2009A&A...498..407G


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.25CET21:12:35

2009A&A...498..407G - Astronomy and Astrophysics, volume 498, 407-417 (2009/5-1)

The HI content of early-type galaxies from the ALFALFA survey. II. The case of low density environments.

GROSSI M., DI SEREGO ALIGHIERI S., GIOVANARDI C., GAVAZZI G., GIOVANELLI R., HAYNES M.P., KENT B.R., PELLEGRINI S., STIERWALT S. and TRINCHIERI G.

Abstract (from CDS):

We present the analysis of the Hi content of a sample of early-type galaxies (ETGs) in low-density environments (LDEs) using the data set provided by the Arecibo Legacy Fast ALFA (ALFALFA) survey. We compare their properties to the sample in the Virgo cluster that we studied in a previous paper (di Serego Alighieri et al., 2007A&A...474..851D, Paper I). Our aim is both to investigate how the cool interstellar medium (ISM) of these systems depends on the galaxy mass and the environment and to relate the properties of the neutral hydrogen to the warm phases of the ISM.We have selected a sample of 62 nearby ETGs (V<3000km/s) in an area of the sky where the ALFALFA data are already available (8h<RA<16h, 4°<Dec<16°), avoiding the region of the Virgo cluster. Among these, 39 have absolute B magnitudes fainter than MB=-17. Fifteen out of 62 galaxies have been firmly detected with ALFALFA (∼25%). Five additional galaxies show a weaker Hi emission (S/N∼4) and they will need deeper observations to be confirmed. Eight objects had 21-cm measurements reported in the literature. One by one comparison with the available material confirms, as expected, that ALFALFA data are, with rare exceptions, of equal or better quality than the best spectra previously obtained for these objects. All together, our analysis doubles the number of known gas-rich ETGs in this area. The Hi detection rate is 44% in luminous ETGs (MB←17) and 13% in dwarf ETGs (MB>-17). In both cases it is 10 times higher than that of the Virgo cluster. The presence of gas can be related to a recent star formation activity: 60% of all ETGs with Hi have optical emission line ratios typical of star-forming galaxies and blue colours suggesting the presence of young stellar populations, especially in the dwarf subsample.We show that the Hi detection rate of ETGs depends both on the environment and mass. The fraction of early-type systems with neutral hydrogen is higher in more massive objects when compared to early-type dwarfs. The ETGs in LDEs seem to have more heterogeneous properties than their Virgo cluster counterparts, since they are able to retain a cold interstellar gas component and to support star formation activity even at recent epochs.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: ISM

CDS comments: Fig.3, paragraph 3.1 SDSS J094056.3+050240.5 is probably SDSS J094056.43+050243.2 in Simbad.

