X-ray Localization of the Globular Cluster G1 with XMM-Newton

Abstract

We present an accurate X-ray position of the massive globular cluster G1 by using XMM-Newton and the Hubble Space Telescope (HST). The X-ray emission of G1 has been detected recently with XMM-Newton. There are two possibilities for the origin of the X-ray emission. It can be either due to accretion of the central intermediate-mass black hole, or by ordinary low-mass X-ray binaries. The precise location of the X-ray emission might distinguish between these two scenarios. By refining the astrometry of the XMM-Newton and HST data, we reduced the XMM-Newton error circle to 1.5". Despite the smaller error circle, the precision is not sufficient to distinguish an intermediate-mass black hole and luminous low-mass X-ray binaries. This result, however, suggests that future Chandra observations may reveal the origin of the X-ray emission.

4 pages, 2 figures; accepted for publication in ApJ

References in corpus (9)

• XMM-Newton observations of the brightest Ultraluminous X-ray sources
• An Intermediate-Mass Black Hole in the Globular Cluster G1: Improved Significance from New Keck and Hubble Space Telescope Observations
• Faint X-ray Sources in the Globular Cluster Terzan 5
• On the weakness of disc models in bright ULXs
• X-rays from the Globular Cluster G1: Intermediate Mass Black Hole or Low Mass X-ray Binary?
• XMM-Newton survey of M 31
• An Unusual Spectral State of an Ultra-luminous Very Soft X-ray Source during Outburst
• Structural Parameters of Mayall II = G1 in M31
• The X-ray source population of the globular cluster M15: Chandra high resolution imaging

Cited by in corpus (16)

• Observational evidence for intermediate-mass black holes
• New Limits on an Intermediate Mass Black Hole in Omega Centauri: I. Hubble Space Telescope Photometry and Proper Motions
• New Limits on an Intermediate Mass Black Hole in Omega Centauri: II. Dynamical Models
• Relativistic Binaries in Globular Clusters
• A population of intermediate-mass black holes in dwarf starburst galaxies up to redshift=1.5
• Limits on intermediate-mass black holes in six Galactic globular clusters with integral-field spectroscopy
• Intermediate Mass Black Hole Formation in compact Young Massive Star Clusters
• Kinematic signature of an intermediate-mass black hole in the globular cluster NGC 6388
• The absence of radio emission from the globular cluster G1
• The M_BH - sigma relation for intermediate-mass black holes in globular clusters
• The outer halo globular cluster system of M31 - III. Relationship to the stellar halo
• Central kinematics of the globular cluster NGC 2808: Upper limit on the mass of an intermediate-mass black hole
• Localization of the X-ray Source in the Globular Cluster G1 with Chandra
• Radio observations of NGC 6388: an upper limit on the mass of its central black hole
• An XMM-Newton Study of the Bright, Nearby Supernova Remnant G296.1-0.5
• HST's hunt for intermediate-mass black holes in star clusters