The Local Environment of Ultraluminous X-ray Sources Viewed by XMM Newton's Optical Monitor
arXiv:1403.2758 · doi:10.1088/0004-637X/776/2/100
Abstract
We have used XMM-Newton's Optical Monitor (OM) images to study the local environment of a sample of 27 Ultraluminous X-ray Sources (ULXs) in nearby galaxies. UVW1 fluxes were extracted from 100 pc regions centered on the ULX positions. We find that at least 4 ULXs (out of 10 published) have spectral types that are consistent with previous literature values. In addition the colors are similar to those of young stars. For the highest-luminosity ULXs, the UVW1 fluxes may have an important contribution from the accretion disk. We find that the majority of ULXs are associated with recent star-formation. Many of the ULXs in our sample are located inside young OB associations or star-forming regions (SFRs). Based on their colors, we estimated ages and masses for star-forming regions located within 1 kpc from the ULXs in our sample. The resolution of the OM was insufficient to detect young dense super-clusters, but some of these star-forming regions are massive enough to contain such clusters. Only three ULXs have no associated SFRs younger than 50 Myr. The age and mass estimates for clusters were used to test runaway scenarios. The data are in general compatible with stellar-mass binaries accreting at super-Eddington rates and ejected by natal kicks. We also tested the hypothesis that ULXs are sub-Eddington accreting IMBHs ejected by three-body interactions, however this is not supported well by the data.
Published in ApJ; 46 pages, 12 figures
References in corpus (17)
- Investigating stellar-mass black hole kicks
- Gravitational Wave Recoil and the Retention of Intermediate Mass Black Holes
- Low metallicity and ultra-luminous X-ray sources in the Cartwheel galaxy
- A 62 Day X-Ray Periodicity and an X-Ray Flare from the Ultraluminous X-Ray Source in M82
- Distribution of High-Mass X-ray Binaries in the Milky Way
- Optical emission from massive donors in ULX binary systems
- Testing the Paradigm that Ultraluminous X-ray Sources as a Class Represent Accreting Intermediate-Mass Black Holes
- Optical Counterparts of Ultra-Luminous X-ray Sources identified from Archival Hubble Space Telescope/WFPC2
- Optical Properties of the Ultraluminous X-ray Source Holmberg IX X-1 and its Stellar Environment
- A ULX microquasar in NGC 5408?
- New Hubble Space Telescope imaging of the counterparts to six ultraluminous X-ray sources
- Confirmation of the 62 Day X-Ray Periodicity from M82
- Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X-ray Sources in M51
- Elemental Abundances of Nearby Galaxies through High Signal-to-Noise XMM-Newton Observations of ULXs
- OMCat: Catalogue of Serendipitous Sources Detected with the XMM-Newton Optical Monitor
- Chandra Observations of the Collisional Ring Galaxy NGC 922
- Infrared Counterparts to Chandra X-Ray Sources in the Antennae