A Radio-selected Black Hole X-Ray Binary Candidate in the Milky Way Globular Cluster M62
MetadataShow full item record
We report the discovery of a candidate stellar-mass black hole in the Milky Way globular cluster M62. We detected the black hole candidate, which we call M62-VLA1, in the core of the cluster using deep radio continuum imaging from the Karl G. Jansky Very Large Array. M62-VLA1 is a faint source with a flux density of 18.7 ± 1.9 μJy at 6.2 GHz and a flat radio spectrum (α = –0.24 ± 0.42, for S ν = να). M62 is the second Milky Way cluster with a candidate stellar-mass black hole; unlike the two candidate black holes previously found in the cluster M22, M62-VLA1 is associated with a Chandra X-ray source, supporting its identification as a black hole X-ray binary. Measurements of its radio and X-ray luminosity, while not simultaneous, place M62-VLA1 squarely on the well-established radio-X-ray correlation for stellar-mass black holes. In archival Hubble Space Telescope imaging, M62-VLA1 is coincident with a star near the lower red giant branch. This possible optical counterpart shows a blue excess, Hα emission, and optical variability. The radio, X-ray, and optical properties of M62-VLA1 are very similar to those for V404 Cyg, one of the best-studied quiescent stellar-mass black holes. We cannot yet rule out alternative scenarios for the radio source, such as a flaring neutron star or background galaxy; future observations are necessary to determine whether M62-VLA1 is indeed an accreting stellar-mass black hole.
© 2013. The American Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
Miller-Jones, James; Strader, J.; Heinke, C.; Maccarone, T.; van den Berg, M.; Knigge, C.; Chomiuk, L.; Noyola, E.; Russell, T.; Seth, A.; Sivakoff, G. (2015)We report the detection of steady radio emission from the known X-ray source X9 in the globular cluster 47 Tuc. With a double-peaked C iv emission line in its ultraviolet spectrum providing a clear signature of accretion, ...
Corbel, S.; Miller-Jones, James; Fender, R.; Gallo, E.; Maccarone, T.; O'brien, T.; Paragi, Z.; Rupen, M.; Rushton, A.; Sabatini, S.; Sivakoff, G.; Strader, J.; Woudt, P. (2014)The universal link between the processes of accretion and ejection leads to the formation of jets and outflows around accreting compact objects. Incoherent synchrotron emission from these outflows can be observed from a ...
Strader, J.; Chomiuk, L.; Maccarone, T.; Miller-Jones, James; Seth, A. (2012)Hundreds of stellar-mass black holes probably form in a typical globular star cluster, with all but one predicted to be ejected through dynamical interactions. Some observational support for this idea is provided by the ...