2017MNRAS.467.3751B

Query : 2017MNRAS.467.3751B

2017MNRAS.467.3751B - Mon. Not. R. Astron. Soc., 467, 3751-3758 (2017/May-3)

Redshift, metallicity and size of two extended dwarf Irregular galaxies: a link between dwarf Irregulars and ultra diffuse galaxies?

BELLAZZINI M., BELOKUROV V., MAGRINI L., FRATERNALI F., TESTA V., BECCARI G., MARCHETTI A. and CARINI R.

Abstract (from CDS):

We present the results of the spectroscopic and photometric follow-up of two field galaxies that were selected as possible stellar counterparts of local high-velocity clouds. Our analysis shows that the two systems are distant (D > 20 Mpc) dwarf irregular galaxies unrelated to the local H I clouds. However, the newly derived distance and structural parameters reveal that the two galaxies have luminosities and effective radii very similar to the recently identified ultra diffuse galaxies (UDGs). At odds with classical UDGs, they are remarkably isolated, having no known giant galaxy within ∼2.0 Mpc. Moreover, one of them has a very high gas content compared to galaxies of similar stellar mass, with a H Ito stellar mass ratio M_ H  I/M *_∼90, typical of almost-dark dwarfs. Expanding on this finding, we show that extended dwarf irregulars overlap the distribution of UDGs in the MV versus log re plane and that the sequence including dwarf spheroidals, dwarf irregulars and UDGs appears as continuously populated in this plane. This may suggest an evolutionary link between dwarf irregulars and UDGs.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): ISM: H ii regions - galaxies: dwarf - galaxies: star formation - galaxies: structure - galaxies: structure

Nomenclature: Fig. 1, Table 1: SECCO-dI-NA (Nos 1-2).

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Wolf-Lundmark-Melotte G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 691 2
2 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 778 2
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 152 0
4 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
6 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1503 2
7 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1236 2
8 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 378 0
9 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 932 0
10 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 769 2
11 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 220 0
12 SDSS J114325.36-013742.5 G 11 43 25.36 -01 37 42.6           ~ 2 0
13 SDSS J114428.88-012335.7 G 11 44 28.89 -01 23 35.7           ~ 2 0
14 APMUKS (BJ) B114159.94-003523.7 LSB 11 44 33.608 -00 52 05.18           ~ 10 0
15 SDSS J114640.78-011749.2 G 11 46 40.79 -01 17 49.3           ~ 2 0
16 SDSS J115406.35+000158.5 G 11 54 06.359 +00 01 58.54   18.85       ~ 7 0
17 [RDS2004] MGS sure 21 G 11 55 58.42 +00 02 35.3   19.2       ~ 10 0
18 IC 753 LIN 11 59 12.8830758720 -00 31 25.691979324   14.3       ~ 42 0
19 IC 3104 AG? 12 18 46.06 -79 43 33.9   13.65 12.8 12.04   ~ 85 1
20 SECCO 1 G 12 21 53.96 +13 27 36.5     19.9     ~ 23 0
21 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6645 0
22 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4803 2
23 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2187 2
24 NAME Local Group GrG ~ ~           ~ 8391 0

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