Autor: Assis, A. de O. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Proposal of heuristic regression method applied in descriptive data analysis: case studies
Autorzy:: Gomes, F. A.
Assis, A. de O.
Reis, M. R. da C.
Gomes, V. M.
Oliveira, S. G. M.
Araujo, W. R. H. de
Calixto, W. P.
Tematy:: regression
data analysis
optimization
heuristic
modeling; Pokaż więcej
Wydawca:: EEEIC International Barbara Leonowicz Szabłowska
Powiązania:: https://bibliotekanauki.pl/articles/136229.pdf Link otwiera się w nowym oknie
Opis:: The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: H.E.S.S. programme searching for VHE gamma rays associated with FRBs
Autorzy:: Schüssler, F.
Batzofin, R.
Mehta, A.
Holler, M.
Niemiec, J.
Fontaine, G.
Santangelo, A.
Lenain, J.-P.
Aharonian, F.
Kostunin, D.
Ren, H.
de Ona Wilhelmi, E.
Regeard, M.
Khatoon, R.
Kasai, E.
Wierzcholska, Alicja
Takahashi, T.
Sasaki, M.
Spencer, S.
Steppa, C.
Schäfer, J.
Barbosa Martins, V.
Sharma, A.
Punch, M.
Brose, R.
Reimer, O.
Boisson, C.
Casanova, S.
Huang, Zhiqiu
Wach, T.
Bradascio, F.
Katarzyński, K.
Venter, C.
Chibueze, O.
Kluźniak, W.
Bernlöhr, K.
Böttcher, M.
Brun, F.
Panny, S.
Cerruti, M.
Marandon, V.
van Eldik, C.
Borowska, J.
Sabri, K.
Stawarz, Łukasz
Salzmann, H.
Rudak, B.
Bolmont, J.
Kerszberg, D.
Schutte, H.M.
Parsons, R.D.
Escañuela Nieves, C.
Jaitly, A.
de Naurois, M.
Moulin, E.
Kosack, K.
Żywucka-Hejzner, Natalia
Chand, T.
Mitchell, A.
Archaryya, A.
Lang, R.G.
Gabici, S.
Funk, S.
Ravikularaman, S.
Chen, A.
Steinmassl, S.
Olivera-Nieto, L.
Tsirou, M.
Dmytriiev, A.
Heß, B.
Chandra, S.
Ernenwein, J.-P.
Ostrowski, Michał
Moghadam, M.O.
Djannati-Ataï, A.
Kundu, A.
Khélifi, B.
Le Stum, S.
Jamrozy, Marek
Mackey, J.
Moderski, R.
Einecke, S.
O'Brien, P.
Becherini, Y.
Quirrenbach, A.
Aschersleben, J.
Tanaka, T.
Rowell, G.
Damascene Mbarubucyeye, J.
Meyer, M.
Jung-Richardt, I.
Chibueze, J.
Bruno, B.
Lemoine-Goumard, M.
Pensec, U.
Backes, M.
Djuvsland, J.
Vecchi, M.
Filipovic, M.
Horns, D.
Malyshev, D.
Zdziarski, A.A.
Grolleron, G.
Glicenstein, J.F.
Marx, R.
Rieger, F.
Berge, D.
Lemière, A.
de Assis Scarpin, J.
Pühlhofer, G.
Celic, J.
Brown, A.
Ashkar, H.
de Bony de Lavergne, M.
Hofmann, W.
Luashvili, A.
Egberts, K.
Wagner, S.J.
Shapopi, J.N.S.
Panter, M.
Jankowsky, F.
Burger-Scheidlin, C.
Glombitza, J.
Holch, T.L.
Pita, S.
Sahakian, V.
Reville, B.
Zech, A.
Steenkamp, R.
Komin, Nu.
Opis:: Fast Radio Bursts (FRBs) are highly energetic, extremely short-lived bursts of radio flashes. Despite extensive research, the exact cause of these outbursts remains speculative. The high luminosity, short duration, and high dispersion measure of these events suggest they result from extreme, high-energy extragalactic sources, such as highly magnetized and rapidly spinning neutron stars known as magnetars. The number of detected FRBs, including repeating ones, has grown rapidly in recent years. Except for FRB 20200428D, and FRB-like radio burst that is associated to Galactic magnetar SGR 1935+2154, no multi-wavelength counterpart to any FRB has been detected yet. The High Energy Stereoscopic System (H.E.S.S.) telescope has developed a program to follow up FRBs searching for their gamma-ray counterparts, helping to uncover the nature of FRBs and FRB sources. This paper provides an overview of the searches for FRB sources conducted by H.E.S.S., including follow-up observations and simultaneous multi-wavelength campaigns with radio and X-ray observatories. Among the FRB sources observed by H.E.S.S., nine are localized with redshifts ranging between 0.11 and 0.492 from 2015 to 2022. No significant very high energy (VHE) emission was detected during these observations. We report constraints on the VHE luminosity ranging from 10$^{44}$ erg s$^{-1}$ and 10$^{48}$ erg s$^{-1}$, placing limits on the FRB's region persistent VHE emission and potential FRB afterglow emission across timescales from hours to years.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Detection of very high-energy gamma-ray emission from Eta Carinae during its 2020 periastron passage
Autorzy:: Schüssler, F.
