HIGH-REDSHIFT NARROW LINE SEYFERT 1 GALAXIES: A CANDIDATE SAMPLE

<p>The study of Narrow line Seyfert 1 galaxies (NLS1s) is now mostly limited to low redshift (z &lt; 0.8). This is because their definition requires the presence of the H&beta; emission line, which is red-shifted out of the spectral coverage of major ground-based spectroscopic surveys at z &gt; 0.8. We studied the correlation between the properties of H&beta; and Mg II lines of a large sample of SDSS DR14 quasars to find high-z NLS1 candidates. Based on the strong correlation of FWHM(MgII)=(0.880&plusmn;0.005)&times;FWHM(H&beta;)+(0.438&plusmn;0.018), we present a sample of high-z NLS1 candidates having FWHM of Mg II &lt; 2000 km s&minus;1. The high-z sample contains 2684 NLS1s with redshift z = 0.8 &minus; 2.5 with a median logarithmic bolometric luminosity of 46.16 &plusmn; 0.42 erg s&minus;1, logarithmic black hole mass of 8.01 &plusmn; 0.35M⊙, and logarithmic Eddington ratio of 0.02 &plusmn; 0.27. The fraction of radio-detected high-z NLS1s is similar to that of the low-z NLS1s and SDSS DR14 quasars at a similar redshift range and their radio luminosity is found to be strongly correlated with their black hole mass.</p> <p>This&nbsp;page contains the catalog of high-z NLS1 candidates.&nbsp;</p>