تقرير
The first low-mass black hole X-ray binary identified in quiescence outside of a globular cluster
| العنوان: | The first low-mass black hole X-ray binary identified in quiescence outside of a globular cluster |
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| المؤلفون: | Tetarenko, B. E., Bahramian, A., Arnason, R. M., Miller-Jones, J. C. A., Repetto, S., Heinke, C. O., Maccarone, T. J., Chomiuk, L., Sivakoff, G. R., Strader, J., Kirsten, F., Vlemmings, W. |
| سنة النشر: | 2016 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | The observed relation between the X-ray and radio properties of low-luminosity accreting black holes has enabled the identification of multiple candidate black hole X-ray binaries (BHXBs) in globular clusters. Here we report an identification of the radio source VLA J213002.08+120904 (aka M15 S2), recently reported in Kirsten et al. 2014, as a BHXB candidate. They showed that the parallax of this flat-spectrum variable radio source indicates a 2.2$^{+0.5}_{-0.3}$ kpc distance, which identifies it as lying in the foreground of the globular cluster M15. We determine the radio characteristics of this source, and place a deep limit on the X-ray luminosity of $\sim4\times10^{29}$ erg s$^{-1}$. Furthermore, we astrometrically identify a faint red stellar counterpart in archival Hubble images, with colors consistent with a foreground star; at 2.2 kpc its inferred mass is 0.1-0.2 $M_{\odot}$. We rule out that this object is a pulsar, neutron star X-ray binary, cataclysmic variable, or planetary nebula, concluding that VLA J213002.08+120904 is the first accreting black hole X-ray binary candidate discovered in quiescence outside a globular cluster. Given the relatively small area over which parallax studies of radio sources have been performed, this discovery suggests a much larger population of quiescent BHXBs in our Galaxy, $2.6\times10^4-1.7\times10^8$ BHXBs at $3\sigma$ confidence, than has been previously estimated ($\sim10^2-10^4$) through population synthesis. Comment: 13 pages, 6 Figures, Accepted to ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/0004-637X/825/1/10 |
| URL الوصول: | http://arxiv.org/abs/1605.00270 |
| رقم الأكسشن: | edsarx.1605.00270 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/0004-637X/825/1/10 |
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