Imaging observations of gas and dust in NGC 4696 and implications for cooling flow models

Details Imaging observations of gas and dust in NGC 4696 and implications for cooling flow models Imaging observations of gas and dust in NGC 4696 and implications for cooling flow models

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..153s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 153-162.

Astronomy and Astrophysics

Astrophysics

124

Centaurus Constellation, Cooling Flows (Astrophysics), Cosmic Dust, Galactic Clusters, Interstellar Gas, Astronomical Models, Charge Coupled Devices, Cosmic X Rays, Emission Spectra, Heat Transfer, Infrared Radiation

Scientific paper

Continuum and emission-line direct CCD observations of the gas and dust in NGC 4696 are analyzed. The wavelength-dependence of extinction is normal. Line luminosities are derived and evidence that the gas and dust are well-mixed is presented. A total power output of the dust lane of roughly 2 x 10 to the 43rd ergs/s is deduced. Constraints on the physical conditions and geometry in the emission-line gas are inferred. An external origin for the dust-lane material is favored from the observations; infall from a gas-rich companion with a normal interstellar medium may have recently taken place. The energy input to the dust and gas of the dust lane by saturated heat conduction from the hot X-ray gas is sufficient to power the optical and infrared emission. If conduction operates, the cool gas and dust act as a heat sink for the hot X-ray atmosphere and this may mimic some of the peripheral properties of a cooling flow.

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