2005A&A...443...91P


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET10:06:57

2005A&A...443...91P - Astronomy and Astrophysics, volume 443, 91-102 (2005/11-3)

Study of DDO 68: nearest candidate for a young galaxy?

PUSTILNIK S.A., KNIAZEV A.Y. and PRAMSKIJ A.G.

Abstract (from CDS):

We present the results of optical spectroscopy and imaging with the SAO 6m telescope for the dwarf galaxy DDO 68 (UGC 5340 = VV 542), falling into the region of very low density of luminous (L>L*) galaxies (Lynx-Cancer void). Its deep images in V,R bands and in the narrow Hα-filter show that this galaxy has the very irregular morphology, with a long curved tail on the South and a ring-like structure at the Northern edge. The latter consists of 5 separate regions, in three of which we could measure O/H by the classical Te method. Their weighted mean oxygen abundance corresponds to 12+log (O/H)=7.21±0.03, coincident within uncertainties with those for I Zw 18. The (V-R) colour of DDO 68 is rather blue all over the galaxy, indicating the youth of its stellar populations. Comparing the (V-R)0 colour of the underlying exponential disk of 0.12±0.04mag with the PEGASE.2 models for the evolving stellar clusters, we give the first estimate of the ages of the oldest stellar population, which needs confirmation by the other colours and the photometry of resolved stars. These ages are in the range of 200-900Myr for continuous star formation law, and ∼100-115Myr for the instantaneous starburst. We discuss the properties and the possible youth of this nearby object (∼2.3 times closer than the famous young galaxy I Zw 18) in the context of its atypical environment.

Abstract Copyright:

Journal keyword(s): galaxies: photometry - galaxies: evolution - galaxies: abundances - galaxies: interactions - galaxies: individual: DDO 68 - cosmology: large scale structure of Universe

Nomenclature: Fig.1: [PKP2005] knot N (Nos 1-7).

Simbad objects: 30

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Number of rows : 30

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 UGCA 20 bCG 01 43 14.6 +19 58 51   16       ~ 48 0
2 UGC 2684 G 03 20 23.71 +17 17 45.1   18       ~ 67 0
3 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 97 1
4 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 143 1
5 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 425 1
6 NAME Cancer Cluster ClG 08 20 54 +21 04.5           ~ 150 0
7 LEDA 2790884 bCG 08 25 55.521 +35 32 31.96   18.2       ~ 99 1
8 LEDA 24384 Sy1 08 40 29.9132803308 +47 07 10.244168570   18.2       ~ 59 0
9 NAME Lynx reg 08 47 +44.6           ~ 56 0
10 NGC 2683 AGN 08 52 41.345 +33 25 18.48 11.57 10.68 9.79 9.38   ~ 375 1
11 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 971 3
12 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 983 1
13 LEDA 27591 SBG 09 40 12.843 +29 35 30.30   16 16.08     ~ 37 0
14 [VV98] J095122.6+263513 QSO 09 51 22.5840 +26 35 13.786   17.66 17.31     ~ 91 1
15 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3918 5
16 UGC 5340 G 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55   ~ 170 1
17 UGC 5336 G 09 57 32.1 +69 02 46 15.19 15.15 14.10 14.12   ~ 285 4
18 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 540 0
19 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 457 0
20 UGC 5427 G 10 04 40.949 +29 21 51.54   15.2       ~ 51 0
21 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 642 2
22 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 596 0
23 NGC 3526 GiG 11 06 56.623 +07 10 26.12   13.70       ~ 98 0
24 NGC 3921 IG 11 51 06.8746094191 +55 04 43.392337063   13.4 12.64     ~ 233 0
25 NAME HI 1225+01 HI 12 27 19 +01 30.4           ~ 77 1
26 NAME HI 1225+01 Galaxy LSB 12 27 46.1 +01 36 01 15.45 16.02 15.92 15.73   ~ 36 0
27 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 434 0
28 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2198 2
29 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 659 1
30 HS 2236+1344 bCG 22 38 31.1190793853 +14 00 29.769874980           ~ 33 0

    Equat.    Gal    SGal    Ecl

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2020.01.29-10:06:58

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