BeppoSAX observations of Narrow-Line Seyfert 1 galaxies - II. Ionized iron features in Arakelian 564

被引:28
作者
Comastri, A
Stirpe, GM
Vignali, C
Brandt, WN
Leighly, KM
Fiore, F
Guainazzi, M
Matt, G
Nicastro, F
Puchnarewicz, EM
Siemiginowska, A
机构
[1] Osservatorio Astron Bologna, I-40127 Bologna, Italy
[2] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
[3] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA
[4] Columbia Univ, Dept Astron, New York, NY 10027 USA
[5] Osserv Astron Roma, I-00044 Monte Porzio Catone, Italy
[6] SAX, Sci Data Ctr, Nuova Telespazio, I-00131 Rome, Italy
[7] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[8] ESA, VILSPA, XMM Newton SOC, E-28080 Madrid, Spain
[9] Univ Roma Tre, Dipartimetno Fis E Amaldi, I-00146 Rome, Italy
[10] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
来源
ASTRONOMY & ASTROPHYSICS | 2001年 / 365卷 / 03期
关键词
X-rays : galaxies; galaxies : Seyfert; galaxies : individual : Ark 564;
D O I
10.1051/0004-6361:20000152
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The BeppoSAX observations of the bright Narrow-Line Seyfert I galaxy Ark 564 are presented along with a high quality optical spectrum taken at the 1.5 m telescope at La Silla. The 0.1-10 keV X-ray spectrum is characterized by a strong soft; component which is best described by blackbody-like emission with a temperature of similar to 160 eV. At higher energies a steep (Gamma similar or equal to 2.4) power-law tail is present. There is evidence of an ionized reflector in the form of an iron line and edge. We do not find significant evidence of soft X-ray features if the spectrum is modelled with a two component continuum. The optical and X-ray spectral properties support the hypothesis of a high accretion rate onto a low mass black hole.
引用
收藏
页码:400 / 408
页数:9
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