A T N F    D a i l y    A s t r o n o m y    P i c t u r e

7th of March 2015
Radio properties of the intermediate-mass black hole candidate
by David Cseh (Radboud University Nijmegen, The Netherlands)
HLX-1 is the best candidate intermediate-mass black hole among its peers (Farrell et al. 2009). HLX-1 is the brightest hyperluminous X-ray source with a luminosity reaching 10^42 erg/s at the peak of its outbursts. It is an enigmatic object that lies 95 Mpc away from us and is hosted by the galaxy ESO 243-49. The Swift X-ray light curve of the source shows a Fast Rise Exponential Decay pattern and the spectrum is typically disk-dominated during the outburst. However, at the lowest X-ray luminosities the spectrum changes to be hard, that may indicate a jet- or advection dominated accretion flow. We aimed to study this type of accretion process and observed HLX-1 with the Australia Telescope Compact Array during this low X-ray state. We have detected a radio source with a flux density of 22 microJy (displayed above). The detected emission also suggests (among others) HLX-1 to be in the intermediate-mass range. Our results are published in Cseh et al. (2015).

<<   |   archive   |   about   |   today   *   ATNF   |   Parkes   |   ATCA   |   Mopra   |   VLBI   |   ASKAP   |   >>