,F =2→1) toward three Galactic supernova remnants: W 28, (2009)
M. J Claussen, D. A. Frail, W. M. Goss, R. A. Gaume, Mhz Π
We present arcsecond resolution observations from the VLA1 with full Stokes polarimetry of the ground-state satellite line of the hydroxyl molecule (OH) at 1720.53
A Precise Distance to IRAS 00420+5530 via H2O Maser Parallax with the VLBA (2009)
Moellenbrock, G. A., Claussen, M. J., Goss, W. M.
We have used the VLBA to measure the annual parallax of the H2O masers in the star-forming region IRAS 00420+5530. This measurement yields a direct distance estimate of 2.17 +/- 0.05 kpc (
The Motion of Water Masers in the Pre-Planetary Nebula IRAS 16342-3814 (2008)
Claussen, M. J, Sahai, R., Morris, M. R.
We present high angular resolution observations, using the Very Long Baseline Array (VLBA) of the NRAO, of the high-velocity water masers toward the "water-fountain" pre-planetary nebula, IRAS...
An Inner Hole in the Disk around TW Hydrae Resolved in 7 Millimeter Dust Emission (2007)
Hughes, A. M., Wilner, D. J., Calvet, N., D'Alessio, P., Claussen, M. J., Hogerheijde, M. R.
We present Very Large Array observations at 7 millimeters wavelength that resolve the dust emission structure in the disk around the young star TW Hydrae at the scale of the ~4 AU (~0.16") radius...
VLA+PT Astrometry of 46 Radio Stars (2006)
Boboltz, D. A., Fey, A. L., Puatua, W. K., Zacharias, N., Claussen, M. J., Johnston, K. J., ...
We have used the Very Large Array (VLA), linked with the Pie Town Very Long Baseline Array antenna, to determine astrometric positions of 46 radio stars in the International Celestial Reference Frame...
Radio continuum monitoring of the extreme carbon star IRC+10216 (2006)
Menten, K. M., Reid, M. J., Kruegel, E., Claussen, M. J., Sahai, R.
We describe Very Large Array observations of the extreme carbon star IRC+10216 at 8.4, 14.9, and 22.5 GHz made over a two year period. We find possible variability correlated with the infrared phase...
Towards Planetesimals in the Disk around TW Hya: 3.5 centimeter Dust Emission (2005)
Wilner, D. J., D'Alessio, P., Calvet, N., Claussen, M. J., Hartmann, L.
We present Very Large Array observations at 3.5 cm of the nearby young star TW Hya that show the emission is constant in time over weeks, months and years, and spatially resolved with peak brightness...
The OH (1720 MHz) Supernova Remnant Masers in W44: MERLIN and VLBA Polarization Observations (2005)
Hoffman, Ian M., Goss, W. M., Brogan, C. L., Claussen, M. J.
Full-polarization MERLIN and VLBA observations of the 1720-MHz maser emission from the OH molecule in the supernova remnant W44 are presented. Zeeman splitting has been directly resolved between...
High resolution radio observations of the colliding-wind binary WR140 (2005)
Dougherty, S. M., Beasley, A. J., Claussen, M. J., Zauderer, B. A., Bolingbroke, N. J.
Milli-arcsecond resolution Very Long Baseline Array (VLBA) observations of the archetype WR+O star colliding-wind binary (CWB) system WR140 are presented for 23 epochs between orbital phases 0.74 and...
S. M. Dougherty, A. J. Beasley, M. J. Claussen, B. A. Zauderer
Milli-arcsecond resolution Very Long Baseline Array (VLBA) observations of the archetype WR+O star colliding-wind binary (CWB) system WR 140 are presented for 23 epochs between orbital phases 0.74...
The OH (1720 MHz) Supernova Remnant Masers in W28: MERLIN and VLBA Polarization Observations (2004)
Hoffman, Ian M., Goss, W. M., Brogan, C. L., Claussen, M. J.
Full-polarization MERLIN and VLBA observations of the 1720 MHz maser emission from the OH molecule in the supernova remnant W28 are presented. Zeeman splitting (|B| \approx 0.75 mG) has been directly...
