John M. Cannon et al. 2004 ApJ 608 768 doi:10.1086/420868
Extended Tidal Structure in Two Lyα-emitting Starburst Galaxies
FREEJohn M. Cannon1, Evan D. Skillman1, Daniel Kunth2, Claus Leitherer3, Miguel Mas-Hesse4, Göran Östlin5 and Artashes Petrosian6
Show affiliationsWe present new Very Large Array (VLA) C-configuration H I imaging of the Lyα-emitting starburst galaxies Tol 1924-416 and IRAS 08339+6517. The effective resolution probes neutral gas structures larger than 4.7 kpc in Tol 1924-416 and larger than 8.1 kpc in IRAS 08339+6517. Both systems are revealed to be tidally interacting: Tol 1924-416 with ESO 338-IG04B (6
6 = 72 kpc minimum separation), and IRAS 08339+6517 with 2MASX J08380769+6508579 (24 = 56 kpc minimum separation). The H I emission is extended in these systems, with tidal tails and debris between the target galaxies and their companions. Since Lyα emission has been detected from both of these primary systems, these observations suggest that the geometry of the interstellar medium is one of the factors affecting the escape fraction of Lyα emission from starburst environments. Furthermore, these observations argue for the importance of interactions in triggering massive star formation events.
- Subject headings
galaxies: individual (Tol 1924–416, IRAS 08339+6517); galaxies: interactions; galaxies: starburst
- Dates
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Issue 2 (2004 June 20)
Received 2003 December 16, accepted for publication 2004 March 5
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Extended Tidal Structure in Two Lyα-emitting Starburst Galaxies
John M. Cannon et al. 2004 ApJ 608 768
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