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arXiv 1004.3032astro-ph.HE
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GRS 1915+105 I.采用RXTE、INTEGRAL和Spitzer的高能和中红外聚焦

Long-term multi-wavelength studies of GRS 1915+105 I. A high-energy and mid-infrared focus with RXTE, INTEGRAL, and Spitzer

F. Rahoui, S. Chaty, J. Rodriguez, Y. Fuchs, I. F. Mirabel, G. G. Pooley

摘要:

迄今为止,银河系黑洞双星的中红外特性几乎没有在多波长运动的框架下进行过研究。然而,在这个光谱域的研究是至关重要的,以获得补充信息的存在下的灰尘和/或物理过程,如灰尘加热和热韧致辐射。在这里,我们报告了对微类星体GRS 1915+105的长期多波长研究。一方面,我们的目标是了解中红外发射的起源,另一方面,寻找与高能和/或射电活动的相关性。我们在2004年和2006年之间的几个时期观察到的源与光度计IRAC和光谱仪IRS,都安装在斯皮策太空望远镜。当可用时,我们完成了我们的数据集与准同时RXTE和INTEGRAL高能和/或赖尔射电观测从公共档案。通过光谱分析和射电-X射线光谱能量分布的宽带拟合,研究了GRS 1915+105的中红外环境和活动。我们在GRS 1915+105的所有IRS光谱中检测到多环芳烃分子,但只有一个IRS光谱明确证明了尘埃成分的存在,可能是由高能发射光电离的。我们还认为,这种尘埃分布在一个由伴星加热的盘状结构中,就像在一些赫比格Ae/Be和孤立的冷巨星中观察到的那样。此外,我们表明,一些软X射线发射的吸积盘的内部区域发出的再处理和热化的外部。这导致中红外过量,这很可能与软X射线发射相关。我们排除热韧致辐射的贡献显着在这个光谱域。

英文摘要:

To date, mid-infrared properties of Galactic black hole binaries have barely been investigated in the framework of multi-wavelength campaigns. Yet, studies in this spectral domain are crucial to get complementary information on the presence of dust and/or on the physical processes such as dust heating and thermal bremsstrahlung. Here, we report a long-term multi-wavelength study of the microquasar GRS 1915+105. On the one hand, we aimed at understanding the origins of the mid-infrared emission, and on the other hand, at searching for correlation with the high-energy and/or radio activities. We observed the source at several epochs between 2004 and 2006 with the photometer IRAC and spectrometer IRS, both mounted on the Spitzer Space Telescope. When available, we completed our set of data with quasi-simultaneous RXTE and INTEGRAL high-energy and/or Ryle radio observations from public archives. We then studied the mid-infrared environment and activities of GRS 1915+105 through spectral analysis and broad band fitting of its radio to X-ray spectral energy distributions. We detected polycyclic aromatic hydrocarbon molecules in all but one IRS spectra of GRS 1915+105 which unambiguously proves the presence of a dust component, likely photoionised by the high-energy emission. We also argue that this dust is distributed in a disc-like structure heated by the companion star, as observed in some Herbig Ae/Be and isolated cool giant stars. Moreover, we show that some of the soft X-ray emission emanating from the inner regions of the accretion disc is reprocessed and thermalised in the outer part. This leads to a mid-infrared excess that is very likely correlated to the soft X-ray emission. We exclude thermal bremsstrahlung as contributing significantly in this spectral domain.

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