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The Accretion History of AGN: A Newly Defined Population of Cold Quasars | | Allison Kirkpatrick
; C. Megan Urry
; Jason Brewster
; Kevin C. Cooke
; Michael Estrada
; Eilat Glikman
; Kurt Hamblin
; Tonima Tasnim Ananna
; Casey Carlile
; Brandon Coleman
; Jordan Johnson
; Jeyhan S. Kartaltepe
; Stephanie M. LaMassa
; Stefano Marchesi
; Meredith Powell
; Dave Sanders
; Ezequiel Treister
; Tracey Jane Turner
; | | Date: |
13 Aug 2019 | | Abstract: | Quasars are the most luminous of active galactic nuclei (AGN), and are
perhaps responsible for quenching star formation in their hosts. The Stripe 82X
catalog covers 31.3 deg$^2$ of the Stripe 82 field, of which the 15.6 deg$^2$
covered with XMM-Newton is also covered by Herschel/SPIRE. We have 2500 X-ray
detected sources with multi-wavelength counterparts, and 30\% of these are
unobscured quasars, with $L_X > 10^{44},$erg/s and $M_B < -23$. We define a
new population of quasars which are unobscured, have X-ray luminosities in
excess of $10^{44},$erg/s, have broad emission lines, and yet are also bright
in the far-infrared, with a 250 $mu$m flux density of $S_{
m 250}>30$ mJy. We
refer to these Herschel-detected, unobscured quasars as "Cold Quasars". A mere
4% (23) of the X-ray- and optically-selected unobscured quasars in Stripe 82X
are detected at 250 $mu$m. These Cold Quasars lie at $zsim1-3$, have $M_{
m
dust} sim10^8-10^9 M_odot$, have $L_{
m IR}>10^{12} L_odot$, and have star
formation rates of $200-2000 M_odot$/yr. Cold Quasars are bluer in the mid-IR
than the full quasar population, and 75% of our Cold Quasars have WISE W3 $<$
11.5 [Vega], while only 19% of the full quasar sample meets this criteria.
Crucially, Cold Quasars have $4-7 imes$ as much star formation as the
unobscured quasar population at similar redshifts. This phase is likely
short-lived, as the central engine and immense star formation consume the gas
reservoir. Cold Quasars are type-1 blue quasars that reside in starburst
galaxies. | | Source: | arXiv, 1908.4795 | | Services: | Forum | Review | PDF | Favorites | |
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