Spectrophotometry of the nucleus of the galaxy Arakelyan 144

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Astronomical Spectroscopy, Galactic Nuclei, Line Spectra, Spectrophotometry, Abundance, Emission Spectra, Forbidden Transitions, H Beta Line, Nitrogen Ions, Sulfur

Scientific paper

A spectrophotometric analysis of 6-m telescope spectra of the galaxy Arakelyan 144 shows strong forbidden lines of S(+), implying a very high gas electron temperature. The H-beta flux density and luminosity are 3.16 x 10 to the -15th erg/sq cm per sec and 4.8 x 10 to the 39th erg/sec, respectively. Gas mass is 1000 solar masses. The UV emission of about 2000 07 V stars would be sufficient to maintain the gas in ionization-recombination equilibrium. While the relative abundance of S(+) ions is an order of magnitude higher than average for the various types of emission-line objects, the N(+) abundance is typical for galaxies of all types other than Seyfert 1.

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