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J/A+AS/127/463 Crux region redshifts (Fairall+ 1998)
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Extragalactic Large-Scale Structures behind the Southern Milky Way.
II. Redshifts Obtained at the SAAO in the Crux region
Fairall A.P., Woudt P.A., Kraan-Korteweg R.C.
<Astron. Astrophys. Suppl. Ser. 127, 463 (1998)>
=1998A&AS..127..463F (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Redshifts ; Radial velocities
Keywords: galaxies: redshifts - galaxies: clusters of -
large-scale structure of the Universe
Abstract:
In our systematic optical galaxy search behind the southern Milky Way,
3760 (mostly unknown) galaxies with diameters D>0.2' were identified
in the Crux region (287{deg}<~l<~318{deg}, |b|<~10{deg}, Woudt &
Kraan-Korteweg 1998, in press). Prior to this investigation, only 65
of these galaxies had known redshifts. In order to map the galaxy
distribution in redshift space we obtained spectra for 226 bright
(B_J_<~18.0mag) objects with the 1.9m telescope of the South African
Astronomical Observatory (SAAO). Redshifts could be determined for 209
objects, of which 173 have good signal-to-noise ratios. Of the 36
tentative redshifts, four are confirmed through independent values in
the literature. The redshifts of three objects indicate them to be
galactic in origin. One of these confirms a suspected Planetary
Nebula. For 17 of the galaxies, no redshift could be determined due to
poor signal-to-noise ratios. In addition, 26 redshifts have have been
measured in the Hydra-Antlia region investigated earlier
(Kraan-Korteweg et al., 1995, Cat. <J/A+A/297/617>), of which one is a
tentative estimate. Two main structures crossing the Galactic Plane in
the Crux region have now become clear. A narrow, nearby filament from
(l, b)=(340{deg}, -25{deg}) to the Centaurus cluster can be traced.
This filament runs almost parallel to the extension of the
Hydra-Antlia clusters found earlier and is part of what we have
earlier termed the ``Centaurus Wall'' extending in redshift-space
between 0<=v<=6000km/s (Fairall & Paverd 1995, in Wide-Field
Spedctroscopy and the Distant Universe, p. 121). The main outcome of
this survey however, is the recognition of another massive extended
structure between 4000<=v<=8000km/s. This broad structure, dubbed the
Norma Supercluster (Woudt et al. 1997, in press), runs nearly parallel
to the Galactic Plane from Vela to ACO 3627 (its centre) from where it
continues to the Pavo cluster. This massive structure is believed to
be associated with the Great Attractor. The survey has furthermore
revealed a set of cellular structures, similar to those seen in
redshift space at higher galactic latitudes, but never before seen so
clearly behind the Milky Way.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 116 209 Redshifts of galaxies in the ZOA obtained at the SAAO
table2.dat 117 26 Redshifts of galaxies in the ZOA (Hydra-Antlia
region) obtained at the SAAO
table3.dat 92 17 Galaxies observed at the SAAO without reliable
redshift
table4.dat 94 51 Galaxies in our survey region with velocities
from the literature
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See also:
VII/34 : ESO/Uppsala Survey of the ESO(B) Atlas (Lauberts 1982)
J/A+A/297/617 : Hydra/Antlia extension redshifts (I) (Kraan-Korteweg+, 1995)
J/A+A/352/39 : Great Attractor region redshifts (III) (Woudt+, 1999)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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2- 9 A8 --- WKK98 Identification of the galaxy in the Catalogues
of Woudt and Kraan-Korteweg, 1998 (1)
11- 18 A8 --- ESO Identification in Lauberts Catalogue (1982,
Cat. <VII/34>)
20- 21 I2 h RAh Right ascension (B1950)
23- 24 I2 min RAm Right ascension (B1950)
26- 29 F4.1 s RAs Right ascension (B1950)
31 A1 --- DE- Declination sign
32- 33 I2 deg DEd Declination (B1950)
35- 36 I2 arcmin DEm Declination (B1950)
38- 39 I2 arcsec DEs Declination (B1950)
42- 47 F6.2 deg GLON Galactic longitude
49- 54 F6.2 deg GLAT Galactic latitude
57- 59 I3 arcsec MajAxis Major axis
61- 63 I3 arcsec MinAxis Minor axis
65- 68 F4.1 mag Bmag ? B magnitude estimated from the
IIIaJ ESO/SRC film copy
70- 74 A5 --- MType Morphological type
77- 81 I5 km/s HVa ? Heliocentric velocity from absorption
line features
83- 85 I3 km/s e_HVa ? Error to absorption velocity
86 A1 --- n_HVa Note on HVa (]: tentative redshift)
89- 93 I5 km/s HVe ? Heliocentric velocity from emission
line features
95- 97 I3 km/s e_HVe ? Error of emission velocity
98 A1 --- n_HVe Note on HVe (]: tentative redshift)
100 I1 --- Code1 [1/6]? Code for identified emission line (2)
101 A1 --- u_Code1 [:] ":" : identification is tentative
102 I1 --- Code2 [2/7]? Code for identified emission line (2)
103 A1 --- u_Code2 [:] ":" : identification is tentative
104 I1 --- Code3 [3/7]? Code for identified emission line (2)
105 A1 --- u_Code3 [:] ":" : identification is tentative
106 I1 --- Code4 [4/7]? Code for identified emission line (2)
108 I1 --- Code5 [5/7]? Code for identified emission line (2)
110 I1 --- Code6 [6/7]? Code for identified emission line (2)
113-115 A3 --- Rem Code for remarks to table 1 (3)
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Note (1): In table1.dat, Name as in "A Catalogue of 3760 Galaxies in the Zone of
Avoidance in the Crux region (Woudt & Kraan-Korteweg, 1998, in press)
In table2.dat, Name as in "A Catalogue of 3279 Galaxies in the Zone of
Avoidance in the Hydra/Antlia Extension (Kraan-Korteweg, 1998, in
press)
Note (2): 1: [OII] 3727
2: Hgamma 4340
3: Hbeta 4861
4: [OIII] 4959
5: [OIII] 5007
6: Halpha 6563
7: [NII] 6584
Note (3): *: Redshifts are also available in the literature
#: These galaxies are not in our search area, but do lie in the
``Zone of Avoidance''. The diameters and type are from
Lauberts 1982
1: WKK 150: The redshift measured at the SAAO for this galaxy is
in disagreement with the value quoted in the literature
(v=8948+/-40km/s, Fisher et al., 1995, Cat. <VII/185>). It might
be due to an identification error; a neighbouring galaxy (WKK 158)
was found to be in good agreement with the value quoted in the
literature.
