title: Gas cloud G2 can illuminate the black hole population near the galactic center.
abstract: Galactic nuclei are expected to be densely populated with stellar- and intermediate-mass black holes. Exploring this population will have important consequences for the observation prospects of gravitational waves as well as understanding galactic evolution. The gas cloud G2 currently approaching Sgr A* provides an unprecedented opportunity to probe the black hole and neutron star population of the Galactic nucleus. We examine the possibility of a G2-cloud-black-hole encounter and its detectability with current x-ray satellites, such as Chandra and NuSTAR. We find that multiple encounters are likely to occur close to the pericenter, which may be detectable upon favorable circumstances. This opportunity provides an additional important science case for leading x-ray observatories to closely follow G2 on its way to the nucleus.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA. ibartos@phys.columbia.edu
authors.forename: Imre
authors.initials: I
authors.lastname: Bartos
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Haiman
authors.forename: Bence
authors.initials: B
authors.lastname: Kocsis
authors.forename: Szabolcs
authors.initials: S
authors.lastname: Márka