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 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 2008MNRAS.389.1179L) which, by an order of magnitude, is the largest
morphologically classified sample of galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 89 294 Data for red spiral sample
tablea2.dat 89 5139 Data for blue spiral sample
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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
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Bytes Format Units Label Explanations
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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)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Dec-2010