The Luminosity function of Narrow-Line Seyfert galaxies based on SDSS data

TL;DR

This paper measures the luminosity function of Narrow-Line Seyfert 1 galaxies using SDSS data, introducing a new calculation approach and accounting for cosmic structure variations, with results aligning with X-ray observations.

Contribution

It presents a novel method for calculating the AGN luminosity function that considers large-scale structure effects and applies it specifically to Narrow-Line Seyfert 1 galaxies.

Findings

NLSy1 galaxies occupy a narrower nuclear luminosity range than BLSy1.

The luminosity function results agree with X-ray luminosity predictions.

NLSy1 and BLSy1 have similar average luminosities within errors.

Abstract

We present measurements of AGN type 1 luminosity function in the forbidden line [OIII]5007\AA using data from SDSS DR7. A special attention is paid to a subclass of Seyfert galaxies - the Narrow-Line Seyfert galaxies. These galaxies have relatively narrow broad permitted emission lines with FWHM $\leq 2000$ km/s. A new approach in calculation of the luminosity function is presented. We also account for the large-scale structure variations of the Universe density. The results obtained are compared with the ones from the literature. A prediction of x-ray luminosity function based on our results shows an agreement with observations. One of our preliminary conclusions is that NLSy1 seem to occupy a more narrow range in the nuclear luminosity than BLSy1, but the average values are within errors.