Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..797..434s&link_type=abstract
INTERACTING BINARIES: Accretion, Evolution, and Outcomes. AIP Conference Proceedings, Volume 797, pp. 434-441 (2005).
Astronomy and Astrophysics
Astronomy
Pulsars, X-Ray Sources (Astronomical), Galaxies, Star Formation, Brightness, Pulsars, X-Ray Sources, X-Ray Bursts, Starburst Galaxies And Infrared Excess Galaxies, Origin, Formation, Evolution, Age, And Star Formation
Scientific paper
Nearby, (mostly) star-forming galaxies have revealed a number of ultraluminous X-ray sources (ULXs) with super-Eddington luminosities. This contribution discusses the possibility that a fraction of them could be young, Crab-like pulsars, the X-ray luminosity of which is powered by rotation. The pulsar birth parameters estimated from radio pulsar data are used to compute the steady-state pulsar X-ray luminosity distribution as a function of the star formation rate (SFR) in the galaxy. The fraction of sources with Lx >~ 1039 erg/s correlates with the SFR, ranging from ~ 10% in optically dull galaxies, to a few in starbursts galaxies. Furthermore, the X-ray luminosity of a few percents of galaxies is found to be dominated by a single bright pulsar with Lx >~ 1039 erg/s, roughly independently of its SFR. Observational diagnostics that can help distinguish a young pulsar population in ULXs are discussed.
Perna Rosalba
Stella Luigi
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