Search Publications
Models of the η Corvi Debris Disk from the Keck Interferometer, Spitzer, and Herschel
Bryden, G.; Lebreton, J.; Boccaletti, A. +4 more
Debris disks are signposts of analogs to small-body populations of the solar system, often, however, with much higher masses and dust production rates. The disk associated with the nearby star η Crv is especially striking, as it shows strong mid- and far-infrared excesses despite an age of ∼1.4 Gyr. We undertake constructing a consistent model of …
ZFIRE: The Kinematics of Star-forming Galaxies as a Function of Environment at z ∼ 2
Kewley, Lisa J.; Allen, Rebecca J.; Kacprzak, Glenn G. +12 more
We perform a kinematic analysis of galaxies at z ∼ 2 in the COSMOS legacy field using near-infrared (NIR) spectroscopy from Keck/MOSFIRE as part of the ZFIRE survey. Our sample consists of 75 Ks-band selected star-forming galaxies from the ZFOURGE survey with stellar masses ranging from log(M ⋆/M ⊙) = 9.0-11.0, 28 of which ar…
Solar Jet-Coronal Hole Collision and a Closely Related Coronal Mass Ejection
Chen, Yao; Zheng, Ruisheng; Du, Guohui +1 more
Jets are defined as impulsive, well-collimated upflows, occurring in different layers of the solar atmosphere with different scales. Their relationship with coronal mass ejections (CMEs), another type of solar impulsive events, remains elusive. Using high-quality imaging data from the Atmospheric Imaging Assembly/Solar Dynamics Observatory, we sho…
Empirically Estimated Far-UV Extinction Curves for Classical T Tauri Stars
France, Kevin; Brown, Alex; Herczeg, Gregory +3 more
Measurements of extinction curves toward young stars are essential for calculating the intrinsic stellar spectrophotometric radiation. This flux determines the chemical properties and evolution of the circumstellar region, including the environment in which planets form. We develop a new technique using H2 emission lines pumped by stell…
New Spectroscopic Technique Based on Coaddition of Surface Brightness Fluctuations: NGC 4449 and its Stellar Tidal Stream
Romanowsky, Aaron J.; Brodie, Jean P.; Arnold, Jacob A. +5 more
We present a new spectroscopic technique based in part on targeting the upward fluctuations of the surface brightness for studying the internal stellar kinematics and metallicities of galaxies of low surface brightness effects both to galaxies and streams beyond the Local Group. The distance to these systems makes them unsuitable for targeting ind…
Venus Cloud Morphology and Motions from Ground-based Images at the Time of the Akatsuki Orbit Insertion
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +7 more
We report Venus image observations around the two maximum elongations of the planet at 2015 June and October. From these images we describe the global atmospheric dynamics and cloud morphology in the planet before the arrival of JAXA’s Akatsuki mission on 2015 December 7. The majority of the images were acquired at ultraviolet wavelengths (380-410…
The Gini Coefficient as a Tool for Image Family Idenitification in Strong Lensing Systems with Multiple Images
Sharon, Keren; Florian, Michael K.; Gladders, Michael D. +1 more
The sample of cosmological strong lensing systems has been steadily growing in recent years and with the advent of the next generation of space-based survey telescopes, the sample will reach into the thousands. The accuracy of strong lens models relies on robust identification of multiple image families of lensed galaxies. For the most massive len…
Dynamics of a Prominence-horn Structure during Its Evaporation in the Solar Corona
Liu, Wei; Li, Xing; Chen, Yao +3 more
The physical connections among and formation mechanisms of various components of the prominence-horn cavity system remain elusive. Here we present observations of such a system, focusing on a section of the prominence that rises and separates gradually from the main body. This forms a configuration sufficiently simple to yield clues regarding the …
Star Formation in Intermediate Redshift 0.2 < z < 0.7 Brightest Cluster Galaxies
Baum, Stefi A.; O'Dea, Christopher P.; Cooke, Kevin C. +3 more
We present a multi-wavelength photometric and spectroscopic study of 42 Brightest Cluster Galaxies (BCGs) in two samples of galaxy clusters chosen for a gravitational lensing study. The study’s initial sample combines 25 BCGs from the Cluster Lensing and Supernova Survey with Hubble sample and 37 BCGs from the Sloan Giant Arcs Survey with a total …
The Environment of z > 1 3CR Radio Galaxies and QSOs: From Proto-clusters to Clusters of Galaxies?
Macchetto, F. D.; Capetti, A.; Sparks, W. B. +8 more
We study the cluster environment for a sample of 21 radio loud active galactic nuclei from the 3CR catalog at z\gt 1, 12 radio galaxies (RGs) and nine quasars, with Hubble Space Telescope (HST) images in the optical and IR. We use two different approaches to determine cluster candidates. We identify the early-type galaxies (ETGs) in every field by…