Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..48p&link_type=abstract
Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 7, 2006, Kavli Institute for Theoretical Physics,
Physics
Scientific paper
An interesting result from the optical study of ultraluminous (i.e. L_x10^39.5 erg/s) variable X-ray sources in nearby galaxies has been the discovery of huge (several hundred pc diameter (!)) bubble-like emission nebulae surrounding these objects. From the measured line widths(corresponding to 100 km/s) and diagnostic emission-line ratios(e.g. [OI]6300/H_alpha > 0.3) we find that these ULX bubbles are young(<10**6 yrs), largely shock-excited structures, although there is also evidence for contribution from (X-ray) photoionisation close to the sources. Using SUBARU, ESO-VLT and HST photometry of the recently identified underlying poor star clusters to which the ULXs belong, stellar isochrones yield cluster ages of some 20-60 Myrs proving that the stellar population is much older than the ULX bubbles. Straightforward application of adiabatic SNR or wind-bubble dynamics, plusan estimate of the interstellar density from the observed recombinationline luminosity of radiative shocks, yields ULX bubble energies of some10^53 erg. This is much larger than the kinetic energy of a single SNR, and more than the superbubble history from the cluster could have possibly provided during its entire lifetime, let alone during the past 10^6 yrs.Taking into account the effects of a clumpy, rather than uniform ISM and of expansion of the shocks into previously excavated stellar wind bubbles, the energy requirements could be lessened by a factor often. This is still much higher than the 10^51 erg kinetic energy of a SN explosion, but is comparable to what has been claimed for "hypernova" remnants. However, inspired by the properties of the famousSS433/W50 system and the largely "dark" "jets" from galactic black hole binaries, I will present evidence for ongoing inflation of ULX bubbles by relativistic jets emanating from the presumed accreting black holes in ULXs.Finally, our optical search for nebula around ULXs that are currently X-ray inactive, or that are possibly beamed away from our line-of-sight, has revealed at least one very large (> 200 pc diameter) [OI]6300 bright, i.e. shock-excited, nebula in the nearby spiral NGC 1313. We willdiscuss these results in the light of current knowledge of past and ongoing energetic input of black-hole binaries into the ISM.
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