ALMA Observations of Nearby Luminous Infrared Galaxies with Various AGN Energetic Contributions Using Dense Gas Tracers
arXiv:1404.6597 · doi:10.1088/0004-6256/148/1/9
Abstract
We present the results of our ALMA Cycle 0 observations, using HCN/HCO+/HNC J=4-3 lines, of six nearby luminous infrared galaxies with various energetic contributions from active galactic nuclei (AGNs) estimated from previous infrared spectroscopy. These lines are very effective for probing the physical properties of high-density molecular gas around the hidden energy sources in the nuclear regions of these galaxies. We find that HCN to HCO+ J=4-3 flux ratios tend to be higher in AGN-important galaxies than in starburst-dominated regions, as was seen at the J=1-0 transition, while there is no clear difference in the HCN-to-HNC J=4-3 flux ratios among observed sources. A galaxy with a starburst-type infrared spectral shape and very large molecular line widths shows a high HCN-to-HCO+ J=4-3 flux ratio, which could be due to turbulence-induced heating. We propose that enhanced HCN J=4-3 emission relative to HCO+ J=4-3 could be used to detect more energetic activity than normal starbursts, including deeply buried AGNs, in dusty galaxy populations.
27 pages, 11 figures, accepted for publication in AJ
References in corpus (22)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Diagnostics of irradiated dense gas in galaxy nuclei. II. A grid of XDR and PDR models
- Spitzer Quasar and ULIRG Evolution Study (QUEST): II. The Spectral Energy Distributions of Palomar-Green Quasars
- A multi-transition HCN and HCO+ study of 12 nearby active galaxies: AGN versus SB environments
- Spitzer Quasar and ULIRG evolution study (QUEST): I. The origin of the far infrared continuum of QSOs
- Spitzer's Contribution to the AGN Population
- Evidence of enhanced star formation efficiency in luminous and ultraluminous infrared galaxies
- A Spitzer IRS Low-Resolution Spectroscopic Search for Buried AGNs in Nearby Ultraluminous Infrared Galaxies - A Constraint on Geometry between Energy Sources and Dust -
- Spitzer Mid-to-Far-Infrared Flux Densities of Distant Galaxies
- Spitzer Mid-Infrared Spectroscopy of Infrared Luminous Galaxies at z~2 II: Diagnostics
- Vibrationally Excited HCN in the Luminous Infrared Galaxy NGC 4418
- Aromatic Features in AGN: Star-Forming Infrared Luminosity Function of AGN Host Galaxies
- HCN versus HCO+ as dense molecular gas mass tracer in Luminous Infrared Galaxies
- Millimeter Interferometric HCN(1-0) and HCO+(1-0) Observations of Luminous Infrared Galaxies
- Nobeyama Millimeter Interferometric HCN(1-0) and HCO+(1-0) Observations of Further Luminous Infrared Galaxies
- Spitzer IRS Spectra of Optically Faint Infrared Sources with Weak Spectral Features
- Millimeter Interferometric Investigations of the Energy Sources of Three Ultraluminous Infrared Galaxies, UGC 5101, Mrk 273, and IRAS 17208-0014, based on HCN to HCO+ Ratios
- Nuclear/Circumnuclear Starbursts and Active Galactic Nuclei Mass Accretion in Seyfert Galaxies
- Infrared 3-4 Micron Spectroscopy of Infrared Luminous Galaxies with Possible Signatures of Obscured Active Galactic Nuclei
- The ~0.9 mJy sample: A mid-infrared spectroscopic catalog of 150 infrared-luminous, 24 micron selected galaxies at 0.3<z<3.5
- A Compton Thick AGN Powering the Hyperluminous Infrared Galaxy IRAS 00182--7112
- Rapid Star Formation in the Presence of Active Galactic Nuclei
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- Planck's Dusty GEMS. VIII. Dense-gas reservoirs in the most active dusty starbursts at z~3
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