R. Krivonos, S. Tsygankov, A. Lutovinov, M. Revnivtsev, E. Churazov, R. Sunyaev
Context. The INTEGRAL observatory operating in a hard X-ray/gamma domain gathered a large observational data set over nine years since 2003. Dominant fraction of the observing time was dedicated to the Galactic source population study making the possibility of the deepest Galactic survey in hard X-rays ever compiled. Aims. The aim of the current Galactic survey is to make a basis for Galactic source population studies, and perform mapping of the Milky Way in hard X-rays over the maximum exposure available at |b|<17.5 deg. Methods. We used sky reconstruction algorithms specially developed for the high quality imaging of INTEGRAL/IBIS data. Results. We present sky images, sensitivity maps, and catalogs of detected sources in three energy bands: 17-60, 17-35, and 35-80 keV in the Galactic plane at |b|<17.5 deg. The total number of sources in the reference 17-60 keV band includes 402 (392) objects exceeding a 4.7 sigma (5 sigma) detection threshold on the 9-years time-averaged map. Among the identified sources with known and tentatively identified nature, 251 are Galactic objects (107 low-mass X-ray binaries, 81 high-mass X-ray binaries, 35 cataclysmic variables, and 28 of other types) and 111 are extragalactic objects, including 108 active galactic nuclei (AGNs) and 3 galaxy clusters. The sample of Galactic sources with S/N>5 sigma has an identification completeness of ~91%, which is valuable for population studies.
View original:
http://arxiv.org/abs/1205.3941
No comments:
Post a Comment