Browsing by Author "Reid, Mark"

Now showing items 1-10 of 10

    • An Astrometric Search for a Sub-stellar Companion of the M8.5 Dwarf TVLM 513–46546 Using Very Long Baseline Interferometry 

      Forbrich, Jan; Berger, Edo; Reid, Mark Jonathan (IOP Publishing, 2013)
      We conducted multi-epoch VLBI observations to search for astrometric reflex motion caused by a sub-stellar companion of the M8.5 dwarf TVLM 513–46546. The observations yield an absolute parallax corresponding to a distance ...

    • High-Precision Radio and Infrared Astrometry of Lspm J1314+1320ab. I. Parallax, Proper Motions, and Limits on Planets 

      Forbrich, Jan; Dupuy, Trent J.; Reid, Mark Jonathan; Berger, Edo; Rizzuto, Aaron; Mann, Andrew W.; Liu, Michael C.; Aller, Kimberly; Kraus, Adam L. (American Astronomical Society, 2016)
      We present multi-epoch astrometric radio observations with the Very Long Baseline Array (VLBA) of the young ultracool-dwarf binary LSPM J1314+1320AB . The radio emission comes from the secondary star. Combining the VLBA ...

    • The IC 133 Water Vapor Maser in the Galaxy M33: A Geometric Distance 

      Argon, A; Greenhill, Lincoln Jared; Moran, James M.; Reid, Mark Jonathan; Menten, K. M.; Inoue, M. (IOP Publishing, 2004)
      We report on the results of a 14 year long VLBI study of proper motions in the IC 133 H2O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the 3-dimensional structure and dynamics of ...

    • Line Imaging of Orion KL at 865 μm with the Submillimeter Array 

      Beuther, H.; Zhang, Qizhou; Greenhill, Lincoln Jared; Reid, Mark Jonathan; Wilner, David J.; Keto, Eric R.; Shinnaga, H.; Ho, P. T. P.; Moran, James M.; Liu, S.‐Y.; Chang, Chih-Wei (IOP Publishing, 2005)
      We present the first submm (865 µm) imaging spectral line survey at one arcsecond resolution conducted with the Submillimeter Array toward Orion-KL. Within the two × two GHz bandpasses (lower and upper sidebands, 337.2–339.2GHz ...

    • The structure of the accretion disk in NGC 4258 

      Moran, James M.; Humphreys, Elizabeth; Greenhill, Lincoln Jared; Reid, Mark Jonathan; Argon, Alice (Cambridge University Press (CUP), 2007)
      A wealth of new information about the structure of the maser disk in NGC 4258 has been obtained from a series of 18 VLBA observations spanning three years, as well as from 32 additional epochs of spectral monitoring data ...

    • Subarcsecond Submillimeter Continuum Observations of Orion KL 

      Beuther, H.; Zhang, Qizhou; Greenhill, Lincoln Jared; Reid, Mark Jonathan; Wilner, David J.; Keto, Eric R.; Marrone, D.; Ho, P. T. P.; Moran, James M.; Rao, R.; Shinnaga, H.; Liu, S.-Y. (IOP Publishing, 2004)
      We present the first 865 µm continuum image with sub-arcsecond resolution obtained with the Submillimeter Array. These data resolve the Orion-KL region into the hot core, the nearby radio source I, the sub-mm counterpart ...

    • Submillimeter Array 440 μm/690 GHz Line and Continuum Observations of Orion KL 

      Beuther, H.; Zhang, Qizhou; Reid, Mark Jonathan; Hunter, T. R.; Gurwell, Mark Andrew; Wilner, David J.; Zhao, Jun-Hui; Shinnaga, H.; Keto, Eric R.; Ho, P. T. P.; Moran, James M.; Liu, S.‐Y. (IOP Publishing, 2006)
      Submillimeter Array observations of Orion-KL at ∼ 1′′ resolution in the 440 µm/690 GHz band reveal new insights about the continuum and line emission of the region. The 440 µm continuum flux density measurement from source ...

    • Toward a New Geometric Distance to the Active Galaxy NGC 4258. I. VLBI Monitoring of Water Maser Emission 

      Argon, A; Greenhill, Lincoln Jared; Reid, Mark Jonathan; Moran, James M.; Humphreys, E. M. L. (IOP Publishing, 2007)
      We report a three year, 18 epoch, VLBI monitoring study of H 2O masers in the sub-parsec, warped, accretion disk within the NGC 4258 AGN. Our immediate goals are to trace the geometry of the underlying disk, track rotation ...

    • Toward a New Geometric Distance to the Active Galaxy NGC 4258. II. Centripetal Accelerations and Investigation of Spiral Structure 

      Humphreys, E. M. L.; Reid, Mark Jonathan; Greenhill, Lincoln J.; Moran, James M.; Argon, Alice L. (American Astronomical Society, 2008)
      We report measurements of centripetal accelerations of maser spectral components of NGC 4258 for 51 epochs spanning 1994 to 2004. This is the second paper of a series, in which the goal is the determination of a new geometric ...

    • Toward a New Geometric Distance To the Active Galaxy NGC 4258. III. Final Results and The Hubble Constant 

      Humphreys, E. M. L.; Reid, Mark Jonathan; Moran, James M.; Greenhill, Lincoln Jared; Argon, Alice L. (American Astronomical Society, 2013)
      We report a new geometric maser distance estimate to the active galaxy NGC 4258. The data for the new model are maser line-of-sight (LOS) velocities and sky positions from 18 epochs of very long baseline interferometry ...