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First extragalactic...
First extragalactic detection of a phosphorus-bearing molecule with ALCHEMI: Phosphorus nitride (PN)
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- Haasler, D. (author)
- Universidad Rey Juan Carlos,Rey Juan Carlos University
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- Rivilla, V. M. (author)
- Istituto nazionale di astrofisica (INAF)
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- Martin, S. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Holdship, J. (author)
- University College London (UCL),Universiteit Leiden (UL),Leiden University (UL)
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- Viti, S. (author)
- University College London (UCL),Universiteit Leiden (UL),Leiden University (UL)
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- Harada, N. (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan,Academia Sinica Taiwan
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- Mangum, J. (author)
- National Radio Astronomy Observatory
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- Sakamoto, K. (author)
- Academia Sinica Taiwan
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Tanaka, K. (author)
- Keio University
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- Yoshimura, Y. (author)
- University of Tokyo, Japan
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- Nakanishi, K. (author)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Colzi, L. (author)
- Istituto nazionale di astrofisica (INAF)
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- Hunt, L. (author)
- Istituto nazionale di astrofisica (INAF)
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- Emig, K. L. (author)
- National Radio Astronomy Observatory
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- Aladro, R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Humire, P. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Henkel, C. (author)
- King Abdulaziz University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Chinese Academy of Sciences
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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(creator_code:org_t)
- 2022-03-22
- 2022
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 659
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Context. Phosphorus (P) is a crucial element for life given its central role in several biomolecules. P-bearing molecules have been discovered in different regions of the Milky Way, but not yet towards an extragalactic environment. Aims. We searched for P-bearing molecules outside the Milky Way towards the nearby starburst Galaxy NGC 253. Methods. Using observations from the ALMA Comprehensive High-resolution Extragalactic Molecular Inventory (ALCHEMI) project, we used the MAdrid Data CUBe Analysis package to model the emission of P-bearing molecules assuming local thermodynamic equilibrium (LTE) conditions. We also performed a non-LTE analysis using SpectralRadex. Results. We report the detection of a P-bearing molecule, phosphorus nitride (PN), for the first time in an extragalactic environment, towards two giant molecular clouds (GMCs) of NGC 253. The LTE analysis yields total PN beam-averaged column densities N = (1.20 +/- 0.09) x 10(13) cm(-2) and N = (6.5 +/- 1.6) x 10(12) cm(-2), which translate into abundances with respect to H-2 of chi = (8.0 +/- 1.0) x 10(-12) and chi = (4.4 +/- 1.2) x 10(-12). We derived a low excitation temperature of T-ex = (4.4 +/- 1.3) K towards the GMC with the brightest PN emission, which indicates that PN is sub-thermally excited. The non-LTE analysis results in column densities consistent with the LTE values. We also searched for other P-bearing molecules (PO, PH3, CP, and CCP), and upper limits were derived. The derived PO/PN ratios are < 1.3 and < 1.7. The abundance ratio between PN and the shock-tracer SiO derived towards NGC 253 follows the same trend previously found towards Galactic sources. Conclusions. Comparison of the observations with chemical models indicates that the derived molecular abundances of PN in NGC 253 can be explained by shock-driven chemistry followed by cosmic-ray-driven photochemistry.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- individual
- galaxies
- ISM
- clouds
- abundances
- ISM
- astrochemistry
- NGC 253
- molecules
- ISM
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Haasler, D.
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Rivilla, V. M.
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Martin, S.
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Holdship, J.
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Viti, S.
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Harada, N.
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show more...
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Mangum, J.
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Sakamoto, K.
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Muller, Sebastie ...
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Tanaka, K.
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Yoshimura, Y.
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Nakanishi, K.
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Colzi, L.
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Hunt, L.
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Emig, K. L.
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Aladro, R.
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Humire, P.
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Henkel, C.
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van der Werf, P.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astronomy and As ...
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Chalmers University of Technology