1998A&AS..127..397V


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.07CEST16:07:01

1998A&AS..127..397V - Astron. Astrophys., Suppl. Ser., 127, 397-408 (1998/February-1)

An HI line search for optically identified dwarf galaxy candidates in the M 81 group.

VAN DRIEL W., KRAAN-KORTEWEG R.C., BINGGELI B. and HUCHTMEIER W.K.

Abstract (from CDS):

Sensitive 21cm HI line observations were performed for 23 dwarf members and possible members of the nearby M 81 group of galaxies, including five objects of a clustering of extremely low-surface brightness objects of unknown nature. With the Nancay decimetric radio telescope the radial velocity range of -529 to 1826 km/s was searched to an rms noise of ∼2-4mJy. Only three objects were detected. However, their high radial velocities (between 600 and 1150km/s) show them to lie behind the M 81 group. These three objects, classified as dS0: (UGC 4998) and Im (Kar 1N and UGC 5658), have HI masses of 0.4, 1.6 and 2.0x108M, for the assumed distance of 4Mpc, and HI mass-to-blue light ratios of 0.04, 0.73 and 0.18M/L☉,B, respectively. Considering that half of the observed objects are classified as irregular dwarfs, hence expected to be relatively gas-rich, the resulting detection rate of about 1/3 is quite low. However, the mean redshift and velocity dispersion of the M 81 group (<V≥101km/s, σ=114km/s) suggest that the HI emission of low velocity HI-rich members of the M 81 group may still remain hidden within the strong Galactic HI emission (typically -150≲V≲115km/s) or, for the 6 dwarf candidates in the immediate vicinity of M 81, overshadowed by the very extended HI envelope encompassing M 81, M 82, NGC 3077, and NGC 2976 (-280≲V≲355km/s).

Abstract Copyright:

Journal keyword(s): galaxies: distances and redshifts - galaxies: irregular - galaxies: ISM - radio lines: galaxies - galaxies: clusters of: Name M 81 group

Nomenclature: Table 1, col.1: [B93] NN (Nos 1-41), No. 5 missing. Table 1, col.2: [VKB98] Anon N (Nos 1-7). Table 1, col.2: K68 NNNW (Nos 1N-8N).

Simbad objects: 41

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Number of rows : 41

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 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 712 2
2 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 192 1
3 UGC 4459 GiG 08 34 07.29 +66 10 54.6 15.39 15.03 14.70 14.49   ~ 302 2
4 UGC 4483 GiG 08 37 03.29 +69 46 29.2 15.70 15.46 14.98 14.89   ~ 272 0
5 UGC 4998 G 09 25 10.9154191264 +68 22 59.168319999 15.94 15.13 14.42 14.09   ~ 39 0
6 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 331 1
7 LEDA 27949 G 09 45 15.3 +69 23 21   16.9       ~ 19 0
8 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 603 1
9 LEDA 28163 G 09 47 53.9 +69 16 05   18.0       ~ 8 0
10 LEDA 28411 G 09 51 50.1 +72 05 00           ~ 13 0
11 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 84 1
12 NAME M 81-82 Group GrG 09 55 +69.1           ~ 649 0
13 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4059 5
14 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5451 6
15 LEDA 28731 G 09 57 03.0 +68 35 31   15.17       ~ 99 1
16 NAME Arp Loop G 09 57 29.0 +69 16 20           ~ 59 1
17 UGC 5336 G 09 57 32.1 +69 02 46 15.19 15.15 14.10 14.12   ~ 295 4
18 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 704 0
19 NAME Garland G 10 03 43.1 +68 41 32           ~ 54 2
20 LEDA 29231 G 10 04 40.3 +68 15 20   17.43 16.72     ~ 67 0
21 UGC 5428 G 10 05 06.2 +66 33 31 17.89 16.82 16.09 15.73   ~ 95 1
22 NAME M81 dwB G 10 05 30.44 +70 21 53.9 15.95 15.56 15.09 14.87   ~ 182 1
23 UGC 5442 G 10 07 01.70 +67 49 38.4 17.09 15.73 15.07 14.81   ~ 78 1
24 LEDA 30664 G 10 26 28.0 +67 39 35   15.8       ~ 72 1
25 UGC 5658 G 10 27 45.16 +71 14 13.9   17       ~ 13 0
26 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 617 1
27 UGC 5692 GiG 10 30 36.58 +70 37 06.0 14.81 13.69 13.01 12.73   ~ 117 0
28 LEDA 31286 G 10 34 31.9 +66 00 42   16.7       ~ 46 1
29 Anon 1045+65 G 10 48 48.3 +64 46 08           ~ 2 0
30 UGCA 220 GiG 10 49 22.7 +64 43 20   18       ~ 14 0
31 UGC 5918 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 134 0
32 [B93] 32 G 10 50 05.5 +64 44 06           ~ 1 0
33 LEDA 32467 GiG 10 50 17.5 +65 07 27           ~ 8 0
34 [B93] 34 G 10 50 29.2 +64 44 06           ~ 1 0
35 [B93] 35 G 10 50 35.2 +64 44 06           ~ 1 0
36 LEDA 32667 LSB 10 52 55.1 +69 32 46   17.2       ~ 78 1
37 [B93] 37 G 10 53 46.3 +65 15 02           ~ 1 0
38 [B93] 38 G 10 54 09.6 +65 01 01           ~ 2 0
39 LEDA 32757 GiG 10 54 21.8 +65 12 01           ~ 8 0
40 LEDA 32769 GiG 10 54 33.9 +65 17 01           ~ 3 0
41 LEDA 33305 G 11 02 22.3 +70 15 53   17.9       ~ 14 0

    Equat.    Gal    SGal    Ecl

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2021.05.07-16:07:01

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