Radio emission from WR140 (2004)
Dougherty, S. M., Beasley, A. J., Claussen, M. J., Zauderer, B. A., Bolingbroke, N. J.
Milliarcsecond resolution Very Long Baseline Array (VLBA) observations of the archetype WR+O star colliding-wind binary (CWB) system WR140 have been obtained at 23 epochs between orbital phases 0.74...
Ground-State SiO Maser Emission Toward Evolved Stars (2004)
Boboltz, D. A., Claussen, M. J.
We have made the first unambiguous detection of vibrational ground-state maser emission from SiO toward six evolved stars. Using the Very Large Array, we simultaneously observed the v=0, J=1-0,...
Astrometric Positions and Proper Motions of 19 Radio Stars (2003)
Boboltz, D. A., Fey, A. L., Johnston, K. J., Claussen, M. J., De Vegt, C., Zacharias, N., ...
We have used the Very Large Array, linked with the Pie Town Very Long Baseline Array antenna, to determine astrometric positions of 19 radio stars in the International Celestial Reference Frame...
Astrometric Positions and Proper Motions of 19 Radio Stars (2003)
Boboltz, D. A., Fey, A. L., Johnston, K. J., Claussen, M. J., De Vegt, C.
We have used the Very Large Army linked with the Pie Town Very Long Baseline Array antenna to determine astrometric positions of 19 radio stars in the International Celestial Reference Frame (ICRF)....
The Sizes of OH (1720 MHz) Supernova Remnant Masers: MERLIN and VLBA Observations of IC443 (2002)
Hoffman, Ian M., Goss, W. M., Brogan, C. L., Claussen, M. J, Richards, A. M. S.
MERLIN and VLBA observations of the 1720 MHz maser emission from the OH molecule in the supernova remnant IC443 are presented. Based on MERLIN data with a resolution of 160 mas, the deconvolved sizes...
Claussen, M. J., Goss, W. M., Desai, K. M., Brogan, C. L.
We have used the NRAO Very Large Array (VLA) in conjunction with the Very Long Baseline Array (VLBA) Pie Town antenna as a real-time interferometer system to measure the size of the extragalactic...
Gallimore, J. F., Henkel, C., Baum, S. A., Glass, I. S., Claussen, M. J., Prieto, M. A., ...
We report new (1995) Very Large Array observations and (1984 - 1999) Effelsberg 100m monitoring observations of the 22 GHz H2O maser spectrum of the Seyfert 2 galaxy NGC 1068. The sensitive VLA...
The Extreme Scattering Event Toward 1741-038: H I Absorption (2000)
Lazio, T. J. W., Gaume, R. A., Claussen, M. J.
We report multi-epoch VLA H I absorption observations of the source 1741-038 (OT-068) before and during an extreme scattering event (ESE). Observations at four epochs, three during the ESE, were...
Claussen, M. J., Goss, W. M., Frail, D. A., Desai, K.
We have used the NRAO Very Long Baseline Array (VLBA) to image OH(1720 MHz) masers in the supernova remnants W28 and W44 at a resolution of 40 mas. We also used MERLIN to observe the same OH(1720...
Ground-State SiO Maser Emission Toward Evolved Stars (1998)
Boboltz, D. A., Claussen, M. J.
We have made the first unambiguous detection of vibrational ground-state maser emission from 28SiO toward six evolved stars. Using the Very Large Array, we simultaneously observed the v = 0,J = 1-0,...
Koralesky, Barron, Frail, D. A., Goss, W. M., Claussen, M. J., Green, A. J.
We present the results of VLA observations in the ground-state hydroxyl (OH) transition at 1720 MHz toward 20 supernova remnants (SNRs). We detect compact emission from four objects. For three of...
Claussen, M. J, Frail, D. A., Goss, W. M., Gaume, R. A.
(abridged) - We present arcsecond resolution observations from the VLA of the satellite line of the hydroxyl molecule (OH) at 1720.53 MHz toward three Galactic supernova remnants: W28, W44 and IC443....