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Detection of CI in absorption towards PKS 1830-211 with the eSMA
Sandrine Bottinelli, A. Meredith Hughes, Ewine F. van Dishoeck +10
We report the first science observations and results obtained with the "extended" SMA (eSMA), which is composed of the SMA (Submillimeter Array), JCMT (James Clerk Maxwell Telescop…
The eSMA: description and first results
Sandrine Bottinelli, Ken H. Young, Richard Chamberlin +15
The eSMA ("extended SMA") combines the SMA, JCMT and CSO into a single facility, providing enhanced sensitivity and spatial resolution owing to the increased collecting area at the…
High-z radio starbursts host obscured X-ray AGN
A. M. S. Richards, R. J. Beswick, S. T. Garrington +8
We use Virtual Observatory methods to investigate the association between radio and X-ray emission at high redshifts. Fifty-five of the 92 HDF(N) sources resolved by combining MERL…
Ring shaped 6.7 GHz methanol maser emission around a young high-mass star
A. Bartkiewicz, M. Szymczak, H. J. van Langevelde
We report on EVN imaging of the 6.7 GHz methanol maser emission from the candidate high-mass protostar G23.657-0.127. The masers originate in a nearly circular ring of 127 mas radi…
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…
The shroud around the "compact, symmetric" radio jets in NGC 1052
R. C. Vermeulen, E. Ros, K. I. Kellermann +3
This is a paper on young jet material in a frustratingly complex environment. NGC 1052 has a compact, flat- or GHz-peaked-spectrum radio nucleus consisting of bi-symmetric jets, or…
Astrometry of circumstellar masers
H. J. van Langevelde, W. H. T. Vlemmings
The circumstellar masers around evolved stars offer an interesting possibility to measure stellar parameters through VLBI astrometry. In this paper the application of this techniqu…
Circular Polarization of Water Masers in the Circumstellar Envelopes of Late Type Stars
W. H. T. Vlemmings, P. J. Diamond, H. J. van Langevelde
We present circular polarization measurements of circumstellar H_2O masers. The circular polarization detected in the (6_{16}-5_{23}) rotational transition of the H_{2}O maser can…
Magnetic Fields in the envelopes of late-type stars: Circular Polarization of H2O Masers
W. H. T. Vlemmings, P. J. Diamond, H. J. van Langevelde
We present the first circular polarization measurements of circumstellar water masers around a sample of late-type stars. These observations are used to obtain the magnetic field s…
AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field
M. A. Garrett, T. W. B. Muxlow, S. T. Garrington
VLBI now has the capability of imaging relatively large fields-of-view (~ 5 arcmin sq) with sub-mJy detection limits. In principle such observations can distinguish between starbur…
The ATCA/VLA OH 1612 MHz survey. III. Northern Galactic Plane
M. Sevenster, H. v. Langevelde, R. Moody +3
We present observations of the region between 5deg < l < 45deg and |b| < 3deg, in the OH 1612 MHz line, taken from 1993 to 1995 with the VLA. These observations are the last part o…
Multi-frequency VLBI observations of faint gigahertz peaked spectrum sources
Ignas Snellen, Richard Schilizzi, Huib-Jan van Langevelde
We present the data and analysis of VLBI observations at 1.6, 5 and 15 GHz of a sample of faint Gigahertz Peaked Spectrum (GPS) sources selected from the Westerbork Northern Sky Su…
Faint Gigahertz peaked spectrum sources and the evolution of young radio sources
I. A. G. Snellen, R. T. Schilizzi, G. K. Miley +3
GPS sources are the objects of choice to study the initial evolution of extragalactic radio sources, since it is most likely that they are the young counterparts of large scale rad…
Sub-arcsecond imaging at 267 GHz of a young binary system: Detection of a <70 AU radius dust disk around T Tau N
M. R. Hogerheijde, H. J. van Langevelde, L. G. Mundy +2
The young binary system T Tau was observed with the Owens Valley Millimeter Array at 267 GHz continuum and HCO+ J=3-2 emission at 0.8'' resolution, with the JCMT-CSO single-baselin…
Tracing the envelopes around embedded low-mass young stellar objects with HCO+ and millimeter-continuum observations
Michiel R. Hogerheijde, Ewine F. van Dishoeck, Geoffrey A. Blake +1
Interferometer observations of millimeter-continuum (OVRO) and single-dish observations of HCO+ and H13CO+ J=1-0, 3-2, and 4-3 (JCMT, IRAM 30m) are presented of nine embedded low-m…
Anisotropic Scattering of OH/IR Stars Towards the Galactic Center
D. A. Frail, P. J. Diamond, J. M. Cordes +1
We have made angular broadening measurements in the satellite line of the OH molecule at 1612 MHz of 8 OH/IR stars located near the Galactic Center with the Very Large Array. Early…