Assessment of the Presence of PAHs and Hydrogenated PAHs in the Young Stellar Object Mon R2 and the Taurus Dense Cloud Toward Elias 16
This study assesses the contribution of neutral polycyclic aromatic hydrocarbons (PAHs) and hydrogenated PAHs (H n -PAHs) in H 2 O-ices to the 3 μ m and 5–8 μ m regions of the infrared absorption spectrum of the Young Stellar Object, Mon R2 IRS 3, and the Taurus dense cloud in the direction of Elias...
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| Veröffentlicht in: | The Astrophysical journal 2021-02, Vol.908 (2), p.239 |
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| creator | Chiar, J. E. de Barros, A. L. F. Mattioda, A. L. Ricca, A. |
| description | This study assesses the contribution of neutral polycyclic aromatic hydrocarbons (PAHs) and hydrogenated PAHs (H
n
-PAHs) in H
2
O-ices to the 3
μ
m and 5–8
μ
m regions of the infrared absorption spectrum of the Young Stellar Object, Mon R2 IRS 3, and the Taurus dense cloud in the direction of Elias 16. We compare the astronomical spectra to the previously published laboratory data of matrix-isolated PAHs and H
n
-PAHs in H
2
O-ices. For the molecules in this study, the band positions, FWHMs, and integrated band strengths have been measured. For the PAHs considered here, the ratio of the experimental
A
(C–H) stretch (in H
2
O ices) to the theoretical
A
(C–H) stretch (in the gas phase) is consistently about 0.10, meaning that the trove of theoretical data can be reliably scaled to compare to the astronomical spectra. We find that the fractional percentage contribution to the 5–8
μ
m region for Mon R2 IRS 3 ranges between 2.7 and 3.9 for neutral PAHs and 0.25–1.2 for H
n
-PAHs. The best match to the observed 3.25
μ
m profile in the Mon R2 IRS 3 spectrum is accomplished with the laboratory-measured coronene:H
2
O spectrum. Using this spectrum we estimate that neutral PAHs contribute up to 12.0% of the cosmic carbon budget for Mon R2 IRS 3 and |
| doi_str_mv | 10.3847/1538-4357/abd6e8 |
| format | Article |
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n
-PAHs) in H
2
O-ices to the 3
μ
m and 5–8
μ
m regions of the infrared absorption spectrum of the Young Stellar Object, Mon R2 IRS 3, and the Taurus dense cloud in the direction of Elias 16. We compare the astronomical spectra to the previously published laboratory data of matrix-isolated PAHs and H
n
-PAHs in H
2
O-ices. For the molecules in this study, the band positions, FWHMs, and integrated band strengths have been measured. For the PAHs considered here, the ratio of the experimental
A
(C–H) stretch (in H
2
O ices) to the theoretical
A
(C–H) stretch (in the gas phase) is consistently about 0.10, meaning that the trove of theoretical data can be reliably scaled to compare to the astronomical spectra. We find that the fractional percentage contribution to the 5–8
μ
m region for Mon R2 IRS 3 ranges between 2.7 and 3.9 for neutral PAHs and 0.25–1.2 for H
n
-PAHs. The best match to the observed 3.25
μ
m profile in the Mon R2 IRS 3 spectrum is accomplished with the laboratory-measured coronene:H
2
O spectrum. Using this spectrum we estimate that neutral PAHs contribute up to 12.0% of the cosmic carbon budget for Mon R2 IRS 3 and <14.5% for Elias 16. Neutral hydrogenated PAHs contribute mainly to the 3.47
μ
m absorption and very little to the 5 to 8
μ
m region. For neutral H
n
