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http://hdl.handle.net/20.500.12386/27820
Title: | First Measurement of the 14N/15N Ratio in the Analog of the Sun Progenitor OMC-2 FIR4 | Authors: | Kahane, Claudine Jaber Al-Edhari, Ali Ceccarelli, Cecilia López-Sepulcre, Ana FONTANI, FRANCESCO Kama, Mihkel |
Issue Date: | 2018 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 852 | Issue: | 2 | First Page: | 130 | Abstract: | We present a complete census of the <SUP>14</SUP>N/<SUP>15</SUP>N isotopic ratio in the most abundant N-bearing molecules toward the cold envelope of the protocluster OMC-2 FIR4, the best known Sun progenitor. To this scope, we analyzed the unbiased spectral survey obtained with the IRAM 30 m telescope at 3, 2, and 1 mm. We detected several lines of CN, HCN, HNC, HC<SUB>3</SUB>N, N<SUB>2</SUB>H<SUP>+</SUP>, and their respective <SUP>13</SUP>C and <SUP>15</SUP>N isotopologues. The lines’ relative fluxes are compatible with LTE conditions, and moderate line opacities have been corrected via a population diagram method or theoretical relative intensity ratios of the hyperfine structures. The five species lead to very similar <SUP>14</SUP>N/<SUP>15</SUP>N isotopic ratios, without any systematic difference between amine- and nitrile-bearing species as previously found in other protostellar sources. The weighted average of the <SUP>14</SUP>N/<SUP>15</SUP>N isotopic ratio is 270 ± 30. This <SUP>14</SUP>N/<SUP>15</SUP>N value is remarkably consistent with the [250-350] range measured for the local galactic ratio but significantly differs from the ratio measured in comets (around 140). High-angular resolution observations are needed to examine whether this discrepancy is maintained at smaller scales. In addition, using the CN, HCN, and HC<SUB>3</SUB>N lines, we derived a <SUP>12</SUP>C/<SUP>13</SUP>C isotopic ratio of 50 ± 5. | URI: | http://hdl.handle.net/20.500.12386/27820 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aa9e88 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aa9e88 | Bibcode ADS: | 2018ApJ...852..130K | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Kahane_2018_ApJ_852_130.pdf | Pdf editoriale | 2.39 MB | Adobe PDF | View/Open |
1712.01564.pdf | postprint | 862.4 kB | Adobe PDF | View/Open |
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