2008MNRAS.387L..45K


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.11CEST07:17:36

2008MNRAS.387L..45K - Mon. Not. R. Astron. Soc., 387, L45-L49 (2008/June-2)

VV124 (UGC4879): a new transitional dwarf galaxy in the periphery of the Local Group.

KOPYLOV A.I., TIKHONOV N.A., FABRIKA S., DROZDOVSKY I. and VALEEV A.F.

Abstract (from CDS):

We present the first photometry of individual stars within VV124 (UGC4879) and find that this is the most isolated dwarf galaxy in the periphery of the Local Group. This work is based on imaging and spectroscopic follow-up observations with the 6-m BTA telescope; we resolve VV124 into 1560 stars down to the limiting magnitude levels of V ≃ 25.6 and I ≃ 23.9. Young blue stellar populations and ionized gas are found near the core, but notably displaced from the centre of the galaxy as traced by dominant evolved red stars. The mean heliocentric radial velocity derived from the spectra of two blue supergiant stars and unresolved continuum sources is -70±15km/s. The evolved `red tangle' stellar populations, which contain the red giant branch (RGB), are identified at large galactocentric radii. We use the I-band luminosity function to determine the distance based on the Tip of RGB method, 1.1±0.1Mpc. This is ∼10 times closer than the values usually assumed in the literature, and we provide revised distance-dependent parameters. From the mean (V - I) colour of the RGB, we estimate the mean metallicity as [Fe/H] ≃ -1.37 dex. Despite its isolated location, the properties of VV124 are clearly not those of a galaxy in formation, but rather similar to a transitional dIrr/dSph type.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: distances and redshifts - galaxies: dwarf - galaxies: individual: VV124 (UGC4879) - Local Group - galaxies: stellar content

Nomenclature: Fig. 2: [KTF2008] blN (Nos bl1-bl2), [KTF2008] HII N=1.

Simbad objects: 29

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Number of rows : 29

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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 592 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1029 0
3 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 209 0
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11265 1
5 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 366 0
6 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1129 2
7 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5277 1
8 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 474 2
9 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 642 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15283 1
11 HD 269697 s*y 05 31 38.4228564397 -67 28 11.561399999 10.99 10.69 10.28     F6Ia 50 0
12 SDSS J091601.73+525026.0 * 09 16 01.742 +52 50 26.06     17.81   17.51 F5Ia 3 0
13 UGC 4879 G 09 16 02.0197873600 +52 50 42.052874443   14.0 13.2     ~ 108 0
14 SDSS J091602.19+525005.6 * 09 16 02.1952964723 +52 50 05.637616019     18.53   18.66 O9.5 4 0
15 [KTF2008] HII HII 09 16 03.69 +52 50 20.4           ~ 2 0
16 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 1007 1
17 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 319 0
18 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 557 0
19 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 480 0
20 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 704 2
21 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1082 1
22 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 665 2
23 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 282 1
24 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1457 0
25 HD 188209 s*b 19 51 59.0685711923 +47 01 38.420250587 4.61 5.55 5.63 5.54 5.64 O9.5Iab 294 0
26 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 401 1
27 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 274 0
28 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 427 1
29 NAME Local Group GrG ~ ~           ~ 7226 0

    Equat.    Gal    SGal    Ecl

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2021.04.11-07:17:36

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