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Extreme submillimetre starburst galaxies

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Title: Extreme submillimetre starburst galaxies
Authors: Rowan-Robinson, M
Wang, L
Farrah, D
Rigopoulou, D
Gruppioni, C
Vaccari, M
Marchetti, L
Clements, DL
Pearson, WJ
Item Type: Journal Article
Abstract: We have used two catalogues, a Herschel catalogue selected at 500 μm (HerMES) and an IRAS catalogue selected at 60 μm (RIFSCz), to contrast the sky at these two wavelengths. Both surveys demonstrate the existence of “extreme” starbursts, with star-formation rates (SFRs) > 5000 M⊙ yr−1. The maximum intrinsic star-formation rate appears to be ~30 000 M⊙ yr−1. The sources with apparent SFR estimates higher than this are in all cases either lensed systems, blazars, or erroneous photometric redshifts. At redshifts between three and five, the time-scale for the Herschel galaxies to make their current mass of stars at their present rate of star formation is ~108 yr, so these galaxies are making a significant fraction of their stars in the current star-formation episode. Using dust mass as a proxy for gas mass, the Herschel galaxies at redshift three to five have gas masses comparable to their mass in stars. Of the 38 extreme starbursts in our Herschel survey for which we have more complete spectral energy distribution (SED) information, 50% show evidence for QSO-like optical emission, or exhibit AGN dust tori in the mid-infrared SEDs. In all cases however the infrared luminosity is dominated by a starburst component. We derive a mean covering factor for AGN dust as a function of redshift and derive black hole masses and black hole accretion rates. There is a universal ratio of black-hole mass to stellar mass in these high redshift systems of ~10−3, driven by the strong period of star-formation and black-hole growth at z = 1−5.
Issue Date: 21-Nov-2018
Date of Acceptance: 9-Sep-2018
URI: http://hdl.handle.net/10044/1/64888
DOI: https://dx.doi.org/10.1051/0004-6361/201832671
ISSN: 0004-6361
Publisher: EDP Sciences
Journal / Book Title: Astronomy and Astrophysics
Volume: 619
Copyright Statement: © 2018 ESO.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Imperial College Trust
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/J001368/1
N/A
ST/K004131/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: evolution
infrared: galaxies
galaxies: star formation
quasars: supermassive black holes galaxies: starburst
cosmology: observations
SPECTRAL ENERGY-DISTRIBUTIONS
ACTIVE GALACTIC NUCLEI
STAR-FORMING GALAXIES
HYPERLUMINOUS INFRARED GALAXIES
COSMOLOGY LEGACY SURVEY
HIGH-REDSHIFT GALAXIES
FORMATION RATE DENSITY
DEEP-FIELD-SOUTH
EXTRAGALACTIC SURVEY
NUMBER COUNTS
astro-ph.GA
0201 Astronomical And Space Sciences
Publication Status: Published
Article Number: A169
Online Publication Date: 2018-11-21
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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