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The Mid-Infrared High-Ionization Lines from Active Galactic Nuclei and Star-Forming Galaxies
Miguel Pereira-Santaella, Aleksandar M. Diamond-Stanic, Almudena Alonso-Herrero +1
We used Spitzer/IRS spectroscopic data on 426 galaxies including quasars, Seyferts, LINER and HII galaxies to investigate the relationship among the mid-IR emission lines. There is…
The Effect of Active Galactic Nuclei on the Mid-Infrared Aromatic Features
Aleksandar M. Diamond-Stanic, George H. Rieke
We present Spitzer measurements of the aromatic (also known as PAH) features for 35 Seyfert galaxies from the revised Shapley-Ames sample and find that the relative strengths of th…
Weak-Line Quasars at High Redshift: Extremely High Accretion Rates or Anemic Broad-Line Regions?
Ohad Shemmer, Benny Trakhtenbrot, Scott F. Anderson +9
We present Gemini-North K-band spectra of two representative members of the class of high-redshift quasars with exceptionally weak rest-frame ultraviolet emission lines (WLQs), SDS…
Multiwavelength Observations of Radio-quiet Quasars with Weak Emission Lines
Richard M. Plotkin, Scott F. Anderson, W. N. Brandt +5
We present radio and X-ray observations, as well as optical light curves, for a subset of 26 BL Lac candidates from the Sloan Digital Sky Survey (SDSS) lacking strong radio emissio…
Unobscured Type 2 AGNs
Yong Shi, George H. Rieke, Paul Smith +5
Type 2 AGNs with intrinsically weak broad emission lines (BELs) would be exceptions to the unified model. After examining a number of proposed candidates critically, we find that t…