Photoelectric Heating And The Physical Conditions Of The ISM: Observations Of NGC 4559 With The Herschel/PACS Spectrometer

Details Photoelectric Heating And The Physical Conditions Of The ISM: Observations Of NGC 4559 With The Herschel/PACS Spectrometer Photoelectric Heating And The Physical Conditions Of The ISM: Observations Of NGC 4559 With The Herschel/PACS Spectrometer

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725508c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #255.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The cooling of the neutral interstellar medium in galaxies is dominated by far-infrared line emission. This emission is characterized by features which reveal the physical conditions of the phases of the ISM as well as indicate the source of the heating. Despite many efforts, studies of heating and cooling via infrared line emission were hampered by a lack of spatial resolution. However, the recently launched Herschel and Spitzer space telescopes enable us to spatially map emission from mid- and far-infrared lines in nearby galaxies rather than adopting global values. We highlight early results from the KINGFISH spectroscopic program which is mapping strong cooling lines in several nearby galaxies using the Herschel Space Observatory. These observations are complemented by Spitzer/SINGS 5-35μm data to permit a full census of line and dust emission. In particular we focus on emission from resolved regions of NGC 4559, a nearby late type spiral galaxy that was part of the KINGFISH science demonstration program. Line diagnostics of most regions of emmision are consistent with predictions PDR models. Nevertheless, we have detected an excess of [C II] 157 μm emission from the diffuse portions of NGC 4559's disk. Based on observations obtained with the Herschel Space Telescope as part of KINGFISH (Key Insights on Nearby Galaxies: a Far Infrared Survey with Herschel; P.I.: R.C. Kennicutt), one of the Herschel Open Time Key Projects.

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