2019A&A...625A..94H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:43:41

2019A&A...625A..94H - Astronomy and Astrophysics, volume 625A, 94-94 (2019/5-1)

Young stellar populations in early-type dwarf galaxies. Occurrence, radial extent, and scaling relations.

HAMRAZ E., PELETIER R.F., KHOSROSHAHI H.G., VALENTIJN E.A., DEN BROK M. and VENHOLA A.

Abstract (from CDS):


Aims. To understand the stellar population content of early-type dwarf galaxies (dEs) and their environmental dependence, we compare the slopes and intrinsic scatter of color-magnitude relations (CMRs) for three nearby clusters, Fornax, Virgo, and Coma. Additionally, we present and compare internal color profiles of these galaxies to identify central blue regions with younger stars.
Methods. We use the imaging of the HST/ACS Fornax cluster in the magnitude range of -18.7≤Mg'≤-16.0 to derive magnitudes, colors, and color profiles, which we compare with literature measurements from the HST/ACS Virgo and Coma Cluster Survey. We take advantage of HST accuracy to investigate and parameterize the (g'-z') color profiles of these dEs.
Results. Based on analysis of the color profiles, we report on a large number of dEs with young stellar populations at their center in all three clusters. While for Virgo and Coma the number of blue-cored dEs is found to be 85%±2% and 53%±3%, respectively, for Fornax, we find that all galaxies have a blue core. We show that bluer cores reside in fainter dEs, similar to the trend seen in nucleated dEs. We find no correlation between the luminosity of the galaxy and the size of its blue core. Moreover, a comparison of the CMRs of the three clusters shows that the scatter in the CMR of Virgo is considerably larger than in the Fornax and Coma clusters. Presenting adaptive smoothing we show that the galaxies on the blue side of the CMR often show evidence for dust extinction, which strengthens the interpretation that the bluer colors are due to young stellar populations. We also find that outliers on the red side of the CMR are more compact than what is expected for their luminosity. We find several of these red outliers in Virgo, often close to more massive galaxies. No red outlying compact early-types are found in Fornax and Coma in this magnitude range while we find three in the Virgo cluster. We show that the CMR of the Fornax and Virgo clusters are slightly bluer than that of Coma. We suggest that the large number of outliers and larger scatter found for Virgo CMR are a result of the alternative assembly history of this cluster.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: clusters: general - galaxies: dwarf - galaxies: photometry - galaxies: star formation - galaxies: evolution - Galaxy: center

VizieR on-line data: <Available at CDS (J/A+A/625/A94): table2.dat table4.dat table5.dat>

CDS comments: Table A.1 not in SIMBAD.

