, T.
Sailer, S.
Wagner, S.
Anguener, O.
Zouari, S.
Dmytriiev, A.
Shapopi, J. N. S.
Aharonian, F.
van Eldik, C.
Catalano, J.
Glicenstein, J. F.
Simoni, R.
Terrier, R.
Muller, J.
Feijen, K.
Bolmont, J.
Sanchez, D.
Sasaki, M.
Stegmann, C.
Maurin, G.
Reimer, O.
Nakashima, K.
Steppa, C.
Taylor, A.
Spackman, H.
Dalgleish, H.
Reichherzer, P.
Davids, H.
Sahakian, V.
Levy, C.
Rowell, G.
Hoischen, C.
Ruiz Velasco, E.
Ostrowski, Michał
Hörbe, M.
Ona-Wilhelmi (de), E.
van Rensburg, C.
Schaefer, J.
Casanova, S.
Naurois (de), M.
Quirrenbach, A.
Backes, M.
Schüssler, F.
Grondin, M. H.
Arcaro, C.
Tluczykont, M.
Jankowsky, F.
Bernloehr, K.
Kukec Mezek, G.
Vink, J.
Frans, L.
Klepser, S.
Caroff, S.
Sol, H.
Yassin, H.
Remy, Q.
Rieger, F.
Haupt, M.
Poireau, V.
Oberholzer, L. L.
Mohrmann, L.
Opis:
The majority of the active galactic nuclei (AGN) detected at very-high-energies above 100 GeV belong to the class of blazars with a small angle between the jet-axis and the line-of-sight. Only about 10 percent of the gamma-ray AGN are objects with a larger viewing angle resulting in a smaller Doppler boosting of the emission. Originally, it was believed that gamma-ray emission can only be observed from blazars and those are variable in its brightness. Instead, the last years have shown that non-blazar active galaxies also show a fascinating variability behaviour which provide important new insights into the physical processes responsible for the gamma-ray production and especially for flaring events. Here, we report on the observation of gamma-ray variability of the active galaxy PKS 0625−354 detected with the H.E.S.S. telescopes in November 2018. The classification of PKS 0625−354 is a still matter of debate. The H.E.S.S. measurements were performed as part of a flux observing program and showed in the first night of the observation a detection of the object with > 5σ. A denser observation campaign followed for the next nine nights resulting in a decrease of the gamma-ray flux. Those observations were accompanied with Swift in the X-ray and UV/optical band allowing for the reconstruction of a multi-band broad-band spectral energy distribution. We will discuss the implications of the gamma-ray variability of the object.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Deep observations of Keplers SNR with H.E.S.S.
Autorzy:
Holler, M.
Nayerhoda, A.
Funk, S.
Renaud, M.
Reville, B.
Vincent, P.
Seyffert, A.
Davies, J.
Prokhorov, D.
Davids, I. D.
Marti'i-Devesa, G.
Baghmanyan, V.
Fichet de Clairfontaine, G.
Katz, U.
Konno, R.
Senniappan, M.
Zargaryan, D.
Bulik, T.
Marcowith, A.
Curlo, M.
Puehlhofer, G.
Donath, A.
Armand, C.
Komin, N.
Noel, Angel
Reimer, A.
Egberts, K.
White, R.
Fontaine, G.
Chen, A.
Steenkamp, R.
O'Brien, P.
Gabici, S.
van der Walt, J.
Huber, D.
Kostunin, D.
Meintjes, P.
Yusafzai, A.
Montanari, A.
Moore, C.
Khangulyan, D.
Venter, C.
Żywucka, N.
Ernenwein, J. P.
Du Plessis, L.
Bi, B.
Shiningayamwe, K.
Lamanna, G.
Tavernier, T.
Hinton, J.
Lemoine-Goumard, M.
Moulin, E.
Watson, J. J.
Lohse, T.
Leuschner, F.
Malyshev, D.
Veh, J.
Zech, A.
Katarzynski, K.
Steinmassl, S.
Romoli, C.
Tuffs, R.
Bony (de), M.
Böttcher, M.
Giavitto, G.
Spir-Jacob, M.
Thiersen, H.
Einecke, S.
Zmija, A.
Barnacka, Anna
Joshi, V.
Barbosa Martins, V.
Zdziarski, A.
Holch, T.
Batzofin, R.
Majumdar, J.
