A Glimpse at Quasar Host Galaxy Far-UV Emission, Using Damped Lyα's as Natural Coronagraphs
Journal Article
·
· The Astrophysical Journal (Online)
- Univ. of Arizona, Tucson, AZ (United States). Steward Observatory; Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
- Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
- Pierre and Marie Curie Univ., Paris (France). National Scientific Research Center (CNRS), Inst. of Astrophysics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Australian National Univ., Canberra, ACT (Australia). Research School of Astronomy and Astrophysics
- Catalan Inst. for Research and Advanced Studies. Barcelona (Spain); Univ. of Barcelona (Spain). Inst. of Cosmos Sciences
- Univ. of Chile, Santiago (Chile). Dept. of Astronomy
- 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
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics & Astronomy
- Univ. of Florida, Gainesville, FL (United States). Dept. of Astronomy
- 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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