Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 448, Issue 2, Pages 1153-1161Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv028
Keywords
accretion, accretion discs; galaxies: individual: NGC 55; X-rays: binaries; X-rays: galaxies; X-rays: individuals: NGC 55 ULX1; X-rays: individuals: XMMU J001528.9-391319
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Funding
- INAF [PRIN-2011-1]
- ASI/INAF [I/004/11/0, I/037/12/0]
- Fulbright Research Scholar grant
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NGC 55 ULX1 is a bright Ultraluminous X-ray source located 1.78 Mpc away. We analysed a sample of 20 Swift observations, taken between 2013 April and August, and two Chandra observations taken in 2001 September and 2004 June. We found only marginal hints of a limited number of dips in the light curve, previously reported to occur in this source, although the uncertainties due to the low counting statistics of the data are large. The Chandra and Swift spectra showed clearly spectral variability which resembles those observed in other ULXs. We can account for this spectral variability in terms of changes in both the normalization and intrinsic column density of a two-component model consisting of a blackbody (for the soft component) and a multicolour accretion disc (for the hard component). We discuss the possibility that strong outflows ejected by the disc are in part responsible for such spectral changes.
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