Rescuing the Initial Mass Function for Arp 78
We present deep R and narrowband [image] images of Arp 78 obtained with the WIYN 3.5 m telescope on Kitt Peak. GALEX observations had shown a very extended UV structure for this system, reaching beyond the optical radius of Arp 78 and also beyond its previously known H alpha radius. Our new [image]...
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| Veröffentlicht in: | The Astrophysical journal 2008-12, Vol.688 (2), p.L65-L68, Article L65 |
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| container_title | The Astrophysical journal |
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| creator | Kotulla, Ralf Fritze, Uta Gallagher III, John S |
| description | We present deep R and narrowband [image] images of Arp 78 obtained with the WIYN 3.5 m telescope on Kitt Peak. GALEX observations had shown a very extended UV structure for this system, reaching beyond the optical radius of Arp 78 and also beyond its previously known H alpha radius. Our new [image] data now show agreement not only with the spatial extent of the near- and far-UV maps, but also in terms of structural details. Star formation rates derived from L(H alpha ) and L(FUV) are in reasonable agreement, indicating that in this case the upper stellar IMF in the UV-bright outer arm is relatively normal. The star-forming sites in the outer arms are younger than [image]15 Myr and massive enough to properly sample the IMF up to high masses; their low optical visibility evidently is a property of their youth. |
| doi_str_mv | 10.1086/595582 |
| format | Article |
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| subjects | Astronomy Earth, ocean, space Exact sciences and technology |
| title | Rescuing the Initial Mass Function for Arp 78 |
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