On the radio properties of the intermediate-mass black hole candidate ESO 243-49 HLX-1

Abstract

We present follow-up radio observations of ESO 243-49 HLX-1 from 2012 using the Australia Telescope Compact Array (ATCA) and the Karl G. Jansky Very Large Array (VLA). We report the detection of radio emission at the location of HLX-1 during its hard X-ray state using the ATCA. Assuming that the `Fundamental Plane' of accreting black holes is applicable, we provide an independent estimate of the black hole mass of $M_{\mathrm{BH}}\le 2.8_{-2.1}^{+7.5}\times 10^6$ M${}_{\odot }$ at 90% confidence. However, we argue that the detected radio emission is likely to be Doppler-boosted and our mass estimate is an upper limit. We discuss other possible origins of the radio emission such as being due to a radio nebula, star formation, or later interaction of the flares with the large-scale environment. None of these were found adequate. The VLA observations were carried out during the X-ray outburst. However, no new radio flare was detected, possibly due to a sparse time sampling. The deepest, combined VLA data suggests a variable radio source and we briefly discuss the properties of the previously detected flares and compare them with microquasars and active galactic nuclei.

10 pages, 2 figures, accepted for publication in MNRAS

References in corpus (19)

• Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
• A Supermassive Black Hole in an Ultracompact Dwarf Galaxy
• An actively accreting massive black hole in the dwarf starburst galaxy Henize 2-10
• Masses, Beaming and Eddington Ratios in Ultraluminous X-ray Sources
• Refining the fundamental plane of accreting black holes
• Opening angles, Lorentz factors and confinement of X-ray binary jets
• A Candidate Massive Black Hole in the Low-metallicity Dwarf Galaxy Pair Mrk 709
• Long-term radio variability of AGN: flare characteristics
• Measuring the accretion rate and kinetic luminosity functions of supermassive black holes
• Identification of the X-Ray Thermal Dominant State in an Ultraluminous X-Ray Source in M82
• Radio Emission on Sub-Parsec Scales from the Intermediate-Mass Black Hole in NGC 4395
• A highly polarised radio jet during the 1998 outburst of the black hole transient XTE J1748-288
• Chandra and Swift Follow-up Observations of the Intermediate Mass Black Hole in ESO243-49
• Implications of the delayed 2013 outburst of the ESO 243-49 HLX-1
• HLX-1 may be an SS433 system
• Coupled radio and X-ray emission and evidence for discrete ejecta in the jets of SS 433
• Investigating the mass of the intermediate mass black hole candidate HLX-1 with the SLIMBH model
• Probing the Active Massive Black Hole Candidate in the Center of NGC 404 with VLBI
• Steep-Spectrum Radio Emission from the Low-Mass Active Galactic Nucleus GH 10

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