2020ApJ...905...16F -
Astrophys. J., 905, 16-16 (2020/December-2)
Fast outflows in Hot Dust-Obscured Galaxies detected with Keck/NIRES.
FINNERTY L., LARSON K., SOIFER B.T., ARMUS L., MATTHEWS K., JUN H.D., MOON D.-S., MELBOURNE J., GOMEZ P., TSAI C.-W., DIAZ-SANTOS T., EISENHARDT P. and CUSHING M.
Abstract (from CDS):
We present rest-frame optical spectroscopic observations of 24 Hot Dust-Obscured Galaxies (Hot DOGs) at redshifts 1.7-4.6 with KECK/NIRES. Our targets are selected, based on their extreme red colors, to be the highest-luminosity sources from the WISE infrared survey. In 20 sources with well-detected emission, we fit the key [O III], Hβ, Hα, [N II], and [S II] diagnostic lines to constrain physical conditions. Of the 17 targets with a clear detection of the [O III]λ5007 Å emission line, 15 display broad blueshifted and asymmetric line profiles, with widths ranging from 1000 to 8000 km s–1 and blueshifts up to 3000 km s–1. These kinematics provide strong evidence for the presence of massive ionized outflows of up to 8000 M☉yr–1, with a median of 150 M☉yr–1. As many as eight sources show optical emission line ratios consistent with vigorous star formation. Balmer-line star formation rates, uncorrected for reddening, range from 30 to 1300 M☉yr–1, with a median of 50 M☉yr–1. Estimates of the SFR from Spectral Energy Distribution fitting of mid- and far-infrared photometry suggest significantly higher values. We estimate the central black hole masses to be of order 108–10M☉, assuming the present-day MBH–σ* relation. The bolometric luminosities and the estimated masses of the central black holes of these galaxies suggest that many of the active galactic nucleus-dominated Hot DOGs are accreting at or above their Eddington limit. The combination of ongoing star formation, massive outflows, and high Eddington ratios suggest Hot DOGs are a transitional phase in galaxy evolution.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Infrared galaxies - High-redshift galaxies - Active galaxies
Simbad objects:
26
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