TY - JOUR
T1 - Candidate Hα emission and absorption line sources in the Galactic Bulge Survey
AU - Wevers, T.
AU - Jonker, P. G.
AU - Nelemans, G.
AU - Torres, M. A.P.
AU - Groot, P. J.
AU - Steeghs, D.
AU - Maccarone, T. J.
AU - Hynes, R. I.
AU - Heinke, C.
AU - Britt, C.
N1 - Publisher Copyright:
© 2016 The Authors.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - We present a catalogue of candidate Hα emission and absorption line sources and blue objects in the Galactic Bulge Survey (GBS) region.We use a point source catalogue of the GBS fields (two strips of (l × b) = (6° × 1°) centred at b = 1. ° 5 above and below the Galactic Centre), covering the magnitude range 16 ≤ r' ≤ 22.5. We utilize (r' - i', r' - Hα) colour-colour diagrams to select Hα emission and absorption line candidates, and also identify blue objects (compared to field stars) using the r' - i' colour index. We identify 1337 Hα emission line candidates and 336 Hα absorption line candidates. These catalogues likely contain a plethora of sources, ranging from active (binary) stars, early-type emission line objects, cataclysmic variables (CVs) and low-mass X-ray binaries (LMXBs) to background active galactic nuclei (AGN). The 389 blue objects we identify are likely systems containing a compact object, such as CVs, planetary nebulae and LMXBs. Hot subluminous dwarfs (sdO/B stars) are also expected to be found as blue outliers. Cross-matching our outliers with the GBS X-ray catalogue yields 16 sources, including 7 (magnetic) CVs and 1 qLMXB candidate among the emission line candidates and 1 background AGN for the absorption line candidates. One of the blue outliers is a high-state AM CVn system. Spectroscopic observations combined with the multiwavelength coverage of this area, including X-ray, ultraviolet and (time-resolved) optical and infrared observations, can be used to further constrain the nature of individual sources.
AB - We present a catalogue of candidate Hα emission and absorption line sources and blue objects in the Galactic Bulge Survey (GBS) region.We use a point source catalogue of the GBS fields (two strips of (l × b) = (6° × 1°) centred at b = 1. ° 5 above and below the Galactic Centre), covering the magnitude range 16 ≤ r' ≤ 22.5. We utilize (r' - i', r' - Hα) colour-colour diagrams to select Hα emission and absorption line candidates, and also identify blue objects (compared to field stars) using the r' - i' colour index. We identify 1337 Hα emission line candidates and 336 Hα absorption line candidates. These catalogues likely contain a plethora of sources, ranging from active (binary) stars, early-type emission line objects, cataclysmic variables (CVs) and low-mass X-ray binaries (LMXBs) to background active galactic nuclei (AGN). The 389 blue objects we identify are likely systems containing a compact object, such as CVs, planetary nebulae and LMXBs. Hot subluminous dwarfs (sdO/B stars) are also expected to be found as blue outliers. Cross-matching our outliers with the GBS X-ray catalogue yields 16 sources, including 7 (magnetic) CVs and 1 qLMXB candidate among the emission line candidates and 1 background AGN for the absorption line candidates. One of the blue outliers is a high-state AM CVn system. Spectroscopic observations combined with the multiwavelength coverage of this area, including X-ray, ultraviolet and (time-resolved) optical and infrared observations, can be used to further constrain the nature of individual sources.
KW - Be - novae
KW - Binaries: symbiotic
KW - Cataclysmic variables
KW - Galaxies: active
KW - Galaxy: bulge
KW - Stars: emission line
KW - White dwarfs
UR - http://www.scopus.com/inward/record.url?scp=85018274491&partnerID=8YFLogxK
U2 - 10.1093/mnras/stw3123
DO - 10.1093/mnras/stw3123
M3 - Article
AN - SCOPUS:85018274491
SN - 0035-8711
VL - 466
SP - 163
EP - 173
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -