First detection of hotspot advance in a Compact Symmetric Object. Evidence for a class of very young extragalactic radio source

Owsianik, Izabela; Conway, J.

doi:10.48550/arxiv.astro-ph/9712062

Cited by 2 publications

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“…It is thought that at least some CSS sources are young AGN that will evolve into larger radio morphologies (Fanti et al 1995;O'Dea 1998;An & Baan 2012;O'Dea & Saikia 2021). This hypothesis is based on very long baseline interferometry (VLBI) observations of powerful CSS sources that show double-lobed radio morphologies analogous to FRIs and FRIIs but on a much smaller scale (Spencer et al 1991;Dallacasa et al 1995), and jet proper motions indicative of a short travel time from the central engine (Owsianik & Conway 1998;Polatidis & Conway 2003;. The young AGN scenario is further supported by CSS sources having host galaxies similar those of larger radio galaxies.…”

Section: Introductionmentioning

confidence: 99%

Compact Steep Spectrum Radio Sources with Enhanced Star Formation Are Smaller Than 10 kpc

Gordon

O’Dea

Baum

et al. 2023

ApJL

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Compact steep spectrum (CSS) radio sources are active galactic nuclei (AGN) that have radio jets propagating only on galactic scales, defined as having projected linear size (LS) of up to 20 kpc. CSS sources are generally hosted by massive early-type galaxies with little ongoing star formation; however, a small fraction are known to have enhanced star formation. Using archival data from the Faint Images of the Radio Sky at Twenty cm survey, the Very Large Array Sky Survey, and the Sloan Digital Sky Survey, we identify a volume-limited sample of 166 CSS sources at z < 0.2 with L 1.4 GHz > 1024 W Hz−1. Comparing the star formation rates and linear sizes of these CSS sources, we find that the ≈14% of CSS sources with specific star formation rates above 0.01 Gyr−1 all have LS < 10 kpc. We discuss the possible mechanisms driving this result, concluding that it is likely the excess star formation in these sources occurred in multiple bursts and ceased prior to the AGN jet being triggered.

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Section: Introductionmentioning

confidence: 99%

Compact Steep Spectrum Radio Sources with Enhanced Star Formation Are Smaller Than 10 kpc

Gordon

O’Dea

Baum

et al. 2023

ApJL

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Small-scale radio jets and tidal disruption events: a theory of high-luminosity compact symmetric objects

Sullivan,

Blandford,

Begelman

et al. 2024

Monthly Notices of the Royal Astronomical Society

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Double lobe radio sources associated with active galactic nuclei represent one of the longest studied groups in radio astronomy. A particular sub-group of double radio sources comprises the compact symmetric objects (CSOs). CSOs are distinguished by their prominent double structure and sub-kpc total size. It has been argued that the vast majority of high-luminosity CSOs (CSO 2s) represent a distinct class of active galactic nuclei with its own morphological structure and life-cycle. In this work, we present theoretical considerations regarding CSO 2s. We develop a semi-analytic evolutionary model, inspired by the results of large-scale numerical simulations of relativistic jets, that reproduces the features of the radio source population. We show that CSO 2s may be generated by finite energy injections and propose stellar tidal disruption events as a possible cause. We find that tidal disruption events of giant branch stars with masses ≳ 1 M⊙ can fuel these sources and discuss possible approaches to confirming this hypothesis. We predict that if the tidal disruption scenario holds, CSO 2s with sizes less than 400 pc should outnumber larger sources by more than a factor of 10. Our results motivate future numerical studies to determine whether the scenarios we consider for fueling and source evolution can explain the observed radio morphologies. Multiwavelength observational campaigns directed at these sources will also provide critical insight into the origins of these objects, their environments, and their lifespans.

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First detection of hotspot advance in a Compact Symmetric Object. Evidence for a class of very young extragalactic radio source

Cited by 2 publications

References 0 publications

Compact Steep Spectrum Radio Sources with Enhanced Star Formation Are Smaller Than 10 kpc

Compact Steep Spectrum Radio Sources with Enhanced Star Formation Are Smaller Than 10 kpc

Small-scale radio jets and tidal disruption events: a theory of high-luminosity compact symmetric objects

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