1,255 research outputs found
Suzaku View of the Swift/BAT Active Galactic Nuclei (I): Spectral Analysis of Six AGNs and Evidence for Two Types of Obscured Population
We present a systematic spectral analysis with Suzaku of six AGNs detected in
the Swift/BAT hard X-ray (15--200 keV) survey, Swift J0138.6-4001,
J0255.2-0011, J0350.1-5019, J0505.7-2348, J0601.9-8636, and J1628.1-5145. This
is considered to be a representative sample of new AGNs without X-ray spectral
information before the BAT survey. We find that the 0.5--200 keV spectra of
these sources can be uniformly fit with a base model consisting of heavily
absorbed (log ) transmitted components,
scattered lights, a reflection component, and an iron-K emission line. There
are two distinct groups, three "new type" AGNs (including the two sources
reported by \citealt{Ueda2007}) with an extremely small scattered fraction
() and strong reflection component ( where is the solid angle of the reflector), and three
"classical type" ones with and . The
spectral parameters suggest that the new type has an optically thick torus for
Thomson scattering () with a small
opening angle viewed in a rather face-on geometry,
while the classical type has a thin torus ($N_{\rm{H}} \sim 10^{23-24} \
\rm{cm}^{-2}\theta \gtrsim 30^{\circ}$. We infer that a significant
number of new type AGNs with an edge-on view is missing in the current all-sky
hard X-ray surveys.Comment: 11 pages, 6 figures, accepted for publication in The Astrophysical
Journa
Gluino-mediated electroweak penguin with flavor-violating trilinear couplings
In light of a discrepancy of the direct violation in
decays, , we investigate gluino contributions to
the electroweak penguin, where flavor violations are induced by squark
trilinear couplings. Top-Yukawa contributions to observables are
taken into account, and vacuum stability conditions are evaluated in detail. It
is found that this scenario can explain the discrepancy of
for the squark mass smaller than 5.6 TeV. We also
show that the gluino contributions can amplify , and . Such large effects could be measured in future
experiments.Comment: 30 pages, 8 figures; references added, version published in JHE
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