Joseph Hennawi

Professor at Physics, University of California-Santa Barbara0 Followers

Joseph Hennawi advocates for research-driven practices in the Department of Physics at the University of California, Santa Barbara. As a dedicated professor, he is committed to fostering an environment where academic inquiry and exploration are at the forefront of the educational experience. His office, located in Broida 2015B, serves as a hub for students and colleagues to engage in meaningful discussions and collaborations. Professor Hennawi is available for consultations and academic guidance during his office hours, which are Monday through Friday, from 9 am to 12 pm and 1 pm to 4 pm, all in Pacific Standard Time (PST). His approachable demeanor and passion for physics make him a valuable resource for students seeking to deepen their understanding of the subject. Through his work, he continues to contribute to the vibrant academic community at UC Santa Barbara, inspiring the next generation of physicists.

Research Interests

Astrophysics cosmology gravitational lensing galaxy formation

Publications

1 - (Nearly) Model-independent Constraints on the Neutral Hydrogen Fraction in the Intergalactic Medium at z ∼ 5–7 Using Dark Pixel Fractions in Lyα and Lyβ Forests,The Astrophysical Journal

Xiangyu Jin , Jinyi Yang , Xiaohui Fan , Feige Wang , Eduardo Bañados , Fuyan Bian , Frederick B. Davies , Anna-Christina Eilers , Emanuele Paolo Farina , Joseph F. Hennawi , Fabio Pacucci , Bram Venemans , Fabian Walter ,

, 59, 2023-01-01

2 - EARLY AND EXTENDED HELIUM REIONIZATION OVER MORE THAN 600 MILLION YEARS OF COSMIC TIME*,The Astrophysical Journal

Gábor Worseck , J. Xavier Prochaska , Joseph F. Hennawi , Matthew McQuinn ,

, 144, 2016-07-10

3 - Spatially Resolving the Kinematics of the ≲100 μas Quasar Broad-line Region Using Spectroastrometry. II. The First Tentative Detection in a Luminous Quasar at z = 2.3,The Astrophysical Journal

Felix Bosco , Joseph F. Hennawi , Jonathan Stern , Jörg-Uwe Pott ,

, 31, 2021-09-01

4 - ALMA Reveals a Large Overdensity and Strong Clustering of Galaxies in Quasar Environments at z ∼ 4,The Astrophysical Journal

Cristina García-Vergara , Matus Rybak , Jacqueline Hodge , Joseph F. Hennawi , Roberto Decarli , Jorge González-López , Fabrizio Arrigoni-Battaia , Manuel Aravena , Emanuele P. Farina ,

, 65, 2022-03-01

5 - On the Metallicities and Kinematics of the Circumgalactic Media of Damped Lyα Systems at z ∼ 2.5*,The Astrophysical Journal

Stephanie M. Urbano Stawinski , Kate H. R. Rubin , J. Xavier Prochaska , Joseph F. Hennawi , Nicolas Tejos , Michele Fumagalli , Marc Rafelski , Evan N. Kirby , Elisabeta Lusso , Zachary Hafen ,

, 135, 2023-07-01

6 - The Evolution of the He ii-ionizing Background at Redshifts 2.3 < z < 3.8 Inferred from a Statistical Sample of 24 HST/COS He ii Lyα Absorption Spectra*,The Astrophysical Journal

Gábor Worseck , Frederick B. Davies , Joseph F. Hennawi , J. Xavier Prochaska ,

, 111, 2019-04-20

7 - Does Circumgalactic O vi Trace Low-pressure Gas Beyond the Accretion Shock? Clues from H i and Low-ion Absorption, Line Kinematics, and Dust Extinction,The Astrophysical Journal

Jonathan Stern , Claude-André Faucher-Giguère , Joseph F. Hennawi , Zachary Hafen , Sean D. Johnson , Drummond Fielding ,

, 91, 2018-09-25

8 - Strong Clustering of Lyman Break Galaxies around Luminous Quasars at Z ∼ 4* †,The Astrophysical Journal

Cristina García-Vergara , Joseph F. Hennawi , L. Felipe Barrientos , Hans-Walter Rix ,

, 7, 2017-10-05

9 - Statistical Detection of the He ii Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years,The Astrophysical Journal

Tobias M. Schmidt , Gabor Worseck , Joseph F. Hennawi , J. Xavier Prochaska , Neil H. M. Crighton ,

, 81, 2017-09-20

10 - Implications of z ∼ 6 Quasar Proximity Zones for the Epoch of Reionization and Quasar Lifetimes,The Astrophysical Journal

Anna-Christina Eilers , Frederick B. Davies , Joseph F. Hennawi , J. Xavier Prochaska , Zarija Lukić , Chiara Mazzucchelli ,

, 24, 2017-05-01

11 - Modeling the He ii Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration,The Astrophysical Journal

Tobias M. Schmidt , Joseph F. Hennawi , Gábor Worseck , Frederick B. Davies , Zarija Lukić , Jose Oñorbe ,

, 122, 2018-07-10

12 - Clustering of Lyα Emitters around Quasars at z ∼ 4*,The Astrophysical Journal

Cristina García-Vergara , Joseph F. Hennawi , L. Felipe Barrientos , Fabrizio Arrigoni Battaia ,

, 79, 2019-11-22

13 - CONSTRAINING THE DYNAMICAL IMPORTANCE OF HOT GAS AND RADIATION PRESSURE IN QUASAR OUTFLOWS USING EMISSION LINE RATIOS,The Astrophysical Journal

Jonathan Stern , Claude-André Faucher-Giguère , Nadia L. Zakamska , Joseph F. Hennawi ,

, 130, 2016-03-08

14 - Estimating the Effective Lifetime of the z ∼ 6 Quasar Population from the Composite Proximity Zone Profile,The Astrophysical Journal

Karna A. Morey , Anna-Christina Eilers , Frederick B. Davies , Joseph F. Hennawi , Robert A. Simcoe ,

, 88, 2021-11-01

15 - The Clustering of Submillimeter Galaxies Detected with ALMA,The Astrophysical Journal

Cristina García-Vergara , Jacqueline Hodge , Joseph F. Hennawi , Axel Weiss , Julie Wardlow , Adam D. Myers , Ryan Hickox ,

, 2, 2020-11-01

16 - A UNIVERSAL DENSITY STRUCTURE FOR CIRCUMGALACTIC GAS,The Astrophysical Journal

Jonathan Stern , Joseph F. Hennawi , J. Xavier Prochaska , Jessica K. Werk ,

, 87, 2016-10-14

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