Bibcode
Casares, J.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 473, Issue 4, p.5195-5209
Fecha de publicación:
2
2018
Número de citas
24
Número de citas referidas
23
Descripción
We present a novel strategy to uncover the Galactic population of
quiescent black holes (BHs). This is based on a new concept, the
photometric mass function (PMF), which opens up the possibility of an
efficient identification of dynamical BHs in large fields-of-view. This
exploits the width of the disc H α emission line, combined with
orbital period information. We here show that H α widths can be
recovered using a combination of customized H α filters. By
setting a width cut-off at 2200 km s-1 we are able to cleanly
remove other Galactic populations of H α emitters, including
∼99.9 per cent of cataclysmic variables (CVs). Only short-period
(Porb <2.1 h) eclipsing CVs and AGNs will contaminate the
sample but these can be easily flagged through photometric variability
and, in the latter case, also mid-IR colours. We also describe the
strategy of a deep (r = 22) Galactic plane survey based on the concept
of PMFs: HAWKs, the HAlpha-Width Kilo-deg Survey. We estimate that
∼800 deg2 are required to unveil ∼50 new dynamical
BHs, a three-fold improvement over the known population. For comparison,
a century would be needed to produce an enlarged sample of 50 dynamical
BHs from X-ray transients at the current discovery rate.
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