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Measuring the Heating and Cooling of the Interstellar Medium at High Redshift: PAH and [C ii] Observations of the Same Star-forming Galaxies at z?~?2
McKinney,Jed1; Pope,Alexandra1; Armus,Lee2; Chary,Ranga-Ram2; Díaz-Santos,Tanio3,4; Dickinson,Mark E.5; Kirkpatrick,Allison6
2020-04-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume892Issue:2
AbstractAbstract Star formation depends critically on cooling mechanisms in the interstellar medium (ISM); however, thermal properties of gas in galaxies at the peak epoch of star formation (z?~?2) remain poorly understood. A limiting factor in understanding the multiphase ISM is the lack of multiple tracers detected in the same galaxies, such as Polycyclic Aromatic Hydrocarbon (PAH) emission, a tracer of a critical photoelectric heating mechanism in interstellar gas, and [C ii] 158 μm fine-structure emission, a principal coolant. We present ALMA Band 9 observations targeting [C ii] in six z?~?2 star-forming galaxies with strong Spitzer IRS detections of PAH emission. All six galaxies are detected in dust continuum and marginally resolved. We compare the properties of PAH and [C ii] emission, and constrain their relationship as a function of total infrared luminosity (LIR) and IR surface density. [C ii] emission is detected in one galaxy at high signal-to-noise (34σ), and we place a secure upper limit on a second source. The rest of our sample are not detected in [C ii] likely due to redshift uncertainties and narrow ALMA bandpass windows. Our results are consistent with the deficit in [C ii]/LIR and PAH/LIR observed in the literature. However, the ratio of [C ii] to PAH emission at z?~?2 is possibly much lower than what is observed in nearby dusty star-forming galaxies. This could be the result of enhanced cooling via [O i] at high-z, hotter gas and dust temperatures, and/or a reduction in the photoelectric efficiency, in which the coupling between interstellar radiation and gas heating is diminished.
KeywordStarburst galaxies Galaxies Galaxy evolution Interstellar medium High-redshift galaxies Ultraluminous infrared galaxies
DOI10.3847/1538-4357/ab77b9
Language英语
WOS IDIOP:0004-637X-892-2-ab77b9
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/64163
Collection中国科学院国家天文台
Affiliation1.Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA; jhmckinney@umass.edu
2.Infrared Processing and Analysis Center, MC 314-6, Caltech, 1200 E. California Boulevard, Pasadena, CA 91125, USA
3.Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile
4.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, China
5.National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA
6.Department of Physics & Astronomy, University of Kansas, Lawrence, KS 66045, USA
Recommended Citation
GB/T 7714
McKinney,Jed,Pope,Alexandra,Armus,Lee,等. Measuring the Heating and Cooling of the Interstellar Medium at High Redshift: PAH and [C ii] Observations of the Same Star-forming Galaxies at z?~?2[J]. The Astrophysical Journal,2020,892(2).
APA McKinney,Jed.,Pope,Alexandra.,Armus,Lee.,Chary,Ranga-Ram.,Díaz-Santos,Tanio.,...&Kirkpatrick,Allison.(2020).Measuring the Heating and Cooling of the Interstellar Medium at High Redshift: PAH and [C ii] Observations of the Same Star-forming Galaxies at z?~?2.The Astrophysical Journal,892(2).
MLA McKinney,Jed,et al."Measuring the Heating and Cooling of the Interstellar Medium at High Redshift: PAH and [C ii] Observations of the Same Star-forming Galaxies at z?~?2".The Astrophysical Journal 892.2(2020).
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