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Article: A self-consistent photoionization-dust continuum-molecular line transfer model of NGC 7027
Title | A self-consistent photoionization-dust continuum-molecular line transfer model of NGC 7027 |
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Authors | |
Keywords | Dust, Extinction Ism: Individual (Ngc 7027) Ism: Molecules Molecular Processes Radiative Transfer |
Issue Date | 1997 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X |
Citation | The Astrophysical Journal, 1997, v. 477 n. 2 pt. 1, p. 722-731 How to Cite? |
Abstract | A model to simulate the entire spectrum (1000 Å to 1 cm) of the high-excitation young planetary nebula NGC 7027 is presented. The ionized, dust, and molecular components of the object are modeled using geometric parameters obtained from visible, radio, infrared, and CO data. The physical processes considered include recombination lines of H and He, collisional excited lines of metals, bf and ff continuum radiations, two-photon radiation, dust continuum radiation, and molecular rotational and vibrational transitions. The dust component is assumed to be heated by a combination of direct starlight and the line and continuum radiation from the ionized nebula. The molecular component of the nebula is coupled to the dust component through the stimulated absorption of the dust continuum radiation. Specifically, we compare the predicted fluxes of the CO rotational lines and the 179.5 μm water rotational line to those observed by the Infrared Space Observatory satellite. From the observed ratio of these lines, we derived a gas phase water-to-H 2 abundance ratio of 3.2 × 10 -7 assuming that the water is uniformly mixed with the CO. © 1997. The American Astronomical Society. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/179686 |
ISSN | 2023 Impact Factor: 4.8 2023 SCImago Journal Rankings: 1.905 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Volk, K | en_US |
dc.contributor.author | Kwok, S | en_US |
dc.date.accessioned | 2012-12-19T10:02:50Z | - |
dc.date.available | 2012-12-19T10:02:50Z | - |
dc.date.issued | 1997 | en_US |
dc.identifier.citation | The Astrophysical Journal, 1997, v. 477 n. 2 pt. 1, p. 722-731 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/179686 | - |
dc.description.abstract | A model to simulate the entire spectrum (1000 Å to 1 cm) of the high-excitation young planetary nebula NGC 7027 is presented. The ionized, dust, and molecular components of the object are modeled using geometric parameters obtained from visible, radio, infrared, and CO data. The physical processes considered include recombination lines of H and He, collisional excited lines of metals, bf and ff continuum radiations, two-photon radiation, dust continuum radiation, and molecular rotational and vibrational transitions. The dust component is assumed to be heated by a combination of direct starlight and the line and continuum radiation from the ionized nebula. The molecular component of the nebula is coupled to the dust component through the stimulated absorption of the dust continuum radiation. Specifically, we compare the predicted fluxes of the CO rotational lines and the 179.5 μm water rotational line to those observed by the Infrared Space Observatory satellite. From the observed ratio of these lines, we derived a gas phase water-to-H 2 abundance ratio of 3.2 × 10 -7 assuming that the water is uniformly mixed with the CO. © 1997. The American Astronomical Society. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X | en_US |
dc.relation.ispartof | The Astrophysical Journal | en_US |
dc.subject | Dust, Extinction | en_US |
dc.subject | Ism: Individual (Ngc 7027) | en_US |
dc.subject | Ism: Molecules | en_US |
dc.subject | Molecular Processes | en_US |
dc.subject | Radiative Transfer | en_US |
dc.title | A self-consistent photoionization-dust continuum-molecular line transfer model of NGC 7027 | en_US |
dc.type | Article | en_US |
dc.identifier.email | Kwok, S: deannote@hku.hk | en_US |
dc.identifier.authority | Kwok, S=rp00716 | en_US |
dc.description.nature | published_or_final_version | en_US |
dc.identifier.doi | 10.1086/303734 | en_US |
dc.identifier.scopus | eid_2-s2.0-21744435345 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-21744435345&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 477 | en_US |
dc.identifier.issue | 2 pt. 1 | en_US |
dc.identifier.spage | 722 | en_US |
dc.identifier.epage | 731 | en_US |
dc.identifier.isi | WOS:A1997WM09000018 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Volk, K=7006571965 | en_US |
dc.identifier.scopusauthorid | Kwok, S=22980498300 | en_US |
dc.identifier.issnl | 0004-637X | - |