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25 April 2024 |
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An HI absorption distance to the black hole candidate X-ray binary MAXI J1535-571 | | Jaiverdhan Chauhan
; James C.A. Miller-Jones
; Gemma E. Anderson
; Wasim Raja
; Arash Bahramian
; Aidan Hotan
; Balt Indermuehle
; Matthew Whiting
; James R. Allison
; Craig Anderson
; John Bunton
; Baerbel Koribalski
; Elizabeth Mahony
; | | Date: |
21 May 2019 | | Abstract: | With the Australian Square Kilometre Array Pathfinder (ASKAP) we monitored
the black hole candidate X-ray binary MAXI J1535--571 over seven epochs from 21
September to 2 October 2017. Using ASKAP observations, we studied the HI
absorption spectrum from gas clouds along the line-of-sight and thereby
constrained the distance to the source. The maximum negative radial velocities
measured from the HI absorption spectra for MAXI J1535--571 and an
extragalactic source in the same field of view are $-69pm4$ km s$^{-1}$ and
$-89pm4$ km s$^{-1}$, respectively. This rules out the far kinematic distance
($9.2pm0.2$ kpc), giving a likely value of $4.0pm0.2$ kpc, with a strong
upper limit of the tangent point at $6.6$ kpc. These distance limits indicate
that the peak luminosity of MAXI J1535--571 was $>75$ per cent of the Eddington
luminosity, and shows that the soft-to-hard spectral state transition occurred
at the very low luminosity of 1.2--3.3$ imes10^{-5}$ times the Eddington
luminosity. Finally, this study highlights the capabilities of new wide-field
radio telescopes to probe Galactic transient outbursts, by allowing us to
observe both a target source and a background comparison source in a single
telescope pointing. | | Source: | arXiv, 1905.8497 | | Services: | Forum | Review | PDF | Favorites | |
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