519 citations · 1.9k across the 17 of their papers we have counts for
11 papers · 1 filter
Agnostic Stacking of Intergalactic Doublet Absorption: Measuring the NeVIII Population
Stephan Frank, Matthew M. Pieri, Smita Mathur +2
We present a blind search for doublet intergalactic metal absorption with a method dubbed `agnostic stacking'. Using a forward-modelling framework we combine this with direct detec…
Ultraviolet Emission-Line Correlations in Hubble/COS Spectra of Active Galactic Nuclei: Single-Epoch Black Hole Masses
Evan M. Tilton, J. Michael Shull
Effective methods of measuring supermassive black hole masses in active galactic nuclei (AGN) are of critical importance to studies of galaxy evolution. While there has been much s…
The Escape Fraction of Ionizing Radiation from Galaxies
Andrew Benson, Aparna Venkatesan, J. Michael Shull
The escape of ionizing radiation from galaxies plays a critical role in the evolution of gas in galaxies, and the heating and ionization history of the intergalactic medium. We pre…
The low-redshift intergalactic medium as seen in archival legacy Hubble/STIS and FUSE data
Evan M. Tilton, Charles W. Danforth, J. Michael Shull +1
We present a comprehensive catalog of ultraviolet HST/STIS and FUSE absorbers in the low-redshift IGM at z<0.4. The catalog draws from the extensive literature on IGM absorption, a…
Detecting the warm-hot intergalactic medium through X-ray absorption lines
Yangsen Yao, J. Michael Shull, Q. Daniel Wang +1
The warm-hot intergalactic medium (WHIM) at temperatures 1E5-1E7 K is believed to contain 30-50% of the baryons in the local universe. However, all current X-ray detections of the…
The Baryon Census in a Multiphase Intergalactic Medium: 30% of the Baryons May Still Be Missing
J. Michael Shull, Britton D. Smith, Charles W. Danforth
For low-redshift cosmology and galaxy formation rates, it is important to account for all the baryons synthesized in the Big Bang. Although galaxies and clusters contain 10% of the…
Hubble/COS Observations of the Quasar HE 2347-4342: Probing the Epoch of He II Patchy Reionization at Redshifts z = 2.4-2.9
Michael Shull, Kevin France, Charles Danforth +2
We report ultraviolet spectra of the high-redshift (z_em = 2.9) quasar, HE 2347-4342, taken by the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST). Spectra in…
Cosmic Origins Spectrograph and FUSE Observations of T ~ 10^5 K Gas In A Nearby Galaxy Filament
Anand Narayanan, Bart P. Wakker, Blair D. Savage +4
We present a detection of a broad Ly-alpha absorber (BLA) with a matching O VI line in the nearby universe. The BLA is detected at z = 0.01028 in the high S/N spectrum of Mrk 290 o…
HST/COS Observations of the Ly alpha Forest toward the BL Lac Object 1ES1553+113
Charles W. Danforth, Brian A. Keeney, John T. Stocke +2
We present new far-ultraviolet spectra from the Cosmic Origins Spectrograph (HST/COS) of the BL Lac object 1ES1553+113 covering the wavelength range 1135-1795 A. The data show a sm…
How well do cosmological simulations reproduce individual-halo properties?
M. Trenti, B. D. Smith, E. J. Hallman +2
Cosmological simulations of galaxy formation often rely on prescriptions for star formation and feedback that depend on halo properties such as halo mass, central over-density, and…
Broad HI Absorbers as Metallicity-Independent Tracers of the Warm-Hot Intergalactic Medium
Charles W. Danforth, John T. Stocke, J. Michael Shull
Thermally broadened Ly alpha absorbers (BLAs) offer an alternative method to highly-ionized metal lines for tracing the WHIM. We compile a catalog of reliable BLA candidates along…