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6 papers · 2 filters
Transient and Highly Polarized Double-Peaked H-alpha Emission in the Seyfert 2 Nucleus of NGC 2110
Edward C. Moran, Aaron J. Barth, Michael Eracleous +1
We have discovered an extremely broad, double-peaked H-alpha emission line in the polarized flux spectrum of NGC 2110, establishing that this well-studied Seyfert 2 galaxy contains…
Very high energy observations of the BL Lac objects 3C 66A and OJ 287
T. Lindner, D. S. Hanna, J. Kildea +15
Using the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE), we have observed the BL Lac objects 3C 66A and OJ 287. These are members of the class of low-frequency-peake…
"Hidden" Seyfert 2 Galaxies in the Chandra Deep Field North
Carolin N. Cardamone, Edward C. Moran, Laura E. Kay
We have compared the X-ray--to--optical flux ratios (F_x/F_opt) of absorbed active galactic nuclei (AGNs) in the Chandra Deep Field North (CDF-N) with those of nearby, optically cl…
Does the Blazar Gamma-Ray Spectrum Harden with Increasing Flux? Analysis of 9 Years of EGRET Data
Giridhar Nandikotkur, Keith M. Jahoda, R. C. Hartman +5
The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory (CGRO) discovered gamma-ray emission from more than 67 blazars during its 9 yr lifetime. W…
Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope
D. Horan, R. W. Atkins, H. M. Badran +56
Gamma-ray burst (GRB) observations at very high energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE compon…
Activity and Kinematics of Ultracool Dwarfs Including An Amazing Flare Observation
Sarah J. Schmidt, Kelle L. Cruz, Bethany J. Bongiorno +2
We present the activity and kinematics of a representative volume-limited (20 pc) sample of 152 late-M and L dwarfs (M7--L8) photometrically selected from the Two Micron All-Sky Su…