Mass-Luminosity Distribution and Physical Conditions of Ionized Gas in NGC 4575

Details Mass-Luminosity Distribution and Physical Conditions of Ionized Gas in NGC 4575 Mass-Luminosity Distribution and Physical Conditions of Ionized Gas in NGC 4575

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..39..201p&link_type=abstract

Astrophysics and Space Science, Volume 39, Issue 1, pp.201-211

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

Photographic photometry and spectroscopic observations of NGC 4575 suggest it to be a galaxy of reduced dimensionsD×d=14.4×13.5 kpc and of high luminosityM=-20.7. The rotation curve was also determined. Assuming a model of three homogeneous similar spheroids, we derived the density and mass distribution, and their total mass was found to be ℳ T =2.33 × 1010ℳ. The mass luminosity ratio does not vary withinr=24″, indicating that the stellar composition is similar within it, and the ratio ℳ T /ℒ T ˜1 suggests that this object contains a high proportion of young stars. From the emission lines it is found that the electronic density Ne˜100 cm-3 is relatively low in the H II regions. The abundance ratiosN(N)/N(S) andN(N)/N(H) for the nucleus and two emission regions were also derived.

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