Far-Infrared Spectroscopy with ISO: The Physical Conditions of the ISM in the Normal Spiral Galaxy NGC 5713

Details Far-Infrared Spectroscopy with ISO: The Physical Conditions of the ISM in the Normal Spiral Galaxy NGC 5713 Far-Infrared Spectroscopy with ISO: The Physical Conditions of the ISM in the Normal Spiral Galaxy NGC 5713

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.6302l&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #63.02; Bulletin of the American Astronomical Society, Vol. 28, p.929

Astronomy and Astrophysics

Astronomy

Scientific paper

We report new ISO Long Wavelength Spectrometer (LWS) observations of the SAB(rs)bc galaxy NGC 5713. These are the first LWS results from our ``US Key Project'' on normal galaxies (Helou et al. 1996) which uses ISO LWS, CAM, and PHOT observations to study ISM properties in normal galaxies. We have obtained strong detections of the fine-structure forbidden transitions of [CII] at 158 mu m and [OI] at 63 mu m; tentative detections of [NII] at 122 mu m and [OIII] at 88 mu m; and significant upper limits for [NIII] at 57 mu m and [OIII] at 52 mu m. We also clearly detect the continuum dust emission between 40 and 197 mu m. The aperture size of the instrument corresponds to roughly 12 kpc at the distance of NGC 5713. The measurements of the continuum and of the [CII], [OI] and [OIII] line fluxes can be combined to derive the temperature of the warm atomic gas surrounding molecular clouds, the incident UV flux on the clouds and the gas pressure in different phases of the ISM. Combining the ISO measurements with CO observations from the literature, we can determine typical cloud sizes and filling factors.

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