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The HASHTAG project: The first submillimeter images of the Andromeda Galaxy from the ground.

Smith, M. W. L. ORCID:, Eales, S. A. ORCID:, Williams, T. G., Lee, B., Li, Z., Barmby, P., Bureau, M., Chapman, S., Brian, C. S., Chung, A., Chung, E. J., Chung, H., Clark, C. J. R., Clements, D. L., Davis, T. A. ORCID:, De Looze, I., Eden, D. J., Athikkat Eknath, Gayathri, Ford, G. P., Gao, Y., Gear, W., Gomez, H. L. ORCID:, De Grijs, R., He, J., Ho, L.C., Hughes, T. M., Jiao, S., Li, Z., Kemper, F., Kirchschlager, F., Koch, E. W., Kong, A. K. H., Lee, C., Lin, E., Mairs, S., Michalowski, M. J., Pattle, K., Peng, Y., Ragan, S. E. ORCID:, Rawlings, M. G., Rigopoulou, D., Saintonge, A., Schruba, A., Tang, X., Wang, J., Whitworth, A. P. ORCID:, Wilson, C. D., Yim, K. and Zhu, M. 2021. The HASHTAG project: The first submillimeter images of the Andromeda Galaxy from the ground. Astrophysical Journal Supplement Series 257 , 52. 10.3847/1538-4365/ac23d0

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Observing nearby galaxies with submillimeter telescopes on the ground has two major challenges. First, the brightness is significantly reduced at long submillimeter wavelengths compared to the bright- ness at the peak of the dust emission. Second, it is necessary to use a high-pass spatial filter to remove atmospheric noise on large angular scales, which has the unwelcome by-product of also removing the galaxy’s large-scale structure. We have developed a technique for producing high-resolution submillimeter images of galaxies of large angular size by using the telescope on the ground to determine the small-scale structure (the large Fourier components) and a space telescope (Herschel or Planck) to determine the large-scale structure (the small Fourier components). Using this technique, we are carrying out the HARP and SCUBA-2 High Resolution Terahertz Andromeda Galaxy Survey (HASHTAG), an international Large Program on the James Clerk Maxwell Telescope, with one aim being to produce the first high-fidelity high-resolution submillimeter images of Andromeda. In this paper, we describe the survey, the method we have developed for combining the space-based and ground-based data, and present the first HASHTAG images of Andromeda at 450 and 850 μm. We also have created a method to predict the CO(J=3–2) line flux across M31, which contaminates the 850μm band. We find that while normally the contamination is below our sensitivity limit, the contamination can be significant (up to 28%) in a few of the brightest regions of the 10 kpc ring. We therefore also provide images with the predicted line emission removed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Date of First Compliant Deposit: 16 December 2021
Date of Acceptance: 3 September 2021
Last Modified: 14 Dec 2023 17:45

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