2006MNRAS.368..864B

Query : 2006MNRAS.368..864B

2006MNRAS.368..864B - Mon. Not. R. Astron. Soc., 368, 864-876 (2006/May-2)

Neighbourhoods of isolated star forming dwarf galaxies.

BROSCH N., BAR-OR C. and MALKA D.

Abstract (from CDS):

We report the discovery of small groups of uncatalogued, compact, star forming (SF) dwarf galaxies (DGs) by Hα mapping of the neighbourhoods of apparently isolated, catalogued, SF DGs. Our sample consists of dwarf (M≥-18mag) galaxies at least 2Mpc away from any other catalogued galaxy. The galaxies were selected to exhibit Hα emission of any intensity, i.e. not selecting only strong starbursts, as an indicator of recent or on-going star formation with the goal of understanding why are they presently forming stars. We identified possible neighbours by imaging the galaxies and their surroundings through Hα filters centred at or near the redshift of the galaxy, and searching for localized Hα emission with the characteristics of the line emission from the sample galaxies.

We identified 20 possible SF neighbour galaxies, 17 of them not previously catalogued, in three of the five search fields where we had good quality data, and present here their positions and, images and morphology, as well as some indications of binarity. The relatively large number of possible neighbour candidates, combined with their relative faintness, argue that it would be virtually impossible to identify truly isolated galaxies. It seems that the objects we selected as extremely isolated are probably the brightest members of sparse groups of galaxies, where the other members are also DGs that are presently forming stars. In order to enhance the confidence of this statement regular redshifts are required for our candidate neighbours.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: formation - galaxies: dwarf - galaxies: formation - galaxies: irregular

Nomenclature: Table 4: [BBM2006] JHHMMSS+DDMMSS N=6+3+11.

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 - 2026 		#notes
1 LEDA 90602 Sy2 02 15 38.362 -10 04 54.33   17.89   15.30   ~ 20 0
2 2MASX J03021111+1555387 rG 03 02 11.1074190792 +15 55 38.773102980           ~ 15 1
3 GHO 031348+151348 ClG 03 16 36 +15 24.8           ~ 2 0
4 [BBM2006] J031650+152800 G 03 16 50.0 +15 28 00           ~ 1 0
5 [BBM2006] J031650+153128 G 03 16 50.0 +15 31 28           ~ 1 0
6 [BBM2006] J031652+153200 G 03 16 52.0 +15 32 00           ~ 1 0
7 [BBM2006] J031658+153154 G 03 16 58.0 +15 31 54           ~ 1 0
8 [BBM2006] J031700+153225 G 03 17 00.0 +15 32 25           ~ 1 0
9 Z 441-6 AG? 03 17 04.459 +15 29 04.31   14.7       ~ 26 0
10 [BBM2006] J031722+151421 G 03 17 22.0 +15 14 21           ~ 1 0
11 LEDA 2790884 QSO 08 25 55.5166210656 +35 32 31.833368556   18.2       ~ 128 1
12 QSO B1109+4642 QSO 11 12 41.3226119496 +46 26 34.780282764   19.27 18.67     ~ 16 0
13 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
14 NGC 3860 AGN 11 44 49.1676137928 +19 47 42.121734972 14.81 14.61   13.12   ~ 118 0
15 Z 98-100 H2G 12 13 06.5080889016 +17 05 56.208330636   15.4       ~ 28 1
16 LEDA 165108 GiC 12 22 24.473 +14 44 49.62           ~ 17 0
17 [BBM2006] J122233+144600 G 12 22 33.0 +14 46 00           ~ 1 0
18 [BBM2006] J122234+144818 G 12 22 34.0 +14 48 18           ~ 1 0
19 [BBM2006] J122235+144911 G 12 22 35.0 +14 49 11           ~ 1 0
20 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
21 NAME Bootes Void vid 14 52 +45.8           ~ 91 0
22 LEDA 99880 EmG 15 00 24.54815 +49 15 14.8888   16.78       ~ 18 1
23 LEDA 140506 EmG 15 20 50.167 +49 30 50.35   16.0       ~ 28 0
24 LEDA 3364286 G 15 41 23.62231 +55 37 42.6725           ~ 2 0
25 Z 297-30 G 15 51 23.7821537496 +61 04 50.075733828   15.3       ~ 9 0
26 SDSS J155309.67+564954.9 G 15 53 09.6772199232 +56 49 54.955864704           ~ 3 0
27 Z 298-6 G 15 57 55.752 +58 09 39.47   15.1       ~ 20 0
28 [BBM2006] J222805+024415 G 22 28 05.0 +02 44 15           ~ 1 0
29 LEDA 1229776 AGN 22 28 17.94312 +02 31 44.3532           ~ 10 0
30 [BBM2006] J222818+024126 G 22 28 18.0 +02 41 26           ~ 1 0
31 [BBM2006] J222829+024243 G 22 28 29.0 +02 42 43           ~ 1 0
32 [BBM2006] J222830+024340 G 22 28 30.0 +02 43 40           ~ 1 0
33 [BBM2006] J222830+024348 G 22 28 30.0 +02 43 48           ~ 1 0
34 [BBM2006] J222832+023949 G 22 28 32.0 +02 39 49           ~ 1 0
35 APMUKS (BJ) B222557.37+022417.5 G 22 28 33.0 +02 39 35           ~ 1 0
36 APMUKS (BJ) B222603.22+022700.2 G 22 28 36.0 +02 42 22           ~ 1 0
37 [BBM2006] J222838+023857 G 22 28 38.0 +02 38 57           ~ 1 0
38 LAMOST J222838.04+023202.5 QSO 22 28 38.0484873264 +02 32 02.467888404     18.93     ~ 20 0
39 [BBM2006] J222841+024323 G 22 28 41.0 +02 43 23           ~ 1 0
40 [BBM2006] J222841+024639 G 22 28 41.0 +02 46 39           ~ 1 0
41 NAME CFA Great Wall SCG ~ ~           ~ 142 0

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