X-ray spectral states and metallicity in the ultraluminous X-ray sources NGC 1313 X-1 and X-2

Abstract

We present a systematic analysis of the X-ray spectra of NGC 1313 X-1 and NGC 1313 X-2, using three years of XMM-Newton observations. We fitted the continuum with a Comptonization model plus a multicolor blackbody disc, that describes the effects of an accretion disc plus a corona. We checked the consistency of this spectral model on the basis of the variability patterns of its spectral parameters. We found that the two sources show different spectral states. We tentatively interpret the observed behaviour of NGC 1313 X-1 and X-2 within the framework of near Eddington and/or super-Eddington accretion. We also attempted to determine the chemical abundances in the local environment of NGC 1313 X-1 and X-2 from the EPIC and RGS spectra. The results appear to indicate subsolar metallicity for both sources.

Accepted for pubblication in MNRAS. The paper contains 5 figures and 4 tables

References in corpus (13)

• Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
• XMM-Newton observations of the brightest Ultraluminous X-ray sources
• Masses, Beaming and Eddington Ratios in Ultraluminous X-ray Sources
• 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
• Spectral State Transitions of the Ultraluminous X-ray Sources X-1 and X-2 in NGC 1313
• On the weakness of disc models in bright ULXs
• A survey of the Wolf-Rayet population of the barred, spiral galaxy NGC 1313
• Do Ultraluminous X-Ray Sources Exist in Dwarf Galaxies?
• Photon Bubbles and the Vertical Structure of Accretion Disks
• Confirmation of the 62 Day X-Ray Periodicity from M82
• The Orbital Period of the Ultraluminous X-ray Source in M82
• Elemental Abundances of Nearby Galaxies through High Signal-to-Noise XMM-Newton Observations of ULXs

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