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

Carole G. Mundell, P James, N. Loiseau, E. Schinnerer, D. Forbes

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

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.
Original languageEnglish
Title of host publicationAstrophysics & Space Science Library
Subtitle of host publicationVolume 329
EditorsR. de Grijs, R. M. Gonzalez Delgado
Place of PublicationDordrecht, Germany
PublisherSpringer
Pages51
Publication statusPublished - 2005

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    Mundell, C. G., James, P., Loiseau, N., Schinnerer, E., & Forbes, D. (2005). The unusual tidal dwarf galaxy in the merger system NGC 3227/6. Star formation in a tidal shock? In R. de Grijs, & R. M. Gonzalez Delgado (Eds.), Astrophysics & Space Science Library: Volume 329 (pp. 51). Springer.