Molecular tracers of high mass star-formation in external galaxies
arXiv:0712.2776 · doi:10.1086/528678
Abstract
Hot core molecules should be detectable in external active galaxies out to high redshift. We present here a detailed study of the chemistry of star-forming regions under physical conditions that differ significantly from those likely to be appropriate in the Milky Way Galaxy. We examine, in particular, the trends in molecular abundances as a function of time with respect to changes in the relevant physical parameters. These parameters include metallicity, dust:gas mass ratio, the H formation rate, relative initial elemental abundances, the cosmic ray ionization rate, and the temperature of hot cores. These trends indicate how different tracers provide information on the physical conditions and on evolutionary age. We identify hot core tracers for several observed galaxies that are considered to represent spirals, active galaxies, low-metallicity galaxies, and high-redshift galaxies. Even in low-metallicity examples, many potential molecular tracers should be present at levels high enough to allow unresolved detection of active galaxies at high redshift containing large numbers of hot cores.
11 pages, 8 figures, accepted in ApJ
References in corpus (5)
- Overluminous HNC Line Emission in Arp220, NGC4418 and Mrk231 - Global IR Pumping or XDRs?
- Comparative study of complex N- and O-bearing molecules in hot molecular cores
- A New Probe of Dense Gas at High Redshift: Detection of HCO+(5-4) Line Emission in APM 08279+5255
- Hot Cores : Probes of High-Redshift Galaxies
- Probing the feeding and feedback of AGN through molecular line maps
Cited by in corpus (10)
- Molecular line emission in NGC1068 imaged with ALMA: II. The chemistry of the dense molecular gas
- Multi-molecule ALMA observations towards the Seyfert 1 galaxy NGC 1097
- Molecular transitions as probes of the physical conditions of extragalactic environments
- Tracing high density gas in M 82 and NGC 4038
- A chemical study of carbon fractionation in external galaxies
- ALMA observations of CS in NGC 1068: chemistry and excitation
- CON-quest II. Spatially and spectrally resolved HCN/HCO+ line ratios in local luminous and ultraluminous infrared galaxies
- Mapping CS in Starburst Galaxies: Disentangling and Characterising Dense Gas
- Properties of dense molecular gas along the major axis of M 82
- Understanding molecular ratios in the carbon and oxygen poor outer Milky Way with interpretable machine learning