Suzaku X-ray spectroscopy of a peculiar hot star in the galactic center region

被引：0

作者：

Hyodo, Yoshiaki ^{[1
]}

Tsujimoto, Masahiro ^{[2
,3
]}

Koyama, Katsuji ^{[1
]}

Nishiyama, Shogo ^{[4
]}

Nagata, Tetsuya ^{[5
]}

Sakon, Itsuki ^{[6
]}

Murakami, Hiroshi ^{[7
]}

Matsumoto, Hironori ^{[1
]}

机构：

[1] Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Kita-shirakawa Oiwake-cho

[2] Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park

[3] Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501

[4] National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588

[5] Department of Astronomy, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Kita-shirakawa Oiwake-cho

[6] Department of Astronomy, School of Science, University of Tokyo, Bunkyo, Tokyo 113-0033

[7] Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229-8510

来源：

Publications of the Astronomical Society of Japan | 2008年 / 60卷 / SPEC. ISS. 1期

关键词：

Galaxy: center; Stars: individual (CXOGC J174645.3-281546; 2XMMp J174645.2-281547); Stars: Wolf-Rayet; X-rays: spectra; X-rays: stars;

D O I：

10.1093/pasj/60.sp1.s173

中图分类号：

学科分类号：

摘要：

We present the results of a Suzaku study of a bright point-like source in the 6.7 keV intensity map of the Galactic center region. We detected an intense Fe XXV 6.7 keV line with an equivalent width of ∼ 1 keV as well as emission lines of highly ionized Ar and Ca from a spectrum obtained by the X-ray Imaging Spectrometer. The overall spectrum is described very well by a heavily absorbed (∼ 2 × 1023 cm-2) thin thermal plasma model with a temperature of 3.8 ± 0.6keV and a luminosity of ∼ 3 × 1034 erg s_1 (2.0-8.0 keV) at 8 kpc. The absorption, temperature, luminosity, and the 6.7 keV line intensity were confirmed with the archived XMM-Newton data. The source has a very red (J - Ks = 8.2 mag) infrared spectral energy distribution (SED), which was fitted by a blackbody emission of ∼ 1000 K attenuated by a visual extinction of ∼ 31 mag. The high plasma temperature and the large X-ray luminosity are consistent with a wind-wind colliding Wolf-Rayet binary. The similarity of the SED to those of the eponymous Quintuplet cluster members suggests that the source is a WC-type source. © 2008. Astronomical Society of Japan.

引用

页码：S173 / S181

页数：8

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