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A panchromatic survey of post-starburst mergers: searching for feedback

De Propris R; Melnick J

dc.contributor.authorDe Propris R
dc.contributor.authorMelnick J
dc.date.accessioned2022-10-28T13:24:32Z
dc.date.available2022-10-28T13:24:32Z
dc.identifier.urihttps://www.utupub.fi/handle/10024/164972
dc.description.abstract<p> We consider the morphology, stellar populations, structure and AGN activity of 10 post-starburst (K+A) galaxies with Hubble Space Telescope (HST) observations, full spectral coverage in the optical, spectral energy distributions from 0.2 to 160 mu m, X-ray and radio data. Our results show that the post-starburst galaxy (PSG) phenomenon is related to mergers and interactions, and that star formation was likely triggered during close passes prior to final coalescence. We performed a detailed qualitative analysis of the observed light distribution, including low surface brightness tidal features and colour profiles, in high-resolution multiband imaging with HST. We find evidence that star formation was centrally concentrated and that quenching took place from the inside-out, consistent with the occurrence of a feedback episode. Most of our PSGs contain massive bulges and therefore should host supermassive black holes. We search for AGN activity in spectra (line ratios), optical variability, X-ray emission at 0.5-7.0 KeV and radio emission at 20 cm: all four lines of evidence show that there is no active AGN accreting at more than 0.1 per cent of the Eddington luminosity. We conclude that mergers may be a necessary, but not a sufficient condition, for AGN activity and that they are not likely to be important in our objects. If PSGs are good test cases for quenching and evolution to the red sequence, AGNs may play a smaller role than expected.</p>
dc.publisherOXFORD UNIV PRESS
dc.titleA panchromatic survey of post-starburst mergers: searching for feedback
dc.identifier.urnURN:NBN:fi-fe2021042715088
dc.relation.volume439
dc.contributor.organizationfi=Suomen ESO-keskus, yhteiset|en=Finnish Centre for Astronomy with ESO - FINCA|
dc.contributor.organization-code2609700
dc.converis.publication-id3160166
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/3160166
dc.format.pagerange2847
dc.format.pagerange2837
dc.identifier.jour-issn0035-8711
dc.okm.affiliatedauthorDe Propris, Roberto
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeJournal article
dc.relation.doi10.1093/mnras/stu141
dc.relation.ispartofjournalMonthly Notices of the Royal Astronomical Society
dc.relation.issue3
dc.year.issued2014


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