activity
19992025
most citedChandra Detects Relativistic Broad Absorption Lines from APM 08279+5255

288 citations · 1.1k across the 12 of their papers we have counts for

collaborators

11 papers

astro-ph.GA2025

Exploring the Spectral Energy Distributions of Luminous Broad Absorption Line Quasars at High Redshift

Harum Ahmed, Sarah C. Gallagher, Ohad Shemmer +4

We present the multiwavelength spectral energy distributions (SEDs) for 65 luminous broad absorption line (BAL) quasars with redshifts from the Gemi…

astro-ph.GA2024

Gemini Near Infrared Spectrograph -- Distant Quasar Survey: Rest-Frame Ultraviolet-Optical Spectral Properties of Broad Absorption Line Quasars

Harum Ahmed, Ohad Shemmer, Brandon Matthews +12

We present the rest-frame ultraviolet-optical spectral properties of 65 broad absorption line (BAL) quasars from the Gemini Near Infrared Spectrograph-Distant Quasar Survey (GNIRS-…

astro-ph.CO2009★ 2 cited

X-raying the Winds of Luminous Active Galaxies

W. N. Brandt, G. Chartas, S. C. Gallagher +2

We briefly describe some recent observational results, mainly at X-ray wavelengths, on the winds of luminous active galactic nuclei (AGNs). These winds likely play a significant ro…

astro-ph2005★ 33 cited

Variation in the Scattering Shroud Surrounding Markarian 231

S. C. Gallagher, Gary D. Schmidt, Paul S. Smith +5

We present a detailed study of the nuclear structure of the highly polarized broad absorption line quasar, Mrk 231, through a multiwavelength campaign of Chandra observations, opti…

astro-ph2003★ 209 cited

XMM-NEWTON Reveals the Quasar Outflow in PG 1115+080

G. Chartas, W. N. Brandt, S. C. Gallagher

We report on an observation of the Broad Absorption Line (BAL) quasar PG 1115+080 performed with the XMM-Newton observatory. Spectral analysis reveals the second case of a relativi…

astro-ph2002★ 185 cited

The Chandra Deep Field-North Survey. XIV. X-ray detected Obscured AGNs and Starburst Galaxies in the Bright Submm Source Population

D. M. Alexander, F. E. Bauer, W. N. Brandt +6

We provide X-ray constraints and perform the first X-ray spectral analyses for bright (f_850>=5mJy; S/N>=4) SCUBA sources in an 8.4'x8.4' area of the 2 Ms Chandra Deep Field-North…