Informacja

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

Wyszukujesz frazę "Takeuchi, H" wg kryterium: Wszystkie pola


Tytuł:
Clustering properties of 1.1 mm-selected submillimetre galaxies uncovered by AzTEC deep surveys
Autorzy:
Pollo, Agnieszka
Scott, K. S.
Kohno, K.
Takeuchi, T. T.
Hatsukade, B.
Tamura, Y.
Yun, M. S.
Aretxaga, I.
Austermann, J. E.
Nakanishi, K.
Iono, D.
Hughes, D. H.
Wilson, G. W.
Oshima, T.
Ikarashi, S.
Ezawa, H.
Kawabe, R.
Perera, T.
Williams, C. C.
Wydawca:
Astronomical Society of the Pacific
Opis:
We performed deep and wide-field surveys at 1.1 mm using AzTEC camera mounted on ASTE. We calculate the two-point angular autocorrelation functions in seven deep survey fields: AKARI Deep Field South (ADF-S), COSMOS, GOODS-N, GOODS-S, Lockman Hole East, SSA 22, and SXDF. We detect evidence for clustering signals in all the fields. By averaging the results on the bright sources measured in the ADF-S, the SSA 22, and the SXDF fields, we derived a more significant correlation function of 1.1 mm sources. A comparison of the correlation length with a bias evolution model of dark halos suggests that dark halos hosting bright 1.1 mm sources evolve into galaxy clusters in the present-day universe.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Suzaku observations of the diffuse X-ray emission across the Fermi Bubbles edges
Autorzy:
Tahara, M.
Totani, T.
Cheung, C. C.
Takahashi, Y.
Inoue, Y.
Tsunemi, H.
Kataoka, J.
Nakamori, T.
Stawarz, Łukasz
Takei, Y.
Sofue, Y.
Kimura, M.
Takeuchi, Y.
Opis:
We present Suzaku X-ray observations along two edge regions of the Fermi Bubbles, with eight $ \simeq$ 20 ks pointings across the northern part of the North Polar Spur (NPS) surrounding the north bubble and six across the southernmost edge of the south bubble. After removing compact X-ray features, diffuse X-ray emission is clearly detected and is well reproduced by a three-component spectral model consisting of unabsorbed thermal emission (temperature $\mathit{kT} \simeq$ 0.1 keV) from the Local Bubble, absorbed $\mathit{kT} \simeq$ 0.3 keV thermal emission related to the NPS and/or Galactic halo (GH), and a power-law component at a level consistent with the cosmic X-ray background. The emission measure (EM) of the 0.3 keV plasma decreases by \simeq 50% toward the inner regions of the northeast bubble, with no accompanying temperature change. However, such a jump in the EM is not clearly seen in the south bubble data. While it is unclear whether the NPS originates from a nearby supernova remnant or is related to previous activity within or around the Galactic center, our Suzaku observations provide evidence that suggests the latter scenario. In the latter framework, the presence of a large amount of neutral matter absorbing the X-ray emission as well as the existence of the $\mathit{kT} \simeq$ 0.3 keV gas can be naturally interpreted as a weak shock driven by the bubbles' expansion in the surrounding medium, with velocity $\mathit{v_{exp}} \sim 300 km s^{-1}$ (corresponding to shock Mach number $\mathit{ M } \simeq$), compressing the GH gas to form the NPS feature. We also derived an upper limit for any non-thermal X-ray emission component associated with the bubbles and demonstrate that, in agreement with the aforementioned findings, the non-thermal pressure and energy estimated from a one-zone leptonic model of its broadband spectrum, are in rough equilibrium with that of the surrounding thermal plasma.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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