Search Publications
A Search for L/T Transition Dwarfs with Pan-STARRS1 and WISE. III. Young L Dwarf Discoveries and Proper Motion Catalogs in Taurus and Scorpius-Centaurus
Magnier, Eugene A.; Chambers, K. C.; Flewelling, H. +13 more
We present the discovery of eight young M7-L2 dwarfs in the Taurus star-forming region and the Scorpius-Centaurus OB Association, serendipitously found during a wide-field search for L/T transition dwarfs using Pan-STARRS1 (optical) and WISE (mid-infrared) photometry. We identify PSO J060.3200+25.9644 (near-infrared spectral type L1) and PSO J077.…
Non-Gaussian Velocity Distributions in Solar Flares from Extreme Ultraviolet Lines: A Possible Diagnostic of Ion Acceleration
Fletcher, Lyndsay; Jeffrey, Natasha L. S.; Labrosse, Nicolas
In a solar flare, a large fraction of the magnetic energy released is converted rapidly to the kinetic energy of non-thermal particles and bulk plasma motion. This will likely result in non-equilibrium particle distributions and turbulent plasma conditions. We investigate this by analyzing the profiles of high temperature extreme ultraviolet emiss…
Stellar Dynamics and Star Formation Histories of z ∼ 1 Radio-loud Galaxies
Bell, Eric F.; Maseda, Michael V.; van Dokkum, Pieter G. +18 more
We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (L 3 GHz > 1023 W Hz-1) at 0.6 < z < 1. This sample is constructed by cross-matching galaxies from the deep VLT/VIMOS LEGA-C spectroscopic survey with the VLA 3 GHz data set. The LEGA-C cont…
The Relationship Between Brightest Cluster Galaxy Star Formation and the Intracluster Medium in CLASH
Donahue, Megan; Moustakas, John; Postman, Marc +2 more
We study the nature of feedback mechanisms in the 11 CLASH brightest cluster galaxies (BCGs) that exhibit extended ultraviolet and nebular line emission features. We estimate star formation rates (SFRs), dust masses, and starburst durations using a Bayesian photometry-fitting technique that accounts for both stellar and dust emission from the UV t…
The First Scattered-light Image of the Debris Disk around the Sco-Cen Target HD 129590
Hinkley, Sasha; Matthews, Elisabeth; Stapelfeldt, Karl +7 more
We present the first scattered-light image of the debris disk around HD 129590, a ∼1.3 M ⊙ G1V member of the Scorpius-Centaurus association with an age of ∼10-16 Myr. The debris disk is imaged with the high contrast imaging instrument SPHERE at the Very Large Telescope, and is revealed by both the IRDIS and IFS subsytems, operating in t…
The Highly Ionized Circumgalactic Medium is Kinematically Uniform around Galaxies
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +3 more
The circumgalactic medium (CGM) traced by O VI λ λ 1031,1037 doublet absorption has been found to concentrate along the projected major and minor axes of the host galaxies. This suggests that O VI traces accreting and outflowing gas, respectively, which are key components of the baryon cycle of galaxies. We investigate this further by examining th…
Galaxy Merger Candidates in High-redshift Cluster Environments
Cooper, M. C.; Demarco, R.; Lidman, C. +14 more
We compile a sample of spectroscopically and photometrically selected cluster galaxies from four high-redshift galaxy clusters (1.59< z< 1.71) from the Spitzer Adaptation of the Red-Sequence Cluster Survey (SpARCS), and a comparison field sample selected from the UKIDSS Deep Survey. Using near-infrared imaging from the Hubble Space Telescope…
ZFIRE: The Evolution of the Stellar Mass Tully-Fisher Relation to Redshift ∼2.2
Kewley, Lisa J.; Kacprzak, Glenn G.; Glazebrook, Karl +8 more
Using observations made with MOSFIRE on Keck I as part of the ZFIRE survey, we present the stellar mass Tully-Fisher relation at 2.0< z< 2.5. The sample was drawn from a stellar-mass-limited, {K}s-band-selected catalog from ZFOURGE over the CANDELS area in the COSMOS field. We model the shear of the Hα emission line to derive rota…
Onset of a Large Ejective Solar Eruption from a Typical Coronal-jet-base Field Configuration
Moon, Yong-Jae; Joshi, Navin Chandra; Magara, Tetsuya +2 more
Utilizing multiwavelength observations and magnetic field data from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), SDO/Helioseismic and Magnetic Imager (HMI), the Geostationary Operational Environmental Satellite (GOES), and RHESSI, we investigate a large-scale ejective solar eruption of 2014 December 18 from active regio…
Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745
Rigby, Jane R.; Whitaker, Katherine E.; Sharon, Keren +7 more
SDSS J2222+2745 is a galaxy cluster at z = 0.49, strongly lensing a quasar at z = 2.805 into six widely separated images. In recent Hubble Space Telescope imaging of the field, we identify additional multiply lensed galaxies and confirm the sixth quasar image that was identified by Dahle et al. We used the Gemini-North telescope to measure a spect…