Astronomical Detection of the Interstellar Anion C10H− toward TMC-1 from the GOTHAM Large Program on the Green Bank Telescope
Using data from the Green Bank Telescope (GBT) Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM) survey, we report the first astronomical detection of the C10H− anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C10H−. From th...
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| Veröffentlicht in: | Astrophysical journal. Letters 2023-02, Vol.944 (2), p.L45 |
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| creator | Remijan, Anthony Scolati, Haley N. Burkhardt, Andrew M. Changala, P. Bryan Charnley, Steven B. Cooke, Ilsa R. Cordiner, Martin A. Gupta, Harshal Herbst, Eric Kelvin Lee, Kin Long Loomis, Ryan A. Shingledecker, Christopher N. Siebert, Mark A. Xue, Ci McCarthy, Michael C. McGuire, Brett A. |
| description | Using data from the Green Bank Telescope (GBT) Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM) survey, we report the first astronomical detection of the C10H− anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C10H−. From the velocity stacked data and the matched filter response, C10H− is detected at >9σ confidence level at a column density of 4.04−2.23+10.67×1011 cm−2. A dedicated search for the C10H radical was also conducted toward TMC-1. In this case, the stacked molecular emission of C10H was detected at a ∼3.2σ confidence interval at a column density of 2.02−0.82+2.68×1011 cm−2. However, as the determined confidence level is currently |
| doi_str_mv | 10.3847/2041-8213/acb648 |
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Bryan ; Charnley, Steven B. ; Cooke, Ilsa R. ; Cordiner, Martin A. ; Gupta, Harshal ; Herbst, Eric ; Kelvin Lee, Kin Long ; Loomis, Ryan A. ; Shingledecker, Christopher N. ; Siebert, Mark A. ; Xue, Ci ; McCarthy, Michael C. ; McGuire, Brett A.</creator><creatorcontrib>Remijan, Anthony ; Scolati, Haley N. ; Burkhardt, Andrew M. ; Changala, P. Bryan ; Charnley, Steven B. ; Cooke, Ilsa R. ; Cordiner, Martin A. ; Gupta, Harshal ; Herbst, Eric ; Kelvin Lee, Kin Long ; Loomis, Ryan A. ; Shingledecker, Christopher N. ; Siebert, Mark A. ; Xue, Ci ; McCarthy, Michael C. ; McGuire, Brett A.</creatorcontrib><description>Using data from the Green Bank Telescope (GBT) Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM) survey, we report the first astronomical detection of the C10H− anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C10H−. From the velocity stacked data and the matched filter response, C10H− is detected at >9σ confidence level at a column density of 4.04−2.23+10.67×1011 cm−2. A dedicated search for the C10H radical was also conducted toward TMC-1. In this case, the stacked molecular emission of C10H was detected at a ∼3.2σ confidence interval at a column density of 2.02−0.82+2.68×1011 cm−2. However, as the determined confidence level is currently <5σ, we consider the identification of C10H as tentative. The full GOTHAM data set was also used to better characterize the physical parameters including column density, excitation temperature, line width, and source size for the C4H, C6H, and C8H radicals and their respective anions, and the measured column densities were compared to the predictions from a gas/grain chemical formation model and from a machine learning analysis. Given the measured values, the C10H−/C10H column density ratio is ∼2.0−1.6+5.9—the highest value measured between an anion and neutral species to date. Such a high ratio is at odds with current theories for interstellar anion chemistry. For the radical species, both models can reproduce the measured abundances found from the survey; however, the machine learning analysis matches the detected anion abundances much better than the gas/grain chemical model, suggesting that the current understanding of the formation chemistry of molecular anions is still highly uncertain.