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VII/223 The 2dF QSO Redshift Survey. V. The 10k catalogue (Croom+ 2001)
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The 2dF QSO Redshift Survey - V. The 10k catalogue.
Croom S.M., Smith R.J., Boyle B.J., Shanks T., Loaring N.S., Miller L.,
Lewis I.J.
<Mon. Not. R. Astron. Soc. 322, L29 (2001)>
=2001MNRAS.322L..29C
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ADC_Keywords: Active gal. nuclei; QSOs; Redshifts; Spectroscopy;
Stars, white dwarf; Stars, normal; Galaxies, spectra
Keywords: catalogues - surveys - white dwarfs - galaxies: active -
quasars: general - galaxies: Seyfert
Description:
The 2dF QSO Redshift Survey (2QZ) 10k catalogue is the first release
of the 2QZ, containing over 10000 QSOs. There are a total of 20590
sources listed, for which spectra have been obtained using the
2-degree field facility at the Anglo-Australian Observatory. Current
data covers an effective area of 289.6deg^2^ for QSO candidates with
magnitudes 18.25<b_J_<20.85. The file 2qz_10k.dat contains the
names, positions, magnitudes, spectroscopic identifications and
redshifts for each of the sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
2qz10k.dat 199 20590 List of object properties including position,
identification and redshift
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See also:
http://www.2dfquasar.org/ : The 2dF QSO Redshift Survey (2QZ)
Byte-by-byte Description of file: 2qz10k.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [2QZ] Name of Survey
5- 20 A16 --- Name Name of the source in 2QZ
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 32 F5.2 s RAs Right ascension (J2000)
34 A1 --- DE- Declination sign
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 44 F4.1 arcsec DEs Declination (J2000)
46- 53 F8.6 rad RArad Right ascension (J2000)
55- 63 F9.6 rad DErad Declination (J2000)
65- 69 F5.2 mag bJmag b_J_ magnitude
71- 75 F5.2 mag u-bJ u-b_J_ colour
77- 82 F6.2 mag bJ-r b_J_-r colour (1)
84 I1 --- o_bJmag Number of observations (2)
86- 90 F5.3 --- z1 Redshift from first spectrum
92- 93 I2 --- q_z1 Quality flag for first spectrum (3)
95-105 A11 --- id1 Identification for first spectrum (4)
107-116 A10 "D/M/Y" date1 Date of observation for first spectrum (5)
118-121 I4 --- fld1 field and spectrograph for first spectrum (6)
123-128 F6.2 --- sn1 Signal-to-noise ratio for first spectrum (7)
130-134 F5.3 --- z2 ?=0 Redshift from second spectrum
136-137 I2 --- q_z2 Quality flag for second spectrum (3)
139-149 A11 --- id2 Identification for second spectrum (4)
151-160 A10 "D/M/Y" date2 ?Date of observation for second spectrum (5)
162-165 I4 --- fld2 field and spectrograph for second spectrum (6)
167-172 F6.2 --- sn2 Signal-to-noise ratio for second spectrum (7)
174-178 F5.3 --- zprev ?=0 Redshift if previously known (8)
180-185 F6.1 mJy F21cm ?=0 Flux at 1.4GHz from NVSS (9)
187-193 F7.4 mW/m2 FRASS ?=0 Flux at 0.1-2.4keV x 10^-13 from RASS (10)
195-199 F5.3 mag E(B-V) Reddening E(B-V) from Schegel et al. 1998 (11)
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Note (1): In the case of an object having only an upper limit in the r-band,
the b_J_-r colour is defined as (b_J_-r_lim_)-10. All r-band
detections have b_J_-r>-1.5 while this definition gives all upper
limits b_J_-r<-9.8.
Note (2): The number of independent spectra taken.
The highest quality spectrum is always spectrum 1.
Note (3): Both redshift and identification are given separate quality flags:
1 for a high-quality identification or redshift
2 for a low-quality identification or redshift
3 for an unclassifiable identification or redshift
The quality flag is set as
identification quality x 10 + redshift quality
Note (4): There are six main classifications:
QSO for a spectrum with broad emission lines
NELG (narrow-emission line galaxy) for a spectrum with narrow
emission lines
gal a galaxy spectrum with no emission lines
star a Galactic star spectrum
cont a high signal-to-noise (S/N>10) spectrum with no identifiable
emission of absorption features
?? an unclassifiable spectrum
Sub-classes are contained within parentheses after the main classifications:
DA a DA white dwarf
DB a DB white dwarf
DO a DO white dwarf
DZ a DZ white dwarf
CV a star with string hydrogen Balmer emission lines
DAM a DA white dwarf - M-dwarf binary
DBM a DB white dwarf - M-dwarf binary
BAL a broad absoprtion line QSO
For example QSO(BAL), star(DA), star(CV).
If the identification has a class 2 quality then there is a ?
appended to the end of the identification.
Note (5): The date is given in the format dd/mm/yyyy.
Note (6): The 2dF field number (<1000) x 10 + the 2dF spectrograph number
(1 or 2). e.g. field number 218 and spectrograph 2 gives 2182.
Note (7): Signal-to-noise calculated in a 400nm to 490nm band
Note (8): The previously known redshift is taken from:
Quasars and Active Galactic Nuclei (9th Ed.) Veron-Cetty M.P.,
Veron P., 2000, ESO Scientific Report 19, Cat. <VII/215>
Note (9): the 1.4GHz radio flux is taken from the NRAO VLA Sky Survey (NVSS),
Condon et al., 1998AJ....115.1693C, Cat. <VIII/65>
Note (10): The X-ray flux is taken from the ROSAT All Sky Survey, Voges et al.,
1999A&A...349..389V, Cat. <IX/10>; Voges et al., 2000IAUC.7432....3V.
Counts/s in the 0.1 to 2.4keV band were converted to flux in
erg/s/cm^2^ (or equivalently mW/m^2^) assuming a photon index of -2
giving a conversion factor of 5.6x10^-12.
Note (11): The reddening for a source is taken from Schlegel et al.,
1998ApJ...500..525S
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Author's address:
Scott Croom <scroom@aaoepp.aao.gov.au>
References:
Boyle et al., Paper I 2000MNRAS.317.1014B
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(End) Scott Croom [AAO] 04-Apr-2001