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Super-solar N/C in the NLS1 Galaxy Markarian 1044

Dale L. Fields·Smita Mathur·Richard W. Pogge·Fabrizio Nicastro·Stefanie Komossa
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Abstract

Narrow-Line Seyfert 1s (NLS1s) are known to have extreme values of a number of properties compared to Active Galactic Nuclei (AGN) as a class. In particular, previous emission-line studies have suggested that NLS1s are unusually metal rich compared to broad-line AGN of comparable luminosity. We present low- and medium-resolution spectroscopic observations of the NLS1 Markarian 1044 with the Hubble Space Telescope Imaging Spectrometer (STIS). We identify two blueshifted intrinsic absorption systems at -1145 and -295 km/s relative to the systemic velocity of the galaxy. Using a simple photoionization model of the absorbing gas, we find that the strongest and best-measured of the absorption systems has N/C approximately 6.96 times the solar value. We also report on the discovery of three new Ly-alpha forest lines with neutral Hydrogen column density log greater than 12.77 in the log. This number is consistent with the 2.6 expected in the path length to the source redshift of Mrk 1044.

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Dale L. Fields, Smita Mathur, Richard W. Pogge, Fabrizio Nicastro, Stefanie Komossa. 2004-06-01. Super-solar N/C in the NLS1 Galaxy Markarian 1044. https://doi.org/10.1086/426805

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