Journal: The Astrophysical Journal

  • Publication
    The Nature of Close Companions of the BL Lacertae Objects 1ES 0502+675 and 1ES 1440+122
    We report on deep radio images and optical spectroscopy of two BL Lac objects that have very close compact companions. The two targets, 1ES 0502+675 and 1ES...
  • Publication
    The Nature of Dust in Compact Galactic Planetary Nebulae from Spitzer Spectra
    We present the Spitzer/Infrared Spectrograph (IRS) spectra of 157 compact Galactic planetary nebulae (PNe). These young PNe provide insight on the effects of...
  • Publication
    The Nature of Starbursts. I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies
    We use archival Hubble Space Telescope observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf...
  • Publication
    The Nature of Starbursts. II. The Duration of Starbursts in Dwarf Galaxies
    The starburst phenomenon can shape the evolution of the host galaxy and the surrounding intergalactic medium. The extent of the evolutionary impact is partly...
  • Publication
    The Nature of the Nuclear H2O Masers of NGC 1068: Reverberation and Evidence for a Rotating Disk Geometry
    We report new (1995) Very Large Array (VLA) observations and (1984-1999) Effelsberg 100 m monitoring observations of the 22 GHz H2O maser spectrum of the...
  • Publication
    The Nature of the UV/Optical Emission of the Ultraluminous X-Ray Source in Holmberg II
    We report on UV and X-ray spectroscopy and broadband optical observations of the ultraluminous X-ray source in Holmberg II. Fitting various stellar spectral...
  • Publication
    The Nature of Ultraluminous X-Ray Sources
    We present spectroscopic observations of six optical counterparts of ultraluminous X-ray sources (ULXs) around nearby galaxies. The spectra of the six objects...
  • Publication
    The Near-Infrared Ca II Triplet-σ Relation for Bulges of Spiral Galaxies
    We present measurements of the near-infrared Ca II triplet (CaT, CaT*), Paschen (PaT), and magnesium (Mg I) indices for a well-studied sample of 19 bulges of...
  • Publication
    The Near-infrared Coronal Line Spectrum of 54 nearby Active Galactic Nuclei
    The relationship between the emission of coronal lines (CLs) and nuclear activity in 36 Type 1 and 18 Type 2 active galactic nuclei (AGNs) is analyzed, for the...