Subaru and ESO/VLT Observations of ULX Counterparts and Bubbles

Details Subaru and ESO/VLT Observations of ULX Counterparts and Bubbles Subaru and ESO/VLT Observations of ULX Counterparts and Bubbles

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.4911p&link_type=abstract

American Astronomical Society Meeting 204, #49.11; Bulletin of the American Astronomical Society, Vol. 36, p.750

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new optical observations of ultraluminous X-ray sources in nearby galaxies. Many of the non-obscured ULX are surrounded by large (several hundred parsec diameter) ionized nebulae with bubble-like morphology. Measured supersonic expansion velocities of 80 km/s or more imply formation either by exceedingly energetic supernova explosions, or by continuous inflation over the last 106 years by mildly relativistic jets like in the microquasar SS433 and its radio nebula W50. A census of similar bubbles not being associated with observable X-ray emission can provide important constraints on lifetime and beaming properties of ULX.
Optical counterparts of at least two ULX display the hallmark of X-ray binaries in the form of broad HeII λ 4686 emission which is probably produced in an accretion disk. These detections open the route towards direct determination of the accretor's mass in ULX.

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