Search Publications
The Bright-end Galaxy Candidates at z ∼ 9 from 79 Independent HST Fields
Shull, J. M.; Treu, T.; Mason, C. A. +11 more
We present a full data analysis of the pure-parallel Hubble Space Telescope (HST) imaging observations in the Brightest of Reionizing Galaxies Survey (BoRG[z9]) in Cycle 22. The medium-deep exposures with five HST/WFC3IR+UVIS filter bands from 79 independent sightlines (∼370 arcmin2) provide the least biased determination of number dens…
Precise Time Delays from Strongly Gravitationally Lensed Type Ia Supernovae with Chromatically Microlensed Images
Nugent, Peter E.; Collett, Thomas E.; Goldstein, Daniel A. +1 more
Time delays between the multiple images of strongly gravitationally lensed Type Ia supernovae (glSNe Ia) have the potential to deliver precise cosmological constraints, but the effects of microlensing on time delay extraction have not been studied in detail. Here we quantify the effect of microlensing on the glSN Ia yield of the Large Synoptic Sur…
The Complex Morphology of the Young Disk MWC 758: Spirals and Dust Clumps around a Large Cavity
Tang, Ya-Wen; Ricci, L.; Benisty, M. +7 more
We present Atacama Large Millimeter Array observations at an angular resolution of 0.″1-0.″2 of the disk surrounding the young Herbig Ae star MWC 758. The data consist of images of the dust continuum emission recorded at 0.88 millimeter, as well as images of the 13CO and C18O J = 3-2 emission lines. The dust continuum emissio…
Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. I. Spatially Resolved Mass Outflow Rates for the Seyfert 2 Galaxy Markarian 573
Kraemer, S. B.; Crenshaw, D. M.; Schmitt, H. R. +3 more
We present the first spatially resolved mass outflow rate measurements ({\dot{M}}out}) of the optical emission line gas in the narrow line region (NLR) of a Seyfert 2 galaxy, Markarian 573. Using long slit spectra and [O III] imaging from the Hubble Space Telescope and Apache Point Observatory in conjunction with emission line diagnosti…
An Unusual Energetic Particle Flux Enhancement Associated with Solar Wind Magnetic Island Dynamics
Chen, Y.; Zank, G. P.; Zhao, L. -L. +4 more
The possibility that charged particles are accelerated statistically in a “sea” of small-scale interacting magnetic flux ropes in the supersonic solar wind is gaining credence. In this Letter, we extend the Zank et al. statistical transport theory for a nearly isotopic particle distribution by including an escape term corresponding to particle los…
A New Look at an Old Cluster: The Membership, Rotation, and Magnetic Activity of Low-mass Stars in the 1.3 Gyr Old Open Cluster NGC 752
Kraus, A.; Bochanski, J. J.; Covey, K. R. +8 more
The nearby open cluster NGC 752 presents a rare opportunity to study stellar properties at ages >1 Gyr. However, constructing a membership catalog for it is challenging; most surveys have been limited to identifying its giants and dwarf members earlier than mid-K. We supplement past membership catalogs with candidates selected with updated phot…
Hidden in Plain Sight: A Massive, Dusty Starburst in a Galaxy Protocluster at z = 5.7 in the COSMOS Field
Schinnerer, Eva; Scoville, Nick; Carilli, Christopher L. +7 more
We report the serendipitous discovery of a dusty, starbursting galaxy at z = 5.667 (hereafter called CRLE) in close physical association with the “normal” main-sequence galaxy HZ10 at z = 5.654. CRLE was identified by detection of [C II], [N II], and CO(2-1) line emission, making it the highest-redshift, most luminous starburst in the COSMOS field…
Absolute Hubble Space Telescope Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass
van der Marel, Roeland P.; Watkins, Laura L.; Bellini, Andrea +4 more
We present Hubble Space Telescope (HST) absolute proper motion (PM) measurements for 20 globular clusters (GCs) in the Milky Way (MW) halo at Galactocentric distances {R}GC}≈ 10{--}100 kpc, with a median per-coordinate PM uncertainty of 0.06 {mas} {yr}}-1. Young and old halo GCs do not show systematic differences in their 3D …
The First Tidally Disrupted Ultra-faint Dwarf Galaxy?: A Spectroscopic Analysis of the Tucana III Stream
Bechtol, K.; Smith, M.; D'Andrea, C. B. +69 more
We present a spectroscopic study of the tidal tails and core of the Milky Way satellite Tucana III, collectively referred to as the Tucana III stream, using the 2dF+AAOmega spectrograph on the Anglo-Australian Telescope and the IMACS spectrograph on the Magellan Baade Telescope. In addition to recovering the brightest nine previously known member …
Spiral Arms in Disks: Planets or Gravitational Instability?
Dong, Ruobing; Najita, Joan R.; Brittain, Sean
Spiral arm structures seen in scattered-light observations of protoplanetary disks can potentially serve as signposts of planetary companions. They can also lend unique insights into disk masses, which are critical in setting the mass budget for planet formation but are difficult to determine directly. A surprisingly high fraction of disks that ha…