X-ray evolution of the nova V959 Mon suggests a delayed ejection and a non-radiative shock

X-ray evolution of the nova V959 Mon suggests a delayed ejection and a non-radiative shock
复制标题

新星 V959 Mon 的 X 射线演化表明延迟喷射和非辐射冲击

DOI:
10.1093/mnras/staa3367
复制
发表时间:
2020
影响因子:
4.8
通讯作者:
Lopes de Oliveira, Raimundo
Lopes de Oliveira, Raimundo
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Nelson, Thomas;Mukai, Koji;Chomiuk, Laura;Sokoloski, Jennifer L;Linford, Justin D;Finzell, Thomas;Mioduszewski, Amy J;Rupen, Michael P;Weston, Jennifer;Lopes de Oliveira, Raimundo

文献摘要

参考文献

相似文献

对新星中激波气体的X射线观测可以为喷发的动力学提供一个有用的探测器。在这里,我们报告了对新星V959和Mon的X射线观测,这颗新星也是用卫星在GeV伽马射线中探测到的。我们发现,X射线能谱与具有非太阳丰度的双温等离子体模型一致。我们将X射线解释为慢赤道环流和快极流之间的激波相互作用,这些激波作用是从V959的射电观测推断出来的。我们进一步提出,较热的成分,负责大部分的通量,是从驱动到快速流出的反向激波。我们发现,在第60天和140天之间,吸收塔的柱密度出现了系统性的下降,这与对这样一幅图的预期一致。我们提出了有趣的证据,证明喷出物从中央双星排出的过程有大约40天的延迟。此外,我们推断激波前的抛射质量相对较小(几次为10−6M⊙),比从射电观测推断的104K气体的质量低得多。最后,我们推断,在我们观测的时候,占主导地位的X射线激波很可能不是辐射的,并且激波功率比观测到的X射线光度高得多。目前尚不清楚为什么在新星早期从未看到高X射线光度,更接近推断的冲击力,当时冲击波的密度预计足够高,足以产生辐射。
X-ray observations of shocked gas in novae can provide a useful probe of the dynamics of the ejecta. Here we report on X-ray observations of the nova V959 Mon, which was also detected in GeV gamma-rays with theFermisatellite. We find that the X-ray spectra are consistent with a two-temperature plasma model with non-solar abundances. We interpret the X-rays as due to shock interaction between the slow equatorial torus and the fast polar outflow that were inferred from radio observations of V959 Mon. We further propose that the hotter component, responsible for most of the flux, is from the reverse shock driven into the fast outflow. We find a systematic drop in the column density of the absorber between days 60 and 140, consistent with the expectations for such a picture. We present intriguing evidence for a delay of around 40 d in the expulsion of the ejecta from the central binary. Moreover, we infer a relatively small (a few times 10−6M⊙) ejecta mass ahead of the shock, considerably lower than the mass of 104K gas inferred from radio observations. Finally, we infer that the dominant X-ray shock was likely not radiative at the time of our observations, and that the shock power was considerably higher than the observed X-ray luminosity. It is unclear why high X-ray luminosity, closer to the inferred shock power, is never seen in novae at early times, when the shock is expected to have high enough density to be radiative.
V382 Velorum (Nova Velorum 1999) 的早期 X 射线发射:内部冲击模型
DOI: 10.1086/320220
发表时间: 2001
期刊: The Astrophysical Journal
影响因子: --
作者:
K. Mukai;M. Ishida
通讯作者: M. Ishida
γ 射线 Nova V959 Mon 的多历元射电成像
DOI: 10.1093/mnras/stx1087
发表时间: 2017
影响因子: 4.8
作者:
F. Healy;T. O’brien;R. Beswick;A. Avison;M. Argo;M. Argo
通讯作者: M. Argo
DOI: 10.1088/0004-637x/805/2/136
发表时间: 2015-03
期刊: The Astrophysical Journal
影响因子: --
作者:
J. Linford;Valério A. R. M. Ribeiro;Valério A. R. M. Ribeiro;L. Chomiuk;T. Nelson;J. Sokoloski;M. Rupen;K. Mukai;K. Mukai;Tim O'Brien;A. Mioduszewski;J. Weston
通讯作者: J. Linford;Valério A. R. M. Ribeiro;Valério A. R. M. Ribeiro;L. Chomiuk;T. Nelson;J. Sokoloski;M. Rupen;K. Mukai;K. Mukai;Tim O'Brien;A. Mioduszewski;J. Weston
白色 Dncrf 作为 CI 鹿豹座吸积致密星的可能性
DOI: --
发表时间: 2004
期刊: Astrophycical Journal 601
影响因子: --
作者:
Ishida;M.;Morio;K.;Ueda;Y.
通讯作者: Y.
DOI: 10.1088/0004-637x/768/1/49
发表时间: 2013
期刊: The Astrophysical Journal
影响因子: --
作者:
V. Ribeiro;U. Munari;P. Valisa
通讯作者: P. Valisa