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J/AJ/128/163 Galaxy morphological classification (Lotz+, 2004)
A new nonparametric approach to galaxy morphological classification. Lotz J.M., Primack J., Madau P. <Astron. J., 128, 163-182 (2004)> =2004AJ....128..163L
ADC_Keywords: Morphology ; Galaxies, peculiar Keywords: galaxies: fundamental parameters - galaxies: high-redshift - galaxies: peculiar - galaxies: structure Abstract: We present two new nonparametric methods for quantifying galaxy morphology: the relative distribution of the galaxy pixel flux values (the Gini coefficient or G) and the second-order moment of the brightest 20% of the galaxy's flux (M20). We test the robustness of G and M20 to decreasing signal-to-noise ratio (S/N) and spatial resolution and find that both measures are reliable to within 10% for images with average S/N per pixel greater than 2 and resolutions better than 1000 and 500pc, respectively. We have measured G and M20, as well as concentration (C), asymmetry (A), and clumpiness (S) in the rest-frame near-ultraviolet/optical wavelengths for 148 bright local "normal" Hubble-type galaxies (E-Sd) galaxies, 22 dwarf irregulars, and 73 0.05<z<0.25 ultraluminous infrared galaxies (ULIRGs). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 108 105 Frei Galaxy Catalog (1996AJ....111..174F) table3.dat 140 54 SDSS u-selected Catalog (2003AJ....126.2081A) notes.dat 103 19 Notes table5.dat 90 73 Borne et al. (2000ApJ...529L..77B) ULIRG HST Survey table7.dat 80 49 HDF-N Lyman Break Galaxies
See also: J/ApJS/107/1 : Morphologies of distant galaxies II (Abraham+ 1996) J/AJ/126/2579 : SDSS quasar catalog. II. First data release (Schneider+, 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Galaxy name (1) 10 A1 --- n_Name [4] Indicates also observed by SDSS DR1 (also in Table 3) 12- 26 A15 --- Type The Sandage & Bedke (1994) type (2) 28- 32 F5.1 mag BMag Absolute B-band magnitude (RC3, Cat. VII/155, apparent magnitude minus m-M) 34- 38 F5.2 mag m-M Distance modulus 40- 41 I2 --- n_m-M Note on m-M, see file notes.dat 43- 46 F4.1 --- S/N-B BJ or Gunn g-band signal-to-noise ratio 48- 51 F4.2 --- CB BJ or Gunn g-band concentration 53- 57 F5.2 --- AB BJ or Gunn g-band asymmetry 59- 64 F6.3 --- SB BJ or Gunn g-band clumpiness 66- 69 F4.2 --- GB BJ or Gunn g-band Gini coefficient 71- 75 F5.2 --- M20B Second-order moment of brightest 20% BJ or Gunn g-band flux 77- 80 F4.1 --- S/N-R R or Gunn r-band signal-to-noise ratio 82- 85 F4.2 --- CR R or Gunn r-band concentration 87- 91 F5.2 --- AR R or Gunn r-band asymmetry 93- 97 F5.2 --- SR R or Gunn r-band clumpiness 99-102 F4.2 --- GR R or Gunn r-band Gini coefficient 104-108 F5.2 --- M20R Second-order moment of brightest 20% R- or Gunn r-band flux
Note (1): Frei et al. (1996AJ....111..174F) catalog; see also http://www.astro.princeton.edu/~frei/catalog.html. Note (2): Sandage, A., & Bedke, J.: 1994, The Carnegie Atlas of Galaxies, Volume 1 (Washington: Carnegie Inst.)