Host galaxies of luminous quasars: population synthesis of optical off-axis spectra - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




Host galaxies of luminous quasars: population synthesis of optical off-axis spectra - Astrophysics > Cosmology and Nongalactic Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: There is increasing evidence of a connection between AGN activity and galaxyevolution. To obtain further insight into this potentially importantevolutionary phase, we analyse the properties of quasar host galaxies. In thispaper, we present a population synthesis modeling technique for off-axisspectra, the results of which constrain host colour and the stellar ages ofluminous quasars M Vnuc<-23. Our technique is similar to well establishedquiescent-galaxy models, modified to accommodate scattered nuclear light acombination of atmospheric, instrumental and host galaxy scattered lightobserved off axis. In our model, subtraction of residual scattered quasar lightis performed, while simultaneously modeling the constituent stellar populationsof the host galaxy. The reliability of this technique is tested via aMonte-Carlo routine in which the correspondence between synthetic spectra withknown parameters and the model output is determined. Application of this modelto a preliminary sample of 10 objects is presented and compared to previousstudies. Spectroscopic data was obtained via long-slit and integral-field unitobservations on the Keck and WIYN telescopes. We confirm that elliptical quasarhosts are distinguishable bluer from inactive ellipticals in rest frame B-Vcolour. Additionally, we note a trend for radio luminous L 5GHz > 10^40 ergs^-1 quasars to be located in redder host galaxies in comparison to their lessluminous radio counterparts. While the host colour and age of our radioluminous sample is in close proximity to the green valley, our radio faintsample is consistent with quiescent star-forming galaxies. However, furtherobservations are needed to confirm these results. Finally, we discuss futureapplications for our technique on a larger sample of objects being obtained viaSALT and WIYN telescope observing campaigns.



Autor: I. Wold, A. I. Sheinis, M. J. Wolf, E. J. Hooper

Fuente: https://arxiv.org/







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