2013A&A...559A.124M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:40:06

2013A&A...559A.124M - Astronomy and Astrophysics, volume 559A, 124-124 (2013/11-1)

A disrupted bulgeless satellite galaxy as counterpart of the ultraluminous X-ray source ESO 243-49 HLX-1.

MAPELLI M., ANNIBALI F., ZAMPIERI L. and SORIA R.

Abstract (from CDS):

The point-like X-ray source HLX-1, close to the S0 galaxy ESO 243-49, is one the strongest intermediate-mass black hole candidates, but the nature of its counterpart is still puzzling. By means of N-body/smoothed particle hydrodynamics simulations, we investigate the hypothesis that the HLX-1 counterpart is the nucleus of a bulgeless satellite galaxy, which undergoes a minor merger with the S0 galaxy. We derived synthetic surface brightness profiles for the simulated counterpart of HLX-1 in six Hubble Space Telescope (HST) filters, ranging from far ultraviolet (FUV) to infrared wavelengths, and we compared them with the observed profiles. Our model matches the emission associated with the HLX-1 counterpart in all considered filters, including the bluer ones, even without requiring the contribution of an irradiated disc. The simulation can also account for an extended FUV emission, which is hinted at by the analysis of the F140LP HST filter. This matching is impossible to achieve by assuming either a bulgy satellite, a young star cluster, or an irradiated disc component.

Abstract Copyright:

Journal keyword(s): galaxies: interactions - methods: numerical - galaxies: individual: ESO 243-49 - X-rays: individuals: HLX-1

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 2877 ClG 01 09 49.3 -45 54 02           ~ 137 2
2 ESO 243-49 GiG 01 10 27.746 -46 04 27.41 16.54 14.92   13.48   ~ 151 0
3 [FWB2009] HLX-1 ULX 01 10 28.30 -46 04 22.3     24.5 23.80   ~ 155 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:40:06

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