-PAHs, we estimate that they contribute up to 0.6% of the cosmic carbon budget for Mon R2 IRS 3 and <1% for Elias 16.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/abd6e8</identifier><language>eng</language><publisher>Philadelphia: IOP Publishing</publisher><subject>Absorption ; Absorption spectra ; Astrophysics ; Carbon ; Carbon budget ; Celestial bodies ; Hydrogenation ; Infrared absorption ; Laboratories ; Polycyclic aromatic hydrocarbons ; Vapor phases</subject><ispartof>The Astrophysical journal, 2021-02, Vol.908 (2), p.239</ispartof><rights>Copyright IOP Publishing Feb 01, 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c313t-8a9b20b3b7ec55991df9f9083b3350bb75bae3405fef0f2cce709c37a1a2220a3</citedby><cites>FETCH-LOGICAL-c313t-8a9b20b3b7ec55991df9f9083b3350bb75bae3405fef0f2cce709c37a1a2220a3</cites><orcidid>0000-0002-3141-0630 ; 0000-0003-1153-7850 ; 0000-0001-7023-8282 ; 0000-0003-2029-1549</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Chiar, J. E.</creatorcontrib><creatorcontrib>de Barros, A. L. F.</creatorcontrib><creatorcontrib>Mattioda, A. L.</creatorcontrib><creatorcontrib>Ricca, A.</creatorcontrib><title>Assessment of the Presence of PAHs and Hydrogenated PAHs in the Young Stellar Object Mon R2 and the Taurus Dense Cloud Toward Elias 16</title><title>The Astrophysical journal</title><description>This study assesses the contribution of neutral polycyclic aromatic hydrocarbons (PAHs) and hydrogenated PAHs (H
n
-PAHs) in H
2
O-ices to the 3
μ
m and 5–8
μ
m regions of the infrared absorption spectrum of the Young Stellar Object, Mon R2 IRS 3, and the Taurus dense cloud in the direction of Elias 16. We compare the astronomical spectra to the previously published laboratory data of matrix-isolated PAHs and H
n
-PAHs in H
2
O-ices. For the molecules in this study, the band positions, FWHMs, and integrated band strengths have been measured. For the PAHs considered here, the ratio of the experimental
A
(C–H) stretch (in H
2
O ices) to the theoretical
A
(C–H) stretch (in the gas phase) is consistently about 0.10, meaning that the trove of theoretical data can be reliably scaled to compare to the astronomical spectra. We find that the fractional percentage contribution to the 5–8
μ
m region for Mon R2 IRS 3 ranges between 2.7 and 3.9 for neutral PAHs and 0.25–1.2 for H
n
-PAHs. The best match to the observed 3.25
μ
m profile in the Mon R2 IRS 3 spectrum is accomplished with the laboratory-measured coronene:H
2
O spectrum. Using this spectrum we estimate that neutral PAHs contribute up to 12.0% of the cosmic carbon budget for Mon R2 IRS 3 and <14.5% for Elias 16. Neutral hydrogenated PAHs contribute mainly to the 3.47
μ
m absorption and very little to the 5 to 8
μ
m region. For neutral H
n
-PAHs, we estimate that they contribute up to 0.6% of the cosmic carbon budget for Mon R2 IRS 3 and <1% for Elias 16.</description><subject>Absorption</subject><subject>Absorption spectra</subject><subject>Astrophysics</subject><subject>Carbon</subject><subject>Carbon budget</subject><subject>Celestial bodies</subject><subject>Hydrogenation</subject><subject>Infrared absorption</subject><subject>Laboratories</subject><subject>Polycyclic aromatic hydrocarbons</subject><subject>Vapor phases</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNo9kF1LwzAUhoMoOKf3Xga8rstH2zSXY04nTDZ0gl6VJD2ZG10ykxbZH_B3u1rx6vC-POcceBC6puSWF6kY0YwXScozMVK6yqE4QYP_6hQNCCFpknPxdo4uYtx2kUk5QN_jGCHGHbgGe4ubD8DLABGcgS4vx7OIlavw7FAFvwanGqj6duN-6XffujV-aaCuVcALvQXT4Cfv8DP7XeyYlWpDG_EduAh4Uvu2wiv_pUKFp_VGRUzzS3RmVR3h6m8O0ev9dDWZJfPFw-NkPE8Mp7xJCiU1I5prASbLpKSVlVaSgmvOM6K1yLQCnpLMgiWWGQOCSMOFoooxRhQfopv-7j74zxZiU259G9zxZclSmUpB87w4UqSnTPAxBrDlPmx2KhxKSsrOdtmpLTu1ZW-b_wCyh3KB</recordid><startdate>20210201</startdate><enddate>20210201</enddate><creator>Chiar, J. E.</creator><creator>de Barros, A. L. F.</creator><creator>Mattioda, A. L.</creator><creator>Ricca, A.