{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-green-bank-ammonia-survey-gas-first","title":"The Green Bank Ammonia Survey (GAS): First Results of NH3 mapping the Gould Belt","arxiv_id":"1704.06318","date":"2017-04-20","proceeding":null,"authors":["Rachel K. Friesen","Jaime E. Pineda","Erik Rosolowsky","Felipe Alves","Ana Chacón-Tanarro","Hope How-Huan Chen","Michael Chun-Yuan Chen","James Di Francesco","Jared Keown","Helen Kirk","Anna Punanova","Youngmin Seo","Yancy Shirley","Adam Ginsburg","Christine Hall","Stella S. R. Offner","Ayushi Singh","Héctor G. Arce","Paola Caselli","Alyssa A. Goodman","Peter G. Martin","Christopher Matzner","Philip C. Myers","Elena Redaelli"],"abstract":"We present an overview of the first data release (DR1) and first-look science from the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the Green Bank Telescope to map all Gould Belt star-forming regions with $A_V \\gtrsim 7$ mag visible from the northern hemisphere in emission from NH$_3$ and other key molecular tracers. This first release includes the data for four regions in Gould Belt clouds: B18 in Taurus, NGC 1333 in Perseus, L1688 in Ophiuchus, and Orion A North in Orion. We compare the NH$_3$ emission to dust continuum emission from Herschel, and find that the two tracers correspond closely. NH$_3$ is present in over 60\\% of lines-of-sight with $A_V \\gtrsim 7$ mag in three of the four DR1 regions, in agreement with expectations from previous observations. The sole exception is B18, where NH$_3$ is detected toward ~ 40\\% of lines-of-sight with $A_V \\gtrsim 7$ mag. Moreover, we find that the NH$_3$ emission is generally extended beyond the typical 0.1 pc length scales of dense cores. We produce maps of the gas kinematics, temperature, and NH$_3$ column densities through forward modeling of the hyperfine structure of the NH$_3$ (1,1) and (2,2) lines. We show that the NH$_3$ velocity dispersion, ${\\sigma}_v$, and gas kinetic temperature, $T_K$, vary systematically between the regions included in this release, with an increase in both the mean value and spread of ${\\sigma}_v$ and $T_K$ with increasing star formation activity. The data presented in this paper are publicly available.","url_abs":"https://arxiv.org/abs/1704.06318v1","url_pdf":"https://arxiv.org/pdf/1704.06318v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-green-bank-ammonia-survey-gas-first","repo_url":"https://github.com/vlas-sokolov/bayesian-ngc1333","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}