Ground-Based Astrometry 2010-2020 (2009)
Henry, Todd J., Monet, David G., Shankland, Paul D., Reid, Mark J., Van Altena, William, Zacharias, Norbert
We discuss the opportunities for astronomical discovery via ground-based astrometry carried out in the United States during the 2010-2020 decade. We describe imminent scientific breakthroughs that...
Is there a Supermassive Black Hole at the Center of the Milky Way? (2008)
This review outlines the observations that now provide an overwhelming scientific case that the center of our Milky Way Galaxy harbors a supermassive black hole. Observations at infrared wavelength...
Limits on the Position Wander of Sgr A* (2008)
Reid, Mark J., Broderick, Avery E., Loeb, Abraham, Honma, Mareki, Brunthaler, Andreas
We present measurements with the VLBA of the variability in the centroid position of Sgr A* relative to a background quasar at 7-mm wavelength. We find an average centroid wander of 71 +/- 45...
The special problems encountered when performing spectral-line VLBI observations are discussed in this Chapter. In particular, the usefulness of Fourier transforming measured visibility data with...
A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region (2007)
Forbrich, Jan, Menten, Karl M., Reid, Mark J.
Aims: Our aim was to measure and characterize the short-wavelength radio emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the BN/KL star-forming region. Methods: We used the...
Proper Motions of OH Masers and Magnetic Fields in Massive Star-Forming Regions (2007)
Fish, Vincent L., Reid, Mark J.
We present data of proper motions of OH masers in the massive star-forming regions ON 1, K3-50, and W51 Main/South. OH maser motions in ON 1 are consistent with expansion at approximately 5 km/s,...
VLA Observations of HI in the Circumstellar Envelopes of Asymptotic Giant Branch Stars (2007)
Matthews, Lynn D., Reid, Mark J.
(Abridged) We have used the VLA to search for neutral atomic hydrogen in the circumstellar envelopes of five AGB stars. We have detected HI 21-cm emission coincident in both position and velocity...
VLA Observations of HI in the Circumstellar Envelopes of AGB Stars (2006)
Matthews, Lynn D., Reid, Mark J.
We present the results of a VLA search for HI emission in the circumstellar envelopes of five nearby AGB stars: RS Cnc, IRC+10216, EP Aqr, R Cas, and R Aqr. We have detected emission coincident in...
Large Magnetic Fields and Motions of OH Masers in W75 N (2006)
Fish, Vincent L., Reid, Mark J.
We report on a second epoch of VLBA observations of the 1665 and 1667 MHz OH masers in the massive star-forming region W75 N. We find evidence to confirm the existence of very strong (~40 mG)...
Enhanced density and magnetic fields in interstellar OH masers (2006)
Fish, Vincent L., Reid, Mark J., Menten, Karl M., Pillai, Thushara
Aims: We have observed the 6030 and 6035 MHz transitions of OH in high-mass star-forming regions to obtain magnetic field estimates in both maser emission and absorption. Methods: Observations were...
Fish, Vincent L., Reid, Mark J.
We analyze full-polarization VLBA data of ground-state, main-line OH masers in 18 massive star-forming regions previously presented in a companion paper. The OH masers often arise in the shocked...
Loeb, Abraham, Reid, Mark J., Brunthaler, Andreas, Falcke, Heino
A major uncertainty in the dynamical history of the local group of galaxies originates from the unknown transverse speed of the Andromeda galaxy (M31) relative to the Milky Way. We show that the...
Full-Polarization Observations of OH Masers in Massive Star-Forming Regions: I. Data (2005)
Fish, Vincent L., Reid, Mark J., Argon, Alice L., Zheng, Xing-Wu
We present full-polarization VLBA maps of the ground-state, main-line, 2 Pi 3/2, J = 3/2 OH masers in 18 Galactic massive star-forming regions. This is the first large polarization survey of...
Fish, Vincent L., Reid, Mark J., Menten, Karl M.
We have observed six high-mass star-forming regions in the 2 Pi 3/2, J = 7/2 lines of OH using the GBT in order to investigate whether the magnetic field, and hence the density, measured in...
Interstellar Hydroxyl Masers in the Galaxy. II. Zeeman Pairs and the Galactic Magnetic Field (2003)
Fish, Vincent L., Reid, Mark J., Argon, Alice L., Menten, Karl M.
We have identified and classified Zeeman pairs in the survey by Argon, Reid, & Menten of massive star-forming regions with 18 cm (2 Pi 3/2, J = 3/2) OH maser emission. We have found a total of more...
The position, motion, and mass of Sgr A* (2003)
Reid, Mark J., Menten, Karl M., Genzel, Reinhard, Ott, Thomas, Schödel, Rainer, Brunthaler, Andreas
VLBI Observations of OH/IR Stars, (1999)
Reid,Mark J., Muhleman,Duane O.
Very long baseline interferometric observations of 5 type II OH/IR objects indicate that the apparent size of the masering regions are about or greater than 0.1 seconds of arc. The present...
Interferometric Observations of Redshifted Molecular Absorption toward Gravitational Lenses (1998)
Menten, Karl M., Carilli, Christopher L., Reid, Mark J.
We have made radio- and millimeter-wavelength interferometric observations of a variety of molecular absorption lines toward the gravitational lens systems B0218+357 and PKS1830-211. The absorption...
Water maser emission and the parsec-scale jet in NGC 3079 (1997)
Trotter, Adam S., Greenhill, Lincoln J., Moran, James M., Reid, Mark J., Irwin, Judith A., Lo, Kwok-Yung
We have conducted VLBI observations of water maser and radio continuum emission in the nucleus of NGC 3079. The 22 GHz maser emission arises in compact clumps, distributed along an axis that is...
Neutral Hydrogen 21cm Absorption at Redshift 0.673 towards 1504+377 (1996)
Carilli, C. L., Menten, Karl M., Reid, Mark J., Rupen, M. P.
We detect the 21 cm line of neutral hydrogen in absorption at a redshift of 0.673 towards the 1 Jy radio source 1504+377. The 1504+377 radio source is located toward the center of what appears to be...
Early Texas fencing conflicts and some laws which resulted / (1986)
Thesis (B.S.)--East Texas State University, 1986.