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.3847/2041-8213/acb648</identifier><language>eng</language><publisher>Austin: The American Astronomical Society</publisher><subject>Abundance ; Anions ; Astrochemistry ; Confidence intervals ; Dark interstellar clouds ; Density ratio ; Hunting ; Interstellar chemistry ; Machine learning ; Matched filters ; Parameters ; Physical properties ; Radicals ; Statistical analysis</subject><ispartof>Astrophysical journal. Letters, 2023-02, Vol.944 (2), p.L45</ispartof><rights>2023. The Author(s). Published by the American Astronomical Society.</rights><rights>2023. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0001-6752-5109 ; 0000-0001-9479-9287 ; 0000-0003-2588-516X ; 0000-0001-8233-2436 ; 0000-0002-0850-7426 ; 0000-0002-4649-2536 ; 0000-0002-1903-9242 ; 0000-0003-2760-2119 ; 0000-0002-8505-4459 ; 0000-0003-1254-4817 ; 0000-0002-8505-4934 ; 0000-0003-0799-0927 ; 0000-0001-9142-0008 ; 0000-0002-5171-7568 ; 0000-0002-8932-1219</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8213/acb648/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,776,780,860,2096,27901,27902,38845,38867,53815,53842</link.rule.ids></links><search><creatorcontrib>Remijan, Anthony</creatorcontrib><creatorcontrib>Scolati, Haley N.</creatorcontrib><creatorcontrib>Burkhardt, Andrew M.</creatorcontrib><creatorcontrib>Changala, P. Bryan</creatorcontrib><creatorcontrib>Charnley, Steven B.</creatorcontrib><creatorcontrib>Cooke, Ilsa R.</creatorcontrib><creatorcontrib>Cordiner, Martin A.</creatorcontrib><creatorcontrib>Gupta, Harshal</creatorcontrib><creatorcontrib>Herbst, Eric</creatorcontrib><creatorcontrib>Kelvin Lee, Kin Long</creatorcontrib><creatorcontrib>Loomis, Ryan A.</creatorcontrib><creatorcontrib>Shingledecker, Christopher N.</creatorcontrib><creatorcontrib>Siebert, Mark A.</creatorcontrib><creatorcontrib>Xue, Ci</creatorcontrib><creatorcontrib>McCarthy, Michael C.</creatorcontrib><creatorcontrib>McGuire, Brett A.</creatorcontrib><title>Astronomical Detection of the Interstellar Anion C10H− toward TMC-1 from the GOTHAM Large Program on the Green Bank Telescope</title><title>Astrophysical journal. Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>Using data from the Green Bank Telescope (GBT) Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM) survey, we report the first astronomical detection of the C10H− anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C10H−. From the velocity stacked data and the matched filter response, C10H− is detected at >9σ confidence level at a column density of 4.04−2.23+10.67×1011 cm−2. A dedicated search for the C10H radical was also conducted toward TMC-1. In this case, the stacked molecular emission of C10H was detected at a ∼3.2σ confidence interval at a column density of 2.02−0.82+2.68×1011 cm−2. However, as the determined confidence level is currently <5σ, we consider the identification of C10H as tentative. The full GOTHAM data set was also used to better characterize the physical parameters including column density, excitation temperature, line width, and source size for the C4H, C6H, and C8H radicals and their respective anions, and the measured column densities were compared to the predictions from a gas/grain chemical formation model and from a machine learning analysis. Given the measured values, the C10H−/C10H column density ratio is ∼2.0−1.6+5.9—the highest value measured between an anion and neutral species to date. Such a high ratio is at odds with current theories for interstellar anion chemistry. 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Bryan ; Charnley, Steven B. ; Cooke, Ilsa R. ; Cordiner, Martin A. ; Gupta, Harshal ; Herbst, Eric ; Kelvin Lee, Kin Long ; Loomis, Ryan A. ; Shingledecker, Christopher N. ; Siebert, Mark A. ; Xue, Ci ; McCarthy, Michael C. ; McGuire, Brett A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-d359t-62f715acc83de25d9c92b0187edc5e68e95b3a753f2176d4795d1750ea58ba2e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Abundance</topic><topic>Anions</topic><topic>Astrochemistry</topic><topic>Confidence intervals</topic><topic>Dark interstellar clouds</topic><topic>Density ratio</topic><topic>Hunting</topic><topic>Interstellar chemistry</topic><topic>Machine learning</topic><topic>Matched filters</topic><topic>Parameters</topic><topic>Physical properties</topic><topic>Radicals</topic><topic>Statistical analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Remijan, Anthony</creatorcontrib><creatorcontrib>Scolati, Haley N.