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Galaxy name (1) 10 A1 --- n_Name [4] Indicates also observed by Frei et al., 1996AJ....111..174F (also in Table 2) 12- 24 A13 --- MType The Sandage & Bedke (1994) type (2) 26- 30 F5.1 mag BMag Absolute B-band magnitude (RC3, Cat. VII/155, apparent magnitude minus m-M) 32- 36 F5.2 mag m-M Distance modulus 38- 39 I2 --- n_m-M Note on m-M 41- 43 F3.1 --- S/N-u SDSS u-band signal-to-noise ratio 45- 48 F4.2 --- Cu SDSS u-band concentration 50- 54 F5.2 --- Au SDSS u-band asymmetry 56- 60 F5.2 --- Su SDSS u-band clumpiness 62- 65 F4.2 --- Gu SDSS u-band Gini coefficient 67- 72 F6.3 --- M20u Second-order moment of brightest 20% u-band flux 74- 77 F4.1 --- S/N-g SDSS g-band signal-to-noise ratio 79- 82 F4.2 --- Cg SDSS g-band concentration 84- 88 F5.2 --- Ag SDSS g-band asymmetry 90- 94 F5.2 --- Sg SDSS g-band clumpiness 96- 99 F4.2 --- Gg SDSS g-band Gini coefficient 101-105 F5.2 --- M20g Second-order moment of brightest 20% g-band flux 107-112 F6.3 --- S/N-r SDSS r-band signal-to-noise ratio 114-117 F4.2 --- Cr SDSS r-band concentration 119-123 F5.2 --- Ar SDSS r-band asymmetry 125-129 F5.2 --- Sr SDSS r-band clumpiness 131-134 F4.2 --- Gr SDSS r-band Gini coefficient 136-140 F5.2 --- M20r Second-order moment of brightest 20% r-band flux
Note (1): Abazajian et al. (2003AJ....126.2081A) catalog; http://www.sdss.org/dr1. Note (2): Sandage, A., & Bedke, J.: 1994, The Carnegie Atlas of Galaxies, Volume 1 (Washington: Carnegie Inst.)
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Note Note number 4-103 A100 --- Text Note and reference
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Galaxy name (1) 18 A1 --- m_Name Multiplicity flag on Name 20- 25 F6.4 --- z NED redshift 27- 28 I2 h RAh Hour of right ascension (J2000) 30- 31 I2 min RAm Minute of right ascension (J2000) 33- 34 I2 s RAs Second of right ascension (J2000) 36 A1 --- DE- Sign of the declination (J2000) 37- 38 I2 deg DEd Degree of declination (J2000) 40- 41 I2 arcmin DEm Arcminute of declination (J2000) 43- 44 I2 arcsec DEs Arcsecond of declination (J2000) 46- 48 F3.1 --- S/N Signal-to-noise ratio 50- 53 F4.2 --- C Concentration 55- 59 F5.2 --- A Asymmetry 61- 64 F4.2 --- S Clumpiness 66- 69 F4.2 --- G Gini coefficient 71- 75 F5.2 --- M20 Second-order moment of brightest 20% flux 77- 90 A14 --- Class Cui et al. (2001AJ....122...63C) nuclei classification (except where starred)
Note (1): Borne et al. (2000ApJ...529L..77B) catalog; HST WFPC2 F814W observations.
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 6 A6 --- HNM Identification number (1) 8- 12 F5.3 --- z Photometric redshift (2) 14 A1 --- f_z [3] Indicates a spectroscopic redshift (3) 16- 17 I2 h RAh Hour of right ascension (J2000) 19- 20 I2 min RAm Minute of right ascension (J2000) 22- 26 F5.2 s RAs Second of right ascension (J2000) 27 A1 --- DE- Sign of the declination (J2000) 28- 29 I2 deg DEd Degree of declination (J2000) 31- 32 I2 arcmin DEm Arcminute of declination (J2000) 34- 37 F4.1 arcsec DEs Arcsecond of declination (J2000) 39- 43 F5.2 mag Hmag The H-band magnitude 45- 49 F5.1 mag BMag Absolute B-band magnitude 51- 54 F4.2 arcsec Rad Petrosian radius 56- 59 F4.1 --- S/N Signal-to-noise ratio 61- 63 F3.1 --- C Concentration 65- 69 F5.2 --- A Asymmetry 71- 74 F4.2 --- G Gini coefficient 76- 80 F5.2 --- M20 Second-order moment of brightest 20% flux
Note (1): M. Dickinson 2003, private communication. Note (2): See Budavari et al. 2000AJ....120.1588B. Note (3): See Cohen et al. (2000, Cat. J/ApJ/538/29).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 03-Oct-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 |
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