Simbad objects: 94

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Number of rows : 94

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1207 1
2 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2009 2
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10901 1
4 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
5 ESO 301-8 GiC 03 22 22.92 -37 23 50.3   15.59   14.41   ~ 30 0
6 ESO 357-25 GiC 03 23 37.277 -35 46 42.17   14.98   14.12   ~ 39 1
7 2MASX J03262503-3707417 GiC 03 26 25.0079447333 -37 07 41.559095652   16.09       ~ 30 0
8 ESO 358-6 GiG 03 27 18.048 -34 31 35.15   14.15   12.95   ~ 79 0
9 MCG-06-08-024 GiG 03 31 08.256 -36 17 24.40   14.60       ~ 48 1
10 MCG-06-08-025 GiG 03 31 24.8273639621 -35 19 51.507886189   14.70       ~ 38 0
11 6dFGS gJ033147.6-350305 GiC 03 31 47.67 -35 03 05.5   15.27       ~ 42 0
12 6dFGS gJ033247.7-341419 LSB 03 32 47.637 -34 14 19.45   15.25       ~ 32 0
13 6dFGS gJ033333.9-333423 GiG 03 33 33.5 -33 34 19   15.11       ~ 37 0
14 MCG-06-08-027 GiG 03 34 29.474 -35 32 47.03   14.50       ~ 71 1
15 NGC 1373 GiP 03 34 59.208 -35 10 16.25 14.44 14.03 13.26     ~ 103 1
16 NGC 1375 GiG 03 35 16.8019706983 -35 15 56.379169010 13.50 13.02 12.40 11.74   ~ 140 1
17 ESO 358-25 GiG 03 35 33.134 -32 27 53.55   13.90       ~ 73 0
18 MCG-06-09-008 GiP 03 36 54.315 -35 22 29.04   14.81       ~ 66 2
19 NGC 1382 GiP 03 37 08.953 -35 11 42.09 13.19 13.79 12.92 12.31   ~ 99 1
20 NGC 1396 GiG 03 38 06.5660885410 -35 26 23.636856735   14.80       ~ 78 1
21 ESO 358-42 GiC 03 38 09.142 -34 31 06.73   15.74   14.44   ~ 47 1
22 ESO 358-43 GiG 03 38 13.5995395741 -33 07 37.982728696   15.26   13.94   ~ 47 0
23 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1538 0
24 NGC 1419 GiG 03 40 42.120 -37 30 39.09   13.56   12.07   ~ 113 0
25 ESO 358-50 GiG 03 41 03.608 -33 46 45.51   13.86   12.57   ~ 62 0
26 NGC 1428 GiG 03 42 22.9 -35 09 12   13.77   12.49   ~ 86 0
27 ESO 358-56 GiP 03 43 22.631 -33 56 25.30   15.58   14.33   ~ 44 0
28 ESO 358-59 GiG 03 45 03.554 -35 58 21.37   14.08   12.85   ~ 95 0
29 2MASX J03451407-3656123 GiC 03 45 14.0931638772 -36 56 12.022631568   15.32       ~ 49 0
30 NGC 1460 GiG 03 46 13.751 -36 41 46.71   13.52   12.12   ~ 53 0
31 ESO 358-66 GiC 03 47 52.669 -36 28 18.07   15.65   14.24   ~ 42 0
32 ESO 359-2 GiG 03 50 36.723 -35 54 33.51   14.48   13.49   ~ 67 0
33 NAME M96 Group GrG 10 48 +13.3           ~ 278 0
34 IC 3019 GiG 12 09 22.257 +13 59 32.73   15.0       ~ 95 0
35 IC 3025 GiG 12 10 23.189 +10 11 18.62   15.3       ~ 71 0
36 IC 3032 GiG 12 11 07.764 +14 16 30.17   15.3       ~ 71 0
37 IC 3065 GiG 12 15 12.543 +14 25 58.26   14.7       ~ 77 0
38 LEDA 39199 G 12 15 25.687 +09 35 44.35           ~ 5 0
39 MCG+02-31-076 GiG 12 16 33.691 +13 01 52.48   15.2       ~ 62 0
40 UGC 7399 A GiG 12 20 48.757 +17 29 14.14   15.1       ~ 83 0
41 UGC 7436 GiP 12 22 19.530 +14 45 38.11   15.2       ~ 116 0
42 2MASX J12224115+0757011 GiG 12 22 41.151 +07 57 01.12   15.3       ~ 51 0
43 NGC 4352 GiG 12 24 05.0219273303 +11 13 05.088363600   14.0       ~ 145 0
44 IC 3292 GiG 12 24 48.369 +18 11 42.28   15.5       ~ 74 0
45 NGC 4377 GiG 12 25 12.308 +14 45 43.98   12.5       ~ 202 0
46 NGC 4387 GiG 12 25 41.6768872639 +12 48 37.809497625 13.42 13.01 12.12   10.87 ~ 368 1
