J/MNRAS/306/708 The Phoenix Survey (Georgakakis+, 1999)
The Phoenix Survey:
optical and near-infrared observations of faint radio sources.
Georgakakis A., Mobasher B., Cram L., Hopkins A., Lidman C.,
Rowan-Robinson M.
<Mon. Not. R. Astron. Soc. 306, 708 (1999)>
=1999MNRAS.306..708G 1999MNRAS.306..708G
ADC_Keywords: Galaxies, radio ; Galaxies, photometry ; Redshifts ;
Equivalent widths
Keywords: surveys - galaxies: active - galaxies: starburst -
cosmology: observations - radio continuum: galaxies
Abstract:
Using a deep Australia Telescope Compact Array (ATCA) radio survey
covering an area of ∼3deg2 to a 4σ sensitivity of ≥100mmJy at
1.4GHz, we study the nature of faint radio galaxies. About 50 per cent
of the detected radio sources are identified with an optical
counterpart revealed by CCD photometry to m_R=22.5mag. Near-infrared
(K-band) data are also available for a selected sample of the radio
sources, while spectroscopic observations have been carried out for
about 40 per cent of the optically identified sample. These provide
redshifts and information on the stellar content. Emission-line ratios
imply that most of the emission-line sources are star-forming
galaxies, with a small contribution (∼10 per cent) from Sy1/Sy2 type
objects. We also find a significant number of absorption-line systems,
likely to be ellipticals. These dominate at high flux densities
(>1mJy) but are also found at sub-mJy levels. Using the Balmer
decrement we find a visual extinction AV=1.0 for the star-forming
faint radio sources. This moderate reddening is consistent with the
V-R and R-K colours of the optically identified sources. For
emission-line galaxies, there is a correlation between the radio power
and the Halpha luminosity, in agreement with the result of Benn et al.
(1993MNRAS.263....9B 1993MNRAS.263....9B). This suggests that the radio emission of
starburst radio galaxies is a good indicator of star formation
activity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 128 246 Properties of the faint radio source catalogue
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See also:
VIII/57 : Fluxes of Faint Radio Sources at 2.7/4.75 GHz (Forkert+, 1987)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [GMC99b] Sequential number ([GMC99b] NNN in Simbad)
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 16 F6.3 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31- 35 F5.2 mag Vmag ? V magnitude
37- 41 F5.2 mag Rcmag ? Cousins R magnitude
43- 47 F5.2 mag Kmag ? K magnitude
49- 54 F6.3 mJy S1.4GHz Radio flux density at 1.4GHz
56- 59 F4.2 mag V-Rc ? Cousins V-Rc colour index
61- 64 F4.2 mag e_V-Rc ? rms uncertainty on V-Rc
66- 69 F4.2 mag Rc-K ? Cousins R-Kc colour index
71- 74 F4.2 mag e_Rc-K ? rms uncertainty on R-Kc
76- 80 F5.3 --- z Redshift
82 I1 --- q_z [0/3] Redshift estimate quality parameter (1)
84- 88 F5.2 [W/Hz] logP1.4GHz ? log10 of radio luminosity at 1.4GHz
90- 95 F6.2 mag RMAG ? Absolute R magnitude
97-101 F5.2 [W] logLHa ? log10 Hα luminosity
103-105 I3 0.1nm EWHa ? Rest-frame Hα equivalent width
107-108 I2 0.1nm e_EWHa ? rms uncertainty on EWHa
110-112 I3 0.1nm EW[OII] ? Rest-frame [O II]3727 equivalent width
114-115 I2 0.1nm e_EW[OII] ? rms uncertainty on EW[OII]
117-128 A12 --- Class Spectral classification
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Note (1): Quality values are:
-- a value Q=3 corresponds to three or more identified spectral features,
indicating a firmly established redshift.
-- a value Q=0, 1 and 2 corresponds to zero (no redshift determination),
one and two identified spectral features respectively.
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 25-Apr-2000