2009MNRAS.398..722T

Query : 2009MNRAS.398..722T

2009MNRAS.398..722T - Mon. Not. R. Astron. Soc., 398, 722-734 (2009/September-2)

Dwarf galaxies in the NGC 1023 group.

TRENTHAM N. and TULLY R.B.

Abstract (from CDS):

We present a compilation of galaxies in the NGC 1023 Group, an accumulation of late-type galaxies at a distance of 10 Mpc. Members at high and intermediate luminosities were identified from their spectroscopic velocities. Members at low luminosities were identified from their morphologies on wide-field CCD images. The faint-end slope is in the range -1.27 < α < -1.12. There is evidence for two dwarf galaxy populations: one in the halo of NGC 1023 that is dominated by dwarf elliptical galaxies, and one in the infall region surrounding NGC 1023 that contains mainly dwarf irregular galaxies. Similar distinctive populations are observed in the Local Group.

Through our imaging surveys, a picture has emerged of the distributions and types of dwarf galaxies over a wide range of environments. Of greatest interest is a correlation between dwarf galaxy population and parent halo mass. The number of dwarfs per unit mass is constant over the range of halo masses 1012-1014M☉. There are small but significant variations in luminosity functions with location. These variations can be attributed to differences in the bright and intermediate luminosity populations. In less evolved regions marked by substantial populations of spirals, galaxies with intermediate luminosity are relatively common, and such regions have low mass-to-light ratios. In more evolved regions where spirals are absent, there is relative depletion at intermediate luminosities and, overall in such places, mass-to-light ratios are high. Statistics are still poor for regions outside of massive haloes but the faint-end slope of the luminosity function is comparable in the field with what is found in the massive haloes. Everywhere that has been studied, the faint-end slope is unequivocally shallower than the slope at low masses anticipated by hierarchical clustering theory. Though the slope is shallow, there is no hint of a cut-off down to an observational limit of MR = -10.


Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: clusters: individual: NGC 1023 Group - galaxies: luminosity function, mass function - galaxies: photometry

Nomenclature: Table 2: [TT2009] NN (Nos 1-65).

CDS comments: In table 2 coordinate error for [TT2009] 17: 2 25 00.2 +36 02 16 instead 2 25 00.2 +39 02 16.

