J/A+A/445/765 A Catalog of Edge-on Disk Galaxies (Kautsch+, 2006)
A Catalog of Edge-on Disk Galaxies: From Galaxies with a Bulge to Superthin Galaxies. Kautsch S.J., Grebel E.K., Barazza F.D., Gallagher J.S.III <Astron. Astrophys. 445, 765 (2006)> =2006A&A...445..765K
ADC_Keywords: Galaxy catalogs ; Morphology ; Photometry, SDSS ; Redshifts Keywords: catalogs - galaxies: spiral - galaxies: irregular - galaxies: photometry - galaxies: statistics - galaxies: fundamental parameters Abstract: Spiral galaxies range from bulge-dominated early-type galaxies to late types with little or no bulge. Cosmological models do not predict the formation of disk-dominated, essentially bulgeless galaxies, yet these objects exist. A particularly striking and poorly understood example of bulgeless galaxies are flat or superthin galaxies with large axis ratios. We therefore embarked on a study aimed at a better understanding of these enigmatic objects, starting by compiling a statistically meaningful sample with well-defined properties. The disk axis ratios can be most easily measured when galaxies are seen edge-on. We used data from the Sloan Digital Sky Survey (SDSS) in order to identify edge-on galaxies with disks in a uniform, reproducible, automated fashion. In the five-color photometric database of the SDSS Data Release 1 (DR1, http://www.sdss.org/dr1) (2099 deg^2) we identified 3169 edge-on disk galaxies, which we subdivided into disk galaxies with bulge, intermediate types, and simple disk galaxies without any obvious bulge component. We subdivided these types further into subclasses: Sa(f), Sb(f), Sc(f), Scd(f), Sd(f), Irr(f), where the (f) indicates that these galaxies are seen edge-on. Here we present our selection algorithm and the resulting catalogs of the 3169 edge-on disk galaxies including the photometric, morphological, and structural parameters of our targets. A number of incompleteness effects affect our catalog, but it contains almost a factor of four more bulgeless galaxies with prominent simple disks (flat galaxies) within the area covered here than optical previous catalogs, which were based on the visual selection from photographic plates (Karachentsev et al. 1999, see Cat. VII/219). We find that approximately 15% of the edge-on disk galaxies in our catalog are flat galaxies, demonstrating that these galaxies are fairly common, especially among intermediate- mass star-forming galaxies. Bulgeless disks account for roughly one third of our galaxies when also puffy disks and edge-on irregulars are included. Our catalog provides a uniform database for a multitude of follow-up studies of bulgeless galaxies in order to constrain their intrinsic and environmental properties and their evolutionary status. Description: The structural parameters of the catalog entries are shown in Table 2. Table 3 contains the photometric parameters and the redshifts. All entries are ordered by increasing right ascension. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 170 3169 Structural Parameters table3.dat 115 3169 Photometric Parameters and Redshifts
See also: http://www.sdss.org/dr1 : SDSS DR1 Home Page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS Galaxy name 27- 28 I2 h RAh Right ascension (
J2000) 30- 31 I2 min RAm Right ascension ( J2000) 33- 38 F6.3 s RAs Right ascension ( J2000) 42 A1 --- DE- Declination sign ( J2000) 43- 44 I2 deg DEd Declination ( J2000) 46- 47 I2 arcmin DEm Declination ( J2000) 49- 54 F6.3 arcsec DEs Declination ( J2000) 57- 62 A6 --- MType Morphological type 65- 70 F6.3 --- el(g) Luminosity weighted mean isophotal ellipticity in g band (G1) 73- 78 F6.3 --- el(r) Luminosity weighted mean isophotal ellipticity in r band (G1) 81- 86 F6.3 --- el(i) Luminosity weighted mean isophotal ellipticity in i band (G1) 89- 94 F6.3 --- CI(g) Concentration index in g ( G1)(1) 97-102 F6.3 --- CI(r) Concentration index in r ( G1)(1) 105-110 F6.3 --- CI(i) Concentration index in i ( G1)(1) 113-120 F8.3 arcsec Diam(g) ?=0 Isophotal angular diameter in g ( G1)(1) 123-130 F8.3 arcsec Diam(r) ?=0 Isophotal angular diameter in r ( G1)(1) 133-140 F8.3 arcsec Diam(i) ?=0 Isophotal angular diameter in i ( G1)(1) 143-150 F8.3 --- a/b(g) ?=0.000 Axial ratio in g band ( G1)(1) 153-160 F8.3 --- a/b(r) ?=0.000 Axial ratio in r band ( G1)(1) 163-170 F8.3 --- a/b(i) ?=0.000 Axial ratio in i band ( G1)(1)
Note (1): The values are derived from SDSS DR1 (http://www.sdss.org/dr1) parameters as described in the catalog paper. If no value is given in the SDSS DR1 database, these values are filled with zeros.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS Galaxy name 27- 32 A6 --- MType Morphological type 35- 39 F5.2 mag gmag ?=0.0 Petrosian magnitude in g (G1)(
1)(2) 42- 46 F5.2 mag e_gmag ?=0.0 Petrosian magnitude error in g ( G1)(1) 49- 53 F5.2 mag rmag ?=0.0 Petrosian magnitude in r (G1)( 1)(2) 56- 60 F5.2 mag e_rmag ?=0.0 Petrosian magnitude error in r ( G1)(1) 63- 67 F5.2 mag imag ?=0.0 Petrosian magnitude in i (G1)( 1)(2) 70- 74 F5.2 mag e_imag ?=0.0 Petrosian magnitude error in i ( G1)(1) 77- 81 F5.2 mag/arcsec2 gmue ?=0.0 Total surface brightness in g ( G1)(1) 84- 88 F5.2 mag/arcsec2 rmue ?=0.0 Total surface brightness in r ( G1)(1) 91- 95 F5.2 mag/arcsec2 imue ?=0.0 Total surface brightness in i ( G1)(1) 98-103 F6.4 --- z ?=0.0 Spectroscopic redshift (1) 106-115 E10.4 --- e_z ?=0.0 Spectroscopic redshift error (1)
Note (1): Values are taken from the SDSS DR1 (http://www.sdss.org/dr1) database. If no value is given in the SDSS DR1 database, these values are filled with zeros. Note (2): Corrected for foreground Galactic extinction according to Schlegel et al. (1998ApJ...500...525S).
Global Notes: Note (G1): The g,r,i bands are the filters used by SDSS DR1 (http://www.sdss.org/dr1).
Acknowledgements: Stefan Kautsch, kautsch(at)astro.unibas.ch
(End) Patricia Vannier [CDS] 13-Sep-2005
|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|