J/other/RAA/11.309 Nearby early-type galaxies in Stripe 82 (Jiang+, 2011)
Surface photometry and radial color gradients of nearby luminous early-type
galaxies in SDSS Stripe 82.
Jiang F.-Z., Huang S., Gu Q.-S.
<Res. Astron. Astrophys., 11, 309-326 (2011)>
=2011RAA....11..309J 2011RAA....11..309J
ADC_Keywords: Galaxies, nearby ; Photometry, surface ; Photometry, SDSS
Keywords: galaxies: early-type galaxies -
galaxies: surface brightness profiles and color gradients -
techniques: photometric
Abstract:
We make use of the images from the Sloan Digital Sky Survey Stripe 82
(Stripe 82) to present an analysis of r band surface brightness
profiles and radial color gradients (g-r, u-r) in our sample of
111 nearby early-type galaxies (ETGs). Thanks to the Stripe 82 images,
each of which is co-added from about 50 single frames, we are able to
pay special attention to the low-surface-brightness areas (LSB areas)
of the galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 167 143 Detailed information about the sample,
photometric results and color gradients
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See also:
J/MNRAS/382/515 : SDSS ultracool and halo WD candidates (Vidrih+, 2007)
J/ApJS/186/233 : Variable point sources in SDSS stripe 82. I. (Bhatti+, 2010)
J/A+A/525/A37 : QSOs variability indexes in SDSS Stripe 82 (Meusinger+, 2011)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS Name (JHHMMSS.s+DDMMSS.S)
20 A1 --- n_SDSS [a] low quality photometry (1)
22- 33 F12.8 deg RAdeg Right ascension in decimal degrees (J2000)
35- 45 F11.8 deg DEdeg Declination in decimal degrees (J2000)
48- 51 F4.2 --- FdV [0/1] Photometric parameter fracDev(r) (2)
54- 59 F6.4 --- n ? Sersic index
63- 69 F7.4 pix Re ? Effective radius
72- 76 F5.2 pix R90 ? Radius containing 90% of the Petrosian flux
79- 85 F7.5 --- Cr ? Concentration index in r (R90/R50) (4)
87- 93 F7.4 mag/arcsec2 mue ? Surface brightness within Re (4)
95-105 F11.8 --- g(g-r)i ? Inner g-r colour gradient (3)
108-118 F11.8 --- g(g-r)o ? Outer g-r colour gradient (3)
120-130 F11.8 --- g(u-r)i ? Inner u-r colour gradient (3)
132-141 F10.7 --- g(u-r)o ? Outer u-r colour gradient (3)
142-153 F12.9 --- a4/a ? Isophotal parameter a4/a
155-160 F6.4 --- e ? Ellipticity (1-b/a)
163-167 F5.2 mag rmag ? r magnitude
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Note (1): a: The photometric results are not reliable, so it is not taken
into the analyses
Note (2): fracDev(r) indicates how well a galaxy's profile is modeled by
its de Vaucouleurs profile (Sersic index n=4) in the red band: a
value of 1 means a typical de Vaucouleurs profile.
Note (3): the color gradient in the color "col" is defined as
d(col)/dlog(R/Re)
Note (4): the 2 columns (Cr and mue) are inverted in the paper.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2011