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J/MNRAS/405/783     Passive red spirals in Galaxy Zoo        (Masters+, 2010)

Galaxy Zoo: passive red spirals. Masters K.L., Mosleh M., Romer A.K., Nichol R.C., Bamford S.P., Schawinski K., Lintott C.J., Andreescu D., Campbell H.C., Crowcroft B., Doyle I., Edmondson E.M., Murray P., Raddick M.J., Slosar A., Szalay A.S., Vandenberg J. <Mon. Not. R. Astron. Soc., 405, 783-799 (2010)> =2010MNRAS.405..783M
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, SDSS Keywords: surveys - galaxies: active - galaxies: evolution - galaxies: photometry - galaxies: spiral Abstract: We study the spectroscopic properties and environments of red (or passive) spiral galaxies found by the Galaxy Zoo project. By carefully selecting face-on disc-dominated spirals, we construct a sample of truly passive discs (i.e. they are not dust reddened spirals, nor are they dominated by old stellar populations in a bulge). As such, our red spirals represent an interesting set of possible transition objects between normal blue spiral galaxies and red early types, making up ∼6 per cent of late-type spirals. We use optical images and spectra from Sloan Digital Sky Survey to investigate the physical processes which could have turned these objects red without disturbing their morphology. Description: The sample of visually classified spiral galaxies used in this paper is drawn from the Galaxy Zoo (GZ1) clean catalogue (Lintott et al. 2008MNRAS.389.1179L) which, by an order of magnitude, is the largest morphologically classified sample of galaxies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 89 294 Data for red spiral sample tablea2.dat 89 5139 Data for blue spiral sample
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) http://www.sdss.org : SDSS Home Page http://zoo1.galaxyzoo.org : Galaxy Zoo Home Page Byte-by-byte Description of file: tablea?.dat
Bytes Format Units Label Explanations
1- 18 A18 --- SDSS SDSS object identification number 20- 29 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 31- 40 F10.6 deg DEdeg Declination in decimal degrees (J2000) 42- 47 F6.4 --- z Redshift 49- 54 F6.2 mag rMAG Absolute r-band (Petrosian) magnitude 56- 59 F4.2 mag e_rMAG rms uncertainty on rMAG 61- 65 F5.3 mag g-r g-r colour index (from model magnitudes) 67- 71 F5.3 mag e_g-r rms uncertainty on g-r 73- 78 F6.3 --- Red Redness, defined as the distance in magnitudes from the blue limit of the (g-r) versus rMAG red sequence 80- 84 F5.3 --- log(a/b) Major-to-minor axis ratio rom the r-band isophotal measurement 86- 89 F4.2 --- fdeV Fraction of the best-fitting light profile made up by a de Vaucouleur profile (as opposed to an exponential disc)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Dec-2010
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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