eBASCS: Disentangling overlapping astronomical sources II, using spatial, spectral, and temporal information
eBASCS: Disentangling overlapping astronomical sources II, using spatial, spectral, and temporal information
复制标题
eBASCS:使用空间、光谱和时间信息解开重叠的天文源 II
DOI:
10.1093/mnras/stab1456
复制
发表时间:
2021
影响因子:
4.8
通讯作者:
Zezas, Andreas
中科院分区:
文献类型:
--
作者:
Meyer, Antoine D;van Dyk, David A;Kashyap, Vinay L;Campos, Luis F;Jones, David E;Siemiginowska, Aneta;Zezas, Andreas
The analysis of individual X-ray sources that appear in a crowded field can easily be compromised by the misallocation of recorded events to their originating sources. Even with a small number of sources, which none the less have overlapping point spread functions, the allocation of events to sources is a complex task that is subject to uncertainty. We develop a Bayesian method designed to sift high-energy photon events from multiple sources with overlapping point spread functions, leveraging the differences in their spatial, spectral, and temporal signatures. The method probabilistically assigns each event to a given source. Such a disentanglement allows more detailed spectral or temporal analysis to focus on the individual component in isolation, free of contamination from other sources or the background. We are also able to compute source parameters of interest like their locations, relative brightness, and background contamination, while accounting for the uncertainty in event assignments. Simulation studies that include event arrival time information demonstrate that the temporal component improves event disambiguation beyond using only spatial and spectral information. The proposed methods correctly allocate up to 65more events than the corresponding algorithms that ignore event arrival time information. We apply our methods to two stellar X-ray binaries, UV Cet and HBC 515 A, observed withChandra. We demonstrate that our methods are capable of removing the contamination due to a strong flare on UV Cet B in its companion ≈40× weaker during that event, and that evidence for spectral variability at times-scales of a few ks can be determined in HBC 515 Aa and HBC 515 Ab.
登录
查看更多内容
DOI:
10.1086/374710
发表时间:
2003
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Audard;M. Güdel;S. Skinner
通讯作者:
S. Skinner
DOI:
10.1088/0004-6256/139/4/1668
发表时间:
2010
期刊:
The Astronomical Journal
影响因子:
--
作者:
B. Reipurth;G. Herbig;C. Aspin
通讯作者:
C. Aspin
影响因子:
6.8
作者:
AKAIKE, H
通讯作者:
AKAIKE, H
DOI:
10.1051/0004-6361/201629545
发表时间:
2016
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
作者:
D. Principe;G. Sacco;J. Kastner;D. Wilner;B. Stelzer;G. Micela
通讯作者:
G. Micela
DOI:
10.1088/0004-637x/796/1/24
发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
作者:
F. Primini;V. Kashyap
通讯作者:
V. Kashyap