J/MNRAS/352/1245 Faint 1.4GHz radio sources in 2dFGRS (Chan+, 2004)
Faint 1.4-GHz radio sources in the 2dF Galaxy Redshift Survey.
Chan B.H.P., Cram L.E., Sadler E.M., Killeen N.E.B., Jackson C.A.,
Mobasher B., Ekers R.D.
<Mon. Not. R. Astron. Soc., 352, 1245-1254 (2004)>
=2004MNRAS.352.1245C 2004MNRAS.352.1245C
ADC_Keywords: Radio sources ; Redshifts
Keywords: surveys - galaxies: distances and redshifts - galaxies: evolution -
galaxies: fundamental parameters - galaxies: statistics -
radio continuum: galaxies
Abstract:
We have used the Australia Telescope Compact Array (ATCA) to search
for faint radio sources in a ∼3deg2 region of sky covered by the
2dF Galaxy Redshift Survey (2dFGRS, Cat. VII/226). Over the region
surveyed, the 1σ noise level at 1.4GHz ranges from 20Jy to 1mJy.
The survey region includes 365 2dFGRS galaxies, of which 316 have
good-quality spectra (176 early-type galaxies or active galactic
nuclei, and 140 star-forming galaxies). The fraction of 2dFGRS
galaxies detected as radio sources in our survey rises from ∼4% at a
3σ detection limit of 0.3mJy to 12% at 75µJy, with roughly
equal numbers of star-forming galaxies and active galactic nuclei
(AGNs) being detected.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 124 34 2dFGRS radio identifications
table4.dat 62 331 2dFGRS radio upper limits
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See also:
VII/226 : The 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh 2dFGRS right ascension (J2000)
4- 5 I2 min RAm 2dFGRS right ascension (J2000)
7- 11 F5.2 s RAs 2dFGRS right ascension (J2000)
13 A1 --- DE- 2dFGRS declination sign (J2000)
14- 15 I2 deg DEd 2dFGRS declination (J2000)
17- 18 I2 arcmin DEm 2dFGRS declination (J2000)
20- 23 F4.1 arcsec DEs 2dFGRS declination (J2000)
25- 34 A10 --- 2dFGRS 2dFGRS (VII/226) name
36- 41 F6.4 --- z 2dFGRS Redshift
43- 47 F5.2 mag Bjmag Final Bj magnitude used in 2dFGRS
49 I1 --- q_z [1/5] 2dFGRS redshift measurement quality (G1)
51- 54 A4 --- Class Visual spectral classification (G2)
56 I1 --- FM [1/3] Fitting method used to derive the radio
flux density (1)
58- 59 I2 h RAVh ? VSAD-5σ radio right ascension (J2000)
61- 62 I2 min RAVm ? VSAD-5σ radio right ascension (J2000)
64- 68 F5.2 s RAVs ? VSAD-5σ radio right ascension (J2000)
70 A1 --- DEV- VSAD-5σ radio declination sign (J2000)
71- 72 I2 deg DEVd ? VSAD-5σ radio declination (J2000)
74- 75 I2 arcmin DEVm ? VSAD-5σ radio declination (J2000)
77- 80 F4.1 arcsec DEVs ? VSAD-5σ radio declination (J2000)
82- 84 F3.1 arcsec Delta ? Estimated VSAD fitted positional uncertainty
86- 90 F5.3 arcsec Sep ? Radio-optical angular separation
92- 97 F6.3 mJy Speak ? Peak 1.4GHz radio flux density (2)
99-104 F6.3 mJy Stot ? Integrated 1.4GHz radio flux density (2)
106-107 I2 % e_S Percentage radio flux uncertainty (3)
109-113 F5.3 mJy e_Speak Actual radio flux uncertainty (3)
115-120 F6.4 mJy sigma-n Estimated local noise
122-124 I3 --- S/N Signal-to-noise ratio (Speak/σn)
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Note (1): The fitting method used to derive the radio flux density:
1 = VSAD≥ 5σ match;
2 = IMFIT≥ 3σ match, and
3 = pixel summation.
Note (2): Determined using the corresponding fitting method
Note (3): When the local noise exceeds the fitting uncertainty, the
larger value was used
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh 2dFGRS right ascension (J2000)
4- 5 I2 min RAm 2dFGRS right ascension (J2000)
7- 11 F5.2 s RAs 2dFGRS right ascension (J2000)
13 A1 --- DE- 2dFGRS declination sign (J2000)
14- 15 I2 deg DEd 2dFGRS declination (J2000)
17- 18 I2 arcmin DEm 2dFGRS declination (J2000)
20- 23 F4.1 arcsec DEs 2dFGRS declination (J2000)
25- 34 A10 --- 2dFGRS 2dFGRS (VII/226) name
35 A1 --- n_2dFGRS [a] upper limit (1)
37- 42 F6.4 --- z ? 2dFGRS Redshift
44- 48 F5.2 mag Bjmag Final Bj magnitude used in 2dFGRS
50 I1 --- q_z [1/5] 2dFGRS redshift measurement quality (G1)
52- 55 A4 --- Class Visual spectral classification (G2)
58- 62 F5.3 mJy UL 3σ upper limit
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Note (1): 'a' indicates a radio upper limit represented by the average
of the nearest four pixels to the 2dFGRS position
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Global notes:
Note (G1): The 2dFGRS redshift quality (Q) ranges from '1' for unlikely/poor
quality spectra to '5' indicating a secure redshift
Note (G2): Visual spectral classification use the following abbreviations:
abs = absorption-line spectrum
em = emission-line spectrum with dominant forbidden lines (e.g. [OIII])
a+e = combined absorption- and emission-line spectrum
SF = emission-line spectrum with dominant recombination lines
(e.g. Hα)
??? = spectrum with inadequate signal-to-noise ratio (S/N) or
otherwise unclassifiable
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Feb-2005