Cool Dust in the Outer Ring of NGC 1291
J. L. Hinz, C. W. Engelbracht, R. Skibba, A. Crocker, J. Donovan, Meyer, K. Sandstrom, F. Walter, E. Montiel, B. D. Johnson, L. Hunt, G., Aniano, L. Armus, D. Calzetti, D. A. Dale, B. Draine, M. Galametz, B. Groves,, R. C. Kennicutt, S. E. Meidt, E. J. Murphy, F. Tabatabaei
TL;DR
This study uses Herschel Space Observatory images to analyze the distribution and temperature of cool dust in the outer ring of galaxy NGC 1291, revealing the ring's dominance in dust mass and its cooler temperature compared to the inner galaxy.
Contribution
It provides detailed measurements of dust mass and temperature in the outer ring of NGC 1291, highlighting the prominence of cool dust and its implications for galaxy structure.
Findings
The outer ring contains at least 70% of the galaxy's dust mass.
Dust in the ring is cooler (19.5K) than in the inner galaxy (25.7K).
The ring's dust dominates the galaxy's dust content.
Abstract
We examine Herschel Space Observatory images of one nearby prototypical outer ring galaxy, NGC 1291, and show that the ring becomes more prominent at wavelengths longer than 160um. The mass of cool dust in the ring dominates the total dust mass of the galaxy, accounting for at least 70% of it. The temperature of the emitting dust in the ring (T=19.5+/-0.3K) is cooler than that of the inner galaxy (T=25.7+/-0.7K). We discuss several explanations for the difference in dust temperature, including age and density differences in the stellar populations of the ring versus the bulge.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Astronomy and Astrophysical Research