J/PAZh/45/464 3XMM-DR4 QSO candidates optical spectroscopy (Khorunzhev+, 2019)
Optical spectroscopy of candidates for quasars at 3<z<5.5 from the XMM-Newton
X-ray survey. A distant X-ray quasar at z=5.08.
Khorunzhev G.A., Burenin R.A., Sazonov S.Yu., Amvrosov A., Eselevich M.V..
Zaznobin I.A.
<Pis'ma Astron. Zh. 43, 159-169 (2017) and 45, 464-479 (2019)>
=2019PAZh...45..464K 2019PAZh...45..464K
+2017PAZh...43..159K 2017PAZh...43..159K (SIMBAD/NED BibCode)
=2017AstL...43..135K 2017AstL...43..135K
+2019AstL...45..411K 2019AstL...45..411K
ADC_Keywords: QSOs ; Spectra, optical; Redshifts
Keywords: active galactic nuclei - X-ray surveys - photometric redshifts -
spectroscopy - XMM-Newton - X-ray sources - QSOs - Redshifts -
Spectroscopy, optical - AZT-33IK - BTA
Abstract:
We present the results of optical spectroscopy for 58 quasar
candidates at photometric redshifts z≳3, 57 of which enter into the
Khorunzhev et al. (2016, Cat. J/PAZh/42/313) catalog (K16). This is a
catalog of quasar candidates and known type 1 quasars selected among
the X-ray sources of the 3XMM-DR4 catalog of the XMM-Newton
serendipitous survey. At first we have performed spectroscopy for a
quasi-random sample of 19 candidates at the 1.6-m AZT-33IK telescope
of the Sayan Solar Observatory and the 6-m BTA telescope of the
Special Astrophysical Observatory (SAO RAS). Then we have continued
the observation for 39 X-ray bright candidates that could be used for
the X-ray luminosity function construction (see Khorunzhev et al.
2018AstL...44..500K 2018AstL...44..500K). The spectra at AZT-33IK were taken with the new
low- and medium-resolution ADAM spectrograph that was produced and
installed on the telescope in 2015. One of the most distant (z=5.08)
optically bright (i=21) quasars ever detected in X-ray surveys has
been discovered.
Description:
Objects' spectra for quasi-random sample were published at Khorunzhev
et al. 2017AstL...43..135K 2017AstL...43..135K; Their spectra were done before 2016/09/28.
Objects' spectra for confirmed X-ray bright candidates will be
published at Khorunzhev et al. 2019AstL...45..411K 2019AstL...45..411K; Object
J025459.8+192343 does not enter in K16 catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 58 Quasar catalog
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See also:
IX/44 : XMM-Newton Serend. Source Catalogue 3XMM-DR4 (XMM-SSC, 2013)
IX/55 : XMM-Newton Serend. Source Catalogue 3XMM-DR8 (XMM-SSC, 2018)
VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)
J/PAZh/42/313 : 3XMM-DR4 QSO candidates at 3<z<5.5 (Khorunzhev+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name 3XMM object name in 3XMM-DR4 (Cat. IX/44),
JHHMMSS.s+DDMMSS
20- 27 F8.4 deg RAdeg Right ascension (J2000)
31- 37 F7.4 deg DEdeg Declination (J2000)
39- 57 A19 --- objID SDSS objID
59- 62 F4.2 10aW/m2 FX05-2 X-ray flux 0.5-2 keV band
(in 10-14erg/s/cm2)
66- 70 F5.2 mag ipmag SDSS PSF magnitude in i band
71- 75 F5.2 --- zph Photometric redshift
77- 86 A10 "date" Obs.Date Observation Date YYYY/MM/DD
89- 94 A6 --- Inst Instrument of observation (1)
97-102 A6 s Etime N_exposure x timeofexposure
104-108 F5.3 --- zsp ? Spectroscopic redshift (2)
110-111 A2 --- QF Quality flag for object spectrum (3)
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Note (1): Instrument code as follows:
A300 = ADAM spectrograph at the 1.6-m AZT-33IK telescope of the Sayan Solar
Observatory, volume-phase holographic grating VPHG300
A600G = ADAM spectrograph at the 1.6-m AZT-33IK telescope of the Sayan Solar
Observatory, volume-phase holographic grating VPHG600G
A600R = ADAM spectrograph at the 1.6-m AZT-33IK telescope of the Sayan Solar
Observatory, volume-phase holographic grating VPHG600R
S550R = Scorpio spectrograph at the 6-m BTA telescope of the SAO RAS,
volume-phase holographic gratings VPHG550R
SII950 = Scorpio II spectrograph at the 6-m BTA telescope of the SAO RAS
and the VPHG940@600 is in use.
Note (2): Empty field of zspec notes that we could not determine an object's
redshift by obtained spectrum. It could be a star in some cases.
Note (3): Quality flag for obtained spectrum as follows:
0 = succesfull redshift identification by more than one clearly visible
spectral lines
1 = suspicious redshift identification by one spectral lines or a redshift
identification cannot be done (see articles' text in some cases)
D = there is an another possible optical counterpart for the X-ray source
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Acknowledgements:
Georgii Khorunzhev, horge(at)iki.rssi.ru
(End) Patricia Vannier [CDS] 25-Feb-2019