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26 April 2024 |
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Star-formation in the HI bridge between M81 and M82 | | Duilia F. de Mello
; L. J. Smith
; E. Sabbi
; J.S. Gallagher
; M. Mountain
; D.R. Harbeck
; | | Date: |
16 Nov 2007 | | Abstract: | We present multi-wavelength observations of stellar features in the HI 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
observations. Four of these objects are also detected at Halpha. 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-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. | | Source: | arXiv, 0711.2685 | | Services: | Forum | Review | PDF | Favorites | |
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