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25 April 2024 |
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Article overview
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The (re)appearance of NGC 925 ULX-3, a new transient ULX | | Hannah P. Earnshaw
; Marianne Heida
; Murray Brightman
; Felix Fürst
; Fiona A. Harrison
; Amruta Jaodand
; Matthew J. Middleton
; Timothy P. Roberts
; Rajath Sathyaprakash
; Daniel Stern
; Dominic J. Walton
; | | Date: |
2 Jan 2020 | | Abstract: | We report the discovery of a third ULX in NGC 925 (ULX-3), detected in
November 2017 by Chandra at a luminosity of $L_{
m X} =
(7.8pm0.8) imes10^{39}$ 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 January 2017 at a much lower luminosity of
$L_{
m X} = (3.8pm0.5) imes10^{38}$ erg s$^{-1}$. With an additional Chandra
non-detection 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 $Gamma=1.6pm0.1$, whereas the XMM-Newton detection is slightly
softer, with $Gamma=1.8^{+0.2}_{-0.1}$ and also well-fitted with a broadened
disc 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. | | Source: | arXiv, 2001.0642 | | Services: | Forum | Review | PDF | Favorites | |
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