Journal: The Astrophysical Journal

  • Publication
    The ACS Survey of Galactic Globular Clusters. VII. Relative Ages
    The ACS Survey of Galactic globular clusters is a Hubble Space Telescope Treasury program designed to provide a new large, deep, and homogeneous photometric...
  • Publication
    The ACS Survey of Galactic Globular Clusters. XI. The Three-dimensional Orientation of the Sagittarius Dwarf Spheroidal Galaxy and Its Globular Clusters
    We use observations from the Hubble Space Telescope Advanced Camera for Surveys (HST/ACS) study of Galactic globular clusters to investigate the spatial...
  • Publication
    The ACS Survey of Galactic Globular Clusters: M54 and Young Populations in the Sagittarius Dwarf Spheroidal Galaxy
    As part of the ACS Survey of Galactic Globular Clusters, we present new Hubble Space Telescope photometry of the massive globular cluster M54 (NGC 6715) and the...
  • Publication
    The Active Jet in NGC 4258 and Its Associated Shocks
    We present images and spectra of the active jet and anomalous arms on subparsec through kiloparsec scales in the LINER/Seyfert galaxy NGC 4258 (M106). New VLBA...
  • Publication
    The Afterglows of Swift-era Gamma-ray Bursts. I. Comparing pre-Swift and Swift-era Long/Soft (Type II) GRB Optical Afterglows
    We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to 2009 September...
  • Publication
    The Afterglows of Swift-era Gamma-Ray Bursts. II. Type I GRB versus Type II GRB Optical Afterglows
    Gamma-ray bursts (GRBs) have been separated into two classes, originally along the lines of duration and spectral properties, called "short/hard" and "long/soft...
  • Publication
    The Ages of 55 Globular Clusters as Determined Using an Improved \Delta V^HB_TO Method along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
    Ages have been derived for 55 globular clusters (GCs) for which Hubble Space Telescope Advanced Camera for Surveys photometry is publicly available. For most of...
  • Publication
    The ALHAMBRA Survey: Evolution of Galaxy Spectral Segregation
    We study the clustering of galaxies as a function of spectral type and redshift in the range 0.35 z 1.1 using data from the Advanced Large Homogeneous Area...
  • Publication
    The Aligned Orbit of a Hot Jupiter around the M Dwarf TOI-4201
    Measuring the obliquities of stars hosting giant planets may shed light on the dynamical history of planetary systems. Significant efforts have been made to...