2018MNRAS.474.3221M

Query : 2018MNRAS.474.3221M

2018MNRAS.474.3221M - Mon. Not. R. Astron. Soc., 474, 3221-3227 (2018/March-1)

Serendipitous discovery of a faint dwarf galaxy near a Local Volume dwarf.

MAKAROVA L.N., MAKAROV D.I., ANTIPOVA A.V., KARACHENTSEV I.D. and TULLY R.B.

Abstract (from CDS):

A faint dwarf irregular galaxy has been discovered in the HST/ACS field of LV J1157+5638. The galaxy is resolved into individual stars, including the brightest magnitude of the red giant branch. The dwarf is very likely a physical satellite of LV J1157+5638. The distance modulus of LV J1157+5638 using the tip of the red giant branch (TRGB) distance indicator is 29.82 ± 0.09 mag (D = 9.22 ± 0.38 Mpc). The TRGB distance modulus of LV J1157+5638 sat is 29.76 ± 0.11 mag (D = 8.95 ± 0.42 Mpc). The distances to the two galaxies are consistent within the uncertainties. The projected separation between them is only 3.9 kpc. LV J1157+5638 has a total absolute V magnitude of -13.26 ± 0.10 and linear Holmberg diameter of 1.36 kpc, whereas its faint satellite LV J1157+5638 sat has MV = -9.38 ± 0.13 mag and Holmberg diameter of 0.37 kpc. Such a faint dwarf was discovered for the first time beyond the nearest 4 Mpc from us. The presence of main-sequence stars in both galaxies unambiguously indicates the classification of the objects as dwarf irregulars with recent or ongoing star formation events in both galaxies.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: distances and redshifts - galaxies: dwarf - galaxies: individual: LV J1157+5638 - galaxies: stellar content

Nomenclature: [MMA2018] LV J1157+5638 sat N=1.

Simbad objects: 18

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Number of rows : 18
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 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 2784 EmG 09 12 19.497 -24 10 21.36 12.02 10.99 10.16 9.30   ~ 144 1
3 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
4 [SBS2017] d1005+68 G 10 05 31.820 +68 14 19.56           ~ 9 0
5 M 108 AGN 11 11 30.967 +55 40 26.84   10.70       ~ 497 1
6 LEDA 35433 AG? 11 29 54.052 +52 24 14.18           ~ 19 0
7 LEDA 2807144 G 11 50 05.1 +55 47 33   16.5       ~ 16 0
8 [MMA2018] LV J1157+5638 sat G 11 57 53.0 +56 36 49           ~ 6 0
9 LEDA 2543081 LSB 11 57 54.213 +56 38 16.77           ~ 28 0
10 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
11 NGC 4490 GiG 12 30 34.5 +41 38 26 10.03 10.22 9.79     ~ 616 3
12 NAME Local Supercluster SCG 12 31 +12.4           ~ 566 0
13 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 274 0
14 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
15 NGC 5195 GiG 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 816 3
16 NAME M101 Group GrG 14 03 +54.3           ~ 112 1
17 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
18 NAME Local Group GrG ~ ~           ~ 9325 0

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