2008AJ....135..548D

Query : 2008AJ....135..548D

2008AJ....135..548D - Astron. J., 135, 548-554 (2008/February-0)

Star formation in the H I bridge between M81 and M82.

DE MELLO D.F., SMITH L.J., SABBI E., GALLAGHER J.S., MOUNTAIN M. and HARBECK D.R.

Abstract (from CDS):

We present multiwavelength observations of stellar features in the H I tidal bridge connecting M81 and M82 in the region called Arp's loop. We identify eight young star-forming regions from Galaxy Evolution Explorer ultraviolet (UV) observations. Four of these objects are also detected at Hα. We determine the basic star-formation history of Arp's loop using F475W and F814W images obtained with the Advanced Camera for Surveys on board the Hubble Space Telescope. We find both a young (<10 Myr) and an old (>1 Gyr) stellar population with a similar spatial distribution and a metallicity Z ∼ 0.004. We suggest that the old stellar population was formed in the stellar disk of M82 and/or M81 and ejected into the intergalactic medium during a tidal passage (∼ 200-300 Myr ago), whereas the young UV-bright stars have formed in the tidal debris. The UV luminosities of the eight objects are modest and typical of small clusters or OB associations. The tidal bridge between M81 and M82 therefore appears to be intermediate between the very low levels of star formation seen in the Magellanic bridge and actively star-forming tidal tails associated with major galaxy mergers.

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Journal keyword(s): galaxies: evolution - galaxies: general - galaxies: individual (M81, M82) - galaxies: interactions

Nomenclature: Fig.5, Table 1: [DSS2008] N (Nos 1-8).

Simbad objects: 31

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Number of rows : 31
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 HCG 100 CGG 00 01 19.783 +13 07 21.81           ~ 58 0
2 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NGC 520 AGN 01 24 35.07120 +03 47 32.6760 12.41 12.24 11.42     ~ 528 3
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
6 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
7 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
8 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
9 NAME HI Bridge between M81-82 reg 09 55.0 +69 40           ~ 3 0
10 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
11 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
12 [DSS2008] 3 UV 09 57 13.092 +69 16 24.54           ~ 1 0
13 [DSS2008] 2 UV 09 57 15.255 +69 16 43.09           ~ 1 0
14 [DSS2008] 1 UV 09 57 15.255 +69 16 43.09           ~ 1 0
15 [DSS2008] 4 UV 09 57 16.194 +69 16 24.51           ~ 1 0
16 [DSS2008] 5 UV 09 57 18.786 +69 16 24.54           ~ 1 0
17 NAME Arp Loop G 09 57 29.0 +69 16 20           ~ 71 1
18 [DSS2008] 6 UV 09 57 29.859 +69 16 00.74           ~ 2 0
19 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
20 [DSS2008] 8 UV 09 57 33.714 +69 17 47.51           ~ 2 0
21 [DSS2008] 7 UV 09 57 34.545 +69 17 39.80           ~ 2 0
22 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
23 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
24 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
25 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
26 NGC 4676A AGN 12 46 10.05987 +30 43 54.6380           ~ 286 2
27 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 318 0
28 NGC 5713 GiG 14 40 11.528 -00 17 21.16 11.88 11.84 11.20     ~ 421 2
29 NGC 7252 AGN 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 720 1
30 MCG-01-60-021 LIN 23 41 47.285 -03 40 01.90 14.88 14.50 13.57     ~ 95 1
31 NGC 7769 LIN 23 51 03.9747703056 +20 09 01.552564620   12.77       ~ 157 2

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