The Green Bank Ammonia Survey: Data Release 2
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| Format: | Preprint |
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2025
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| author | Pineda, Jaime E. Friesen, Rachel K. Rosolowsky, Erik Chacón-Tanarro, Ana Chen, Michael Chun-Yuan Di Francesco, James Kirk, Helen Punanova, Anna Seo, Youngmin Shirley, Yancy Ginsburg, Adam Offner, Stella S. R. Pandhi, Ayush Singh, Ayushi Quan, Feiyu Arce, Héctor G. Caselli, Paola Choudhury, Spandan Goodman, Alyssa A. Heitsch, Fabian Martin, Peter G. Matzner, Christopher D. Myers, Philip C. Redaelli, Elena Scibelli, Samantha |
| author_facet | Pineda, Jaime E. Friesen, Rachel K. Rosolowsky, Erik Chacón-Tanarro, Ana Chen, Michael Chun-Yuan Di Francesco, James Kirk, Helen Punanova, Anna Seo, Youngmin Shirley, Yancy Ginsburg, Adam Offner, Stella S. R. Pandhi, Ayush Singh, Ayushi Quan, Feiyu Arce, Héctor G. Caselli, Paola Choudhury, Spandan Goodman, Alyssa A. Heitsch, Fabian Martin, Peter G. Matzner, Christopher D. Myers, Philip C. Redaelli, Elena Scibelli, Samantha |
| contents | We present an overview of the final data release (DR2) 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 $A_\mathrm{V} \gtrsim 7$~mag visible from the northern hemisphere in emission from NH$_3$ and other key molecular tracers. This final release includes the data for all the regions observed: Heiles Cloud 2 and B18 in Taurus; Barnard 1, Barnard 1-E, IC348, NGC 1333, L1448, L1451, and Per7/34 in Perseus; L1688 and L1689 in Ophiuchus; Orion A (North and South) and Orion B in Orion; Cepheus, B59 in Pipe; Corona Australis (CrA) East and West; IC5146; and Serpens Aquila and MWC297 in Serpens. Similar to what was presented in GAS DR1, we find that the NH$_3$ emission and dust continuum emission from Herschel correspond closely. We find that the NH$_3$ emission is generally extended beyond the typical 0.1 pc length scales of dense cores, and we find that the transition between coherent core and turbulent cloud is a common result. This shows that the regions of coherence are common throughout different star forming regions, with a substantial fraction of the high column density regions displaying subsonic non-thermal velocity dispersions. 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, $σ_v$, and gas kinetic temperature, $T_{\rm kin}$, vary systematically between the regions included in this release, with an increase in both the mean value and spread of $σ_v$ and $T_{\rm kin}$ with increasing star formation activity. The data presented in this paper are publicly available via \dataset[DOI: 10.11570/24.0091]{https://doi.org/10.11570/24.0091}. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_10607 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Green Bank Ammonia Survey: Data Release 2 Pineda, Jaime E. Friesen, Rachel K. Rosolowsky, Erik Chacón-Tanarro, Ana Chen, Michael Chun-Yuan Di Francesco, James Kirk, Helen Punanova, Anna Seo, Youngmin Shirley, Yancy Ginsburg, Adam Offner, Stella S. R. Pandhi, Ayush Singh, Ayushi Quan, Feiyu Arce, Héctor G. Caselli, Paola Choudhury, Spandan Goodman, Alyssa A. Heitsch, Fabian Martin, Peter G. Matzner, Christopher D. Myers, Philip C. Redaelli, Elena Scibelli, Samantha Astrophysics of Galaxies Solar and Stellar Astrophysics We present an overview of the final data release (DR2) 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 $A_\mathrm{V} \gtrsim 7$~mag visible from the northern hemisphere in emission from NH$_3$ and other key molecular tracers. This final release includes the data for all the regions observed: Heiles Cloud 2 and B18 in Taurus; Barnard 1, Barnard 1-E, IC348, NGC 1333, L1448, L1451, and Per7/34 in Perseus; L1688 and L1689 in Ophiuchus; Orion A (North and South) and Orion B in Orion; Cepheus, B59 in Pipe; Corona Australis (CrA) East and West; IC5146; and Serpens Aquila and MWC297 in Serpens. Similar to what was presented in GAS DR1, we find that the NH$_3$ emission and dust continuum emission from Herschel correspond closely. We find that the NH$_3$ emission is generally extended beyond the typical 0.1 pc length scales of dense cores, and we find that the transition between coherent core and turbulent cloud is a common result. This shows that the regions of coherence are common throughout different star forming regions, with a substantial fraction of the high column density regions displaying subsonic non-thermal velocity dispersions. 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, $σ_v$, and gas kinetic temperature, $T_{\rm kin}$, vary systematically between the regions included in this release, with an increase in both the mean value and spread of $σ_v$ and $T_{\rm kin}$ with increasing star formation activity. The data presented in this paper are publicly available via \dataset[DOI: 10.11570/24.0091]{https://doi.org/10.11570/24.0091}. |
| title | The Green Bank Ammonia Survey: Data Release 2 |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.10607 |