XMM-Newton observation of the interacting galaxies NGC 1512 and NGC 1510

XMM-Newton observation of the interacting galaxies NGC 1512 and NGC 1510
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相互作用星系 NGC 1512 和 NGC 1510 的 XMM-Newton 观测

DOI:
10.1051/0004-6361/201423775
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发表时间:
2014
影响因子:
6.5
通讯作者:
Koribalski
Koribalski
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kavanagh;Sasaki;Koribalski

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NGC 1512星系正与较小的星系NGC 1510相互作用,并呈现出一种特殊的形态,其特征是两个伸展的臂被浸入一个大小约为NGC 1512光学直径四倍的HI盘中。目的首次利用XMM-Newton对NGC 1512和NGC 1510星系进行了深入的X射线观测,以获得关于相互作用星系系统中X射线源数量和扩散发射的信息。方法通过光谱分析、用贝叶斯方法计算的硬度比、X射线变异性以及与光学、红外、星表的交叉关联,对在XMM-Newton视场中探测到的源进行识别和分类和无线电波长。我们还利用档案SWIFT(X射线)和澳大利亚望远镜紧凑型阵列(无线电)的数据来更好地约束XMM-Newton探测到的源的性质。结果我们在0.2NGC12keV的能量范围内探测到106个源,其中15个位于−1512和NGC1510的D25区域内,至少6个源与扩展臂重合。我们对6个背景物体和6个前景星进行了识别和分类。我们讨论了NGC1512的D25椭圆内的源的性质,它的性质表明它是一个准恒星天体或一个中间的超发光X射线源。考虑到低质量X射线双星和活动星系核的贡献,在NGC1512的D25区域内探测到的高质量X射线双星的数量与以前基于射电、红外光学和UV波长获得的恒星形成率是一致的。在对未分辨的离散源进行校正后,我们探测到了NGC1512内区的漫反射X射线发射,其等离子体温度kT=0.68(0.31−0.87)keV,X射线光度0.3-10keV=1.3×1038erg S-1。
ContextThe galaxy NGC 1512 is interacting with the smaller galaxy NGC 1510 and shows a peculiar morphology, characterised by two extended arms immersed in an HI disc whose size is about four times larger than the optical diameter of NGC 1512.AimsFor the first time we performed a deep X-ray observation of the galaxies NGC 1512 and NGC 1510 withXMM-Newtonto gain information on the population of X-ray sources and diffuse emission in a system of interacting galaxies.MethodsWe identified and classified the sources detected in theXMM-Newtonfield of view by means of spectral analysis, hardness-ratios calculated with a Bayesian method, X-ray variability, and cross-correlations with catalogues in optical, infrared, and radio wavelengths. We also made use of archivalSwift(X-ray) and Australia Telescope Compact Array (radio) data to better constrain the nature of the sources detected withXMM-Newton.ResultsWe detected 106 sources in the energy range of 0.2−12 keV, out of which 15 are located within theD25regions of NGC 1512 and NGC 1510 and at least six sources coincide with the extended arms. We identified and classified six background objects and six foreground stars. We discussed the nature of a source within theD25ellipse of NGC 1512, whose properties indicate a quasi-stellar object or an intermediate ultra-luminous X-ray source. Taking into account the contribution of low-mass X-ray binaries and active galactic nuclei, the number of high-mass X-ray binaries detected within theD25region of NGC 1512 is consistent with the star formation rate obtained in previous works based on radio, infrared optical, and UV wavelengths. We detected diffuse X-ray emission from the interior region of NGC 1512 with a plasma temperature ofkT= 0.68 (0.31−0.87) keV and a 0.3–10 keV X-ray luminosity of 1.3 × 1038erg s-1, after correcting for unresolved discrete sources.
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