J/AJ/162/270 VLA observation of 50 z∼1.65 quasars (Richards+, 2021)
Probing the wind component of radio emission in luminous high-redshift quasars.
Richards G.T., Mccaffrey T.V., Kimball A., Rankine A.L., Matthews J.H.,
Hewett P.C., Rivera A.B.
<Astron. J., 162, 270-270 (2021)>
=2021AJ....162..270R 2021AJ....162..270R (SIMBAD/NED BibCode)
ADC_Keywords: QSOs; Spectra, radio; Optical; Ultraviolet; Redshifts
Keywords: Radio quiet quasars; Galaxy accretion disks; Radio loud quasars
Galactic winds; Radio continuum emission; Optical observation
Emission line galaxies
Abstract:
We discuss a probe of the contribution of wind-related shocks to the
radio emission in otherwise radio-quiet quasars. Given (1) the
nonlinear correlation between UV and X-ray luminosity in quasars, (2)
that such a correlation leads to higher likelihood of
radiation-line-driven winds in more luminous quasars, and (3) that
luminous quasars are more abundant at high redshift, deep radio
observations of high-redshift quasars are needed to probe potential
contributions from accretion disk winds. We target a sample of 50
z∼1.65 color-selected quasars that span the range of expected
accretion disk wind properties as traced by broad CIV emission. 3GHz
observations with the Very Large Array to an rms of ∼10µJy/beam
probe to star formation rates of ∼400M☉/yr, leading to 22
detections. Supplementing these pointed observations are survey data
of 388 sources from the LOFAR Two-meter Sky Survey Data Release 1 that
reach comparable depth (for a typical radio spectral index), where 123
sources are detected. These combined observations reveal a radio
detection fraction that is a nonlinear function of CIV emission-line
properties and suggest that the data may require multiple origins of
radio emission in radio-quiet quasars. We find evidence for radio
emission from weak jets or coronae in radio-quiet quasars with low
Eddington ratios, with either (or both) star formation and accretion
disk winds playing an important role in optically luminous quasars and
correlated with increasing Eddington ratio. Additional pointed radio
observations are needed to fully establish the nature of radio
emission in radio-quiet quasars.
Description:
We observed these targets in the Very Large Array (VLA) C
configuration and in the S band (∼2-4GHz).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 50 Target quasar properties
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
J/AJ/141/182 : Radio and optical properties of QSOs (Kimball+, 2011)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/MNRAS/410/860 : Redshift dependence of BAL QSOs (Allen+, 2011)
J/ApJ/768/37 : Radio emission from SDSS quasars (Condon+, 2013)
J/ApJS/206/4 : SED & bolometric corrections luminous QSOs (Krawczyk+, 2013)
J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)
J/MNRAS/455/4191 : Radio emission from radio-quiet quasars (Zakamska+, 2016)
J/A+A/602/A2 : VLA-COSMOS 3 GHz Large Project. II. (Smolcic+, 2017)
J/ApJ/841/76 : Intrinsic far-IR SED of luminous AGNs (Lyu+, 2017)
J/MNRAS/465/2120 : CIV-based virial black hole masses (Coatman+, 2017)
J/MNRAS/477/830 : Radio flux density of extremely red quasars (Hwang+, 2018)
J/A+A/622/A1 : LOFAR Two-metre Sky Survey DR1 source catalog (Shimwell+, 2019)
J/A+A/622/A15 : Broad absorption line quasars in LDR1 (Morabito+, 2019)
J/MNRAS/492/719 : Chandra observations of 2106 radio-quiet QSOs (Timlin+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- SDSS SDSS identifier
26- 35 F10.6 deg RAdeg [3.42/359] Right Ascension (J2000)
37- 45 F9.6 deg DEdeg [-9.64/65.6] Declination (J2000)
47- 52 F6.4 --- z [1.65/1.66] Spectroscopic redshift
54- 59 F6.2 mag IMAG [-27.9/-26] Absolute I band AB magnitude
61- 65 F5.2 [W] L1350 [45.6/46.6] log 1350Å source luminosity
67 I1 --- BAL? [0/1] A BALQSO source?
69- 75 F7.1 uJy F3 [19.5/56300] Flux density at 3GHz
77- 81 F5.1 uJy e_F3 [0/150]?=0.0 Uncertainty in L3 (1)
83- 87 F5.2 [W/Hz] L3 [23.4/26.9] log 3GHz source luminosity (1)
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Note (1): A blank uncertainty in F3 indicates both the 3GHz flux and
luminosity were 3σ upper limits.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 04-Mar-2022