Simbad objects: 78

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Number of rows : 78

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 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 738 1
2 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1228 1
3 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 467 0
4 UGC 4590 GiG 08 46 39.910 +13 12 48.78   15.0       ~ 20 0
5 2MASX J08464735+1342247 GiG 08 46 47.2899222223 +13 42 24.518282935   15.5       ~ 17 0
6 UGC 4599 GiG 08 47 41.6905734171 +13 25 08.834418947   14.9       ~ 39 0
7 SDSS J093155.94+073210.3 G 09 31 55.932 +07 32 10.25           ~ 3 0
8 SDSS J093208.81+082810.8 G 09 32 08.809 +08 28 10.80           ~ 2 0
9 Mrk 706 G 09 34 03.142 +11 00 21.51   15.2       ~ 14 0
10 LEDA 1297331 G 09 36 08.586 +06 15 25.44           ~ 8 0
11 LGG 178 GrG 09 40 30.8 +05 00 51           ~ 3 0
12 NGC 2962 GiP 09 40 53.9319870230 +05 09 57.021439517   13.1       ~ 183 0
13 LEDA 1277283 G 09 40 56.429 +05 02 43.23           ~ 7 0
14 NGC 2966 GiP 09 42 11.484 +04 40 23.35   14.0       ~ 100 0
15 SDSS J094218.94+044121.8 G 09 42 18.945 +04 41 21.81           ~ 2 0
16 LEDA 1416616 GiP 09 50 36.256 +12 48 32.64           ~ 6 0
17 MCG+02-26-013 G 09 59 43.4930133004 +11 39 38.641090363   14.6       ~ 39 0
18 2MASX J10055117+1257403 Sy2 10 05 51.1828579005 +12 57 40.701906903   15.3       ~ 49 0
19 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1077 1
20 SDSS J102326.34+123542.5 G 10 23 26.333 +12 35 42.50           ~ 2 0
21 SDSS J102339.36+123725.5 G 10 23 39.359 +12 37 25.55           ~ 3 0
22 LEDA 1441580 G 10 41 40.967 +13 49 29.71           ~ 5 0
23 SDSS J104435.27+135622.7 G 10 44 35.276 +13 56 22.75           ~ 7 0
24 LEDA 83329 LSB 10 46 14.4 +12 57 34   18.7 17.8   17.4 ~ 14 0
25 LEDA 83336 GiG 10 46 41.316 +12 19 37.37   16.98       ~ 16 0
26 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 735 1
27 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1392 0
28 NAME M96 Group GrG 10 48 +13.3           ~ 283 0
29 NGC 3384 GiG 10 48 16.897 +12 37 45.48   10.0       ~ 558 1
30 2MASX J10485371+1407277 GiG 10 48 53.7520057230 +14 07 28.263002097   15.5       ~ 16 0
31 SDSS J104926.70+121528.0 G 10 49 26.702 +12 15 28.01           ~ 3 0
32 UGC 5944 LSB 10 50 18.960 +13 16 18.69   15.7       ~ 28 0
33 NGC 3412 GiG 10 50 53.313 +13 24 43.71 11.84 11.45 10.54     ~ 222 1
34 LEDA 83364 GiG 10 51 01.500 +13 20 00.52   17.0       ~ 16 0
35 SDSS J105131.35+140653.2 G 10 51 31.345 +14 06 53.17           ~ 8 0
36 SDSS J105204.79+150149.7 G 10 52 04.791 +15 01 49.65           ~ 8 0
37 LEDA 1388083 G 10 52 19.504 +11 02 35.54           ~ 9 0
38 UGC 6062 G 10 58 37.5654170345 +09 03 01.599767118   13.7       ~ 57 0
39 NGC 3489 GiG 11 00 18.5473550222 +13 54 04.215155077 11.46 11.12 10.29     ~ 366 1
40 IC 676 GiG 11 12 39.8140774166 +09 03 19.836734750   13.4       ~ 124 0
41 NGC 3593 GiG 11 14 36.9733686308 +12 49 05.505076217   11.8       ~ 329 2
42 SDSS J111445.02+123851.7 G 11 14 45.019 +12 38 51.70           ~ 10 0
43 IC 2684 GiC 11 17 01.049 +13 05 58.69   15.4       ~ 20 0
44 SDSS J111701.17+043944.2 G 11 17 01.174 +04 39 44.22           ~ 6 0
45 NAME M 66 Group GrG 11 22.0 +11 55   8.8       ~ 11 0
46 LEDA 1420152 G 11 22 24.0247118242 +12 58 46.365740581           ~ 9 0
47 IC 2782 GiG 11 22 55.192 +13 26 26.63   15.2       ~ 23 0
48 IC 2787 GiG 11 23 19.077 +13 37 47.20   15.5       ~ 32 0
49 IC 692 GiG 11 25 53.492 +09 59 14.16   14.1       ~ 44 0
50 NGC 3773 H2G 11 38 12.967 +12 06 42.91   13.1       ~ 176 0
51 IC 718 G 11 39 52.762 +08 52 28.16   14.6       ~ 41 0
52 IC 719 G 11 40 18.490 +09 00 35.50   13.6       ~ 107 0
53 Mrk 747 GiC 11 41 50.621 +15 58 25.43   14.5       ~ 48 0
54 2MASX J11434609+1342273 G 11 43 46.1197197407 +13 42 27.295139748           ~ 10 0
55 SDSS J114516.17+135221.1 G 11 45 16.175 +13 52 21.16           ~ 3 0
56 2MASX J11460404+1134529 G 11 46 04.047 +11 34 52.70           ~ 12 0
57 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1022 1
58 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5979 0
59 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6348 3
60 NGC 4880 GiG 13 00 10.5730220026 +12 28 59.908218984   13.3       ~ 78 0
61 SDSS J134757.45+041850.6 G 13 47 57.445 +04 18 50.60           ~ 2 0
62 LEDA 1283560 G 13 51 42.9024212816 +05 26 47.371658882           ~ 4 0
63 MAPS-NGP O-559-1243538 G 13 52 05.636 +05 45 54.14           ~ 2 0
64 UGC 8799 G 13 53 19.84 +05 46 17.9   16.5       ~ 14 0
65 NGC 5338 G 13 53 26.5501298404 +05 12 27.952720100   14.3       ~ 99 0
66 LEDA 1277985 GiP 13 55 02.6998429161 +05 05 25.249562372           ~ 6 0
67 SDSS J135621.31+051944.2 G 13 56 21.316 +05 19 44.25           ~ 2 0
68 LEDA 49602 G 13 56 55.5773577118 +05 09 06.834605413   15.7       ~ 6 0
69 SDSS J135723.57+053425.2 G 13 57 23.570 +05 34 25.21           ~ 4 0
70 UGC 8986 G 14 04 15.8456158276 +04 06 43.854697826   14.10       ~ 28 1
71 SDSS J142043.54+040837.0 G 14 20 43.544 +04 08 37.08           ~ 2 0
72 NGC 5701 GiG 14 39 11.0762411300 +05 21 48.498854025 12.03 11.76 10.88     ~ 225 1
73 SDSS J144329.18+043153.4 G 14 43 29.200 +04 31 53.91           ~ 6 0
74 NGC 5770 GiG 14 53 15.0123896704 +03 57 35.041690491 13.49 13.15 12.26     ~ 95 1
75 SDSS J152655.37+094657.5 G 15 26 55.3724024130 +09 46 57.520995539           ~ 3 0
76 IC 1131 GiP 15 38 51.6972918403 +12 04 50.250219598   14.8       ~ 27 0
77 NGC 6014 G 15 55 57.4089407867 +05 55 55.139745695   13.8       ~ 84 0
78 NAME Local Group GrG ~ ~           ~ 7181 0

    Equat.    Gal    SGal    Ecl

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2021.02.25-21:12:35

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