Karl Gebhardt

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Publications (194)

• Satellite Streaks in HETDEX: Spectra, Orbital Identification, and Survey Impact
  The Astronomical Journal 2026 DOI: 10.3847/1538-3881/aeb0a7
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• DZ White Dwarfs from HETDEX: New Identifications and Reclassifications
  The Astrophysical Journal 2026 DOI: 10.3847/1538-4357/aea985
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• Population III Host Candidates at z ∼ 2: Strong He II λ1640 and Absent Ultraviolet Metal Lines in HETDEX Lyα Emitters
  The Astrophysical Journal 2026 DOI: 10.3847/1538-4357/aea6d9
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• A Supermassive Black Hole Mass Measurement in NGC 5102 with Schwarzschild Orbit-superposition Modeling
  Thomas K. Waters, Kayhan Gültekin, Karl Gebhardt +2 more
  The Astrophysical Journal 2026 DOI: 10.3847/1538-4357/ae8793
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• HETDEX Public Data Release 1: Source Catalog 2 and Data Cubes from ∼90 deg2 of Integral-field Optical Spectroscopy
  The Astrophysical Journal Supplement Series 2026 DOI: 10.3847/1538-4365/ae6068
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• Emission-line Variable Active Galactic Nuclei at Cosmic Noon from HETDEX
  The Astrophysical Journal Supplement Series 2026 DOI: 10.3847/1538-4365/ae5803
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• Enhancing Lyα Emitter Identification in HETDEX with a Convolutional Neural Network
  The Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae5baf
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• The Redshift Evolution of Extended Lyα Emission in HETDEX. I. Imaging Methods and Emission Measurements
  The Astrophysical Journal 2026 DOI: 10.3847/1538-4357/ae4de7
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• Lyα Nebulae in HETDEX: The Largest Statistical Census Bridging Lyα Halos and Blobs across Cosmic Noon
  The Astrophysical Journal 2026 DOI: 10.3847/1538-4357/ae44f3
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• Lyα Intensity Mapping in HETDEX: Galaxy-Lyα Intensity Cross-power Spectrum
  The Astrophysical Journal 2026 DOI: 10.3847/1538-4357/ae3a98
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• DESI Spectroscopy of HETDEX Emission-line Candidates. I. Line Discrimination Validation
  The Astrophysical Journal 2025 DOI: 10.3847/1538-4357/ae1ae6
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• Modeling the “Dark-matter Dominated” Dwarf Galaxy Segue 1 with a Supermassive Black Hole
  The Astrophysical Journal Letters 2025 DOI: 10.3847/2041-8213/ae0b4f
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• White Dwarfs with Infrared Excess in the HET Dark Energy Experiment
  The Astrophysical Journal 2025 DOI: 10.3847/1538-4357/adff84
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• The HETDEX Survey: Probing Neutral Hydrogen in the Circumgalactic Medium of ∼88,000 Lyα Emitters
  The Astrophysical Journal 2025 DOI: 10.3847/1538-4357/adf10e
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• Using Lyα Absorption to Measure the Intensity and Variability of z ∼ 2.4 Ultraviolet Background Light
  The Astrophysical Journal 2025 DOI: 10.3847/1538-4357/adc0f9
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• Keplerian molecular gas disk and black hole mass of NGC 4751
  J. Osorno, Neil M. Nagar, T. Richtler +6 more
  Astronomy & Astrophysics 2025 DOI: 10.1051/0004-6361/202349086
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• The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release
  The Astrophysical Journal Supplement Series 2025 DOI: 10.3847/1538-4365/ada4a5
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• The Lyα Dependence on Nebular Properties from the HETDEX and MOSDEF Surveys
  The Astrophysical Journal 2024 DOI: 10.3847/1538-4357/ad7a00
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• Modeling ALMA Observations of the Warped Molecular Gas Disk in the Red Nugget Relic Galaxy NGC 384
  Jonathan H. Cohn, Maeve Curliss, Jonelle L. Walsh +9 more
  The Astrophysical Journal 2024 DOI: 10.3847/1538-4357/ad7bb0
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• Participatory Science and Machine Learning Applied to Millions of Sources in the Hobby–Eberly Telescope Dark Energy Experiment
  The Astrophysical Journal 2024 DOI: 10.3847/1538-4357/ad782c
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