SIMBAD references

2021MNRAS.503.5485Q - Mon. Not. R. Astron. Soc., 503, 5485-5494 (2021/June-1)

A new candidate pulsating ULX in NGC 7793.


Abstract (from CDS):

We report here the discovery of NGC 7793 ULX-4, a new transient ultraluminous X-ray source (ULX) in NGC 7793, a spiral galaxy already well known for harbouring several ULXs. This new source underwent an outburst in 2012, when it was detected by XMM-Newton and the Swift X-ray telescope. The outburst reached a peak luminosity of 3.4 x 1039 erg s–1 and lasted for about eight months, after which the source went below a luminosity of 1037 erg s–1; previous Chandra observations constrain the low-state luminosity below ∼2 x 1036 erg s–1, implying a variability of at least a factor 1000. We propose four possible optical counterparts, found in archival HST observations of the galaxy. A pulsation in the XMM-Newton signal was found at 2.52 Hz, with a significance of ∼3.4 σ, and an associated spin-up of {dot}f = 3.5×10–8 Hz s–1. NGC 7793 is therefore the first galaxy to host more than one pulsating ULX.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - stars: neutron - X-rays: binaries

Status at CDS : Examining the need for a new acronym.

Simbad objects: 15

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