</creatorcontrib><creatorcontrib>Burkhardt, Andrew M.</creatorcontrib><creatorcontrib>Changala, P. 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Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Remijan, Anthony</au><au>Scolati, Haley N.</au><au>Burkhardt, Andrew M.</au><au>Changala, P. Bryan</au><au>Charnley, Steven B.</au><au>Cooke, Ilsa R.</au><au>Cordiner, Martin A.</au><au>Gupta, Harshal</au><au>Herbst, Eric</au><au>Kelvin Lee, Kin Long</au><au>Loomis, Ryan A.</au><au>Shingledecker, Christopher N.</au><au>Siebert, Mark A.</au><au>Xue, Ci</au><au>McCarthy, Michael C.</au><au>McGuire, Brett A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Astronomical Detection of the Interstellar Anion C10H− toward TMC-1 from the GOTHAM Large Program on the Green Bank Telescope</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2023-02-01</date><risdate>2023</risdate><volume>944</volume><issue>2</issue><spage>L45</spage><pages>L45-</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>Using data from the Green Bank Telescope (GBT) Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM) survey, we report the first astronomical detection of the C10H− anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C10H−. From the velocity stacked data and the matched filter response, C10H− is detected at >9σ confidence level at a column density of 4.04−2.23+10.67×1011 cm−2. A dedicated search for the C10H radical was also conducted toward TMC-1. In this case, the stacked molecular emission of C10H was detected at a ∼3.2σ confidence interval at a column density of 2.02−0.82+2.68×1011 cm−2. However, as the determined confidence level is currently <5σ, we consider the identification of C10H as tentative. The full GOTHAM data set was also used to better characterize the physical parameters including column density, excitation temperature, line width, and source size for the C4H, C6H, and C8H radicals and their respective anions, and the measured column densities were compared to the predictions from a gas/grain chemical formation model and from a machine learning analysis. Given the measured values, the C10H−/C10H column density ratio is ∼2.0−1.6+5.9—the highest value measured between an anion and neutral species to date. Such a high ratio is at odds with current theories for interstellar anion chemistry. For the radical species, both models can reproduce the measured abundances found from the survey; however, the machine learning analysis matches the detected anion abundances much better than the gas/grain chemical model, suggesting that the current understanding of the formation chemistry of molecular anions is still highly uncertain.</abstract><cop>Austin</cop><pub>The American Astronomical Society</pub><doi>10.3847/2041-8213/acb648</doi><tpages>28</tpages><orcidid>https://orcid.org/0000-0001-6752-5109</orcidid><orcidid>https://orcid.org/0000-0001-9479-9287</orcidid><orcidid>https://orcid.org/0000-0003-2588-516X</orcidid><orcidid>https://orcid.org/0000-0001-8233-2436</orcidid><orcidid>https://orcid.org/0000-0002-0850-7426</orcidid><orcidid>https://orcid.org/0000-0002-4649-2536</orcidid><orcidid>https://orcid.org/0000-0002-1903-9242</orcidid><orcidid>https://orcid.org/0000-0003-2760-2119</orcidid><orcidid>https://orcid.org/0000-0002-8505-4459</orcidid><orcidid>https://orcid.org/0000-0003-1254-4817</orcidid><orcidid>https://orcid.org/0000-0002-8505-4934</orcidid><orcidid>https://orcid.org/0000-0003-0799-0927</orcidid><orcidid>https://orcid.org/0000-0001-9142-0008</orcidid><orcidid>https://orcid.org/0000-0002-5171-7568</orcidid><orcidid>https://orcid.org/0000-0002-8932-1219</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Abundance Anions Astrochemistry Confidence intervals Dark interstellar clouds Density ratio Hunting Interstellar chemistry Machine learning Matched filters Parameters Physical properties Radicals Statistical analysis |
| title | Astronomical Detection of the Interstellar Anion C10H− toward TMC-1 from the GOTHAM Large Program on the Green Bank Telescope |
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