2016A&A...591A..38C


Query : 2016A&A...591A..38C

2016A&A...591A..38C - Astronomy and Astrophysics, volume 591A, 38-38 (2016/7-1)

Robust automatic photometry of local galaxies from SDSS. Dissecting the color magnitude relation with color profiles.

CONSOLANDI G., GAVAZZI G., FUMAGALLI M., DOTTI M. and FOSSATI M.

Abstract (from CDS):

We present an automatic procedure to perform reliable photometry of galaxies on SDSS images. We selected a sample of 5853 galaxies in the Coma and Virgo superclusters. For each galaxy, we derive Petrosian g and i magnitudes, surface brightness and color profiles. Unlike the SDSS pipeline, our procedure is not affected by the well known shredding problem and efficiently extracts Petrosian magnitudes for all galaxies. Hence we derived magnitudes even from the population of galaxies missed by the SDSS which represents ∼25% of all local supercluster galaxies and ∼95% of galaxies with g<11mag. After correcting the g and i magnitudes for Galactic and internal extinction, the blue and red sequences in the color magnitude diagram are well separated, with similar slopes. In addition, we study (i) the color-magnitude diagrams in different galaxy regions, the inner (r<=1kpc), intermediate (0.2RPet<=r<=0.3RPet) and outer, disk-dominated (r>=0.35RPet)) zone; and (ii), we compute template color profiles, discussing the dependences of the templates on the galaxy masses and on their morphological type. The two analyses consistently lead to a picture where elliptical galaxies show no color gradients, irrespective of their masses. Spirals, instead, display a steeper gradient in their color profiles with increasing mass, which is consistent with the growing relevance of a bulge and/or a bar component above 1010M.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: evolution - galaxies: fundamental parameters - galaxies: star formation - galaxies: photometry

VizieR on-line data: <Available at CDS (J/A+A/591/A38): table1.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1725 0
2 NAME Coma Supercluster SCG 11 23 +23.9           ~ 259 0
3 M 61 Sy2 12 21 54.9282582888 +04 28 25.597367184 10.07 10.18 9.65     ~ 948 2
4 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1762 2
5 IC 3258 GiC 12 23 44.4789302568 +12 28 41.951393292   14.3       ~ 147 0
6 NGC 4402 GiP 12 26 07.65312 +13 06 47.9376   12.55       ~ 385 2
7 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
8 NGC 4459 H2G 12 29 00.0329905416 +13 58 42.826603332   11.6       ~ 522 0
9 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 6826 3
10 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 496 0
11 IC 3446 GiG 12 31 23.137 +11 29 34.15   15.63       ~ 77 1
12 IC 3492 GiC 12 33 19.772 +12 51 12.77   15 15.30     ~ 84 0
13 NGC 4535 H2G 12 34 20.3443516704 +08 11 51.908488116   11.1       ~ 579 0
14 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 968 2
15 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 860 1
16 NGC 4762 LIN 12 52 56.049 +11 13 50.88   11.1       ~ 350 0
17 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4599 2

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2023.01.27-22:12:15

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