التفاصيل البيبلوغرافية
| العنوان: |
CO Emission in Infrared-selected Active Galactic Nuclei. |
| المؤلفون: |
Allison Kirkpatrick, Chelsea Sharon, Erica Keller, Alexandra Pope |
| المصدر: |
Astrophysical Journal; 7/1/2019, Vol. 879 Issue 1, p1-1, 1p |
| مصطلحات موضوعية: |
ACTIVE galactic nuclei, STELLAR luminosity function, SPECTRAL lines, STAR formation, INTERSTELLAR medium |
| مستخلص: |
In order to better understand how active galactic nuclei (AGNs) affect the interstellar media of their host galaxies, we perform a meta-analysis of the CO emission for a sample of z = 0.01–4 galaxies from the literature with existing CO detections and well-constrained AGN contributions to the infrared (67 galaxies). Using either Spitzer/IRS mid-infrared spectroscopy or Spitzer+Herschel colors we determine the fraction of the infrared luminosity in each galaxy that can be attributed to heating by the AGNs or stars. We calculate new average CO spectral line ratios (primarily from Carilli & Walter) to uniformly scale the higher-J CO detections to the ground state and accurately determine our sample’s molecular gas masses. We do not find significant differences in the gas depletion timescales/star formation efficiencies as a function of the mid-infrared AGN strength (f(AGN)MIR or LIR (AGN)), which indicates that the presence of an infrared-bright AGN is not a sufficient signpost of galaxy quenching. We also find that the dust-to-gas ratio is consistent for all sources, regardless of AGN emission, redshift, or LIR, indicating that dust is likely a reliable tracer of gas mass for massive dusty galaxies (albeit with a large degree of scatter). Finally, if we classify galaxies as either AGN or star formation dominated, we do not find a robust statistically significant difference between their CO excitation. [ABSTRACT FROM AUTHOR] |
|
Copyright of Astrophysical Journal is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder