SIMBAD references

2015ApJ...809..172I - Astrophys. J., 809, 172 (2015/August-3)

CHANG-ES V: nuclear outflow in a Virgo cluster spiral after a tidal disruption event.

IRWIN J.A., HENRIKSEN R.N., KRAUSE M., WANG Q.D., WIEGERT T., MURPHY E.J., HEALD G. and PERLMAN E.

Abstract (from CDS):

We have observed the Virgo Cluster spiral galaxy, NGC 4845, at 1.6 and 6 GHz using the Karl G. Jansky Very Large Array, as part of the Continuum Halos in Nearby Galaxies–an EVLA Survey (CHANG-ES). The source consists of a bright unresolved core with a surrounding weak central disk (1.8 kpc diameter). The core is variable over the 6 month timescale of the CHANG-ES data and has increased by a factor of ≈6 since 1995. The wide bandwidths of CHANG-ES have allowed us to determine the spectral evolution of this core, which peaks between 1.6 and 6 GHz (it is a Gigahertz-peaked spectrum source). We show that the spectral turnover is dominated by synchrotron self-absorption and that the spectral evolution can be explained by adiabatic expansion (outflow), likely in the form of a jet or cone. The CHANG-ES observations serendipitously overlap in time with the hard X-ray light curve obtained by Nikolajuk & Walter (2013), which they interpret as due to a tidal disruption event (TDE) of a super-Jupiter mass object around a 105 M black hole. We outline a standard jet model, provide an explanation for the observed circular polarization, and quantitatively suggest a link between the peak radio and peak X-ray emission via inverse Compton upscattering of the photons emitted by the relativistic electrons. We predict that it should be possible to resolve a young radio jet via VLBI as a result of this nearby TDE.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: N4845 - galaxies: nuclei

Errata: erratum vol. 860, art. 176 (2018)

Simbad objects: 10

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2023.03.26-17:48:47

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