Jet‑triggered star formation in young radio galaxies
Abstract
Emission in the ultraviolet continuum is a salient signature of the hot, massive and consequently short-lived, stellar population that traces recent or ongoing star formation. With the aim of mapping star forming regions and morphologically separating the generic star formation from that associated with the galaxy-scale jet activity, we obtained high-resolution HST/UV imaging for a sample of nine compact radio sources. Out of these, seven are known Compact Steep Spectrum (CSS) galaxies that host young, kpc-scale radio sources and hence are the best candidates for studying radio-mode feedback on galaxy scales, while the other two form a control sample of larger sources. Extended UV emission regions are observed in six of the seven CSS sources showing close spatial alignment with the radio-jet orientation. If other mechanisms possibly contributing to the observed UV emission are ruled out, this could be evidence in support of jet-triggered star formation in the CSS phase of radio galaxy evolution.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- November 2021
- DOI:
- 10.1002/asna.20210054
- arXiv:
- arXiv:2111.03818
- Bibcode:
- 2021AN....342.1087D
- Keywords:
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- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 4 pages, 2 figures, Proceedings of the 6th Workshop on GHz-Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) sources