J/MNRAS/344/283 100-Mpc-scale structures of radio galaxies (Brand+, 2003)
Two 100-Mpc-scale structures in the three-dimensional distribution of
radio galaxies and their implications.
Brand K., Rawlings S., Hill G.J., Lacy M., Mitchell E., Tufts J.
<Mon. Not. R. Astron. Soc. 344, 283 (2003)>
=2003MNRAS.344..283B 2003MNRAS.344..283B
ADC_Keywords: Clusters, galaxy ; Active gal. nuclei ; Galaxies, radio ;
Redshifts
Keywords: galaxies: active - cosmology: observations -
large-scale structure of Universe - radio continuum: galaxies
Abstract:
We present unequivocal evidence for a huge (∼80x100x100Mp3)
superstructure at redshift z=0.27 in the three-dimensional
distribution of radio galaxies from the Texas-Oxford NVSS Structure
08h region (TONS08) sample, confirming tentative evidence for such a
structure from the 7C redshift survey (7CRS). A second, newly
discovered superstructure is also found less securely at redshift 0.35
(of dimensions ∼100x100x100Mpc3). We present full observational
details on the TONS08 sample which was constructed to probe structures
in the redshift range 0<z<0.5 by matching NVSS sources with objects
in APM catalogues to obtain a sample of optically bright (E∼R≤19.83),
radio-faint (1.4GHz flux density S1.4≥3mJy) radio galaxies in the
same 25deg2 area as part II of the 7CRS.
Description:
The TONS08 survey is in one of the areas covered by the 7CRS (Willott
et al., 2002MNRAS.335.1120W 2002MNRAS.335.1120W) and the TexOx-1000 (TOOT) survey (Hill &
Rawlings, 2002, ASP Conf. Proc., Leiden. Astron. Soc. Pac., San
Francisco). It covers the region 08h 10m 20s ≤ RA ≤ 08h 29m 20s and
24° 10' 00" ≤ DE≤ 29° 30' 00" (J2000). Unlike the
low-frequency-selected 7CRS and TOOT, the TONS08 survey is selected at
1.4GHz from the NVSS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 137 84 A summary of key information on the TONS08 sample
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/71 : The FIRST Survey, version 03Apr11 (Becker+ 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [TONS08]
8- 11 I4 --- TONS08 TONS08 number
12 A1 --- m_TONS08 [ab] Multiplicity index on TONS08 (1)(2)
13 A1 --- n_TONS08 [*] *: Note on TONS08 288 (3)
14- 21 A8 --- Tel Telescope (4)
23- 32 A10 "YYYY/MM/DD" Date Observation date
33 A1 --- --- [-]
34- 43 A10 "YYYY/MM/DD" Date2 Second observation date when interval
45- 46 I2 h RAh Right ascension (J2000) (1)
48- 49 I2 min RAm Right ascension (J2000) (1)
51- 55 F5.2 s RAs Right ascension (J2000) (1)
57 A1 --- DE- Declination sign (J2000) (1)
58- 59 I2 deg DEd Declination (J2000) (1)
61- 62 I2 arcmin DEm Declination (J2000) (1)
64- 68 F5.2 arcsec DEs Declination (J2000) (1)
70- 75 F6.1 mJy SNVSS Integrated radio flux density in the NVSS
(Cat. VIII/65) catalog (1.4GHz)
77- 83 F7.2 mJy SFIRST ? Integrated radio flux density in the
FIRST (Cat. <VIII/71 >) catalog (2)
85- 89 F5.2 mag Omag Blue O magnitude (APM corrected magnitude)
91- 95 F5.2 mag Emag Red E magnitude (APM corrected magnitude)
97-101 F5.3 --- z Redshfit estimated by identifying lines by
eye and calculating the mean redshift
103-108 F6.4 --- zc ? Redshift obtained by cross-correlating
the spectra with the combined
deredshifted spectra
109 A1 --- n_zc [?] ? denotes that the cross-correlation
was unsuccessful
111-116 F6.4 --- zsed ? Redshfit obtained by cross-correlating
the spectra with the GISSEL model,
(Bruzual & Charlot, 1993ApJ...405..538B 1993ApJ...405..538B
118-137 A20 --- Note Notes (5)
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Note (1): The positions are that of the radio positions except in the
case of multiple sources where the positions are from APM.
Note (2): In cases where FIRST resolves out multiple components, SFIRST
is the total integrated flux density.
Note (3): The NVSS entry for TONS08 288 seems to be the confusion of two
separate radio sources - the given redshift is for the ID of the
brighter, double-lobed radio source, but both sources have APM IDs.
We are awaiting spectroscopic confirmation that the other object is
at a similar redshift.
Note (4): Telescopes:
NOT: 2.6-m Nordic Optical Telescope
WHT: 4.2-m William Herschel telescope
2.7: 2.7-m Smith reflector at McDonald
Note (5): The notes denote the name of the object in other samples or
lines identified.
Spectra of the TOOT objects will be presented in Rawlings et al. (in
preparation); Spectra for the 7CRS objects can be found in Willott et
al. (2002MNRAS.335.1120W 2002MNRAS.335.1120W). The redshift of 3C200 is reported in Laing,
Riley & Longair (1983MNRAS.204..151L 1983MNRAS.204..151L).
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 25-Sep-2003