J/A+A/674/A163 Type I quasars luminosity distances (Huang+, 2023)
A measure of cosmological distance using the CIV Baldwin effect in quasars.
Huang L., Wang H., Gao Z., Zeng X., Chang Z.
<Astron. Astrophys. 674, A163 (2023)>
=2023A&A...674A.163H 2023A&A...674A.163H (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Radio sources ; Stars, distances
Keywords: dark energy - quasars: emission lines - quasars: general -
distance scale
Abstract:
We use the anticorrelation between the equivalent width (EW) of the
CIV 1549Å emission line and the continuum luminosity in the quasars
rest frame (Baldwin effect) to measure their luminosity distance as
well as estimate cosmological parameters. We obtain a sample of 471
Type I quasars with the UV-optical spectra and EW (CIV) measurements
in the redshift range of 2.3<z<7.1 including 25 objects at 5<z<7.1,
which can be used to investigate the CIV Baldwin effect and determine
cosmological luminosity distance. The relation
EW(CIV)~(λLλ)γ can be applied to check the
inverse correlation between the CIV EW and Lλ of quasars and
give their distance, and the data suggest that the EW of CIV is
inversely correlated with continuum monochromatic luminosities. On the
other hand, we also consider dividing the Type I quasar sample into
various redshift bins, which can be used to check if the CIV
EW-luminosity relation depends on the redshift. Finally, we apply a
combination of Type I quasars and Type Ia supernovae (SNIa) of the
Pantheon sample to test the property of dark energy concerning whether
or not its density deviates from the constant, and give the
statistical results
Description:
The properties of the 471 Type I quasars with the UV-optical spectra
and EW (CIV) measurements, which can be used to investigate
the CIV Baldwin effect and measure these cosmological luminosity
distances.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 471 The properties of the Type I quasars
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name SDSS name of Type I quasars
(HHMMSS.ss+DDMMSS.s)
20- 27 F8.6 --- z Redshift
29- 34 F6.3 mag rmag SDSS r magnitude
36- 40 F5.3 mag e_rmag Error on r magnitude
42- 48 F7.4 0.1nm EW(CIV) Equivalent width of the CIV 1549Å
emission line
50- 58 E9.7 0.1nm e_EW(CIV) Error on EW(C IV)
60- 71 F12.8 10-7W/Hz/m2 F2500 Rest-frame flux at 2500Å
73- 78 F6.4 10-7W/Hz/m2 e_F2500 Error on Rest-frame flux at 2500Å
80- 90 F11.9 --- GammaUV UV-optical power-law index
92-102 F11.8 --- DM Distance modulus
104-114 F11.9 --- e_DM Error on distance modulus
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Acknowledgements:
Long Huang, huanglong20122021(at)163.com
(End) Patricia Vannier [CDS] 08-Jun-2023