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J/MNRAS/316/326     Redshifts of Ophiuchus region galaxies    (Hasegawa+, 2000)

Large-scale structure of galaxies in the Ophiuchus region. Hasegawa T., Wakamatsu K.-I., Malkan M., Sekiguchi K., Menzies J.W., Parker Q.A., Jugaku J., Karoji H., Okamura S. <Mon. Not. R. Astron. Soc. 316, 326 (2000)> =2000MNRAS.316..326H
ADC_Keywords: Clusters, galaxy ; Redshifts Keywords: dust, extinction, large-scale structure of Universe, galaxies: clusters: individual: the Ophiuchus cluster Abstract: The large-scale structure around the Ophiuchus cluster of galaxies in the vicinity of the Galactic Centre (l=0.5°, b=9.5°, cz=8500km/s) is investigated on the basis of a galaxy survey and spectroscopic observations made for a 120°x170° area. The galaxy survey was performed using six ESO/SERC Sky Survey Atlas films, and 4021 galaxies were detected in total. Recession velocities were newly obtained for 179 galaxies to make the total number of galaxies in the survey area with known velocities 219. In the distribution of bright galaxies, we identified seven new clumps of galaxies. Comparing the surface number density of bright galaxies with the Galactic extinction, which is estimated from the 100-µm flux density in the IRAS Sky Survey Atlas, we demonstrate that the seven clumps are not spurious as a result of the inhomogeneity of the Galactic extinction. Among the seven clumps, two are found to be clusters and four to be groups on the basis of the histogram of recession velocities and the number of member galaxies. The Ophiuchus cluster, two newly identified clusters, and four groups are all concentrated at 9000km/s. Field galaxies are also distributed centred at 8500km/s. Hence field galaxies occupy a common three-dimensional region with galaxies in the clusters and groups, and altogether they form a large-scale structure of supercluster size. As opposed to the overdensity in the supercluster region, the mean number density of galaxies in the velocity range 0-5000km/s is only 25 per cent of the mean number density of the Universe, comparable with the density of the well-known Bootes void. Hence this nearby three-dimensional region in Ophiuchus is a void of galaxies also. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablec1.dat 86 219 Summary of the redshift data
See also: J/A+AS/110/269 : Galaxies in the "zone of avoidance". I. (Weinberger+, 1995) J/A+AS/117/1 : Galaxies in the "zone of avoidance". II. (Seeberger+, 1996) J/A+AS/117/369 : Galaxies in the "zone of avoidance". III. (Lercher+, 1996) J/A+AS/126/247 : Galaxies in the "zone of avoidance". IV. (Saurer+, 1997) J/A+AS/127/101 : Galaxies in the "zone of avoidance". V. (Seeberger+ 1998) J/A+AS/137/293 : ZOAG galaxies in 115°<l<157° (Weinberger+, 1999) Byte-by-byte Description of file: tablec1.dat
Bytes Format Units Label Explanations
1- 14 A14 --- OPH Identification name 16- 17 I2 h RAh Right ascension (J2000.0) 19- 20 I2 min RAm Right ascension (J2000.0) 22- 25 F4.1 s RAs Right ascension (J2000.0) 27 A1 --- DE- Declination sign (J2000.0) 28- 29 I2 deg DEd Declination (J2000.0) 31- 32 I2 arcmin DEm Declination (J2000.0) 34- 35 I2 arcsec DEs Declination (J2000.0) 37- 40 F4.2 arcmin Size ? Size of the object 42 I1 --- MC ? 5-step magnitude class (1) 44- 48 A5 --- MType Morphological type 50- 54 I5 km/s cz Redshift 56- 58 I3 km/s e_cz ? rms uncertainty on cz 60- 64 F5.2 MJy/sr f100 IRAS Sky Survey Atlas (ISSA) flux density in the object direction (2) 66- 86 A21 --- Name Cross-Identification of the object (3)
Note (1): 5-step magnitude class represent the total apparent magnitude of each galaxy. MCs run from 1 for the brightest galaxies to 5 for the faintest ones. Note (2): ISSA: Wheelock et al., 1994, IRAS Sky Survey Atlas Explanatory Supplement, JPL Publication 94-11, Pasadena Note (3): Cross-identifications: TJnn: Terzan & Ju (1980Msngr..20....6T), Terz N nn in Simbad Trznn: Terzan (1985Msngr..42....4T) or Terzan & Ounnas (1988, Cat. J/A+AS/76/205), Terz N nn in Simbad EnnnGnn: ESO (B) Catlaog (Lauberts, 1982, Cat. VII/34), ESO nnn-nn in Simbad nnnnn-nnnn: IRAS PSC (Cat. II/125), IRAS nnnnn-nnnn in Simbad MSH 17-205: Mills et al., 1960AuJPh..13..676M -------------------------------------------------------------------------------- Table 4. The list of seven clumps and two known clusters ----------------------------------------------------------- Clump RA (1950) DE f100 delta Ref ----------------------------------------------------------- cD 17 09 21 -23 20 48.1 49.1 1 II 16 58 31 -18 45 25.1 4.5 III 17 01 52 -20 05 26.4 5.6 IV 17 13 10 -19 42 31.6 5.2 V 17 19 52 -18 35 34.3 4.5 VI 17 12 34 -18 17 22.2 3.8 VII 17 00 51 -29 01 46.5 6.4 VIII 16 57 52 -28 17 47.9 6.7 Sag. 17 10 35 -25 07 40 55.7 1.0 2 ----------------------------------------------------------- Notes: f100 is the IIAS flus at 1000µm and delta the local enhancement Refs: 1 : Wakamatsu & Malkan (1981PASJ...33...57W) 2 : Djorgovski et al. (1990AJ....100..599D)
History: From MNRAS electronic version
(End) James Marcout, Patricia Bauer [CDS] 02-Oct-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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