Search Publications
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the Most Luminous Galaxy in the Universe
Stern, D.; Wu, J.; Aravena, M. +6 more
Observed at z = 4.601 and with Lbol = 3.5 × 1014 L⊙ , W2246-0526 is the most luminous galaxy known in the universe and hosts a deeply buried active galactic nucleus (AGN)/supermassive black hole (SMBH). Discovered using the Wide-field Infrared Survey Explorer, W2246-0526 is classified as a hot dust-obscured galaxy,…
Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744
Massey, Richard; Umetsu, Keiichi; Medezinski, Elinor +5 more
We present a weak-lensing analysis of the merging Frontier Fields (FF) cluster Abell 2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously modeling the two-dimensional reduced shear field using a combination of a Navarro-Frenk-White (NFW)…
Cloud Atlas: Discovery of Patchy Clouds and High-amplitude Rotational Modulations in a Young, Extremely Red L-type Brown Dwarf
Schneider, Glenn; Cowan, Nicolas B.; Burgasser, Adam J. +10 more
Condensate clouds fundamentally impact the atmospheric structure and spectra of exoplanets and brown dwarfs, but the connections between surface gravity, cloud structure, dust in the upper atmosphere, and the red colors of some brown dwarfs remain poorly understood. Rotational modulations enable the study of different clouds in the same atmosphere…
Chandra Observes the End of an Era in SN 1987A
Zhekov, Svetozar A.; Dwek, Eli; Park, Sangwook +3 more
Updated imaging and photometric results from Chandra observations of SN 1987A, covering the last 16 years, are presented. We find that the 0.5-2 keV light curve has remained constant at ∼8 × 10-12 erg s-1 cm-2 since 9500 days, with the 3-8 keV light curve continuing to increase until at least 10,000 days. The expan…
HST Hot-Jupiter Transmission Spectral Survey: Clear Skies for Cool Saturn WASP-39b
Deming, Drake; Nikolov, Nikolay; Fortney, Jonathan J. +13 more
We present the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) optical transmission spectroscopy of the cool Saturn-mass exoplanet WASP-39b from 0.29-1.025 µm, along with complementary transit observations from Spitzer IRAC at 3.6 and 4.5 µm. The low density and large atmospheric pressure scale height of WASP-3…
The Major Geoeffective Solar Eruptions of 2012 March 7: Comprehensive Sun-to-Earth Analysis
Gontikakis, C.; Patsourakos, S.; Tsinganos, K. +33 more
During the interval 2012 March 7-11 the geospace experienced a barrage of intense space weather phenomena including the second largest geomagnetic storm of solar cycle 24 so far. Significant ultra-low-frequency wave enhancements and relativistic-electron dropouts in the radiation belts, as well as strong energetic-electron injection events in the …
The Evolution of the Intracluster Medium Metallicity in Sunyaev Zel’dovich-selected Galaxy Clusters at 0 < z < 1.5
Hlavacek-Larrondo, J.; Bleem, L. E.; Stalder, B. +16 more
We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 < z < 1.5, were drawn from a larger, mass-selected sample of galaxy clusters discovered in the 2500 square degree South Pole Telescope Sunyaev Zel’dovich (SPT-SZ) survey.…
The Relationship Between Molecular Gas, H I, and Star Formation in the Low-mass, Low-metallicity Magellanic Clouds
Bot, Caroline; Bolatto, Alberto D.; Leroy, Adam K. +14 more
The Magellanic Clouds provide the only laboratory to study the effects of metallicity and galaxy mass on molecular gas and star formation at high (∼⃒20 pc) resolution. We use the dust emission from HERITAGE Herschel data to map the molecular gas in the Magellanic Clouds, avoiding the known biases of CO emission as a tracer of {{{H}}}2. U…
Subproton-scale Cascades in Solar Wind Turbulence: Driven Hybrid-kinetic Simulations
Rincon, F.; Califano, F.; Cerri, S. S. +2 more
A long-lasting debate in space plasma physics concerns the nature of subproton-scale fluctuations in solar wind (SW) turbulence. Over the past decade, a series of theoretical and observational studies were presented in favor of either kinetic Alfvén wave (KAW) or whistler turbulence. Here, we investigate numerically the nature of the subproton-sca…
The Lyman Continuum Escape Fraction of the Cosmic Horseshoe: A Test of Indirect Estimates
Lewis, Geraint F.; Pettini, Max; Siana, Brian +6 more
High-redshift star-forming galaxies are likely responsible for the reionization of the universe, yet direct detection of their escaping ionizing (Lyman continuum [LyC]) photons has proven to be extremely challenging. In this study, we search for escaping LyC of the Cosmic Horseshoe, a gravitationally lensed, star-forming galaxy at z = 2.38 with a …