Damascene Mbarubucyeye, J.
Völk, H. J.
Lypova, I.
Meyer, M.
Moderski, R.
Santangelo, A.
Schwanke, U.
Fiasson, A.
Zanin, R.
Brose, R.
Specovius, A.
Jamrozy, Marek
Murach, T.
Khelifi, B.
Tsuji, N.
Devin, J.
Hermann, G.
Thorpe-Morgan, C.
Vasileiadis, G.
Sun, L.
Ohm, S.
van Soelen, B.
Huang, Z.
Dreyer, L.
Kreter, M.
Jung, I.
Werner, F.
Becherini, Y.
Zhu, S.
Schutte, H.
Rueda Ricarte, H.
Doroshenko, V.
Lemiere, A.
Le Stum, S.
Hattingh, S.
Gallant, Y.
Kosack, K.
Barnard, M.
Takahashi, T.
Lenain, J. P.
Bylund, T.
Chand, T. B.
Berge, D.
Marchegiani, P.
Mares, A.
Marx, R.
Duffy, C.
Parsons, D.
Pita, S.
Ashkar, H.
Peron, G.
Prokoph, H.
Tomankova, L.
Punch, M.
Tsirou, M.
Spencer, S. T.
Horns, D.
Uchiyama, Y.
Boisson, C.
Wong, Y. W.
Ait-Benkhali, F.
Cangemi, F.
Kundu, A.
Zacharias, M.
Morris, P.
Djannati-Ataï, A.
Niemiec, J.
Armstrong, T.
Giunti, L.
Mitchell, A.
Panter, M.
Salzmann, H.
Kasai, E.
Wierzcholska, Alicja
Olivera-Nieto, L.
Fegan, S.
Abdalla, H.
Rudak, B.
Stawarz, Łukasz
Glawion, D.
Sinha, A.
Kluzniak, W.
Hofmann, W.
Panny, S.
Brun, F.
Cotter, G.
Marandon, V.
Chambery, P.
Breuhaus, M.
Mackey, J.
Fuessling, M.
Luashvili, A.
Tanaka, T.
Sailer, S.
Wagner, S.
Anguener, O.
Zouari, S.
Dmytriiev, A.
Shapopi, J. N. S.
Aharonian, F.
van Eldik, C.
Simoni, R.
Catalano, J.
Glicenstein, J. F.
Terrier, R.
Muller, J.
Feijen, K.
Bolmont, J.
Sanchez, D.
Sasaki, M.
Stegmann, C.
Maurin, G.
Reimer, O.
Nakashima, K.
Steppa, C.
Taylor, A.
Spackman, H.
Dalgleish, H.
Reichherzer, P.
Davids, H.
Sahakian, V.
Levy, C.
Rowell, G.
Hoischen, C.
Ruiz Velasco, E.
Ostrowski, Michał
Hörbe, M.
Ona-Wilhelmi (de), E.
van Rensburg, C.
Schaefer, J.
Casanova, S.
Naurois (de), M.
Quirrenbach, A.
Backes, M.
Schüssler, F.
Grondin, M. H.
Arcaro, C.
Tluczykont, M.
Jankowsky, F.
Bernloehr, K.
Kukec Mezek, G.
Vink, J.
Frans, L.
Klepser, S.
Caroff, S.
Sol, H.
Yassin, H.
Remy, Q.
Rieger, F.
Haupt, M.
Poireau, V.
Oberholzer, L. L.
Mohrmann, L.
Opis:
Kepler’s supernova remnant (SNR) which is produced by the most recent naked-eye supernova in our Galaxy is one of the best studied SNRs, but its gamma-ray detection has eluded us so far. Observations with modern imaging atmospheric Cherenkov telescopes (IACT) have enlarged the knowledge about nearby SNRs with ages younger than 500 years by establishing Cassiopeia A and Tycho’s SNRs as very high energy (VHE) gamma-ray sources and setting a lower limit on the distance to Kepler’s SNR. This SNR is significantly more distant than the other two and expected to be one of the faintest gamma-ray sources within reach of the IACT arrays of this generation. We report strong evidence for a VHE signal from Kepler’s SNR based on deep observations of the High Energy Stereoscopic System (H.E.S.S.) with an exposure of 152 hours, including 122 hours accumulated in 2017-2020. We further discuss implications of this result for cosmic-ray acceleration in young SNRs.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies