The unusual tidal dwarf galaxy in the merger system NGC 3227/6. Star formation in a tidal shock?

Details The unusual tidal dwarf galaxy in the merger system NGC 3227/6. Star formation in a tidal shock? The unusual tidal dwarf galaxy in the merger system NGC 3227/6. Star formation in a tidal shock?

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..51m&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

J1023+1952 is a cloud of neutral hydrogen located at the base of a tidal tail, associated with the interacting Seyfert system NGC 3227/6 that was discovered by Mundell et al. and identified as a candidate tidal dwarf galaxy. Here we report the discovery of active star formation concentrated in the southern half of this cloud. We suggest that the localized star formation and lack of detectable old stellar population imply a tidal origin for J1023+1954 and that its star formation is shock-triggered by collapsing gaseous tidal debris. Such shock-triggering may provide a possible formation mechanism for the recently-discovered population of young extragalactic H II regions.

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