The expansion of the forward shock of 1e 0102.2–7219 in x-rays
文献类型：期刊论文
| 作者 | Xi,Long1,2; Gaetz,Terrance J.3; Plucinsky,Paul P.3; Hughes,John P.4; Patnaude,Daniel J.3 |
| 刊名 | The astrophysical journal
 |
| 出版日期 | 2019-03-18 |
| 卷号 | 874期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Ism: supernova remnants Shock waves X-rays: individual (1e 0102.2–7219) X-rays: ism |
| DOI | 10.3847/1538-4357/ab09ea |
| 英文摘要 | Abstract we measure the expansion of the forward shock of the small magellanic cloud supernova remnant 1e 0102.2–7219 in x-rays using chandra x-ray observatory on-axis advanced ccd imaging spectrometer observations from 1999 to 2016. we estimate an expansion rate of 0.025%?±?0.006% yr?1 and a blast wave velocity of ( 1.61 ± 0.37 ) × 10 3 km s ? 1 . assuming partial electron–ion equilibration via coulomb collisions and cooling due to adiabatic expansion, this velocity implies a post-shock electron temperature of 0.84?±?0.20 kev, which is consistent with the estimate of 0.68?±?0.05 kev based on the x-ray spectral analysis. we combine the expansion rate with the blast wave and reverse shock radii to generate a grid of one-dimensional models for a range of ejecta masses ( 2 – 6 m ☉ ) to constrain the explosion energy, age, circumstellar density, swept-up mass, and unshocked-ejecta mass. we find acceptable solutions for a constant-density ambient medium and for an r?2 power-law profile (appropriate for a constant progenitor stellar wind). for the constant-density case, we find an age of ～1700 yr, explosion energies (0.87–2.61)?×?1051 erg, ambient densities 0.85–2.54 amu cm?3, swept-up masses 22 – 66 m ☉ , and unshocked-ejecta masses 0.05 – 0.16 m ☉ . for the power-law density profile, we find an age of ～2600 yr, explosion energies (0.34–1.02)?×?1051 erg, densities 0.22 – 0.66 amu cm ? 3 at the blast wave, swept-up masses 17 – 52 m ☉ , and unshocked-ejecta masses 0.06 – 0.18 m ☉ . assuming that the true explosion energy was (0.5–1.5)?×?1051 erg, ejecta masses 2 – 3.5 m ☉ are favored for the constant-density case and 3 – 6 m ☉ for the power-law case. the unshocked-ejecta mass estimates are comparable to fe masses expected in core-collapse supernovae with progenitor mass 15.0 – 40.0 m ☉ , offering a possible explanation for the lack of fe emission observed in x-rays. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-874-1-AB09EA |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175728 |
| 专题 | 高能物理研究所 |
| 作者单位 | 1.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China longx@ihep.ac.cn 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA; tgaetz@cfa.harvard.edu, pplucinsky@cfa.harvard.edu, dpatnaude@cfa.harvard.edu 4.Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8109, USA; jph@physics.rutgers.edu |
| 推荐引用方式 GB/T 7714 | Xi,Long,Gaetz,Terrance J.,Plucinsky,Paul P.,et al. The expansion of the forward shock of 1e 0102.2–7219 in x-rays[J]. The astrophysical journal,2019,874(1). |
| APA | Xi,Long,Gaetz,Terrance J.,Plucinsky,Paul P.,Hughes,John P.,&Patnaude,Daniel J..(2019).The expansion of the forward shock of 1e 0102.2–7219 in x-rays.The astrophysical journal,874(1). |
| MLA | Xi,Long,et al."The expansion of the forward shock of 1e 0102.2–7219 in x-rays".The astrophysical journal 874.1(2019). |
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