47 IC 3328 GiP 12 25 57.964 +10 03 13.37   14.9       ~ 144 0
48 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5823 0
49 NGC 4434 GiG 12 27 36.680 +08 09 15.52   13.2       ~ 231 0
50 UGC 7580 GiG 12 27 54.833 +08 05 25.68   15.2 14.72     ~ 65 0
51 IC 3383 GiG 12 28 12.3163075226 +10 17 51.447384346   15.5 15.18     ~ 76 0
52 IC 3381 LSB 12 28 14.854 +11 47 23.69   14.42       ~ 141 1
53 NGC 4452 GiG 12 28 43.2984054035 +11 45 18.204118555 13.27 12.87 11.98     ~ 182 1
54 NGC 4458 GiP 12 28 57.532 +13 14 30.90 13.27 12.93 12.07     ~ 388 2
55 NGC 4464 GiG 12 29 21.313 +08 09 23.63   13.5       ~ 216 0
56 NGC 4467 GiG 12 29 30.267 +07 59 34.62   15.2       ~ 160 0
57 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1958 2
58 NGC 4482 GiG 12 30 10.3250399673 +10 46 46.084712572   14.2       ~ 149 0
59 NGC 4479 GiG 12 30 18.343 +13 34 38.88 13.73 13.40 12.44     ~ 165 2
60 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 380 0
61 NGC 4483 GiG 12 30 40.620 +09 00 56.39   13.4       ~ 145 0
62 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6206 3
63 UGC 7658 GiG 12 30 57.730 +12 16 13.30   11.2       ~ 208 0
64 IC 3442 GiG 12 31 20.1847539251 +14 06 54.716926859   15.4       ~ 91 0
65 IC 3461 GiG 12 32 02.747 +11 53 23.16   15.4 14.88   13.3 ~ 117 0
66 IC 3468 GiG 12 32 14.209 +10 15 05.55   14.6       ~ 120 0
67 IC 3470 GiP 12 32 23.353 +11 15 47.56   15.0       ~ 103 0
68 IC 798 GiG 12 32 33.398 +15 24 55.78   15.3       ~ 89 0
69 NGC 4515 GiG 12 33 04.944 +16 15 55.76   13.3       ~ 133 0
70 IC 3487 GiG 12 33 13.601 +09 23 49.76   15.1       ~ 70 0
71 IC 3492 GiC 12 33 19.772 +12 51 12.77   15 15.30     ~ 75 0
72 IC 3501 GiG 12 33 51.606 +13 19 21.35   15.0       ~ 86 0
73 NGC 4528 GiG 12 34 06.006 +11 19 18.90 13.39 12.97 12.06     ~ 167 1
74 IC 3506 GiC 12 34 06.739 +12 44 29.75   16.67 15.93   14.1 ~ 81 0
75 IC 3509 GiG 12 34 11.565 +12 02 55.89   15.3       ~ 100 0
76 2MASX J12353723+1222554 GiP 12 35 37.2509396284 +12 22 55.233540771   15.41       ~ 83 0
77 NGC 4551 GiP 12 35 37.980 +12 15 50.44 13.49 12.97 12.02     ~ 332 1
78 LEDA 42046 G 12 36 24.781 +10 23 04.75   16       ~ 70 0
79 IC 3586 GiG 12 36 54.858 +12 31 12.49   15.3       ~ 84 0
80 IC 3612 G 12 39 04.6879834542 +14 43 45.574928192   15.4       ~ 64 0
81 IC 3635 GiG 12 40 13.334 +12 52 29.98   15.5       ~ 69 0
82 MCG+03-32-082 G 12 40 19.651 +15 56 06.97   14.9       ~ 54 0
83 IC 3647 GiG 12 40 52.684 +10 28 35.51   15.3       ~ 64 0
84 IC 3652 GiG 12 40 58.5600973863 +11 11 04.081313393   15.1       ~ 102 0
85 IC 3653 GiG 12 41 15.721 +11 23 13.85   14.7       ~ 102 0
86 UGC 7854 G 12 41 51.987 +09 24 10.20   15.3       ~ 68 0
87 IC 3672 GiG 12 42 08.6669706774 +11 45 15.437359667   15.1       ~ 98 0
88 NGC 4623 GiG 12 42 10.704 +07 40 36.96   13.24       ~ 177 1
89 IC 3735 G 12 45 20.376 +13 41 33.74   15.1       ~ 77 0
90 IC 3773 GiG 12 47 15.264 +10 12 12.40   14.3       ~ 115 0
91 IC 3779 GiG 12 47 20.281 +12 09 59.58   15.5     13.3 ~ 73 0
92 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
93 [HVH2010] Comai J130005.680+275535.32 ? 13 00 05.68 +27 55 35.3           ~ 1 0
94 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 380 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:43:41

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