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23 April 2024 |
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Gemini Spectroscopy of Galactic Bulge Sources: A Population of Hidden Accreting Binaries Revealed? | | Jianfeng Wu
; P. G. Jonker
; M. A. P. Torres
; C. T. Britt
; C. B. Johnson
; R. I. Hynes
; S. Greiss
; D. T. H. Steeghs
; T. J. Maccarone
; C. O. Heinke
; T. Wevers
; | | Date: |
9 Jan 2015 | | Abstract: | We present Gemini spectroscopy for 21 candidate optical counterparts to X-ray
sources discovered in the Galactic Bulge Survey (GBS). For the majority of the
21 sources, the optical spectroscopy establishes that they are indeed the
likely counterparts. One of the criteria we used for the identification was the
presence of an Ha emission line. The spectra of several sources revealed an Ha
emission line only after careful subtraction of the F or G stellar spectral
absorption lines. In a sub-class of three of these sources the residual Halpha
emission line is broad (> 400 km/s) which suggests that it is formed in an
accretion disk, whereas in other cases the line width is such that we currently
cannot determine whether the line emission is formed in an active star/binary
or in an accretion disk. GBS source CX377 shows this hidden accretion behaviour
most dramatically. The previously-identified broad Ha emission of this source
is not present in its Gemini spectra taken about 1 year later. However, broad
emission is revealed after subtracting an F6 template star spectrum. The Gemini
spectra of three sources (CX446, CX1004, and CXB2) as well as the presence of
possible eclipses in light curves of these sources suggest that these sources
are accreting binaries viewed under a high inclination. | | Source: | arXiv, 1501.2017 | | Services: | Forum | Review | PDF | Favorites | |
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