2011MNRAS.412.2063C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST14:08:18

2011MNRAS.412.2063C - Mon. Not. R. Astron. Soc., 412, 2063-2070 (2011/April-2)

Mid-infrared colour gradients and the colour–magnitude relation in Virgo early-type galaxies.

CLEMENS M.S., PANUZZO P., RAMPAZZO R., VEGA O. and BRESSAN A.

Abstract (from CDS):

We make use of Spitzer imaging between 4 and 16 µm and near-infrared data at 2.2 µm to investigate the nature and distribution of the mid-infrared emission in a sample of early-type galaxies (ETGs) in the Virgo cluster. These data allow us to conclude, with some confidence, that the emission at 16 µm in passive ETGs is stellar in origin, consistent with previous work concluding that the excess mid-infrared emission comes from the dusty envelopes around evolved asymptotic giant branch (AGB) stars. There is little evidence for the mid-infrared emission of an unresolved central component, as might arise in the presence of a dusty torus associated with a low-luminosity active galactic nucleus.

We none the less find that the 16-µm emission is more centrally peaked than the near-infrared emission, implying a radial stellar population gradient. By comparing with independent evidence from studies at optical wavelengths, we conclude that a metallicity that falls with increasing radius is the principal driver of the observed gradient.

We also plot the mid-infrared colour-magnitude diagram and combine with similar work on the Coma cluster to define the colour-magnitude relation for absolute K-band magnitudes from -26 to -19. Because a correlation between mass and age would produce a relation with a gradient in the opposite sense to that observed, we conclude that the relation reflects the fact that passive ETGs of lower mass also have a lower average metallicity. The colour-magnitude relation is thus driven by metallicity effects.

In contrast to what is found in Coma, we do not find any objects with anomalously bright 16-µm emission relative to the colour-magnitude relation. Although there is little overlap in the mass ranges probed in the two clusters, this may suggest that observable `rejuvenation' episodes are limited to intermediate-mass objects.


Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular cD - galaxies: evolution - galaxies: photometry - infrared: galaxies

Simbad objects: 35

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Number of rows : 35

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 783 GiG 12 21 38.7930527227 +15 44 42.343541431   14.60     12.6 ~ 85 1
2 NGC 4318 GiG 12 22 43.301 +08 11 54.12   14.1       ~ 122 0
3 NGC 4322 GiC 12 23 01.7245868726 +15 54 20.018381978   14.81 13.94     ~ 75 1
4 NGC 4352 GiG 12 24 05.0219273303 +11 13 05.088363600   14.0       ~ 148 0
5 NGC 4366 GiG 12 24 47.0073994500 +07 21 10.897283360   15.2       ~ 36 0
6 IC 3305 GiG 12 25 14.4948831946 +11 50 58.608835989   15.12       ~ 39 1
7 NGC 4387 GiG 12 25 41.6768872639 +12 48 37.809497625 13.42 13.01 12.12   10.87 ~ 374 1
8 IC 3328 GiP 12 25 57.964 +10 03 13.37   14.9       ~ 146 0
9 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1022 1
10 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6009 0
11 IC 3349 GiG 12 26 47.0621218462 +12 27 14.333095038   15.3 13.98   12.95 ~ 74 0
12 IC 3358 GiG 12 26 54.423 +11 39 48.84   14.28 13.52   12.30 ~ 63 1
13 NGC 4431 GiP 12 27 27.3822223151 +12 17 25.034830442 14.17 13.74 12.89     ~ 150 1
14 NGC 4436 GiP 12 27 41.2351234585 +12 18 57.204566597 14.20 13.91 12.98     ~ 117 1
15 NGC 4442 GiG 12 28 03.893 +09 48 13.03   11.2       ~ 265 0
16 IC 794 GiG 12 28 08.6084194302 +12 05 35.868939739   14.07 13.44   12.39 ~ 100 1
17 IC 3381 LSB 12 28 14.854 +11 47 23.69   14.42       ~ 146 1
18 IC 3393 GiG 12 28 41.7049079126 +12 54 57.276857130   14.85 14.24   13.19 ~ 100 1
19 NGC 4458 GiP 12 28 57.532 +13 14 30.90 13.27 12.93 12.07     ~ 392 2
20 NGC 4464 GiG 12 29 21.313 +08 09 23.63   13.5       ~ 219 0
21 NGC 4467 GiG 12 29 30.267 +07 59 34.62   15.2       ~ 163 0
22 2MASX J12300506+0804241 G 12 30 05.0713836198 +08 04 23.973879851   16.82 15.13     ~ 70 0
23 NGC 4482 GiG 12 30 10.3250399673 +10 46 46.084712572   14.2       ~ 153 0
24 NGC 4479 GiG 12 30 18.343 +13 34 38.88 13.73 13.40 12.44     ~ 169 2
25 IC 3437 GiC 12 30 45.9045107280 +11 20 35.360387546   15.5       ~ 49 0
26 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6383 3
27 IC 3443 GiC 12 31 15.7338208652 +12 19 54.409742135   16.15 14.95   13.74 ~ 62 0
28 IC 3468 GiG 12 32 14.209 +10 15 05.55   14.6       ~ 124 0
29 IC 3478 GiG 12 32 44.1876346313 +14 11 46.272704271   15.0       ~ 50 1
30 NGC 4515 GiG 12 33 04.944 +16 15 55.76   13.3       ~ 135 0
31 NGC 4516 GiG 12 33 07.5370117388 +14 34 29.744416917   13.9       ~ 78 0
32 IC 3486 GiG 12 33 14.026 +12 51 27.77   15.3       ~ 48 1
33 M 59 GiG 12 42 02.322 +11 38 48.95   11.0       ~ 667 0
34 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1051 1
35 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4337 2

    Equat.    Gal    SGal    Ecl

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2021.04.14-14:08:18

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