SIMBAD references

2020ApJ...891..153E - Astrophys. J., 891, 153-153 (2020/March-2)

The (re)appearance of NGC 925 ULX-3, a new transient ULX.

EARNSHAW H.P., HEIDA M., BRIGHTMAN M., FURST F., HARRISON F.A., JAODAND A., MIDDLETON M.J., ROBERTS T.P., SATHYAPRAKASH R., STERN D. and WALTON D.J.

Abstract (from CDS):

We report the discovery of a third ULX in NGC 925 (ULX-3), detected in 2017 November by Chandra at a luminosity of LX = (7.8 ± 0.8) x 1039 erg s–1. Examination of archival data for NGC 925 reveals that ULX-3 was detected by Swift at a similarly high luminosity in 2011, as well as by XMM-Newton in 2017 January at a much lower luminosity of LX = (3.8 ± 0.5) x 1038 erg s–1. With an additional Chandra nondetection in 2005, this object demonstrates a high dynamic range of flux of factor >=26. In its high-luminosity detections, ULX-3 exhibits a hard power-law spectrum with Γ = 1.6 ± 0.1, whereas the XMM-Newton detection is slightly softer, with Γ=1.8–0.1+0.2, and is also well-fitted with a broadened disk model. The long-term light curve is sparsely covered and could be consistent either with the propeller effect or with a large-amplitude superorbital period, both of which are seen in ULXs, in particular those with neutron star accretors. Further systematic monitoring of ULX-3 will allow us to determine the mechanism by which ULX-3 undergoes its extreme variability and to better understand the accretion processes of ULXs.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Accretion - Neutron stars - X-ray binary stars - Light curves - Black holes - X-ray transient sources

Nomenclature: [EHB2020] NGC 925 ULX-3 N=1.

Simbad objects: 6

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2023.02.01-10:38:03

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