J1110+4817 -- a compact symmetric object candidate revisited
arXiv:2006.05144 · doi:10.1093/mnras/staa1669
Abstract
Compact symmetric objects (CSOs) are radio-emitting active galactic nuclei (AGNs) typically with a double-lobed radio structure confined to within 1 kpc. CSOs represent the earliest evolutionary phase of jetted AGNs. Some of them may eventually evolve into large-scale extended double sources, while others stall within the host galaxy and die out, depending on the longevity of nuclear activity, the jet power, and parameters of the surrounding galactic environment. Studying CSOs is a useful tool for understanding the evolution of the galaxies and the interactions between the jets and the medium of the host galaxy. Based on milliarcsec-resolution imaging observations using very long baseline interferometry (VLBI), it is not always straightforward to distinguish between a compact double-lobed or a core-jet structure. The quasar J1110+4817 was considered a CSO candidate in the literature earlier, but because of the lack of clear evidence, it could not be securely classified as a CSO. Here we present a comprehensive analysis of archival multi-frequency VLBI observations combined with accurate Gaia optical astrometric information. Lower-frequency VLBI images reveal an extended radio feature nearly perpendicular to the main structural axis of the source, apparently emanating from the brighter northern feature, that is rare among the known CSOs. While the presence of a binary AGN system cannot be fully excluded, the most plausible explanation is that J1110+4817 is a CSO.
8 pages, 4 figures; accepted for publication in the Monthly Notices of the Royal Astronomical Society
References in corpus (14)
- The Gaia mission
- CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
- A Compact Supermassive Binary Black Hole System
- The VLBA Imaging and Polarimetry Survey at 5 GHz
- The Dynamic Evolution of Young Extragalactic Radio Sources
- A close-pair binary in a distant triple supermassive black-hole system
- VLBI-Gaia offsets favor parsec-scale jet direction in Active Galactic Nuclei
- Constraining the Orbit of Supermassive Black Hole Binary 0402+379
- VLBA images of High Frequency Peakers
- Evidence from the Very Long Baseline Array that J1502SE/SW are Double Hotspots, not a Supermassive Binary Black Hole
- Radio spectra of bright compact sources at z>4.5
- A shrinking Compact Symmetric Object: J11584+2450?
- VLBA 24 and 43 GHz observations of massive binary black hole candidate PKS 1155+251
- Multi-epoch VLBA observations of radio galaxy 0932+075: is this a compact symmetric object?