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A Glimpse at Quasar Host Galaxy Far-UV Emission, Using Damped Lyα's as Natural Coronagraphs

Journal Article · · The Astrophysical Journal (Online)
 [1];  [2];  [3];  [2];  [2];  [4];  [5];  [6];  [3];  [7];  [8];  [9];  [10];  [3];  [11]
  1. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory; Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
  2. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
  3. Pierre and Marie Curie Univ., Paris (France). National Scientific Research Center (CNRS), Inst. of Astrophysics
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Australian National Univ., Canberra, ACT (Australia). Research School of Astronomy and Astrophysics
  6. Catalan Inst. for Research and Advanced Studies. Barcelona (Spain); Univ. of Barcelona (Spain). Inst. of Cosmos Sciences
  7. Univ. of Chile, Santiago (Chile). Dept. of Astronomy
  8. Pennsylvania State Univ., University Park, PA (United States). Dept. of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Inst. for Gravitation and the Cosmos
  9. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics & Astronomy
  10. Univ. of Florida, Gainesville, FL (United States). Dept. of Astronomy
  11. Brookhaven National Lab. (BNL), Upton, NY (United States)
In merger-driven models of massive galaxy evolution, the luminous quasar phase is expected to be accompanied by vigorous star formation in quasar host galaxies. In this paper, we use high column density damped Lyα (DLA) systems along quasar sight lines as natural coronagraphs to directly study the far-UV (FUV) radiation from the host galaxies of luminous background quasars. Here, we have stacked the spectra of ~2000 DLA systems (NHI > 1020.6cm–2) with a median absorption redshift $$\langle$$z$$\rangle$$ = 2.6 selected from quasars observed in the SDSS-III Baryon Oscillation Spectroscopic Survey. We detect residual flux in the dark troughs of the composite DLA spectra. The level of this residual flux significantly exceeds systematic errors in the Sloan Digital Sky Survey fiber sky subtraction; furthermore, the residual flux is strongly correlated with the continuum luminosity of the background quasar, while uncorrelated with DLA column density or metallicity. We conclude that the flux could be associated with the average FUV radiation from the background quasar host galaxies (with medium redshift $$\langle$$z$$\rangle$$ = 3.1) that is not blocked by the intervening DLA. Finally, assuming that all of the detected flux originates from quasar hosts, for the highest quasar luminosity bin ($$\langle$$L$$\rangle$$ = 2.5 × 1013 L), the host galaxy has an FUV intensity of 1.5 ± 0.2 × 1040 erg s–1 Å–1; this corresponds to an unobscured UV star formation rate of 9 M yr–1.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI ID:
1335433
Alternate ID(s):
OSTI ID: 22370539
OSTI ID: 1165690
Report Number(s):
BNL--112092-2016-JA; KA2301020
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 793; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

The third release of the Large Quasar Astrometric Catalog (LQAC-3): a compilation of 321 957 objects journal October 2015
Directly imaging damped Ly α galaxies at z > 2 – III. The star formation rates of neutral gas reservoirs at z ∼ 2.7 journal December 2014
QUASARS PROBING QUASARS. VIII. THE PHYSICAL PROPERTIES OF THE COOL CIRCUMGALACTIC MEDIUM SURROUNDING z ∼ 2–3 MASSIVE GALAXIES HOSTING QUASARS journal October 2016
An Intercomparison Study of Two Proximate Damped Ly α Systems with Residual Flux upon the Ly α Absorption Trough toward Quasars journal May 2018
A Strange EUV Emission: Scattered Continuum in the Lyman Limit Absorption Edge toward the Quasar SDSS J125903.26+621211.5? journal August 2018
Deep Hubble Space Telescope Imaging on the Extended Ly α Emission of a QSO at z = 2.19 with a Damped Lyman Alpha System as a Natural Coronagraph journal January 2020
Quasars Probing Quasars VIII. The Physical Properties of the Cool Circumgalactic Medium Surrounding z ~ 2-3 Massive Galaxies Hosting Quasars text January 2015

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