</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-3141-0630</orcidid><orcidid>https://orcid.org/0000-0003-1153-7850</orcidid><orcidid>https://orcid.org/0000-0001-7023-8282</orcidid><orcidid>https://orcid.org/0000-0003-2029-1549</orcidid></search><sort><creationdate>20210201</creationdate><title>Assessment of the Presence of PAHs and Hydrogenated PAHs in the Young Stellar Object Mon R2 and the Taurus Dense Cloud Toward Elias 16</title><author>Chiar, J. E. ; de Barros, A. L. F. ; Mattioda, A. L. ; Ricca, A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c313t-8a9b20b3b7ec55991df9f9083b3350bb75bae3405fef0f2cce709c37a1a2220a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Absorption</topic><topic>Absorption spectra</topic><topic>Astrophysics</topic><topic>Carbon</topic><topic>Carbon budget</topic><topic>Celestial bodies</topic><topic>Hydrogenation</topic><topic>Infrared absorption</topic><topic>Laboratories</topic><topic>Polycyclic aromatic hydrocarbons</topic><topic>Vapor phases</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chiar, J. E.</creatorcontrib><creatorcontrib>de Barros, A. L. F.</creatorcontrib><creatorcontrib>Mattioda, A. L.</creatorcontrib><creatorcontrib>Ricca, A.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chiar, J. E.</au><au>de Barros, A. L. F.</au><au>Mattioda, A. L.</au><au>Ricca, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Assessment of the Presence of PAHs and Hydrogenated PAHs in the Young Stellar Object Mon R2 and the Taurus Dense Cloud Toward Elias 16</atitle><jtitle>The Astrophysical journal</jtitle><date>2021-02-01</date><risdate>2021</risdate><volume>908</volume><issue>2</issue><spage>239</spage><pages>239-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>This study assesses the contribution of neutral polycyclic aromatic hydrocarbons (PAHs) and hydrogenated PAHs (H
n
-PAHs) in H
2
O-ices to the 3
μ
m and 5–8
μ
m regions of the infrared absorption spectrum of the Young Stellar Object, Mon R2 IRS 3, and the Taurus dense cloud in the direction of Elias 16. We compare the astronomical spectra to the previously published laboratory data of matrix-isolated PAHs and H
n
-PAHs in H
2
O-ices. For the molecules in this study, the band positions, FWHMs, and integrated band strengths have been measured. For the PAHs considered here, the ratio of the experimental
A
(C–H) stretch (in H
2
O ices) to the theoretical
A
(C–H) stretch (in the gas phase) is consistently about 0.10, meaning that the trove of theoretical data can be reliably scaled to compare to the astronomical spectra. We find that the fractional percentage contribution to the 5–8
μ
m region for Mon R2 IRS 3 ranges between 2.7 and 3.9 for neutral PAHs and 0.25–1.2 for H
n
-PAHs. The best match to the observed 3.25
μ
m profile in the Mon R2 IRS 3 spectrum is accomplished with the laboratory-measured coronene:H
2
O spectrum. Using this spectrum we estimate that neutral PAHs contribute up to 12.0% of the cosmic carbon budget for Mon R2 IRS 3 and <14.5% for Elias 16. Neutral hydrogenated PAHs contribute mainly to the 3.47
μ
m absorption and very little to the 5 to 8
μ
m region. For neutral H
n
-PAHs, we estimate that they contribute up to 0.6% of the cosmic carbon budget for Mon R2 IRS 3 and <1% for Elias 16.</abstract><cop>Philadelphia</cop><pub>IOP Publishing</pub><doi>10.3847/1538-4357/abd6e8</doi><orcidid>https://orcid.org/0000-0002-3141-0630</orcidid><orcidid>https://orcid.org/0000-0003-1153-7850</orcidid><orcidid>https://orcid.org/0000-0001-7023-8282</orcidid><orcidid>https://orcid.org/0000-0003-2029-1549</orcidid><oa>free_for_read</oa></addata></record> |
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| source | IOP Publishing Free Content; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Absorption Absorption spectra Astrophysics Carbon Carbon budget Celestial bodies Hydrogenation Infrared absorption Laboratories Polycyclic aromatic hydrocarbons Vapor phases |
| title | Assessment of the Presence of PAHs and Hydrogenated PAHs in the Young Stellar Object Mon R2 and the Taurus Dense Cloud Toward Elias 16 |
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