تقرير
Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy
| العنوان: | Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy |
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| المؤلفون: | Arnason, R. M., Barmby, P., Bahramian, A., Maccarone, T. J., Zepf, S. E. |
| المصدر: | MNRAS 485 (2019) 2259-2275 |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We present an unprecedented, deep study of the primordial low-mass X-ray binary population in an isolated, lower-metallicity environment. We perform followup observations of previously-identified X-ray binary candidates in the Sculptor Dwarf Galaxy by combining a second Chandra observation with Spitzer and Gemini photometry, as well as Gemini spectroscopy of selected targets. Of the original nine bright X-ray sources identified, we are able to classify all but one as quasars, active galactic nuclei, or background galaxies. We further discover four new X-ray sources in the second-epoch Chandra observation. Three of these new sources are background sources and one is a foreground flaring star. We have found that Sculptor is effectively devoid of X-ray sources above a few 1e34 erg/s. If Sculptor is able to retain primordial binaries at a similar rate to globular clusters, this implies that bright X-ray binaries observed in globular clusters in the present epoch are all formed dynamically. Comment: MNRAS in press; 19 pages, 12 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stz554 |
| URL الوصول: | http://arxiv.org/abs/1902.08635 |
| رقم الأكسشن: | edsarx.1902.08635 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stz554 |
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