Abstract:
We present the results of our broadband study of the
γ
-ray emitting narrow line Seyfert 1
(
NLSy1
)
galaxy SBS
0846
+
513
(
z
=
0.585
)
. This includes multiband
fl
ux variations,
γ
-ray spectral analysis, broadband spectral energy
distribution
(
SED
)
modeling, and intranight optical variability
(
INOV
)
observations carried out over six nights
between 2012 November and 2013 March using the 2 m Himalayan
Chandra
Telescope and the 1.3 m telescope at
Devasthal, India. Multiple episodes of
fl
aring activity are seen in the
γ
-ray light curve of the source which are also
re
fl
ected in the observations at lower frequencies. A statistically signi
fi
cant curvature is noticed in the seven years
averaged
γ
-ray spectrum, thus indicating its similarity with powerful
fl
at spectrum radio quasars
(
FSRQs
)
.
Modeling the SEDs with a one-zone leptonic emission model hints that the optical UV spectrum is dominated by
synchrotron radiation, whereas inverse Compton scattering of broad line region photons reproduces the
γ
-ray part
of the SEDs. The source was found to be variable on all the six nights of optical observations with a variation of
∼
0.3 mag within a single night, coinciding with a high
γ
-ray activity state. The observed large amplitude INOV
clearly indicates the presence of a closely aligned beamed relativistic jet in SBS 0846
+
513. Our broadband study
supports the recent claims in literature that
γ
-ray emitting NLSy1 galaxies are similar to blazars and constitute the
low black hole mass counterparts to FSRQs.
