J/ApJ/471/L5 Redshift clustering in the Hubble Deep Field (Cohen+ 1996)
Redshift clustering in the Hubble Deep Field.
Cohen J.G., Cowie L.L., Hogg D.W., Songaila A., Blandford R., Hu E.M.,
Shopbell P.
<Astrophys. J. 471, L5 (1996)>
=1996ApJ...471L...5C 1996ApJ...471L...5C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Redshifts
Keywords: cosmology: observations - galaxies: distances and redshifts -
large-scale structure of universe
Abstract:
We present initial results from a redshift survey carried out with the
low-resolution imaging spectrograph on the 10m W. M. Keck Telescope in
the Hubble Deep Field. In the redshift distribution of the 140
extragalactic objects in this sample, we find six strong peaks with
velocity dispersions of ∼400km/s. The areal density of objects within
a particular peak, while it may be nonuniform, does not show evidence
for strong central concentration. These peaks have characteristics
(velocity dispersions, density enhancements, spacing, and spatial
extent) similar to those seen in a comparable redshift survey in a
different high Galactic latitude field (Cohen and coworkers),
confirming that the structures are generic. They are probably the
high-redshift counterparts of huge galaxy structures ("walls")
observed locally.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 34 152 Redshifts in the Hubble deep field
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See also:
J/AJ/112/359 : Galaxies in the Hubble Deep Field (van den Bergh+ 1996)
J/AJ/112/1335 : Hubble Deep Field observations (Williams+ 1996)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13- 14 I2 deg DEd Declination (J2000)
16- 17 I2 arcmin DEm Declination (J2000)
19- 22 F4.1 arcsec DEs Declination (J2000)
24- 27 F4.1 mag Rmag ? Crude ground-based R magnitude in a 3"
diameter intended for object identification only
29- 34 F6.4 --- z Redshift
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Table 2: Redshift peaks in the Hubble deep field
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(1) (2) (3) (4) (5) (6)
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0.321 8 170 22 0.22 2.0
0.457 7 310 10 0.31 1.7
0.475 15 315 21 0.31 1.6
0.516 8 595 8 0.33 1.6
0.559 14 420 21 0.34 1.5
0.680 5 265 8 0.40 1.4
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(1): Peak redshift
(2): Number of galaxies within the peak, as determined by statistical tests.
(3): Velocity dispersion σ(N), in km/s. No correction for instrumental
or measurement errors has been applied.
(4): Statistical parameter for estimating the significance of each peak;
see Cohen et al. (1996ApJ...462L...9C 1996ApJ...462L...9C).
(5): Comoving transverse size corresponding to 1' in h-1Mpc
(6): Comoving radial distance corresponding to {DELTA}z=0.001 in h-1Mpc
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Table 3: Areal density of peaks in the Caltech zero-hour field and in
local structures
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zp Nobs(L>0.1L*) Comoving Area ncorr(L>0.1L*)a σv(N-1)
(h-2Mpc2) (h2Mpc-2) (km/s)
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0.392 3 1.03 3 465
0 429 14 1.19 13 615
0 581 23 1.86 19 410
0 675 8 2.30 7 405
0 766 7 2.72 7 670
0.475(HDF)b 7 0.51 18 315
0.559(HDF)b 7 0.64 17 420
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Local Structures
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Local Group 4 1.3 3c < 100
Virgod 122 8.5 14c 670e
Comaf 248 2.0 125 1080g
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Notes: a : Comoving areal density corrected for incompleteness at the faint end.
b : The area is that of the three Wide-Field CCDs.
c : Independent of h.
d : Galaxies within a 6D radius of the cluster center.
c : Bingelli, Sandage, & Tammann (1985AJ.....90.1681B 1985AJ.....90.1681B).
f : Galaxies within the central region 1D2 on a side.
g : Colless & Dunn (1996ApJ...458..435C 1996ApJ...458..435C) (square region 2D6 on a side).
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 28-Aug-1997