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J/MNRAS/249/218 Group of quasars (Clowes+, 1991)
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A 100-200 Mpc group of quasars
Clowes R.G., Campusano L.E.
<Mon. Not. R. Astron. Soc. 249, 218 (1991)>
=1991MNRAS.249..218C (SIMBAD/NED Reference)
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ADC_Keywords: QSOs ; Redshifts
Abstract:
We have found evidence for a large, elongated group of at least
ten quasars with largest dimension ~100-200h-1Mpc at z~1.3, in
the direction of ESO/SERC field 927, which has the field centre
(1950) 10h40m00s, 05deg00'00". There are probably further members
that have not yet been observed. The morphology of the group seems
to be like a clump, but there might be some sub-grouping on scales
~20h-1Mpc. The group is similar in size and number of quasars to
that found by Crampton, Cowley & Hartwick (1989).
The fact that two such groups are now known is evidence that the
distribution of quasars is not so simple as was previously thought:
at large scales (>10h-1Mpc) the majority of quasars may be distributed
uniformly and at random, but rare, large groups also occur.
The groups may be large physical structures, but a strong association
with the large structures of galaxies seems doubtful.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 70 61 S and W bands of quasars
table2 32 22 Collation of redshifts data
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1 A1 --- Band [SW] Band designation
S= strong-lined, W=weak-lined
3- 4 I2 h RAh Right ascension (1950)
6- 7 I2 min RAm Right ascension (1950)
9- 12 F4.1 s RAs Right ascension (1950)
14- 15 I2 deg DEd Declination (1950)
17- 18 I2 arcmin DEm Declination (1950)
20- 21 I2 arcsec DEs Declination (1950)
24- 29 F6.4 --- LSP Automated Quasar Detection (AQD) line-strength
parameter
32- 36 F5.3 --- z Redshift
37 A1 --- n_z [k] Note on redshift (1)
39- 58 A20 --- Line Line
61- 63 I3 0.1nm EW []? Equivalent width
66- 70 F5.2 mag Bj []? Bj magnitude
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Note (1): Redshifts from Keable (1987) are identified by k
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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2- 3 I2 h RAh Right Ascension (1950)
5- 6 I2 min RAm Right Ascension (1950)
8- 11 F4.1 s RAs Right Ascension (1950)
13- 14 I2 deg DEd Declination (1950)
16- 17 I2 arcmin DEm Declination (1950)
19- 20 I2 arcsec DEs Declination (1950)
22- 26 F5.3 --- z Redshift
28- 32 F5.2 mag Bj []? Bj magnitude
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Historical Notes: Keypunched at CDS
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(End) James Marcout, Simona Mei [CDS] 28-Feb-1995