The Starburst-AGN connection: quenching the fire and feeding the beast
Jorge Melnick (ESO Santiago, OAN), Eduardo Telles (OAN, Rio de, Janeiro, Brasil), Roberto De Propris (FINCA, University of Turku, Finland),, Chu Zhang-Hu (Nanjing University, P. R. China)

TL;DR
This paper investigates the transitional phase of post-starburst quasars (PSQ) in galaxy evolution, analyzing their properties to understand how they connect the luminous infrared galaxies, quasars, and early-type galaxies.
Contribution
It provides a detailed analysis of 72 PSQ, revealing their spectral energy distributions, AGN properties, and potential evolutionary pathways, highlighting the need for further multi-wavelength observations.
Findings
PSQ have weaker, metal-poor intermediate populations compared to K+A galaxies.
Their spectral energy distribution includes starlight, an obscured power-law, and hot dust components.
Most PSQ lack strong radio or X-ray emissions, suggesting obscured or starburst-dominated AGN activity.
Abstract
The merger of two spiral galaxies is believed to be one of the main channels for the production of elliptical and early-type galaxies. In the process, the system becomes an (ultra) luminous infrared galaxy, or (U)LIRG, that morphs to a quasar, to a K+A galaxy, and finally to an early-type galaxy. The time scales for this metamorphosis are only loosely constrained by observations. In particular, the K+A phase should follow immediately after the QSO phase during which the dust and gas remaining from the (U)LIRG phase are expelled by the AGN. An intermediate class of QSOs with K+A spectral signatures, the post-starburst QSOs or PSQ, may represent the transitional phase between QSOs and K+As. We have compiled a sample of 72 {bona fide} PSQ from the SDSS DR7 QSO catalogue. We find the intermediate age populations in this sample to be on average significantly weaker and metal poorer…
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