NuSTAR Detection of Nonthermal Bremsstrahlung from the Supernova Remnant W49B

被引：11

作者：

Tanaka, Takaaki ^{[1
]}

Yamaguchi, Hiroya ^{[2
]}

Wik, Daniel R. ^{[3
]}

Aharonian, Felix A. ^{[4
,5
,6
]}

Bamba, Aya ^{[7
,8
]}

Castro, Daniel ^{[9
]}

Foster, Adam R. ^{[9
]}

Petre, Robert ^{[10
]}

Rho, Jeonghee ^{[11
,12
]}

Smith, Randall K. ^{[9
]}

Uchida, Hiroyuki ^{[1
]}

Uchiyama, Yasunobu ^{[13
]}

Williams, Brian J. ^{[10
]}

机构：

[1] Kyoto Univ, Dept Phys, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan

[2] JAXA, Inst Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan

[3] Univ Utah, Dept Phys & Astron, 115 South 1400 East, Salt Lake City, UT 84112 USA

[4] Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland

[5] Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany

[6] MEPHI, Kashirskoe Shosse 31, Moscow 115409, Russia

[7] Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[8] Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[9] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[10] NASA, Goddard Space Flight Ctr, Code 662, Greenbelt, MD 20771 USA

[11] SETI Inst, 189 N Bernardo Ave, Mountain View, CA 94043 USA

[12] NASA, Ames Res Ctr, SOFIA Sci Ctr, MS 232, Moffett Field, CA 94035 USA

[13] Rikkyo Univ, Dept Phys, Toshima Ku, 3-34-1 Nishi Ikebukuro, Tokyo 1718501, Japan

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 866卷 / 02期

基金：

日本学术振兴会;

关键词：

acceleration of particles; ISM: individual objects (W49B); ISM: supernova remnants; X-rays: ISM; PARAMETER-ESTIMATION; RAY-EMISSION; GAMMA; ASTRONOMY; DIRECTION; SPECTRUM; IRON; LINE;

D O I：

10.3847/2041-8213/aae709

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on NuSTAR observations of the mixed morphology supernova remnant (SNR) W49B, focusing on its nonthermal emission. Whereas radio observations as well as recent gamma-ray observations evidenced particle acceleration in this SNR, nonthermal X-ray emission has not been reported so far. With the unprecedented sensitivity of NuSTAR in the hard X-ray band, we detect a significant power-law-like component extending up to similar to 20 keV, most probably of nonthermal origin. The newly discovered component has a photon index of Gamma = 1.4(-1.1)(+1.0) with an energy flux between 10 and 20 keV of (3.3 +/- 0.7) x 10(-13) erg cm(-2) s(-1). The emission mechanism is discussed based on the NuSTAR data combined with those in other wavelengths in the literature. The NuSTAR data, in terms both of the spectral slope and of the flux, are best interpreted as nonthermal electron bremsstrahlung. If this scenario is the case, then the NuSTAR emission provides a new probe to sub-relativistic particles accelerated in the SNR.

引用

页数：6

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