J/AJ/148/75 Bent-tailed radio galaxies Chandra Deep Field South (Dehghan+, 2014)
Bent-tailed radio sources in the Australia Telescope Large Area Survey of
the Chandra Deep Field-South.
Dehghan S., Johnston-Hollitt M., Franzen T.M.O., Norris R.P., Miller N.A.
<Astron. J., 148, 75 (2014)>
=2014AJ....148...75D 2014AJ....148...75D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Morphology ; H I data
Keywords: galaxies: active - galaxies: jets - radio continuum: galaxies -
surveys
Abstract:
Using the 1.4GHz Australia Telescope Large Area Survey, supplemented
by the 1.4GHz Very Large Array images, we undertook a search for
bent-tailed (BT) radio galaxies in the Chandra Deep Field South. Here
we present a catalog of 56 detections, which include 45 BT sources,
4 diffuse low-surface-brightness objects (1 relic, 2 halos, and
1 unclassified object), and a further 7 complex, multi-component
sources. We report BT sources with rest-frame powers in the range
1022≤P_1.4 GHz_≤1026W/Hz, with redshifts up to 2 and
linear extents from tens of kiloparsecs up to about 1Mpc. This is the
first systematic study of such sources down to such low powers and
high redshifts and demonstrates the complementary nature of searches
in deep, limited area surveys as compared to shallower, large surveys.
Of the sources presented here, one is the most distant BT source yet
detected at a redshift of 2.1688. Two of the sources are found to be
associated with known clusters: a wide-angle tail source in A3141 and
a putative radio relic which appears at the infall region between the
galaxy group MZ 00108 and the galaxy cluster AMPCC 40. Further
observations are required to confirm the relic detection, which, if
successful, would demonstrate this to be the least powerful relic yet
seen with P1.4GHz=9x1022W/Hz. Using these data, we predict
future 1.4GHz all-sky surveys with a resolution of ∼10 arcsec and a
sensitivity of 10µJy will detect of the order of 560,000 extended
low-surface-brightness radio sources of which 440,000 will have a BT
morphology.
Description:
Radio data were provided by the first and third ATLAS data release,
with about 17"x 7" resolution at 1.4GHz over the 4 deg2 field
surrounding the ECDFS (Norris et al., 2006, Cat. J/AJ/132/2409;
Franzen et al., 2015, Cat. J/MNRAS/453/4020).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 118 56 List of detected sources and their properties
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See also:
VII/250 : 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
J/A+AS/129/399 : The ENACS Catalogue. V. (Katgert+ 1998)
J/ApJ/707/1779 : BLAST: the redshift survey (Eales+, 2009)
J/ApJS/189/270 : MUSYC optical imaging in ECDF-S (Cardamone+, 2010)
J/AJ/132/2409 : Deep ATLAS radio observations of CDFS (Norris+, 2006)
J/MNRAS/453/4020 : ATLAS 1.4GHz Data Release 3 (Franzen+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/56] Sequential number
4- 17 A14 --- ATLAS ATLAS ID (1)
19- 48 A30 --- Name Name
50- 51 I2 h RAh Right ascension (J2000) (2)
53- 54 I2 min RAm Right ascension (J2000) (2)
56- 60 F5.2 s RAs Right ascension (J2000) (2)
62 A1 --- DE- Declination sign (J2000) (2)
63- 64 I2 deg DEd Declination (J2000) (2)
66- 67 I2 arcmin DEm Declination (J2000) (2)
69- 72 F4.1 arcsec DEs Declination (J2000) (2)
74- 79 F6.4 --- z ?=- Redshift
80 A1 --- n_z [f] Note on z (3)
81- 86 F6.2 mJy Flux Flux at 1.4GHz
88- 94 F7.3 10+24W/Hz P1.4GHz ?=- Rest-frame 1.4GHz luminosity
96- 98 I3 arcsec Size ?=- Angular size or lower value of angular
size interval
99 A1 --- --- [-]
100-101 I2 arcsec Size2 ? Upper value of angular size interval
104-106 I3 kpc Sizepc ?=- Linear size or lower value of linear
size interval
107 A1 --- --- [-]
108-110 I3 kpc Sizepc2 ?=- Upper value of linear size interval
112-116 A5 --- Type Type (4)
118 I1 --- Ref ?=- Reference (5)
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Note (1): IDs based on the ATLAS survey by Norris et al. (2006,
Cat. J/AJ/132/2409)
Note (2): Coordinates of the host galaxy as seen in the optical or infrared
images. In cases in which the host galaxies were not recognized, the ATLAS
coordinates are reported.
Note (3): f: The redshift is estimated by averaging the redshifts of two
nearby galaxies.
Note (4): Type code as follows:
1 = BT, bent-tailed
2 = WAT, wide-angle tail
3 = NAT, narrow-angle tail
4 = radio halo
5 = radio relic
6 = separated sources
Note that some sources could not be unambiguously classified due to poor
sensitivity or resolution and therefore are represented by multiple type
numbers. We note that the classification of BTs should encompass the
historical classifications of WATs and NATs as a subset and although the
WAT/NAT distinction is somewhat arbitrary, we include them here explicitly
to allow further comparison with the literature.
Note (5): References as follows:
1 = spectroscopic redshifts derived from the ENACS survey,
Katgert et al, 1998, Cat. J/A+AS/129/399
2 = spectroscopic redshifts derived from the 2dFGRS survey,
Colless et al., 2003, Cat. VII/250
3 = spectroscopic redshifts derived from the BLAST survey,
Eales et al., 2009, Cat. J/ApJ/707/1779
4 = spectroscopic redshifts derived from Mao et al. (2009MNRAS.392.1070M 2009MNRAS.392.1070M)
5 = photometric redshifts obtained from COMBO-17 survey,
Wolf et al., 2004, Cat. II/253
6 = photometric redshifts obtained from MUSYC survey,
Cardamone et al., 2010, J/ApJS/189/270
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Sep-2018