Browsing by Keyword "ISM: molecules"

Now showing items 21-29 of 29

    • Misalignment of Outflow Axes in the Proto-Multiple Systems in Perseus 

      Lee, Katherine I.; Dunham, Michael M.; Myers, Philip C.; Arce, Héctor G.; Bourke, Tyler L.; Goodman, Alyssa; Jørgensen, Jes K.; Kristensen, Lars E.; Offner, Stella S. R.; Pineda, Jaime; Tobin, John J.; Vorobyov, Eduard I. (American Astronomical Society, 2016)
      We investigate the alignment between outflow axes in nine of the youngest binary/multiple systems in the Perseus Molecular Cloud. These systems have typical member spacing larger than 1000 au. For outflow identification, ...

    • Outflow 20–2000 AU from a High‐Mass Protostar in W51‐IRS 2 

      Eisner, J. A.; Greenhill, Lincoln Jared; Herrnstein, J. R.; Moran, James M.; Menten, K. M. (IOP Publishing, 2002)
      We present the results of the first high angular resolution observations of SiO maser emission towards the star forming region W51-IRS2 made with the Very Large Array (VLA) and Very Long Baseline Array (VLBA). Our images ...

    • The Perils of Clumpfind: The Mass Spectrum of Substructures in Molecular Clouds 

      Pineda, Jaime Eduardo; Rosolowsky, Erik W.; Goodman, Alyssa (American Astronomical Society, 2009)
      We study the mass spectrum of substructures in the Perseus Molecular Cloud Complex traced by \(^{13}CO(1–0)\), finding that \(dN/dM \ \alpha \ M^{−2.4}\) for the standard Clumpfind parameters. This result does not agree ...

    • Rotational and Vibrational Excitation of CO Molecules by Collisions with 4 He Atoms 

      Cecchi‐Pestellini, Cesare; Bodo, Enrico; Balakrishnan, N.; Dalgarno, Alexander (IOP Publishing, 2002)
      Full close-coupled calculations are carried out of the cross sections for energy transfer between rotational levels of carbon monoxide in collision with 4He atoms with energies between 5 and 600 cm-1. At low energies, the ...

    • A Search for H 2 O Maser Emission in Southern Active Galactic Nuclei and Star‐forming Galaxies: Discovery of a Maser in the Edge‐on Galaxy IRAS F01063?8034 

      Greenhill, Lincoln Jared; Ellingsen, S.; Norris, R.; McGregor, P.; Gough, R.; Sinclair, M.; Rayner, D.; Phillips, C.; Herrnstein, J.; Moran, James M. (IOP Publishing, 2002)
      We report the cumulative results of five surveys for H2O maser emission at 1.35 cm wavelength in 131 active galactic nuclei (AGNs) and star-forming galaxies, conducted at the Parkes Observatory between 1993 and 1998. We ...

    • 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 ...

    • The "True" Column Density Distribution in Star-Forming Molecular Clouds 

      Goodman, Alyssa; Pineda, Jaime Eduardo; Schnee, Scott (American Astronomical Society, 2009)
      We use the COMPLETE Survey's observations of the Perseus star-forming region to assess and intercompare the three methods used for measuring column density in molecular clouds: near-infrared (NIR) extinction mapping; thermal ...

    • A Uniform Catalog of Molecular Clouds in the Milky Way 

      Rice, Thomas S.; Goodman, Alyssa; Bergin, Edwin A.; Beaumont, Christopher; Dame, Thomas M. (American Astronomical Society, 2016)
      The all-Galaxy CO survey of Dame, Hartmann, & Thaddeus (2001) is by far the most uniform, large-scale Galactic CO survey. Using a dendrogram-based decomposition of this survey, we present a catalog of 1064 massive molecular ...

    • A Warped Accretion Disk and Wide‐Angle Outflow in the Inner Parsec of the Circinus Galaxy 

      Greenhill, Lincoln Jared; Booth, R. S.; Ellingsen, S. P.; Herrnstein, J. R.; Jauncey, D. L.; McCulloch, P. M.; Moran, James M.; Norris, R. P.; Reynolds, J. E.; Tzioumis, A. K. (IOP Publishing, 2003)
      We present the first VLBI maps of H2O maser emission (λ1.3 cm) in the nucleus of the Circinus Galaxy, constructed from data obtained with the Australia Telescope Long Baseline Array. The maser emission traces a warped, ...