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  • Rivilla, Víctor M.Centro de Astrobiologia (CAB) (author)

Ionize Hard: Interstellar PO + Detection

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-04-26
  • Frontiers Media SA,2022
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:e148ce9e-cfa3-4dbf-8f1b-a0e809b2de6d
  • https://research.chalmers.se/publication/533446URI
  • https://doi.org/10.3389/fspas.2022.829288DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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 and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • García De La Concepción, JuanCentro de Astrobiologia (CAB) (author)
  • Jimenez-Serra, I.Centro de Astrobiologia (CAB) (author)
  • Martin-Pintado, J.Centro de Astrobiologia (CAB) (author)
  • Colzi, L.Centro de Astrobiologia (CAB) (author)
  • Tercero, B.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Megías, AndrésCentro de Astrobiologia (CAB) (author)
  • López-Gallifa, ÁlvaroCentro de Astrobiologia (CAB) (author)
  • Martínez-Henares, AntonioCentro de Astrobiologia (CAB) (author)
  • Massalkhi, SaraCentro de Astrobiologia (CAB) (author)
  • Martin, S.European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA) (author)
  • Zeng, ShaoshanRIKEN (author)
  • Vicente, P. deObservatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Rico-Villas, FernandoCentro de Astrobiologia (CAB) (author)
  • Requena-Torres, M. A.University of Maryland,Towson University (author)
  • Cosentino, Giuliana,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)giuliana (author)
  • Centro de Astrobiologia (CAB)Observatorio Astronómico Nacional (OAN) (creator_code:org_t)

Related titles

  • In:Frontiers in Astronomy and Space Sciences: Frontiers Media SA92296-987X

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