Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-13
Astrophys.J. 505 (1998) 129
Astronomy and Astrophysics
Astrophysics
16 pages, 6 figures, requires AAS Latex macro v4.0, to appear in The Astrophysical Journal, text and figures also available at
Scientific paper
10.1086/306158
We present results of ASCA deep exposure observations of the hardest X-ray source discovered in the ASCA Large Sky Survey (LSS) project, designated as AX J131501+3141. We extract its accurate X-ray spectrum, taking account of the contamination from a nearby soft source (AX J131502+3142), separated only by 1'. AX J131501+3141 exhibits a large absorption of NH = (6 +4 -2)x 10^22 H/cm^2 with a photon index \Gamma = 1.5 +0.7 -0.6. The 2--10 keV flux was about 5 x 10^-13 erg/s/cm^2 and was time variable by a factor of 30% in 0.5 year. From the highly absorbed X-ray spectrum and the time variability, as well as the results of the optical follow-up observations (Akiyama et al. 1998, astro-ph/9801173), we conclude that AX J131501+3141 is a type 2 Seyfert galaxy. Discovery of such a low flux and highly absorbed X-ray source could have a significant impact on the origin of the cosmic X-ray background.
Akiyama Masayuki
Awaki Hisamitsu
Koyama Katsuji
Ohta Kouji
Sakano Masaaki
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