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VII/192    Arp's Peculiar Galaxies        (Webb 1996)

Contemporary Index Into Halton Arp's Peculiar Galaxies Webb D. <Sky & Telescope, 92-1, 92 (1996)> =1996S&T....92...92W
ADC_Keywords: Galaxy catalogs; Historical catalog Description: Halton C. Arp photographed 338 views of notable peculiar galaxies and published them as his 1966 "Atlas of Peculiar Galaxies." Since then, galaxy catalogs have named 585 of the involved galaxies. This contemporary index collects names and characteristics of the involved objects for use by contemporary observers of the historical views. Introduction: The galaxies identified in Arp's Atlas of Peculiar Galaxies represent a remarkable cross-section of observing opportunities. With the wide availability of inexpensive CCD cameras and increasing aperture of inexpensive commercial telescopes, more of the Arp list is accessible to more observers. Many of the objects so catalogued were anonymous galaxies in 1966 and have subsequently been characterized and named. The NASA-IPAC Extragalactic Database (NED) provided most correlations and other sources identified others. Please refer to http://users.aol.com/arpgalaxy for further information. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file arpord.dat 57 338 list of Arp views with imaging data arplist.dat 77 592 list and info for involved galaxies
See also: VII/74 : Atlas of Peculiar Galaxies (Arp, 1966): redshifts Text describing arpord.dat: This file summarizes the 338 Arp "objects" in Arp sequence. It includes the name either of the group or the brightest galaxy in the view. Image size and orientation were derived from Arp's original paper. Maximum focal lengths of optical system required to duplicate Arp's image using contemporary commercial CCD cameras are also provided to aid the imaging observer. To find details on the involved galaxies, use this table to locate RA and Dec and look up the participating galaxies in arplist.dat. Byte-by-byte Description of file: arpord.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Arp Arp number from original catalog 5- 21 A17 --- Name *Common name (group or brightest) 22- 23 I2 h RAh Right Ascension J2000 (hours) 25- 29 F5.2 min RAm ? Right Ascension J2000 (minutes) 31 A1 --- DE- Declination J2000 (sign) 32- 33 I2 deg DEd Declination J2000 (degrees) 35- 38 F4.1 arcmin DEm Declination J2000 (minutes) 40- 43 F4.1 arcmin Size *Long dimension of Arp's original photo 45 A1 --- Orient *[N,S,E,W,?] Orientation of Arp photo 47- 49 I3 2.54cm fl_245 *?Focal length for CB245 CCD Camera (1) 51- 53 I3 2.54cm fl_ST6 *?Focal length for SBIG ST6 CCD Camera (1) 55- 57 I3 2.54cm fl_ST5 *?Focal length for SBIG ST5 CCD Camera (1)
Note on Name: The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. Note on Size: Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. Note on Orient: Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. Note (1): These three columns are the focal lengths in inches of the optical system necessary to duplicate Arp's original image using the named CCD camera.
Text describing arplist.dat: This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. Byte-by-byte Description of file: arplist.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Arp Arp number from original catalog 5- 20 A16 --- Name Common name of galaxy 21- 24 F4.1 mag VT *?Total V-magnitude 25 A1 --- u_VT [?] Uncertain magnitude = ? 27- 30 F4.1 arcmin dim1 ?Larger dimension of galaxy 31 A1 --- --- [X] 32- 35 F4.1 arcmin dim2 ?Smaller dimension (if differs from dim1) 37 A1 --- u_dim2 [?] Uncertain size = ? 39- 52 A14 --- MType *Morphological Type 53- 55 I3 --- Uchart *?Uranometria chart number 58- 59 I2 h RAh Right Ascension J2000 (hours) 61- 62 I2 min RAm Right Ascension J2000 (minutes) 64- 67 F4.1 s RAs Right Ascension J2000 (seconds) 69 A1 --- DE- Declination J2000 (sign) 70- 71 I2 deg DEd Declination J2000 (degrees) 73- 74 I2 arcmin DEm Declination J2000 (minutes) 76- 77 I2 arcsec DEs Declination J2000 (seconds)
Note on VT: Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. Note on MType: Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". Note on Uchart: Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column.
Acknowledgments: THIS RESEARCH MADE USE OF THE NASA/IPAC EXTRAGALACTIC DATABASE (NED) WHICH IS OPERATED BY THE JET PROPULSION LABORATORY, CALTECH, UNDER CONTRACT WITH THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION Al Kelly computed image sizes and required focal lengths for contemporary CCD cameras. He also photographed a few to verify that amateur CCD cameras can see faint peculiarity. Mike Brown loaded galaxy size information and audited the list against the MegaStar Deep Sky Atlas database (RC3 and PGC) Emil Bonanno precessed coordinates from epochs 1950 to 2000. Barbara Wilson provided desire, consultation and encouragement. Lara Lenoir audited the list against the Deep Sky Field Guide, and MegaStar (RC3 and PGC). Halton C. Arp for not being offended at the interest in his early work. References: Atlas of Peculiar Galaxies, 1966, Arp, ApJ Supp 123, Volume XIV, 1 =1966ApJS..123n...1A The Deep Sky Field Guide to Uranometria 2000.0, 1993, Cragin et. al., Willman-Bell, Inc.
(End) Dennis Webb [Johnson Space Center Astronomical Society] 19-Jul-1996
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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