Query : 2008A&A...488L...5L

2008A&A...488L...5L - Astronomy and Astrophysics, volume 488, L5-8 (2008/9-2)

Mechanical feedback in the molecular ISM of luminous IR galaxies.


Abstract (from CDS):

Molecular emission lines originating in the nuclei of luminous infra-red galaxies are used to determine the physical properties of the nuclear ISM in these systems. A large observational database of molecular emission lines is compared with model predictions that include heating by UV and X-ray radiation, mechanical heating, and the effects of cosmic rays.The observed line ratios and model predictions imply a separation of the observed systems into three groups: XDRs, UV-dominated high-density (n≥105cm–3) PDRs, and lower-density (n=104.5cm–3) PDRs that are dominated by mechanical feedback.The division of the two types of PDRs follows naturally from the evolution of the star formation cycle of these sources, which evolves from deeply embedded young stars, resulting in high-density (n≥105cm–3) PDRs, to a stage where the gas density has decreased (n=104.5cm–3) and mechanical feedback from supernova shocks dominates the heating budget.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: ISM - galaxies: starburst - galaxies: active - infrared: galaxies - radio lines: galaxies

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3194 2
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5679 6

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