J/MNRAS/381/211 Radio galaxies in the 2SLAQ LRG Survey (Sadler+, 2007)
Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey -
I. The evolution of low-power radio galaxies to z∼0.7.
Sadler E.M., Cannon R.D., Mauch T., Hancock P.J., Wake D.A., Ross N.,
Croom S.M., Drinkwater M.J., Edge A.C., Eisenstein D., Hopkins A.M.,
Johnston H.M., Nichol R., Pimbblet K.A., De Propris R., Roseboom I.G.,
Schneider D.P., Shanks T.
<Mon. Not. R. Astron. Soc., 381, 211-227 (2007)>
=2007MNRAS.381..211S 2007MNRAS.381..211S
ADC_Keywords: Galaxies, radio ; Galaxies, photometry ; Redshifts
Keywords: galaxies: active - galaxies: luminosity function, mass function -
radio continuum: galaxies
Abstract:
We have combined optical data from the 2dF-SDSS (Sloan Digital Sky
Survey) LRG (Luminous Red Galaxy) and QSO (quasi-stellar object)
(2SLAQ) redshift survey with radio measurements from the 1.4GHz VLA
(Very Large Array) FIRST (Faint Images of the Radio Sky at Twenty-cm)
and NVSS (NRAO VLA Sky Survey) surveys to identify a volume-limited
sample of 391 radio galaxies at redshift 0.4<z<0.7. By determining
an accurate radio luminosity function for luminous early-type galaxies
in this redshift range, we can investigate the cosmic evolution of the
radio-galaxy population over a wide range in radio luminosity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 161 391 Redshifts and radio flux densities for 2SLAQ LRGs
which are detected as radio sources
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See also:
VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 2006)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- 2SLAQ 2SLAQ name (JHHMMSS.ss+DDMMSS.s)
21 I1 --- Sample [0/9] Sample to which the galaxy belongs (1)
23- 27 F5.2 mag i(dev) Dereddend i-band magnitude from SDSS
28 A1 --- n_i(dev) (]) Unexplained note on i(dev)
30- 31 I2 h RAh Optical right ascension (J2000) (2)
33- 34 I2 min RAm Optical right ascension (J2000) (2)
36- 40 F5.2 s RAs Optical right ascension (J2000) (2)
42 A1 --- DE- Optical declination sign (J2000) (2)
43- 44 I2 deg DEd Optical declination (J2000) (2)
46- 47 I2 arcmin DEm Optical declination (J2000) (2)
49- 52 F4.1 arcsec DEs Optical declination (J2000) (2)
54- 55 I2 h RAr.h Radio right ascension (J2000) (3)
57- 58 I2 min RAr.m Radio right ascension (J2000) (3)
60- 63 F4.1 s RAr.s Radio right ascension (J2000) (3)
65 A1 --- DEr.- Radio Declination sign (J2000) (3)
66- 67 I2 deg DEr.d Radio Declination (J2000) (3)
69- 70 I2 arcmin DEr.m Radio Declination (J2000) (3)
72- 75 F4.1 arcsec DEr.s Radio Declination (J2000) (3)
77- 82 F6.2 mJy Sp1 FIRST peak radio flux density at 1.4GHz
84- 90 F7.2 mJy St1 ?=- FIRST total 1.4GHz flux density
92 I1 ---- N1 ?=- Number of FIRST radio components
associated with each 2SLAQ galaxy
94- 99 F6.1 mJy St2 ?=- NVSS total 1.4GHz flux density (4)
101-104 F4.1 mJy e_St2 ?=- rms uncertainty on StNVSS
106 I1 --- N2 ?=- Number of NVSS radio components associated
with each 2SLAQ galaxy
108-113 F6.4 --- z Heliocentric redshift measured from 2SLAQ
optical spectra
115 I1 --- q_z [0,5] 2dF redshift quality code, 5 is best (5)
117-122 F6.2 mag RMAG ?=- Extinction-corrected r-band absolute
magnitude (6)
124-128 F5.2 [W/Hz] logPr ?=- Total radio luminosity at 1.4GHz (7)
130-161 A32 --- Notes Notes on individual galaxies
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Note (1): See Fig. 1 and Cannon et al. (2006, Cat. J/MNRAS/372/425)
Note (2): Optical position at which the 2dF fibre was placed
Note (3): Radio positions are taken from the FIRST survey;
for sources with more than one FIRST component, the listed position
is that of either the core (if present) or the radio centroid.
Note (4): For radio sources with more than one NVSS component, the flux
density quoted here is the sum of all the components. A handful of
sources had a single NVSS component and two FIRST components, only one
of which is genuinely associated with the 2SLAQ galaxy. In this case,
the listed NVSS flux density of these sources was reduced in
proportion to the flux-density ratio of the associated and
unassociated FIRST components.
Note (5): Quality flag as follows:
5 = excellent-quality redshift (>99 per cent reliable)
4 = excellent-quality redshift (>99 per cent reliable)
3 = acceptable redshift (>95 per cent reliable)
2 = poor quality redshift
1 = poor quality redshift
0 = highly unreliable redshift
Note (6): The extinction-corrected r-band absolute magnitude M0.2,r for
each galaxy, calculated using the method described by Wake et al.
(2006MNRAS.372..537W 2006MNRAS.372..537W). This incorporates both a k correction and a
further correction for the passive evolution of the stellar
population, and represents the absolute magnitude which each LRG would
have if observed through a standard SDSS r-band filter redshifted to
z=0.2.
Note (7): Total radio luminosity at 1.4GHz, calculated by assuming a mean
spectral index alpha=-0.7 (where flux density Snu{porp.to}nu^alpha)
and the usual k correction of the form k(z)=(1+z)-(1+alpha).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Jan-2008