Journal ArticleDOI
Far Infrared and Submillimeter Emission from Galactic and Extragalactic Photo-Dissociation Regions
Reads0
Chats0
TLDR
In this article, the effects of metallicity and cloud extinction on the predicted line intensities were examined for PDR models with densities over the range n=10^1-10^7 cm^-3.Abstract:
Photodissociation Region (PDR) models are computed over a wide range of physical conditions, from those appropriate to giant molecular clouds illuminated by the interstellar radiation field to the conditions experienced by circumstellar disks very close to hot massive stars. These models use the most up-to-date values of atomic and molecular data, the most current chemical rate coefficients, and the newest grain photoelectric heating rates which include treatments of small grains and large molecules. In addition, we examine the effects of metallicity and cloud extinction on the predicted line intensities. Results are presented for PDR models with densities over the range n=10^1-10^7 cm^-3 and for incident far-ultraviolet radiation fields over the range G_0=10^-0.5-10^6.5, for metallicities Z=1 and 0.1 times the local Galactic value, and for a range of PDR cloud sizes. We present line strength and/or line ratio plots for a variety of useful PDR diagnostics: [C II] 158 micron, [O I] 63 and 145 micron, [C I] 370 and 609 micron, CO J=1-0, J=2-1, J=3-2, J=6-5 and J=15-14, as well as the strength of the far-infrared continuum. These plots will be useful for the interpretation of Galactic and extragalactic far infrared and submillimeter spectra observable with ISO, SOFIA, SWAS, FIRST and other orbital and suborbital platforms. As examples, we apply our results to ISO and ground based observations of M82, NGC 278, and the Large Magellenic Cloud.read more
Citations
More filters
Journal ArticleDOI
ALMA Observations of CO Emission from Luminous Lyman-break Galaxies at z = 6.0293–6.2037
Yoshiaki Ono,Seiji Fujimoto,Yuichi Harikane,Masami Ouchi,Livia Vallini,Andrea Ferrara,Takatoshi Shibuya,Andrea Pallottini,Akio K. Inoue,Masatoshi Imanishi,Kazuhiro Shimasaku,Takuya Hashimoto,Chien‐Hsiu Lee,Yuma Sugahara,Yoichi Tamura,Kotaro Kohno,Malte Schramm +16 more
TL;DR: In this article , the Atacama Large Millimeter/submillimeter Array (ALMA) observations targeting CO(6−5) emission from three luminous Lyman-break galaxies (LBGs) at z spec = 6.0293−6.2037 were presented.
Journal ArticleDOI
Ionization State in PDR (IC 63 nebula)
TL;DR: In this paper, the chemical evolution in IC 63 nebula, a photo-dominated region (PDR), was investigated and the chemical structure and the ionization state depend directly on the intensity of the incident UV radiation.
Journal ArticleDOI
A Herschel mapping of [C ii], [O i] and [O iii] lines from the circumnuclear region of M31
TL;DR: In this paper, the authors presented the first FIR spectroscopic mapping of the circumnuclear region of M31 in [C ii] 158 μm, [O i] 63 μm and [O iii] 88 μm lines with the Herschel Space Observatory, covering an ~500 × 500 pc (2' × 2') field.
Journal ArticleDOI
[CI] 370 µm and CO (7-6) and (6-5) Observations of ULIRGs with ZEUS
T. Nikola,G. Stacey,S. Hailey-Dunsheath,Thomas E. Oberst,Stephen C. Parshley,Dominic J. Benford,Johannes G. Staguhn +6 more
TL;DR: In this article, a survey of the [CI] 370 μ m fine structure line and of mid-J CO line emission from ULIRGs and starburst galaxies using our grating spectrometer ZEUS on the CSO is presented.
Journal ArticleDOI
Sagittarius B1 -- A Patchwork of H II Regions and PhotoDissociation Regions
TL;DR: In this paper, the SOFIA FIFI-LS observations of the [O I] 146 and [C II] 158 micron lines formed in the surrounding photodissociation regions (PDRs) were used to estimate densities and the far-ultraviolet intensities exciting the PDRs.