Holch, T. L.
Batzofin, R.
Mehta, A.
Holler, M.
Niemiec, J.
Fontaine, G.
Ruiz-Velasco, E.
Santangelo, A.
Lenain, J.-P.
Aharonian, F.
Kostunin, D.
Lang, R. G.
de Ona Wilhelmi, E.
Ren, H.
Streil, K.
Regeard, M.
Ohm, S.
Marcowith, A.
Khatoon, R.
Wierzcholska, Alicja
Sasaki, M.
Spencer, S.
Steppa, C.
Schäfer, J.
Barbosa Martins, V.
Ait Benkhali, F.
Brose, R.
Reimer, O.
Boisson, C.
Casanova, S.
Moghadam, M. O.
Werner, F.
Wach, T.
Bradascio, F.
Katarzyński, K.
Collins, T.
Mohrmann, L.
Venter, C.
Chibueze, O.
Kluźniak, W.
Bernlöhr, K.
Huang, Z.
Böttcher, M.
Brun, F.
Panny, S.
Tluczykont, M.
Cerruti, M.
Marandon, V.
van Eldik, C.
Schutte, H. M.
Sabri, K.
Stawarz, Łukasz
Hinton, J. A.
Salzmann, H.
Martí-Devesa, G.
Rudak, B.
Bolmont, J.
Reimer, A.
Escañuela Nieves, C.
de Naurois, M.
Moulin, E.
Kosack, K.
Żywucka-Hejzner, Natalia
Wagner, S. J.
Feijen, K.
Chand, T.
Mitchell, A.
Gabici, S.
Funk, S.
Ravikularaman, S.
Grondin, M.-H.
Chen, A.
Steinmassl, S.
Olivera-Nieto, L.
Tsirou, M.
Dmytriiev, A.
Heß, B.
Chandra, S.
Ernenwein, J.-P.
Ostrowski, Michał
Jardin-Blicq, A.
Djannati-Ataï, A.
Khélifi, B.
Le Stum, S.
Jamrozy, Marek
Shapopi, J. N. S.
Cotter, G.
Mackey, J.
Moderski, R.
Remy, Q.
Einecke, S.
Becherini, Y.
Quirrenbach, A.
Aschersleben, J.
Tanaka, T.
White, R.
Rowell, G.
Damascene Mbarubucyeye, J.
Jung-Richardt, I.
Chibueze, J.
Bruno, B.
Lemoine-Goumard, M.
Haerer, L.
Pensec, U.
Djuvsland, J.
Vecchi, M.
Filipovic, M.
Horns, D.
Malyshev, D.
Grolleron, G.
Marx, R.
Glicenstein, J. F.
Rieger, F.
Berge, D.
Lemière, A.
Terrier, R.
de Assis Scarpin, J.
Parsons, R. D.
Pühlhofer, G.
Celic, J.
Brown, A.
Ashkar, H.
de Bony de Lavergne, M.
Hofmann, W.
Luashvili, A.
Tsuji, N.
Egberts, K.
Panter, M.
Jankowsky, F.
Burger-Scheidlin, C.
Devin, J.
Sahakian, V.
Zdziarski, A. A.
Reville, B.
Zech, A.
Steenkamp, R.
Zacharias, M.
Komin, Nu.
Opis:: The colliding-wind binary system η Carinae has been identified as a source of high-energy (HE, below ∼100 GeV) and very high-energy (VHE, above ∼100 GeV) gamma rays in the last decade, making it unique among these systems. With its eccentric 5.5-year-long orbit, the periastron passage, during which the stars are separated by only 1–2 au, is an intriguing time interval to probe particle acceleration processes within the system. In this work, we report on an extensive VHE observation campaign that for the first time covers the full periastron passage carried out with the High Energy Stereoscopic System (H.E.S.S.) in its 5-telescope configuration with upgraded cameras. The VHE gamma-ray emission from η Carinae was detected during the periastron passage with a steep spectrum with the spectral index Γ = 3.3 ± 0.2stat ± 0.1syst. Together with previous and follow-up observations, we derive a long-term light curve sampling one full orbit, showing hints of an increase in the VHE flux towards periastron, but no hint of variability during the passage itself. An analysis of contemporaneous Fermi-LAT data shows that the VHE spectrum represents a smooth continuation of the HE spectrum. From modelling the combined spectrum, we conclude that the gamma-ray emission region is located at distances of ∼10–20 au from the centre of mass of the system and that protons are accelerated up to energies of at least several tera-electronvolts inside the system in this phase.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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