Host galaxies of local hard X-ray selected AGN

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dc.contributor.advisorBauer, Franz Erik
dc.contributor.authorDoll Carriel, Goran
dc.contributor.otherPontificia Universidad Católica de Chile. Instituto de Astrofísica
dc.date.accessioned2022-03-04T16:20:44Z
dc.date.available2022-03-04 13:20
dc.date.issued2022
dc.date.updated2022-02-07T17:23:00Z
dc.descriptionTesis (Magíster en Astronomía)--Pontificia Universidad Católica de Chile, 2022
dc.description.abstractWe investigate the evolutionary state of galaxies hosting active galactic nuclei (AGN) for a sample of 138 hard X-ray selected AGN from the BAT AGN Spectroscopic Survey (BASS) catalog and which have high-resolution (R ∼ 5000), VLT/X-SHOOTER 0.3–1 µm spectroscopy. We perform a stellar population synthesis analysis via pPXF fitting of the stellar continuum, as well as fit specific emission and absorption features (e.g., Lick indices, line ratios), to estimate AGN/star formation contributions, dust obscuration, stellar age, metallicity and star formation histories. Additionally, we perform morphological classification on our sample to study possible correlations to said evolutionary state. We compare our results to AGN X-ray properties and infrared (IR) derived SFRs to estimate the potential for AGN feedback. Using several cuts and selection criteria, we construct a comparison sample from SDSS DR7 data in the MPA-JHU catalog to place our AGN sample in the context with overall galaxy evolution. The X-SHOOTER spectra primarily probe the central regions of the AGN hosts, which tend to be dominated by old (> 10 Gyr) stellar populations. However, we find our sample primarily composed of main-sequence spirals (46%), followed by green valley spirals (14%) and green valley ellipticals (14%), with almost no galaxies present in the red sequence according to our definition. Our spectral modeling suggests that most elliptical and blue spiral hosts of AGN experienced strong episodes of star formation at intermediate ages (∼ 1–6 Gyr), which strongly correlate with their apparent morphological features (tails, remnant features). In contrast, most red spirals seem to follow a completely secular evolution. Comparison of IR and optically derived SFRs for 57 AGN in the sample implies copious obscured star formation; this appears to push otherwise optically passive elliptical hosts into the green valley or main sequence. As for the effect of AGN feedback, we only find very mild correlations between the AGN and the host bulge properties, thereby implying weak links between the current AGN event and their intermediate-age populations.
dc.description.version2022-02-09
dc.format.extentxlvi páginas
dc.fuente.origenAutoarchivo
dc.identifier.doi10.7764/tesisUC/AST/63303
dc.identifier.urihttps://doi.org/10.7764/tesisUC/AST/63303
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/63303
dc.information.autorucInstituto de Astrofísica ; Bauer, Franz Erik ; 0000-0002-8686-8737 ; 1007961
dc.information.autorucInstituto de Astrofísica ; Doll Carriel, Goran ; S/I ; 233341
dc.nota.accesoContenido completo
dc.rightsacceso abierto
dc.subject.ddc523.112
dc.subject.deweyAstronomíaes_ES
dc.subject.otherNúcleo galáctico activoes_ES
dc.subject.otherGalaxiases_ES
dc.subject.otherEstrellas - Poblacioneses_ES
dc.titleHost galaxies of local hard X-ray selected AGNes_ES
dc.typetesis de maestría
sipa.codpersvinculados1007961
sipa.codpersvinculados233341
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