ISO LWS Spectroscopy of NGC 4945

Details ISO LWS Spectroscopy of NGC 4945 ISO LWS Spectroscopy of NGC 4945

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.2105b&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #21.05; Bulletin of the American Astronomical Society, Vol. 29, p.1246

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have obtained fully sampled, low resolution (R=lambda / triangle lambda ~ 200) far-infrared (FIR) 42-197 mu m spectra of the southern AGN/starburst SB(s)cd galaxy NGC 4945 with the Long Wavelength Spectrometer (LWS) on the Infrared Space Observatory (ISO). The galaxy was observed at a central, NE, and SW position, each separated by 165'' with the instrument's ~ 75" aperture. The forbidden fine-structure transitions of [CII] 158 mu m and [OI] 63 mu m lines were detected at each position. Detections of the [OI] 145 mu m and [OIII] 88 mu m lines were also obtained at some positions. Using these lines and the total FIR continuum flux, we have modeled the properties of the warm atomic gas with photodissociation region (PDR) models (Tielens and Hollenbach, 1985; Wolfire et al. 1990; Kaufman et al. 1998). The low-J rotational transitions of OH at 53 mu m and 119 mu m are seen in absorption at the nuclear position. The total OH column density and the role of these lines in the pumping of the OH radio maser are considered for these two transitions. The NE and SW positions lie on the massive molecular ring. The ring versus the nuclear conditions are analyzed by comparing the CII/OI, CII/CO, and (CII+OI)/FIR ratios.

Affiliated with

Also associated with

No associations

Rating

ISO LWS Spectroscopy of NGC 4945 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ISO LWS Spectroscopy of NGC 4945, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ISO LWS Spectroscopy of NGC 4945 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1173529