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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The HASHTAG project I. A survey of CO(3-2) emission from the star forming disc of M31
Monthly Notices of the Royal Astronomical Society, Volume 492, No. 1, Year 2020
Notification
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Description
We present a CO(3-2) survey of selected regions in the M31 disc as part of the JCMT large programme, HARP and SCUBA-2 High-Resolution Terahertz Andromeda Galaxy Survey (HASHTAG). The 12 CO(3-2) fields in this survey cover a total area of 60 arcmin2, spanning a deprojected radial range of 2-14 kpc across the M31 disc. Combining these observations with existing IRAM 30m CO(1-0) observations and JCMT CO(3-2) maps of the nuclear region of M31, as well as dust temperature and star formation rate surface density maps, we are able to explore the radial distribution of the CO(3-2)/CO(1-0) integrated intensity ratio (R31) and its relationship with dust temperature and star formation. We find that the value of R31 between 2 and 9 kpc galactocentric radius is 0.14, significantly lower than what is seen in the nuclear ring at 1 kpc (R31 ~ 0.8), only to rise again to 0.27 for the fields centred on the 10 kpc star forming ring.We also found that R31 is positively correlated with dust temperature, with Spearman's rank correlation coefficient ρ = 0.55. The correlation between star formation rate surface density and CO(3-2) intensity is much stronger than with CO(1-0), with ρ =0.54 compared to -0.05, suggesting that the CO(3-2) line traces warmer and denser star forming gas better. We also find that R31 correlates well with star formation rate surface density, with ρ = 0.69. © 2019 The Author(s).
Authors & Co-Authors
Li, Zhiyuan
China, Nanjing
Nanjing University
Smith, Matthew W.L.
United Kingdom, Cardiff
Cardiff University
Wilson, Christine D.
Canada, Hamilton
Mcmaster University
Gao, Yu
China, Beijing
Chinese Academy of Sciences
Eales, Stephen A.
United Kingdom, Cardiff
Cardiff University
Ao, Yiping
China, Beijing
Chinese Academy of Sciences
Bureau, Martin
United Kingdom, Oxford
University of Oxford
South Korea, Seoul
Yonsei University
Chung, Aeree
South Korea, Seoul
Yonsei University
Davis, Timothy A.
United Kingdom, Cardiff
Cardiff University
de Grijs, Richard
Australia, Sydney
Macquarie University
Eden, David J.
United Kingdom, Liverpool
Liverpool John Moores University
He, Jinhua
China, Beijing
Chinese Academy of Sciences
Chile, Santiago
Universidad de Chile
Hughes, Thomas M.
China, Beijing
Chinese Academy of Sciences
Chile, Valparaiso
Universidad de Valparaiso
China, Hefei
University of Science and Technology of China
Kemper, F.
Germany, Garching Bei Munchen
European Southern Observatory
Taiwan, Nankang
Academia Sinica Taiwan
Lamperti, Isabella
United Kingdom, London
University College London
Lee, Bumhyun
South Korea, Seoul
Yonsei University
Lee, Chienhsiu Hsiu
United States, Tucson
National Optical Astronomy Observatory
Michałowski, Michał J.
Poland, Poznan
Uniwersytet Im. Adama Mickiewicza w Poznaniu
Parsons, Harriet A.L.
United States, Hilo
East Asian Observatory
Tang, Xindi
China, Beijing
Chinese Academy of Sciences
Tomičić, Neven
Germany, Heidelberg
Max Planck Institute for Astronomy
Viaene, Sébastien
United Kingdom, Hatfield
University of Hertfordshire
Belgium, Ghent
Universiteit Gent
Williams, Thomas G.
United Kingdom, Cardiff
Cardiff University
Zhu, Ming
China, Beijing
National Astronomical Observatories Chinese Academy of Sciences
Statistics
Citations: 3
Authors: 24
Affiliations: 21
Identifiers
Doi:
10.1093/mnras/stz3409
ISSN:
00358711
Research Areas
Cancer
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative