2002ApJ...569..573T


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST01:08:15

2002ApJ...569..573T - Astrophys. J., 569, 573-581 (2002/April-3)

Squelched galaxies and dark halos.

TULLY R.B., SOMERVILLE R.S., TRENTHAM N. and VERHEIJEN M.A.W.

Abstract (from CDS):

There is accumulating evidence that the faint end of the galaxy luminosity function might be very different in different locations. The luminosity function might be rising in rich clusters and flat in regions of low density. If galaxies form according to the model of hierarchical clustering, then there should be many small halos compared to the number of big halos. If this theory is valid, then there must be a mechanism that eliminates at least the visible component of galaxies in low-density regions. A plausible mechanism is photoionization of the intergalactic medium at a time before the epoch that most dwarf galaxies form in low-density regions but after the epoch of formation for similar systems that ultimately end up in rich clusters. The dynamical timescales are found to accommodate this hypothesis in a flat universe with Ωm≲0.4. If small halos exist but simply cannot be located because they have never become the sites of significant star formation, they still might have dynamical manifestations. These manifestations are hard to identify in normal groups of galaxies because small halos do not make a significant contribution to the global mass budget. It could be entertained, however, that there are clusters of halos where there are only small systems, clusters that are at the low-mass end of the hierarchical tree. There may be places where only a few small galaxies managed to form, enough for us to identify and use as test probes of the potential. It turns out that such environments might be common. Four probable groups of dwarfs are identified within 5 Mpc, and the assumption that they are gravitationally bound suggests M/LB∼300-1200M/L, a factor of 6±2 times higher than typical values for groups with luminous galaxies.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Formation - Galaxies: Luminosity Function, Mass Function

Simbad objects: 53

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Number of rows : 53

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 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 718 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1031 0
3 NAME NGC 55 Group GrG 00 32 -29.7           ~ 10 0
4 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1235 1
5 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2038 2
6 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11298 1
7 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 384 2
8 NAME M31 Group GrG 00 47 28.6 +40 17 23           ~ 59 0
9 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3020 2
10 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1356 2
11 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 470 0
12 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5289 1
13 UGC 1281 LSB 01 49 31.71 +32 35 16.2   13.0       ~ 145 0
14 LEDA 166065 G 02 00 10.2 +28 49 53   17.2       ~ 51 0
15 NGC 784 LSB 02 01 16.932 +28 50 14.13 12.97 12.50 12.07 11.83   ~ 173 0
16 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1604 0
17 UGC 3755 G 07 13 51.66 +10 31 15.6   14.9       ~ 87 0
18 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 714 0
19 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1649 1
20 UGC 3974 G 07 41 56.3061361330 +16 48 07.439323443   15.4       ~ 207 0
21 [KK98a] 073940.2+164047 G 07 42 31.2 +16 33 40   15.6       ~ 43 0
22 UGC 4115 G 07 57 01.027 +14 23 47.66   16.0       ~ 132 0
23 LEDA 2806961 G 09 08 53.700 +14 35 02.05           ~ 36 0
24 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 603 1
25 NAME M 81-82 Group GrG 09 55 +69.1           ~ 649 0
26 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4059 5
27 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5450 6
28 NAME NGC 3109 Group GrG 09 59 35.2 -12 49 52           ~ 32 0
29 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 481 0
30 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 705 2
31 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 704 0
32 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 198 1
33 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 668 2
34 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 882 1
35 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 522 1
36 NGC 4395 Sy2 12 25 48.8639154223 +33 32 48.694684028 10.84 10.54 10.11 9.98   ~ 1029 1
37 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6025 0
38 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1039 1
39 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 136 0
40 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1260 2
41 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 444 0
42 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4348 2
43 UGC 8651 G 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 137 0
44 UGC 8760 G 13 50 51.3121098935 +38 01 14.956142286 15.56 14.78   14.33   ~ 132 0
45 UGC 8833 G 13 54 48.52 +35 50 14.5   16.5   15.20   ~ 100 1
46 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 389 0
47 IC 5152 G 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 220 1
48 ESO 407-18 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 144 0
49 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 966 2
50 NAME UGC 8760 Group GrG ~ ~           ~ 7 0
51 NAME UGC 3974 Group GrG ~ ~           ~ 8 0
52 NAME Local Group GrG ~ ~           ~ 7251 0
53 NAME NGC 784 Group GrG ~ ~           ~ 16 0

    Equat.    Gal    SGal    Ecl

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2021.05.06-01:08:15

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