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 - 2026 		#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
4 [TT2009] 56 G 02 20 02.9 +34 26 39       20.21   ~ 1 0
5 [TT2009] 45 G 02 20 50.9 +36 27 39       19.36   ~ 1 0
6 GSC2.3 NCIA018969 G 02 21 12.2 +42 21 50   17.97   16.85   ~ 10 0
7 MCG+07-05-040 AG? 02 21 13.40 +42 45 45.7   11.26   14.38   ~ 46 0
8 AGC 124811 G 02 21 35.5 +33 22 37       19.51   ~ 3 0
9 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
10 [CGG2021] dw0222p4242 G 02 22 55.2 +42 42 44   18.9   17.98   ~ 9 0
11 [TT2009] 46 G 02 24 02.4 +33 40 47       19.45   ~ 1 0
12 MCG+06-06-028 AG? 02 25 00.22 +36 02 16.0   16.5   14.78   ~ 46 0
13 ACO 347 ClG 02 25 50 +41 52.5           ~ 149 1
14 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 818 1
15 [TT2009] 40 G 02 27 20.4 +33 57 22       19.19   ~ 1 0
16 [TT2009] 28 G 02 27 35.8 +38 53 46       17.29   ~ 1 0
17 Z 504-86 GiG 02 27 49.7635 +31 43 30.264   15.4   14.2   ~ 42 0
18 [TT2009] 47 G 02 28 59.3 +37 01 45       19.44   ~ 1 0
19 [TT2009] 57 G 02 29 05.8 +37 39 05       20.14   ~ 1 0
20 [TT2009] 55 G 02 29 33.3 +41 57 08       20.11   ~ 1 0
21 NGC 949 GiG 02 30 48.6343005912 +37 08 11.754932532   12.667 11.975 11.490 10.790 ~ 152 0
22 [TT2009] 27 G 02 31 29.3 +40 37 12       17.25   ~ 1 0
23 [TT2009] 63 G 02 31 29.5 +40 27 34       21.10   ~ 1 0
24 NGC 959 GiG 02 32 23.9241457416 +35 29 40.455279636 12.87 12.95 12.38 11.79   ~ 123 1
25 [TT2009] 64 G 02 32 39.9 +41 42 21       21.19   ~ 1 0
26 MCG+06-06-054 AG? 02 32 54.00 +38 40 50.1   17   14.50   ~ 50 0
27 NAME Psc-Per Supercluster SCG 02 33.2 +41 37           ~ 444 1
28 Z 505-6 GiG 02 33 18.20 +33 29 28.0   14.9   13.59   ~ 91 0
29 [TT2009] 51 G 02 33 23.5 +34 17 05       19.58   ~ 1 0
30 Z 539-46 GiG 02 33 42.96 +40 31 41.2   15.0   13.45   ~ 71 0
31 [TT2009] 31 G 02 33 47.5 +40 31 07       18.18   ~ 1 0
32 [TT2009] 58 G 02 34 15.6 +32 52 22       20.33   ~ 1 0
33 [TT2009] 60 G 02 34 15.8 +32 52 22       20.75   ~ 1 0
34 [TT2009] 52 G 02 34 54.0 +33 04 47       19.77   ~ 1 0
35 [TT2009] 39 G 02 35 04.3 +33 03 12       19.22   ~ 1 0
36 [TT2009] 62 G 02 36 23.3 +40 40 12       21.11   ~ 1 0
37 IC 239 GiG 02 36 27.8262034392 +38 58 09.083372052   12.1   12.75   ~ 115 0
38 LEDA 2802360 G 02 37 18.6 +38 55 59       14.92   ~ 6 0
39 [HKK2009] dJ0237+4136 LSB 02 37 18.8 +41 36 07       18.43   ~ 2 0
40 [TT2009] 29 G 02 37 27.0 +39 22 46       17.65   ~ 1 0
41 [TT2009] 44 G 02 37 30.9 +39 47 45       19.38   ~ 1 0
42 [TT2009] 35 G 02 37 31.1 +39 37 48       18.45   ~ 1 0
43 [TT2009] 24 G 02 37 36.0 +34 46 06       16.72   ~ 1 0
44 [CGB2020] dw0237+3836 G 02 37 39.5 +38 36 01       18.39   ~ 4 0
45 [TT2009] 41 G 02 38 17.1 +40 53 53       19.24   ~ 1 0
46 [TT2009] 53 G 02 38 33.4 +37 05 53       19.72   ~ 1 0
47 [TT2009] 59 G 02 38 39.4 +40 15 04       20.44   ~ 1 0
48 Z 539-65 LSB 02 38 47.1100329768 +40 41 55.158034452   15.4   13.98   ~ 14 0
49 NGC 1003 GiG 02 39 16.893 +40 52 20.25   12.1   10.83   ~ 198 0
50 MATLAS-189 LSB 02 39 19.8 +39 26 02       18.90   ~ 6 0
51 2MASX J02392281+4034032 G 02 39 22.8007661928 +40 34 03.679283964           ~ 7 0
52 NAME NGC 1023 Group GrG 02 39 37.9 +39 20 51           ~ 81 0
53 [CGB2020] dw0239+3824 GiG 02 39 59.5 +38 24 07       21.05   ~ 3 0
54 Z 523-82 G 02 40 14.1653155104 +38 20 50.165957364   15.6       ~ 10 0
55 GALEXASC J024016.48+373731.1 GiG 02 40 17.00 +37 37 34.0       16.66   ~ 3 0
56 NGC 1023 AG? 02 40 24.0133575864 +39 03 47.663392896 10.91 10.35 9.35 7.83   ~ 689 2
57 Z 523-84 GiG 02 40 25.123 +38 33 48.02   14.9   13.99   ~ 27 0
58 [TT2009] 36 G 02 40 29.9 +40 53 37       18.78   ~ 1 0
59 [CGB2020] dw0240+3829 GiG 02 40 30.1 +38 29 39       19.52   ~ 3 0
60 NGC 1023D GiG 02 40 32.99 +38 54 00.9       16.51   ~ 18 0
61 NGC 1023A GiG 02 40 37.1 +39 03 33       14.52   ~ 52 1
62 NGC 1023C GiG 02 40 39.59 +39 22 47.2       16.31   ~ 14 0
63 NGC 1023B AG? 02 41 00.00 +39 04 19.0       16.35   ~ 12 0
64 MCG+06-06-074 GiG 02 41 15.50 +38 44 36.0   16.0   13.70   ~ 14 0
65 MATLAS-195 GiG 02 41 16.1 +39 23 48       21.37   ~ 4 0
66 [TT2002] NGC 1023 10 GiG 02 41 23.9 +39 55 46       19.25   ~ 2 0
67 Z 539-78 AG? 02 42 10.832 +43 21 18.38   14.6   13.6   ~ 22 0
68 [TT2009] 49 G 02 42 39.6 +41 22 45       19.58   ~ 1 0
69 [HKK2009] dJ0243+3759 LSB 02 43 02.0 +37 59 26       16.37   ~ 2 0
70 [TT2009] 43 G 02 43 24.5 +37 44 26       19.30   ~ 1 0
71 NGC 1058 Sy2 02 43 30.0264850248 +37 20 28.782851784   12.29 11.75 10.85   ~ 483 0
72 [TT2009] 54 G 02 43 56.5 +37 24 26       19.79   ~ 1 0
73 [TT2009] 37 G 02 45 09.4 +38 56 37       18.88   ~ 1 0
74 [TT2009] 26 G 02 45 50.0 +39 57 12       17.24   ~ 1 0
75 [TT2009] 32 G 02 46 48.4 +38 32 53       18.22   ~ 1 0
76 UGC 2254 AG? 02 47 21.70 +37 31 31.0   17   16   ~ 9 0
77 Z 524-20 GiP 02 47 55.4194406880 +37 32 18.528735876   14.3   12.8   ~ 131 0
78 LEDA 3096870 GiC 02 53 03.9 +41 42 01       17   ~ 4 0
79 2A 0251+413 ClG 02 54 26.6 +41 33 25           ~ 328 1
80 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
81 NAME NGC 1400 Group GrG 03 32 16.00 -18 33 54.0           ~ 75 0
82 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
83 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
84 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
85 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
86 NAME Local Supercluster SCG 12 31 +12.4           ~ 566 0
87 NGC 5353 rG 13 53 26.7104646981 +40 16 59.200050598   11.8   10.57   ~ 309 1
88 NGC 5354 LIN 13 53 26.7262413240 +40 18 09.928163700   12.3   10.64   ~ 169 0
89 HCG 68 CGG 13 53 40.9 +40 19 07     12.4     ~ 114 0
90 NGC 5390 LIN 13 55 39.9385716624 +40 27 42.380606592   12.81 11.93 10.04   ~ 373 1
91 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25           ~ 165 0
92 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2
93 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 424 1
94 NAME Local Group GrG ~ ~           ~ 9325 0

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