| Autor: |
Graeme Salter, Timothy Goodsall, Roger L. Davies, Matthias Tecza, Fraser Clarke, Niranjan Thatte, Lisa Fogarty, Susan A. Kassin, Ryan C. W. Houghton |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society. 417:835-844 |
| ISSN: |
0035-8711 |
| DOI: |
10.1111/j.1365-2966.2011.19066.x |
| Popis: |
We present observations of Arp 147, a galaxy system comprising a collisionally-created ring galaxy and an early-type galaxy, using the Oxford SWIFT integral field spectrograph (IFS) at the 200-inch Hale telescope. We derive spatially resolved kinematics from the IFS data and use these to study the interaction between the two galaxies. We find the edge-to-edge expansion velocity of the ring is 225 +/- 8 km/s, implying an upper limit on the timescale for the collision of 50 Myrs. We also calculate that the angle of impact for the collision is between 33 degrees-54 degrees, where 0 degrees would imply a perpendicular collision. The ring galaxy is strongly star-forming with the star formation likely to have been triggered by the collision between the two galaxies. We measure some key physical parameters in an integrated and spatially resolved manner for the ring galaxy. Using observed B-I colours and the H-alpha equivalent widths, we conclude that two stellar components (a young and an old population) are required to simultaneously match both observed quantities. We constrain the age range, light and mass fractions of the young star formation in the ring, finding a modest age range, a light fraction of less than a third, and a negligible ( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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