The ultraluminous X-ray source HoII X-1: kinematic evidence of its escape from the cluster

Abstract

We analyse the structure and kinematics of ionized gas in the vicinity of the ultraluminous X-ray source (ULX) HoII X-1 in the Holmberg II galaxy using observational data obtained with a scanning Fabry-Perot interferometer in the H$\alpha$, [SII] and [OIII] emission lines at the Russian 6-m telescope. Decomposition of the line profiles allows us to identify the broad component of emission lines caused by the ULX action. We found evidence of an expanding superbubble around the young star cluster located in the studied region. We conclude that the blue-shifted 'arc' around the ULX observed in the line-of-sight velocity field may correspond to a bow shock caused by the ULX movement from that nearby young star cluster. If this interpretation is correct, it will be the first kinematic evidence of ULX's escape from their parent star clusters.

5 pages, 3 figures, submitted to MNRAS Letters after second revision

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Cited by in corpus (11)

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• Scanning Fabry--Perot Interferometer of the 6-m SAO RAS Telescope
• On the contribution of ULXs to stellar feedback: an intermediate mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4
• Optical Counterparts of ULXs in NGC 1672
• On the nature of the ultraluminous X-ray source Holmberg II X-1
• Modelling multiwavelength emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
• Optical Counterparts of ULXs in Two Dwarf Galaxies: NGC 4861 and NGC 4449
• Multi-wavelength spectroscopic analysis of the ULX Holmberg II X-1 and its nebula suggests the presence of a heavy black hole accreting from a B-type donor
• Simultaneous X-ray/UV observations of ultraluminous X-ray source Holmberg II X-1 with Indian space mission AstroSat
• Optical Counterparts of Two Candidate Ultraluminous X-ray Sources in NGC 4536