dc.contributor.author |
Rakshit, S |
|
dc.contributor.author |
Stalin, C. S |
|
dc.contributor.author |
Kotilainen, Jari |
|
dc.contributor.author |
Shin, Jaejin |
|
dc.date.accessioned |
2021-06-28T09:38:47Z |
|
dc.date.available |
2021-06-28T09:38:47Z |
|
dc.date.issued |
2021-03 |
|
dc.identifier.citation |
The Astrophysical Journal Supplement Series, Vol. 253, No. 1, 28 |
en_US |
dc.identifier.issn |
1538-4365 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/7736 |
|
dc.description |
Restricted Access |
en_US |
dc.description.abstract |
The study of narrow-line Seyfert 1 galaxies (NLS1s) is now mostly limited to low redshift (z < 0.8) because their definition requires the presence of the Hβ emission line, which is redshifted out of the spectral coverage of major ground-based spectroscopic surveys at z > 0.8. We studied the correlation between the properties of Hβ 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(Mg II) = (0.880 ± 0.005) × FWHM(Hβ) + (0.438 ± 0.018), we present a sample of high-z NLS1 candidates having FWHM of Mg ii < 2000 km s−1. The high-z sample contains 2684 NLS1s with redshift z = 0.8–2.5 with a median logarithmic bolometric luminosity of 46.16 ± 0.42 erg s−1, logarithmic black hole mass of 8.01 ± 0.35 M⊙, and logarithmic Eddington ratio of 0.02 ± 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. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
IOP Publishing |
en_US |
dc.relation.uri |
https://doi.org/10.3847/1538-4365/abd9bb |
|
dc.rights |
© The American Astronomical Society |
|
dc.subject |
Quasars |
en_US |
dc.subject |
Supermassive black holes |
en_US |
dc.subject |
Spectroscopy |
en_US |
dc.title |
High-redshift narrow-line Seyfert 1 galaxies: a candidate sample |
en_US |
dc.type |
Article |
en_US |