Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/449/527    Galaxies in the zone of avoidance              (Lu+ 1995)

Large-scale structures in the zone of avoidance: the galactic anticenter region Lu N.Y., Freudling W. <Astrophys. J. 449, 527 (1995)> =1995ApJ...449..527L
ADC_Keywords: Galaxies, IR ; Infrared sources ; H I data Keywords: galaxies: clustering - galaxies: distances and redshifts - radio lines: galaxies Abstract: We have selected a sample of 876 galaxy candidates from the IRAS Point Source Catalog in the region of 2h<RA<10h and 0deg<DE<36deg, which crosses the Galactic anticenter part of the Zone of Avoidance (ZOA) and includes most of the highly obscured Orion-Taurus complex region. We have identified galaxies among the candidate sources by attempting to detect the 21cm H I line of those sources which were not known to be galaxies at the beginning of the survey. In this manner, we constructed a galaxy sample which is largely free from Galactic reddening. Of the 272 observed candidates, 89 were detected in the H I line up to a heliocentric velocity of vh∼16,000km/s. The resulting galaxy sample of 717 galaxies is fairly complete (within about 10%) and uniform (within about 4%) in the part of the survey area 10deg away from the Galactic plane and for velocities up to at least 9000km/s. This provides, for the first time, a largely unbiased view on the large-scale structures in much of the survey area. Our main results are the following: (1) Several large voids are identified. In particular, a void between RA∼3h and 4h, up to vh∼6000km/s, separates the Pisces-Perseus supercluster at RA<3h from structures at RA>4h; and a "nearby void" occupies most of our survey area and reaches out to a redshift of nearly 3000km/s. (2) We found no nearby galaxy concentration that could significantly contribute to the "Local Velocity Anomaly" (LVA), but a general excess of galaxies around vh∼5000km/s in the survey area. (3) The contrast between the "Great Wall" at vh∼8500km/s and the void in front of it appears to gradually diffuse out after it enters the Zone of Avoidance from the northern Galactic hemisphere. (4) Our data combined with other galaxy surveys in or near the Galactic anticenter part of the ZOA suggest that the main ridge of the Pisces-Perseus supercluster does also not extend to Abell 569, a cluster in the northern Galactic hemisphere, and that the simple gravitational model consisting of the Local Void of Tully & Fisher, our nearby void, and Puppis and Fornax-Eridanus clusters would predict a LVA whose direction is probably too far away from that derived from observations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 30 899 List of the candidate sources table3.dat 55 89 HI 21cm data of the detected galaxies
See also: II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- IRAS IRAS-PSC (Cat. II/125) name 11 A1 --- m_IRAS [AB] Multiplicity index on IRAS 12 A1 --- n_IRAS [*] Note on IRAS (1) 13- 15 I3 deg GLAT Galactic latitude 17 I1 --- n1 [1/3] Object category (2) 19 I1 --- n2 [0/2] HI velocity in range [0/8000] (3) 21 I1 --- n3 [0/1] HI velocity in range [8000/16000] (4) 23- 27 I5 km/s HV ? Heliocentric velocity 29- 30 I2 --- Ref [1/11]? References (5)
Note (1): An * indicates PSC sources which fail to pass our selection criteria. Note (2): Categories numbered as follows: 1 = Catalogued galaxies, i.e., sources flagged in the PSC to be associated with one or more optical galaxy catalogs 2 = Galactic sources (as marked in the PSC) 3 = pure IRAS source Note (3): A nonzero number indicates that the source was observed in one of the two similar 21cm HI surveys over a velocity coverage of (0-8000)km/s, where 1=the current survey and 2=Lu et al. (1990ApJ...357..388L) Note (4): An index of unity means that the source was observed in the current survey over a velocity coverage of (8000-16000)km/s Note (5): Reference that gives either the original redshift or identification, or the original work of the redshift or identification, as follows: 1 = this paper 2 = Lu et al. (1990ApJ...357..388L) 3 = Pantoja et al. (1994AJ....108..921P) 4 = Giovanelli & Haynes (1993, Cat. J/AJ/105/1271) 5 = the Third References Catalogue of Galaxies, de Vaucouleurs et al., 1991, Cat. VII/155 6 = the NASA/IPAC Extragalactic Database (Helou et al., 1991, in "Database and On-Line Data in Astronomy", ed. M.A. Albrecht & D. Egret (Dordrecht: Kluwer), 89) 7 = Strauss et al. (1992, Cat. II/174) 8 = IRAS-1,2Jy redshift catalog (Strauss 1994 (Priv. Comm.), see also Fisher et al. 1992ApJ...389..188F) 9 = the 1-in-6 redshift catalog of the Queen Mary-West Field College, Durham, Oxford, and Toronto (Lawrence et al. 1994, preprint) 10 = Takata et al. (1994, Cat. J/A+AS/104/529) 11 = the catalog of IRAS point source redshift survey (Saunders 1994 (Priv. Comm.), see also Rowan-Robinson et al. (1991MNRAS.253..485R)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- IRAS IRAS name (note that 04425+1058 is not in table2) 11 A1 --- m_IRAS [AB] Multiplicity index on IRAS 13- 17 I5 km/s HV50 Mean heliocentric velocity, taken to be the middle point between the velocities at the flux level 50% of the peak(s) on either side of the profile 19 A1 --- l_Wm20 Limit flag on Wm20 20- 22 I3 km/s Wm20 Velocity width at 20% of the mean flux density within the profile 24 A1 --- l_Wm50 Limit flag on Wm50 25- 27 I3 km/s Wm50 Velocity width at 50% of the mean flux density within the profile 30- 32 I3 km/s Wp20 ? Velocity width at 20% of the peak(s) 35- 37 I3 km/s Wp50 ? Velocity width at 50% of the peak(s) 40- 42 I3 km/s Wp80 ? Velocity width at 80% of the peak(s) 44- 48 F5.2 SHI Integrated HI flux 50- 54 F5.2 --- S/N Observed ratio of peak signal-to-noise 55 I1 --- Notes ? Notes about the HI observation (1)
Note (1): Notes as follows: 1 = Widths are ambiguous 2 = The galaxy was detected in the OFF spectrum taken at the same declination as the ON position but at an R.A. that is 117.0' east of the ON position 3 = The peak widths are probably incorrect 4 = Possibly two galaxies along the line of sight 5 = The high-velocity wing of the profile is slightly beyond our limiting velocity 6 = The galaxy was detected in the OFF spectrum taken at the same declination as the ON position, but at an R.A. that is 91.8' east of the ON position 7 = The galaxy was detected in the OFF spectrum taken at the same declination as the ON position, but at an R.A. that is 109.5' east of the ON position
History: * 01-Apr-1997: Prepared via OCR at CDS. * 09-Jan-2013: standardized documentation and fixed 3 names in table3 in error from OCR process: 02249+2710 (02249+2740), 02569+1020 (02569+1022), 03459+1255 (03459+1259). * 14-Jan-2013: further OCR errors detected by H. Andernach [Guanajuato Univ.] in tables 2 and 3 (sign of GLAT in table2, missing notes in table3)
(End) James Marcout, Patricia Bauer [CDS] 01-Apr-1997
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

catalogue service