2002A&A...396..473M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:00:09

2002A&A...396..473M - Astronomy and Astrophysics, volume 396, 473-487 (2002/12-3)

Tidal dwarfs in the M81 group: The second generation?

MAKAROVA L.N., GREBEL E.K., KARACHENTSEV I.D., DOLPHIN A.E., KARACHENTSEVA V.E., SHARINA M.E., GEISLER D., GUHATHAKURTA P., HODGE P.W., SARAJEDINI A. and SEITZER P.

Abstract (from CDS):

We derive quantitative star formation histories of the four suspected tidal dwarf galaxies in the M 81 group, Holmberg IX, BK3N, Arp-loop (A0952+69), and Garland, using Hubble Space Telescope/Wide Field Planetary Camera 2 images in F606W and F814W obtained as part of a Snapshot survey of dwarf galaxies in the Local Universe. We consider the spatial distribution and ages of resolved stellar populations in these dwarf irregular galaxies. We use synthetic color-magnitude diagrams to derive the ages of the major star formation episodes, star formation rates, and approximate metallicity ranges. All the galaxies show evidence of continuous star formation between about 20 and 200Myr ago with star formation rates in the range 7.5x10–3-7.6x10–4M/yr. The metallicity of the detected stars spans a wide range, and have lower than solar abundance. A possible scenario is that all four dwarf galaxies were formed from material in the metal-poor outer part of the giant spiral galaxy M 81 after the tidal interaction between M 81, M 82, and NGC 3077 ∼200Myr ago. While we do not directly detect pronounced old stellar populations, the photometric limits of our data are such that the presence of such a population is not entirely ruled out.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: photometry - galaxies: stellar content - galaxies: interactions - galaxies: individual: M 81 - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/396/473): table1a.dat table1b.dat table1c.dat table1d.dat>

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 580 1
2 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 84 1
3 NAME M 81-82 Group GrG 09 55 +69.1           ~ 634 0
4 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
5 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
6 NAME Arp Loop G 09 57 29.0 +69 16 20           ~ 59 1
7 UGC 5336 G 09 57 32.1 +69 02 46 15.19 15.15 14.10 14.12   ~ 291 4
8 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 691 0
9 NAME Garland G 10 03 43.1 +68 41 32           ~ 53 2
10 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:00:09

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