2: The redshifts for these galaxies are tentative only, but confirmed
by independent redshifts from the literature
3: KK1196: The redshift measured at the SAAO for this galaxy is
in slight disagreement with the value quoted in the literature
(v=2411km/s, Huchtmeier and Richter, 1989, The General Catalogue
of HI-Observations og Galaxies. New York: Springer-Verlag)
4: L216- 5: The redshift measured at the SAAO for this galaxy is
in slight disagreement with the value quoted in the literature
(v=6350km/s, Visvanathan and v.d. Bergh, 1992AJ....103.1057V)
Gal: Identification as galaxy questionable, spectra indicates
a galactic origin
PN: WKK P8: This object was classified as a possible PN, but was not
listed in PNe list of Acker (1992, Cat. <V/84>). It has now been
confirmed as a PN
Sy2: These four galaxies have been classified as Seyfert 2
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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2- 9 A8 --- WKK98 Identification of the galaxy in the catalogue
of Woudt and Kraan-Korteweg, 1998 (1)
11- 18 A8 --- ESO Identification in Lauberts Catalogue (1982,
Cat. <VII/34>)
20- 21 I2 h RAh Right ascension (B1950)
23- 24 I2 min RAm Right ascension (B1950)
26- 29 F4.1 s RAs Right ascension (B1950)
31 A1 --- DE- Declination sign
32- 33 I2 deg DEd Declination (B1950)
35- 36 I2 arcmin DEm Declination (B1950)
38- 39 I2 arcsec DEs Declination (B1950)
42- 47 F6.2 deg GLON Galactic longitude
49- 54 F6.2 deg GLAT Galactic latitude
57- 59 I3 arcsec MajAxis Major axis
61- 63 I3 arcsec MinAxis Minor axis
65- 68 F4.1 mag Bmag B magnitude estimated from the IIIaJ ESO/SRC
film copy
70- 74 A5 --- MType Morphological type
77- 88 A12 --- Rem Remark describing reason for non-detection
of velocity
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Note (1): Name as in "A Catalogue of 3760 Galaxies in the Zone of Avoidance in
the Crux region (Woudt and Kraan-Korteweg, 1998, in press)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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2- 9 A8 --- WKK98 Identification of the galaxy as in
A Catalogue of 3760 Galaxies in the Zone of
Avoidance in the Crux region
(Woudt and Kraan-Korteweg, 1998, in press)
11- 18 A8 --- ESO Identification in Lauberts Catalogue (1982,
Cat. <VII/34>)
20- 21 I2 h RAh Right ascension (B1950)
23- 24 I2 min RAm Right ascension (B1950)
26- 29 F4.1 s RAs Right ascension (B1950)
31 A1 --- DE- Declination sign
32- 33 I2 deg DEd Declination (B1950)
35- 36 I2 arcmin DEm Declination (B1950)
38- 39 I2 arcsec DEs Declination (B1950)
42- 47 F6.2 deg GLON Galactic longitude
49- 54 F6.2 deg GLAT Galactic latitude
57- 59 I3 arcsec MajAxis Major axis
61- 63 I3 arcsec MinAxis Minor axis
65- 68 F4.1 mag Bmag ? B magnitude estimated from the
IIIaJ ESO/SRC film copy
70- 74 A5 --- MType Morphological type
77- 81 I5 km/s HV ? Heliocentric velocity
83- 85 I3 km/s e_HV ? Error to heliocentric velocity
90 I1 --- r_HV [1/6] Code for source of the velocity (1)
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Note (1): 1: Dressler 1991, Cat. <J/ApJS/75/241>
The supergalactic plane redshift survey
2: Strauss et al., 1992ApJS...83...29S,
A redshift survey of IRAS galaxies
3: Visvanathan and v.d. Bergh, 1992AJ....103.1057V,
Luminous spiral galaxies in the direction of the Great Attractor
4: Fairall, 1983MNRAS.203...47F, Spectroscopic survey of southern
compact and bright-nucleus galaxies
5: Fisher et al. 1995, Cat. <VII/185>, The IRAS 1.2 Jy Survey
6: Fairall 1996, The Southern Redshift Catalogue (See Cat. <VII/142>)
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Acknowledgements: Tony Fairall <fairall@uctvms.uct.ac.za>
References:
Woudt and Kraan-Korteweg, 1998, A Catalogue of 3760 Galaxies in the Zone of
Avoidance in the Crux region (in press)
Kraan-Korteweg, 1998, A Catalogue of 3279 Galaxies in the Zone of Avoidance
in the Hydra/Antlia Extension (in press)
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(End) Patricia Bauer [CDS] 05-Jan-1998