Discovery and analysis of a ULX nebula in NGC 3521★

López, KM; Jonker, PG; Heida, M; Torres, MAP; Roberts, TP; Walton, DJ; Moon, D-S; Harrison, FA

doi:10.1093/mnras/stz2127

Discovery and analysis of a ULX nebula in NGC 3521★

López, KM; Jonker, PG; Heida, M; Torres, MAP; Roberts, TP; Walton, DJ; Moon, D-S; Harrison, FA

Authors

KM López

PG Jonker

M Heida

MAP Torres

Professor Tim Roberts t.p.roberts@durham.ac.uk
Professor

DJ Walton

D-S Moon

FA Harrison

Abstract

We present Very Large Telescope/X-shooter and Chandra X-ray observatory/ACIS observations of the ULX [SST2011] J110545.62+000016.2 in the galaxy NGC 3521. The source identified as a candidate near-infrared counterpart to the ULX in our previous study shows an emission line spectrum of numerous recombination and forbidden lines in the visible and near-infrared spectral regime. The emission from the candidate counterpart is spatially extended (∼34 pc) and appears to be connected with an adjacent H II region, located ∼138 pc to the NE. The measured velocities of the emission lines confirm that both the candidate counterpart and H II region reside in NGC 3521. The intensity ratios of the emission lines from the ULX counterpart show that the line emission originates from the combined effect of shock and photoionisation of low metallicity (12 + log (O/H) = 8.19 ± 0.11) gas. Unfortunately, there is no identifiable spectral signature directly related to the photosphere of the mass-donor star in our spectrum. From the archival Chandra data, we derive the X-ray luminosity of the source in the 0.3–7 keV range to be (1.9 ± 0.8) × 1040 erg cm−2 s−1, almost a factor of four higher than what is previously reported.

Citation

López, K., Jonker, P., Heida, M., Torres, M., Roberts, T., Walton, D., …Harrison, F. (2019). Discovery and analysis of a ULX nebula in NGC 3521★. Monthly Notices of the Royal Astronomical Society, 489(1), 1249-1264. https://doi.org/10.1093/mnras/stz2127

Journal Article Type	Article
Acceptance Date	Jul 29, 2019
Online Publication Date	Aug 5, 2019
Publication Date	Oct 31, 2019
Deposit Date	Aug 13, 2019
Publicly Available Date	Aug 13, 2019
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	489
Issue	1
Pages	1249-1264
DOI	https://doi.org/10.1093/mnras/stz2127
Related Public URLs	https://arxiv.org/pdf/1907.12814.pdf

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Copyright Statement
This article has been accepted for publication in the Monthly notices of the Royal Astronomical Society ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.