Bibcode
DOI
Stepanian, J. A.; Benítez, E.; Krongold, Y.; Cruz-González, I.; de Diego, J. A.; Chavushyan, V.; Mújica, R.; Dultzin-Hacyan, D.; Verdugo, T.
Bibliographical reference
The Astrophysical Journal, Volume 588, Issue 2, pp. 746-762.
Advertised on:
5
2003
Journal
Citations
17
Refereed citations
16
Description
In this work we present a multiwavelength study of narrow-line Seyfert 1
galaxies (NLS1s) discovered in the Second Byurakan Survey (SBS). The
sample consists of 26 objects, which have MB>=-23.0, or
-19.9>MB>-23.0, 0.02431). The traditional linear correlation
LX and Lop, which seems to hold for active
galactic nuclei in general, is found for SBS NLS1s. An anticorrelation
between the FWHM of Hβ and the ratio of Fe II λ4570/Hβ
is also observed. A weak correlation is found between
αox slope and Lop. One of our main findings
is that almost all SBS NLS1s may not have an FIR bump. Their spectral
energy distribution suggests that they may also possess a big blue bump.
The absence of an IR bump in most SBS NLS1s and the weakness of X-ray
radiation in some of them may argue against the presence of a broad-line
region. The surface density of SBS NLS1s is less than 0.015
deg-2 (B<17.5,z<0.16).