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http://hdl.handle.net/20.500.12386/32092
Title: | A new candidate pulsating ULX in NGC 7793 | Authors: | Erwan Quintin Natalie Webb Andrés Gúrpide BACHETTI, Matteo Felix Fürst |
Issue Date: | 2021 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 503 | Issue: | 4 | First Page: | 5485 | Abstract: | 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 \textit{XMM-Newton} and the \textit{Swift} X-ray telescope. The outburst reached a peak luminosity of 3.4$\times 10^{39}$ erg\ s$^{-1}$ and lasted for about 8 months, after which the source went below a luminosity of $10^{37}$ erg\ s$^{-1}$; previous \textit{Chandra} observations constrain the low-state luminosity below $\sim$ 2$\times 10^{36}$ 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 \textit{XMM-Newton} signal was found at 2.52 Hz, with a significance of $\sim3.4\,\sigma$, and an associated spin-up of $\dot{f} = 3.5\times10^{-8}$ Hz.s$^{-1}$. NGC 7793 is therefore the first galaxy to host more than one pulsating ULX. | URI: | http://hdl.handle.net/20.500.12386/32092 | URL: | http://arxiv.org/abs/2103.11650v1 https://academic.oup.com/mnras/article-abstract/503/4/5485/6179878?redirectedFrom=fulltext&login=false |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab814 | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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