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- W2783642798 abstract "Prompted by a recent claim by Barrows et al. that X-ray active galactic nuclei (AGNs) are often found significantly offset from the centres of their host galaxies, we have looked for examples of compact radio sources that are offset from the optical centroids of nearby (z < 0.2) galaxies. We have selected a sample of 345 galaxies from the Sloan Digital Sky Survey (SDSS) galaxy catalogue, which have nearby compact radio sources listed in the Cosmic-Lens All Sky Survey (CLASS) catalogue. We find only three matches (|$mathord {sim }0.87$| per cent of the sample) with offsets greater than 600 milliarcsec (mas), which is considerably fewer than we would have expected from the Barrows et al. X-ray survey. We fit our histogram of offsets with a Rayleigh distribution with σ = 60.5 mas, but find that there is an excess of objects with separations greater than |$rm mathord {sim }150 ,mas$|. Assuming that this excess represents AGNs with real offsets, we place an upper limit of |$mathord {sim }17$| per cent on the fraction of offset AGNs in our radio-selected sample. We select 38 objects with offsets greater than 150 mas, and find they have some diverse properties: Some are well known, such as Mrk 273 and Arp 220, some have dust lanes, which may have affected the optical astrometry, and a few are strong new candidates for offset AGNs." @default.
- W2783642798 created "2018-01-26" @default.
- W2783642798 creator A5023510098 @default.
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- W2783642798 date "2018-01-15" @default.
- W2783642798 modified "2023-09-23" @default.
- W2783642798 title "Spatially offset AGN candidates in the CLASS survey" @default.
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- W2783642798 doi "https://doi.org/10.1093/mnras/sty114" @default.
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