CDROM/AJ/V112/P1803 Large Scale Structure (Marzke+ 1996) ================================================================================ Large-Scale Structure at Low Galactic Latitude Ronald O. Marzke, John P. Huchra and Margaret J. Geller <1996, AJ, 112, 1803> =1996AJ....112.1803M ================================================================================ Abstract: We have extended the CfA Redshift Survey to low galactic latitudes to investigate the relation between the Great Wall in the North Galactic Cap and the Perseus-Pisces chain in the South Galactic Cap. We present redshifts for 2020 galaxies in the Catalogue of Galaxies and of Clusters of Galaxies (Zwicky et al. 1961-68, CGCG) in the following regions: 4h <= R.A. <= 8h, 17h <= Dec. <= 20h, 0 deg <= Dec. <= 45 deg. In these regions, the redshift catalogue includes 1664 galaxies with B(0) <= 15.5 (of which 820 are newly measured) and is 97% complete. We also include redshifts for an additional 356 galaxies in these regions with B(0) > 15.5; of these, 148 were previously unmeasured. The CGCG samples the galaxy distribution down to b_(II) ~ 10 deg. In this paper, we discuss the acquisition and reduction of the spectra, and we examine the qualitative features of the redshift distribution. The Great Wall and the Perseus-Pisces chain are not simply connected across the Zone of Avoidance. These structures, which at first appear to be coherent on scales of ~100 h^(-1) Mpc or more, actually form the boundaries of neighboring voids of considerably smaller scale, approximately 50 h^(-1) Mpc. The structures delineated by our optically-selected sample are qualitatively similar to those detected by the far-infrared-selected IRAS 1.2 Jansky Survey (Fisher et al. 1995). Although the IRAS survey probes more deeply into the Zone of Avoidance, our optically-selected survey provides better sampling of structures at b_(II) >= 10 deg. (Copyright) 1996 American Astronomical Society. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table1.dat 97 1664 The Galactic Plane Survey [B(0)<=15.5] notes1.dat 38 66 Notes to table1.dat table2.dat 97 356 The Galactic Plane Survey [B(0)>=15.5] notes2.dat 38 12 Notes to table2.dat table3.dat 182 72 Velocity sources -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-12 A12 --- Name Source name 13-14 I2 h RAh Right Ascension (1950) 15 1X --- --- Always ':' 16-17 I2 min RAm R.A. 18 1X --- --- Always ':' 19-22 F4.1 s RAs R.A. 23 1X --- --- Blank 24 A1 --- DE- Sign, Declination 25-26 I2 deg DEd Declination (1950) 27 1X --- --- Always ':' 28-29 I2 arcmin DEm Dec. 30 1X --- --- Always ':' 31-32 I2 arcsec DEs Dec. 33-38 F6.1 mag m_zw Zwicky B(0) magnitude 39 1X --- --- Blank 40 A1 --- r_m_zw *Source code for m_zw (if not from CGCG) 41-47 I7 km/s Vh []? Heliocentric radial velocity, cz 48-52 I5 km/s e_Vh []? Error in Vh 53-54 2X --- --- Blank 55-58 A4 --- Source Redshift source code (see table3.dat) 59-60 2X --- --- Blank 61-62 A2 --- Morph *Morphological type 63 1X --- --- Blank 64 A1 --- Bar *Bar type 65 1X --- --- Blank 66 A1 --- Lum *Luminosity class 67 1X --- --- Blank 68 A1 --- Pec *Peculiarities 69-74 F6.1 arcmin D1 []? Major axis diameter 75-79 F5.1 arcmin D2 []? Minor axis diameter 80 1X --- --- Blank 81-85 A5 --- UGC UGC number 86-88 3X --- --- Blank 89-97 A9 --- Comments *Comments & references to other catalogues -------------------------------------------------------------------------------- Notes for file: table1.dat table2.dat -------------------------------------------------------------------------------- r_m_zw: Source code for magnitude if not from CGCG. "H" refers to magnitudes split by eye by JPH; "K" refers to magnitudes from Kirshner et al. (1978, AJ, 83, 1549; 1983, AJ, 88, 1285). Morph: Morphological types are de Vaucouleurs' T types from the RC2, Uppsala Catalog and the Revised Shapley-Ames Catalog. Some additional types have been defined for peculiar and un-typed objects and for objects that are in catalogues of extragalactic objects but are really galactic in nature. Additional types for galaxies in the CfA Redshift Survey region (described below) have been estimated by J. Huchra from glass copies of the Palomar Sky Survey. Types for southern galaxies come from both the ESO catalog and the Vorontsov-Velyaminov Catalogs. Morphological type codes: -7 Elliptical (Unclassified) -6 Compact Elliptical -5 E, and dwarf E -4 E/S0 -3 L-, SO- -2 L, SO -1 L+, SO+ 0 SO/a, SO-a 1 Sa 2 Sab 3 Sb 4 Sbc 5 Sc 6 Scd 7 Sd 8 Sdm 9 Sm, Magellanic Spiral 10 Im, Irr I, Magellanic Irregular, Dwarf Irregular 11 Compact Irregular, Extragalactic HII Region 15 Peculiar, Unclassifiable 16 Irr II 20 S..., Sc-Irr, Unclassified Spiral 25 Plate Flaw, Star, etc. misclassified as galaxy 33 Reflection Nebula, misclasified as galaxy 32 HII Region misclasified as galaxy 30 Planetary Nebula, misclassified as galaxy 40 Part of a galaxy, e.g. a bright HII region like N5471 Bar: A unbarred X mixed type B barred Lum: Luminosity Classes (for Spirals and Irregulars) 1 I 6 III-IV 2 I-II 7 IV 3 II 8 IV-V 4 II-III 9 V 5 III Pec: P = Peculiar S = No inner ring R = Ringed (outer) T = Pseudo inner ring D = Double or Multiple Comments: If the comment is "See Notes," then there is a note about a superposed star in the corresponding notes file. -------------------------------------------------------------------------------- Byte-by-byte Description of file: notes1.dat notes2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-12 A12 --- Name Source name 13-14 2X --- --- Blank 15-38 A24 --- Note Superposed star(s) name(s) or other note -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- Source Redshift source code 5- 7 3X --- --- Blank 8-182 A175 --- Reference Reference to redshift source -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 30-Mar-1997