J/MNRAS/494/789 NIR and MIR photometry of known z≥5 quasars (Ross+, 2020)
The near and mid-infrared photometric properties of known redshift z≥5 quasars.
Ross N.P., Cross N.J.G.
<Mon. Not. R. Astron. Soc., 494, 789-803 (2020)>
=2020MNRAS.494..789R 2020MNRAS.494..789R (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Redshifts ; Photometry, infrared ; Positional data
Keywords: galaxies: evolution - quasars: general - infrared: galaxies -
galaxies: high-redshift
Abstract:
We assemble a catalogue of 488 spectroscopically confirmed very high
(z≥5.00) redshift quasars (VHzQ) and report their near- (ZYJHKs/K)
and mid- (WISE W1234) infrared properties. 97 per cent of the VHzQ
sample is detected in one or more near-infrared (NIR) band, with lack
of coverage rather than lack of depth being the reason for the
non-detections. 389 (80 per cent) of the very high redshift quasars
are detected at 3.4µm in the W1 band from the unWISE catalogue and
all of the z≥7 quasars are detected in both unWISE W1 and W2. Using
archival Wide Field Camera (WFCAM)/United Kingdom Infrared Telescope
(UKIRT) and VISTA Infrared Camera (VIRCAM)/Visible and Infrared Survey
Telescope for Astronomy (VISTA) data we check for photometric
variability that might be expected from super-Eddington accretion. We
find 28 of the quasars have sufficient NIR measurements and
signal-to-noise ratio to look for variability. Weak variability was
detected in multiple bands of Sloan Digital Sky Survey (SDSS)
J0959+0227, and very marginally in the Y-band of MMT J0215-0529. Only
one quasar, SDSS J0349+0034, shows significant differences between
WFCAM and VISTA magnitudes in one band. With supermassive black hole
accretion likely to be redshift invariant up to very high redshift,
further monitoring of these sources is warranted. All the data,
analysis codes and plots used and generated here can be found at:
github.com/d80b2t/VHzQ.
Description:
We have compiled a list of 488 quasars with redshifts z≥5.00. We use
all the z≥5.00 quasars that have been discovered, spectroscopically
confirmed and published as of 2018 December 31 (MJD 58483). We then
obtain optical, NIR and MIR photometry for the spectral data set. The
NIR data comes from two sources: first, the WFCAM (Casali et al.
2007A&A...467..777C 2007A&A...467..777C) on the UKIRT, primarily, but not exclusively, as
part of the UKIRT Infrared Deep Sky Survey (UKIDSS; Lawrence et al.
2007MNRAS.379.1599L 2007MNRAS.379.1599L, Cat. II/314). And second, data from the VIRCAM on
the VISTA (Dalton et al. 2006SPIE.6269E..0XD; Emerson, McPherson &
Sutherland 2006Msngr.126...41E 2006Msngr.126...41E). The MIR, λ=3-30µm
wavelength data is from the Wide-Field Infrared Survey Explorer (WISE;
Wright et al. 2010AJ....140.1868W 2010AJ....140.1868W; Cutri 2013wise.rept....1C) mission.
The redshifts for the VHzQs generally come from the measurement of
broad ultraviolet (UV)/optical emission lines. There are far infrared
emission lines e.g. CII 158µm available for several objects, but at
the level of our current analysis broadline redshifts are sufficient.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 432 488 488 very high-z quasars with near and MIR
photometry
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See also:
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/363 : The band-merged unWISE Catalog (Schlafly+, 2019)
II/328 : AllWISE Data Release (Cutri+ 2013)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Quasar name
25- 38 F14.10 deg RAdeg Right ascension (J2000)
40- 56 F17.13 deg DEdeg Declination (J2000)
58- 70 F13.11 --- z Redshift
72- 84 F13.10 mag Zmag ? Z-band magnitude (AB)
86- 105 F20.18 mag e_Zmag ? Error on Zmag
107- 119 F13.10 mag Ymag ? Y-band magnitude (AB)
121- 141 F21.18 mag e_Ymag ? Error on Ymag
143- 155 F13.10 mag Jmag ? J-band magnitude (AB)
157- 176 F20.18 mag e_Jmag ? Error on Jmag
178- 190 F13.10 mag Hmag ? H-band magnitude (AB)
192- 212 F21.18 mag e_Hmag ? Error on Hmag
214- 226 F13.10 mag Kmag ? K-band magnitude (AB)
228- 248 F21.18 mag e_Kmag ? Error on Kmag
250- 262 F13.10 mag W1mag ? W1-band unWISE magnitude (AB) (1)
264- 279 F16.14 mag e_W1mag ? Error on W1mag
281- 295 F15.11 --- W1SNR ? Signal to noise ratio on the W1-band
297- 309 F13.10 mag W2mag ? W2-band unWISE magnitude (AB) (1)
311- 326 F16.14 mag e_W2mag ? Error on W2mag
328- 342 F15.11 --- W2SNR ? Signal to noise ratio on the W2-band
344- 356 F13.10 mag W3mag ? W3-band AllWISE magnitude (AB) (1)
358- 372 F15.13 mag e_W3mag ? Error on W3mag (2)
374- 388 F15.12 --- W3SNR ? Signal to noise ratio on the W3-band
390- 402 F13.11 mag W4mag ? W4-band AllWISE magnitude (AB) (1)
404- 417 F14.12 mag e_W4mag ? Error on W4mag (2)
419- 432 F14.12 --- W4SNR ? Signal to noise ratio on the W4-band
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Note (1): The AB magnitude system is used with the WISE Vega to AB offsets being
(ΔW1,ΔW2,ΔW3,ΔW4)=(2.669, 3.281, 5.148, 6.66)
Note (2): WISE AllWISE W3 and W4 values without formal errors are low-SNR
detections
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 22-May-2023