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An ALMA-HST Study of Millimeter Dust Emission and Star Clusters by Turner, J. A.; Dale, D. A.; Adamo, A.; Calzetti, D.; Grasha, K.; Grebel, E. K.; Johnson, K. E.; Lee, J. C.; Smith, L. J.; Yoon, I. is a scholarly article available to read on EtoBox.

What is An ALMA-HST Study of Millimeter Dust Emission and Star Clusters about?

We present results from a joint ALMA-HST study of the nearby spiral galaxy NGC 628. We combine the HST LEGUS database of over 1000 stellar clusters in NGC 628 with ALMA Cycle 4 millimeter/submillimeter observations of the cold dust continuum that span ~15 square kpc including the nuclear region and western portions of the galaxy's disk. The resolution -- 1.1" or approximately 50 pc at the distance of NGC 628 -- allows us to constrain the spatial variations in the slope of the millimeter dust continuum as a function of the ages and masses of the nearby stellar clusters. Our results indicate an excess of dust emission in the millimeter assuming a typical cold dust model for a normal star-forming galaxy, but little correlation of the dust continuum slope with stellar cluster age or mass. For the depth and spatial coverage of these observations, we cannot substantiate the millimeter/submillimeter excess arising from the processing of dust grains by the local interstellar radiation field. We detect a bright unknown source in NGC 628 in ALMA bands 4 and 7 with no counterparts at other wavelengths from ancillary data. We speculate this is possibly a dust obscured supernova.

Author

Turner, J. A.; Dale, D. A.; Adamo, A.; Calzetti, D.; Grasha, K.; Grebel, E. K.; Johnson, K. E.; Lee, J. C.; Smith, L. J.; Yoon, I.

Published

2019

Language

EN