FAUST XIX. D$_2$CO in the outflow cavities of NGC\,1333 IRAS\,4A: recovering the physical structure of its original prestellar core
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2024
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| author | Chahine, Layal Ceccarelli, Cecilia De Simone, Marta Chandler, Claire J. Codella, Claudio Podio, Linda López-Sepulcre, Ana Svoboda, Brian Sabatini, Giovanni Sakai, Nami Loinard, Laurent Vastel, Charlotte Balucani, Nadia Rimola, Albert Ugliengo, Piero Aikawa, Yuri Bianchi, Eleonora Bouvier, Mathilde Caselli, Paola Charnley, Steven Cuello, Nicolás Hanawa, Tomoyuki Johnstone, Doug Maureira, Maria José Ménard, Francois Shirley, Yancy Testi, Leonardo Yamamoto, Satoshi |
| author_facet | Chahine, Layal Ceccarelli, Cecilia De Simone, Marta Chandler, Claire J. Codella, Claudio Podio, Linda López-Sepulcre, Ana Svoboda, Brian Sabatini, Giovanni Sakai, Nami Loinard, Laurent Vastel, Charlotte Balucani, Nadia Rimola, Albert Ugliengo, Piero Aikawa, Yuri Bianchi, Eleonora Bouvier, Mathilde Caselli, Paola Charnley, Steven Cuello, Nicolás Hanawa, Tomoyuki Johnstone, Doug Maureira, Maria José Ménard, Francois Shirley, Yancy Testi, Leonardo Yamamoto, Satoshi |
| contents | Molecular deuteration is a powerful diagnostic tool for probing the physical conditions and chemical processes in astrophysical environments. In this work, we focus on formaldehyde deuteration in the protobinary system NGC\,1333 IRAS\,4A, located in the Perseus molecular cloud. Using high-resolution ($\sim$\,100\,au) ALMA observations, we investigate the [D$_2$CO]/[HDCO] ratio along the cavity walls of the outflows emanating from IRAS\,4A1. Our analysis reveals a consistent decrease in the deuteration ratio (from $\sim$\,60-20\% to $\sim$\,10\%) with increasing distance from the protostar (from $\sim$\,2000\,au to $\sim$\,4000\,au). Given the large measured [D$_2$CO]/[HDCO], both HDCO and D$_2$CO are likely injected by the shocks along the cavity walls into the gas-phase from the dust mantles, formed in the previous prestellar phase. We propose that the observed [D$_2$CO]/[HDCO] decrease is due to the density profile of the prestellar core from which NGC\,1333 IRAS\,4A was born. When considering the chemical processes at the base of formaldehyde deuteration, the IRAS\,4A's prestellar precursor had a predominantly flat density profile within 3000\,au and a decrease of density beyond this radius. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15517 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | FAUST XIX. D$_2$CO in the outflow cavities of NGC\,1333 IRAS\,4A: recovering the physical structure of its original prestellar core Chahine, Layal Ceccarelli, Cecilia De Simone, Marta Chandler, Claire J. Codella, Claudio Podio, Linda López-Sepulcre, Ana Svoboda, Brian Sabatini, Giovanni Sakai, Nami Loinard, Laurent Vastel, Charlotte Balucani, Nadia Rimola, Albert Ugliengo, Piero Aikawa, Yuri Bianchi, Eleonora Bouvier, Mathilde Caselli, Paola Charnley, Steven Cuello, Nicolás Hanawa, Tomoyuki Johnstone, Doug Maureira, Maria José Ménard, Francois Shirley, Yancy Testi, Leonardo Yamamoto, Satoshi Astrophysics of Galaxies Molecular deuteration is a powerful diagnostic tool for probing the physical conditions and chemical processes in astrophysical environments. In this work, we focus on formaldehyde deuteration in the protobinary system NGC\,1333 IRAS\,4A, located in the Perseus molecular cloud. Using high-resolution ($\sim$\,100\,au) ALMA observations, we investigate the [D$_2$CO]/[HDCO] ratio along the cavity walls of the outflows emanating from IRAS\,4A1. Our analysis reveals a consistent decrease in the deuteration ratio (from $\sim$\,60-20\% to $\sim$\,10\%) with increasing distance from the protostar (from $\sim$\,2000\,au to $\sim$\,4000\,au). Given the large measured [D$_2$CO]/[HDCO], both HDCO and D$_2$CO are likely injected by the shocks along the cavity walls into the gas-phase from the dust mantles, formed in the previous prestellar phase. We propose that the observed [D$_2$CO]/[HDCO] decrease is due to the density profile of the prestellar core from which NGC\,1333 IRAS\,4A was born. When considering the chemical processes at the base of formaldehyde deuteration, the IRAS\,4A's prestellar precursor had a predominantly flat density profile within 3000\,au and a decrease of density beyond this radius. |
| title | FAUST XIX. D$_2$CO in the outflow cavities of NGC\,1333 IRAS\,4A: recovering the physical structure of its original prestellar core |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.15517 |