471 citations · 4.4k across the 64 of their papers we have counts for
40 papers · 1 filter
The 6-GHz Multibeam Maser Survey I. Techniques
J. A. Green, J. L. Caswell, G. A. Fuller +22
A new 7-beam 6-7 GHz receiver has been built to survey the Galaxy and the Magellanic Clouds for newly forming high-mass stars that are pinpointed by strong methanol maser emission…
Multibeam Maser Survey of methanol and excited OH in the Magellanic Clouds: new detections and maser abundance estimates
J. A. Green, J. L. Caswell, G. A. Fuller +21
We present the results of the first complete survey of the Large and Small Magellanic Clouds for 6668-MHz methanol and 6035-MHz excited-state hydroxyl masers. In addition to the su…
Multi-wavelength (radio, X-ray and gamma-ray) observations of the gamma-ray binary LS I +61 303
MAGIC Collaboration, J. Albert
We present the results of the first multiwavelength observing campaign on the high-mass X-ray binary LS I +61 303 comprising observations at the TeV regime with the MAGIC telescope…
Superluminal non-ballistic jet swing in the quasar NRAO 150 revealed by mm-VLBI
I. Agudo, U. Bach, T. P. Krichbaum +11
NRAO 150 -a compact and bright radio to mm source showing core/jet structure- has been recently identified as a quasar at redshift z=1.52 through a near-IR spectral observation. To…
A MERLIN Study of 6 GHz Excited-state OH & 6.7 GHz Methanol Masers in ON1
J. A. Green, A. M. S. Richards, W. H. T. Vlemmings +2
MERLIN observations of 6.668-GHz methanol and both 6.031- and 6.035-GHz hydroxyl (OH) emission from the massive star-formation region ON1 are presented. These are the first methano…
The radio spectra of the compact sources in Arp 220: A mixed population of supernovae and supernova remnants
Rodrigo Parra, John E. Conway, Philip J. Diamond +4
We report the first detection at multiple radio wavelengths (13, 6 and 3.6 cm) of the compact sources within both nuclei of the Ultra Luminous Infra-Red Galaxy Arp 220. We present…
Intrinsic properties of the magnetically collimated water maser jet of W43A
W. H. T. Vlemmings, P. J. Diamond
Water maser polarization observations in the precessing jet of W43A have revealed that it is magnetically collimated. Here we present a detailed description of the physical propert…
A magnetically collimated jet from the evolved star W43A
W. H. T. Vlemmings, P. J. Diamond, H. Imai
We present the first direct measurements of the magnetic field strength and direction in a collimated jet from an evolved star on its way to become a planetary nebula. Very Long Ba…
VLBI Images of 49 Radio Supernovae in Arp 220
Colin J. Lonsdale, Philip J. Diamond, Hannah Thrall +2
We have used a Very Long Baseline Interferometry (VLBI) array at 18cm wavelength to image the nucleus of the luminous IR galaxy Arp 220 at ~1 pc linear resolution, and with very hi…
A magnetically collimated jet from an evolved star
W. H. T. Vlemmings, P. J. Diamond, H. Imai
Planetary nebulae often have asymmetric shapes, which could arise due to collimated jets from evolved stars before evolution to the planetary nebula phase. The source of jet collim…
The Magnetic Field in the Star-forming Region Cepheus A from Water Maser Polarization Observations
W. H. T. Vlemmings, P. J. Diamond, H. J. van Langevelde +1
We present linear and circular polarization observations of the water masers in 4 distinct regions spread over 1x2 arcseconds around the HW2 high-mass young stellar object in the C…
Magnetic fields around late-type stars using water maser observations
W. H. T. Vlemmings, H. J. van Langevelde, P. J. Diamond
We present the analysis of the circular polarization, due to Zeeman splitting, of the water masers around a sample of late-type stars to determine the magnetic fields in their circ…
Axial Symmetry and Rotation in the SiO Maser Shell of IK Tauri
D. A. Boboltz, P. J. Diamond
We observed v=1, J=1-0 43-GHz SiO maser emission toward the Mira variable IK Tauri (IK Tau) using the Very Long Baseline Array (VLBA). The images resulting from these observations…
The magnetic field around late-type stars revealed by the circumstellar H2O masers
W. H. T. Vlemmings, H. J. van Langevelde, P. J. Diamond
Through polarization observations, circumstellar masers are excellent probes of the magnetic field in the envelopes of late-type stars. Whereas observations of the polarization of…
Hidden bipolarity in red supergiant winds
A. M. S. Richards, M. R. W. Masheder, H. J. van Langevelde +7
Many observations of late-type M stars show large near-spherical circumstellar envelopes, yet planetary nebulae and supernova remnants are frequently axisymmetric. We present VLBI…
High-resolution radio imaging of young supernovae
M. A. Perez-Torres, J. M. Marcaide, A. Alberdi +12
The high resolution obtained through the use of VLBI gives an unique opportunity to directly observe the interaction of an expanding radio supernova with its surrounding medium. We…
Multi-transition VLBA observations of circumstellar SiO masers
R. Soria-Ruiz, F. Colomer, J. Alcolea +5
On this paper, we present simultaneous VLBA observations of the J=1-0 and J=2-1 rotational lines in the v=1 and v=2 vibrationally excited states of SiO (at 7 and 3 mm wavelengths).…
A movie of a star: multi-epoch VLBA imaging of the SiO masers towards the Mira variable TX Cam
P. J. Diamond, A. J. Kemball
We describe an observing campaign using the Very Long Baseline Array (VLBA) to monitor the time-evolution of the v=1, J=1-0 SiO maser emission towards the Mira variable TX Cam. The…
The Most Detailed Picture Yet of an Embedded High-mass YSO
L. J. Greenhill, M. J. Reid, C. J. Chandler +2
High-mass star formation is not well understood chiefly because examples are deeply embedded, relatively distant, and crowded with sources of emission. Using VLA and VLBA observati…
A search for extragalactic H2O maser emission towards IRAS galaxies II - Discovery of an H2O maser in the Seyfert 1 galaxy NGC 4051
Yoshiaki Hagiwara, Philip J Diamond, Makoto Miyoshi +2
Water vapor maser emission in the 6_{16}-5_{23} transition towards the narrow-line Seyfert 1 (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic…
Astrometry of the OH masers of 4 Mira stars
Wouter Vlemmings, Huib Jan van Langevelde, Phil Diamond
The OH main line masers in circumstellar shells were observed with astrometric VLBI in order to accurately determine the position of the star, as well as its motion, including the…
VLBI astrometry of circumstellar OH masers; proper motions and parallaxes of four AGB stars
W. H. T. Vlemmings, H. J. van Langevelde, P. J. Diamond +2
The main-line OH masers around 4 AGB stars have been observed with the NRAO Very Long Baseline Array (VLBA) at 8 epochs over a period of 2.5 years. Using a phase referencing techni…
VLBI Imaging of Luminous Infrared Galaxies: AGN Cores in Mrk231, UGC 5101 & NGC 7469
Carol J. Lonsdale, Colin J. Lonsdale, Harding E. Smith +1
We report 18cm VLBI continuum imaging observations at 5 mas resolution for UGC 5101, NGC 7469, and Mrk 231, all part of a sample of Luminous Infrared Galaxies which have been shown…
Location of H2O maser in the double-nuclei system of NGC6240
Yoshiaki Hagiwara, Philip J. Diamond, Makoto Miyoshi
We performed VLA observations of the 22 GHz H2O maser emission in the merging galaxy NGC6240, which hosts the well-known double active nuclei. In a previous paper, we reported on t…