Mid-Infrared and multi-wavelength monitoring of the microquasar GRS 1915+105.

Details Mid-Infrared and multi-wavelength monitoring of the microquasar GRS 1915+105. Mid-Infrared and multi-wavelength monitoring of the microquasar GRS 1915+105.

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20232f&link_type=abstract

Spitzer Proposal ID #20232

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Scientific paper

We propose to continue mid-infrared photometric and spectroscopic observations of the microquasar GRS 1915+105 in the context of a campaign of multi-wavelength observations of the source. GRS 1915+105 is used as a laboratory to understand the accretion / ejection phenomena occurring in stellar-mass accreting black hole (microquasars) and by analogy in supermassive black holes (AGNs). A key question is the nature of the time-variable infrared emission in this system. Depending on the state of the source, we wish to know what is the contribution in the mid-infrared of the different possible emission mechanisms: the thermal emission from the K-M giant donor star, the synchrotron emission from the compact relativistic jets, X-ray reprocessing in the accretion disc and free-free emission from a possible disc-wind. The continuum in a wavelength range as large as possible and the possible emission lines observed thanks to the Infrared Array Camera (IRAC) and the Infrared Spectrograph (IRS) are important clues to achieve this study. These mid-infrared observations will be combined with observations with the RXTE and INTEGRAL satellites in the X-rays and gamma-rays, the ESO/NTT in near-infrared and the VLA/VLBA and Ryle Telescopes in radio. Thanks to these simultaneous multiwavelength observations we will identify the accretion state of the source and determine the contribution of each emission component of the system. As GRS 1915+105 had been rarely observed in the mid-infrared range in the past, the Spitzer Space Telescope brings the unique opportunity to do so, shedding light on the physical mechanisms occurring in this particular binary system and which could apply to the other black hole binaries.

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