SIMBAD references

2017ApJ...835L..30M - Astrophys. J., 835, L30-L30 (2017/February-1)

Astrometric evidence for a population of dislodged AGNs.

MAKAROV V.V., FROUARD J., BERGHEA C.T., REST A., CHAMBERS K.C., KAISER N., KUDRITZKI R.-P. and MAGNIER E.A.

Abstract (from CDS):

We investigate a sample of 2293 ICRF2 extragalactic radio-loud sources with accurate positions determined by VLBI, mostly active galactic nuclei (AGNs) and quasars, which are cross-matched with optical sources in the first Gaia release (Gaia DR1). The distribution of offsets between the VLBI sources and their optical counterparts is strongly non-Gaussian, with powerful wings extending beyond 1 arcsec. Limiting our analysis to only high-confidence difference detections, we find (and publish) a list of 188 objects with normalized variances above 12 and offsets below 1 arcsec. Pan-STARRS stacked and monochromatic images resolve some of these sources, indicating the presence of double sources, confusion sources, or pronounced extended structures. Some 89 high-quality objects, however, do not show any perturbations and appear to be star-like single sources, yet they are displaced by multiples of the expected error from the radio-loud AGN. We conclude that a fraction of luminous AGNs (more than 4%) can be physically dislodged from the optical centers of their parent galaxies.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - galaxies: nuclei - quasars: general - reference systems - reference systems

VizieR on-line data: <Available at CDS (J/ApJ/835/L30): table1.dat>

Simbad objects: 188

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2019.09.21-13:53:57

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