J/MNRAS/471/4027 CVRHS classifications for the GZ2 Ring Sample (Buta, 2017)
Galactic rings revisited.
I. CVRHS classifications of 3962 ringed galaxies from the Galaxy Zoo 2 Database.
Buta R.J.
<Mon. Not. R. Astron. Soc., 471, 4027-4046 (2017)>
=2017MNRAS.471.4027B 2017MNRAS.471.4027B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Morphology
Keywords: galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: spiral - galaxies: star formation - galaxies: statistics -
galaxies: structure
Abstract:
Rings are important and characteristic features of disc-shaped
galaxies. This paper is the first in a series that re-visits galactic
rings with the goals of further understanding the nature of the
features and for examining their role in the secular evolution of
galaxy structure. The series begins with a new sample of 3962 galaxies
drawn from the Galaxy Zoo 2 citizen science data base, selected
because zoo volunteers recognized a ring-shaped pattern in the
morphology as seen in Sloan Digital Sky Survey colour images. The
galaxies are classified within the framework of the Comprehensive de
Vaucouleurs revised Hubble-Sandage system. It is found that zoo
volunteers cued on the same kinds of ring-like features that were
recognized in the 1995 Catalogue of Southern Ringed Galaxies. This
paper presents the full catalogue of morphological classifications,
comparisons with other sources of classifications and some histograms
designed mainly to highlight the content of the catalogue. The
advantages of the sample are its large size and the generally good
quality of the images; the main disadvantage is the low physical
resolution that limits the detectability of linearly small rings such
as nuclear rings. The catalogue includes mainly inner and outer disc
rings and lenses. Cataclysmic ('encounter-driven') rings (such as ring
and polar ring galaxies) are recognized in less than 1 per cent of the
sample.
Description:
The catalogue provides comprehensive de Vaucouleurs Hubble-Sandage
types for 3962 galaxies from the Galaxy Zoo 2 database. For each
galaxy, the catalogue gives the name from the NASA/IPAC Extragalactic
Database (NED) or a Sloan Digital Sky Survey (SDSS) positional name;
the number in the extended Principal Galaxy Catalogue/LEDA data base;
the GZ2 file number, the redshift if known; the stage on the RC3
numerical scale; the family (barred versus nonbarred on a numerical
scale; the full CVRHS type; and some brief notes on each object.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 160 3962 CVRHS classifications for 3962 Galaxies
in the GZ2 Ring Sample
--------------------------------------------------------------------------------
See also:
J/ApJS/217/32 : S4G galaxy morphologies in the CVRHS system (Buta+, 2015)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right Ascension (J2000.0)
3- 4 I2 min RAM Right Ascension (J2000.0)
5- 9 F5.2 s RAs Right Ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
16- 17 I2 arcmin DEm Declination (J2000.0)
18- 21 F4.1 arcsec DEs Declination (J2000.0)
24- 53 A30 --- Names NEDNAME/SDSS positional name
54- 60 I7 --- PGCName ?=- Principal Galaxy Catalogue/Lyon
Extragalactic Database Name
63- 68 A6 --- FILEN Galaxy Zoo 2 file name in format FILEN.dat
71- 75 F5.3 --- z ?=- Redshift (1)
78- 88 A11 --- OV Outer variety
91- 98 A8 --- Fam Family
101-112 A12 --- IV Inner/nuclear variety
115-119 A5 --- ST Stage
121-122 I2 --- T Numerical stage index (2)
125-128 F4.2 --- F Numerical family index (3)
131-160 A30 --- CVRHS Comprehensive de Vaucouleurs revised
Hubble-Sandage classification
--------------------------------------------------------------------------------
Note (1): From ned.ipac.caltech.edu
Note (2): On scale of Third Reference Catalogue of Bright Galaxies (RC3, de
Vaucouleurs et al. (1991rc3..book.....D 1991rc3..book.....D, Cat. VII/155).
Note (3): On scale of Buta et al. (2015ApJS..217...32B 2015ApJS..217...32B, Cat. J/ApJS/217/32).
--------------------------------------------------------------------------------
Acknowledgements:
Ronald Buta, rbuta(at)ua.edu
(End) Ronald Buta [Univ. of Alabama, USA], Patricia Vannier [CDS] 03-Jul-2019