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Ionize Hard: Inters...
Ionize Hard: Interstellar PO + Detection
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- Rivilla, Víctor M. (author)
- Centro de Astrobiologia (CAB)
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- García De La Concepción, Juan (author)
- Centro de Astrobiologia (CAB)
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- Jimenez-Serra, I. (author)
- Centro de Astrobiologia (CAB)
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- Martin-Pintado, J. (author)
- Centro de Astrobiologia (CAB)
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- Colzi, L. (author)
- Centro de Astrobiologia (CAB)
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- Tercero, B. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Megías, Andrés (author)
- Centro de Astrobiologia (CAB)
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- López-Gallifa, Álvaro (author)
- Centro de Astrobiologia (CAB)
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- Martínez-Henares, Antonio (author)
- Centro de Astrobiologia (CAB)
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- Massalkhi, Sara (author)
- Centro de Astrobiologia (CAB)
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- Martin, S. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Zeng, Shaoshan (author)
- RIKEN
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- Vicente, P. de (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Rico-Villas, Fernando (author)
- Centro de Astrobiologia (CAB)
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- Requena-Torres, M. A. (author)
- University of Maryland,Towson University
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- Cosentino, Giuliana, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2022-04-26
- 2022
- English.
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In: Frontiers in Astronomy and Space Sciences. - : Frontiers Media SA. - 2296-987X. ; 9
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https://research.cha...
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https://doi.org/10.3...
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Abstract
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- We report the first detection of the phosphorus monoxide ion (PO+) in the interstellar medium. Our unbiased and very sensitive spectral survey toward the G+0.693–0.027 molecular cloud covers four different rotational transitions of this molecule, two of which (J = 1–0 and J = 2–1) appear free of contamination from other species. The fit performed, assuming local thermodynamic equilibrium conditions, yields a column density of N=(6.0 ± 0.7) × 1011 cm−2. The resulting molecular abundance with respect to molecular hydrogen is 4.5 × 10–12. The column density of PO+ normalized by the cosmic abundance of P is larger than those of NO+ and SO+, normalized by N and S, by factors of 3.6 and 2.3, respectively. The N(PO+)/N(PO) ratio is 0.12 ± 0.03, more than one order of magnitude higher than that of N(SO+)/N(SO) and N(NO+)/N(NO). These results indicate that P is more efficiently ionized than N and S in the ISM. We have performed new chemical models that confirm that the PO+ abundance is strongly enhanced in shocked regions with high values of cosmic-ray ionization rates (10–15 − 10–14 s−1), as occurring in the G+0.693–0.027 molecular cloud. The shocks sputter the interstellar icy grain mantles, releasing into the gas phase most of their P content, mainly in the form of PH3, which is converted into atomic P, and then ionized efficiently by cosmic rays, forming P+. Further reactions with O2 and OH produces PO+. The cosmic-ray ionization of PO might also contribute significantly, which would explain the high N(PO+)/N(PO) ratio observed. The relatively high gas-phase abundance of PO+ with respect to other P-bearing species stresses the relevance of this species in the interstellar chemistry of P.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Keyword
- phosphorus
- interstellar: clouds
- astrochemistry
- interstellar: ions
- interstellar: abundances
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Rivilla, Víctor ...
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García De La Con ...
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Jimenez-Serra, I ...
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Martin-Pintado, ...
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Colzi, L.
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Tercero, B.
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show more...
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Megías, Andrés
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López-Gallifa, Á ...
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Martínez-Henares ...
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Massalkhi, Sara
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Martin, S.
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Zeng, Shaoshan
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Vicente, P. de
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Rico-Villas, Fer ...
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Requena-Torres, ...
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Cosentino, Giuli ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Other Chemistry ...
- Articles in the publication
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Frontiers in Ast ...
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Chalmers University of Technology