The Science Case for Building a Band 1 Receiver for ALMA (2009)
Johnstone, D., Di Francesco, J., Matthews, B., Bartel, N., Casassus, S., Chitsazzadeh, S., ...
We present a set of compelling science cases for the 31-45 GHz Band 1 ALMA Receiver. The science ranges from nearby stars to the re-ionization edge of the Universe. Two of the science cases provide...
Science with ASKAP: the Australian square-kilometre-array pathfinder (2008)
Johnston, S., Taylor, R., Bailes, M., Bartel, N., Baugh, C., Bietenholz, M., ...
The future of cm and m-wave astronomy lies with the Square Kilometre Array (SKA), a telescope under development by a consortium of 17 countries. The SKA will be 50 times more sensitive than any...
VLBI Observations of SN 2008D (2008)
Bietenholz, M. F., Soderberg, A. M., Bartel, N.
We report on two epochs of very-long-baseline interferometry (VLBI) observations of the Type Ib/c supernova SN 2008D, which was associated with the X-ray outburst XRF 080109. At our first epoch, at t...
Science with ASKAP - the Australian Square Kilometre Array Pathfinder (2008)
Johnston, S., Taylor, R., Bailes, M., Bartel, N., Baugh, C., Bietenholz, M., ...
[ABRIDGED VERSION] The future of cm and m-wave astronomy lies with the Square Kilometre Array (SKA), a telescope under development by a consortium of 17 countries. The SKA will be 50 times more...
Science with the Canadian Large Adaptive Reflector (2008)
A. R. Taylor, P. E. Dewdney, S. M. Dougherty, N. Bartel
Canadian scientists and engineers are developing a prototype radio telescope using a novel concept that will permit very large aperture antennas to be constructed at a fraction of current costs. At a...
Shell revealed in SN 1979C (2008)
VLBI observations at 5 GHz have revealed that supernova 1979C, in the galaxy M100 in the Virgo cluster, has shell structure. The shell is approximately circular with the 50% contour deviating from a...
Supernova 1996cr: SN 1987A's Wild Cousin? (2008)
Bauer, F. E., Dwarkadas, V. V., Brandt, W. N., Immler, S., Smartt, S., Bartel, N., ...
We report on new VLT optical spectroscopic and multi-wavelength archival observations of SN1996cr, a previously identified ULX known as Circinus Galaxy X-2. Our optical spectrum confirms SN1996cr as...
The Expansion and Radio Spectral Index of G21.5-0.9: Is PSR J1833-1034 the Youngest Pulsar? (2008)
We report on new 5-GHz VLA radio observations of the pulsar-powered supernova remnant G21.5-0.9. These observations have allowed us to make a high-quality radio image of this remnant with a...
Science with ASKAP The Australian square-kilometre-array pathfinder (2008)
Johnston, S, Taylor, R, Bailes, M, Bartel, N, Baugh, C, Bietenholz, M, ...
Abstract The future of cm and m-wave astronomy lies with the Square KilometreArray (SKA), a telescope under development by a consortium of 17countries. The SKA will be 50 times more sensitive than...
Bartel, N., Bietenholz, M. F., Rupen, M. P., Dwarkadas, V. V.
We compare the angular expansion velocities, determined with VLBI, with the linear expansion velocities measured from optical spectra for supernova 1993J in the galaxy M81, over the period from 7 d...
SN 2001em: No Jet-Driven Gamma Ray Burst Event (2007)
We report on our second-epoch VLBI and VLA observations of the Type Ib/c supernova 2001em, five years after the explosion. It was suggested that SN 2001em might be a jet-driven gamma ray burst (GRB),...
Probing cosmic plasma with giant radio pulses (2007)
Kondratiev, V. I., Popov, M. V., Soglasnov, V. A., Kovalev, Y. Y., Bartel, N., Cannon, W., ...
VLBI observations of the Crab pulsar with the 64-m radio telescope at Kalyazin (Russia) and the 46-m radio telescope of the Algonquin Radio Observatory (Canada) at 2.2 GHz and single-dish...
Detailed studies of giant pulses from the millisecond pulsar B1937+21 (2007)
Kondratiev, V. I., Popov, M. V., Soglasnov, V. A., Kovalev, Y. Y., Bartel, N., Ghigo, F.
The second fastest millisecond pulsar, B1937+21, is one of several pulsars known to emit giant pulses (GPs). GPs are characterized by their huge energy, power-law cumulative energy distribution, and...
Science with the Australian square kilometre array pathfinder (2007)
Johnston, S, Darling, J, Deller, A, Dodson, R, Edwards, PG, Ekers, R, ...
The future of centimetre and metre-wave astronomy lies with the Square Kilometre Array (SKA), a telescope under development by a consortium of 17 countries that will be 50 times more sensitive than...
Science with the Australian Square Kilometre Array Pathfinder (2007)
Johnston, S., Bailes, Matthew, Bartel, N., Baugh, C., Bientneholz, M., Blake, Christopher J., ...
Copyright © Astronomical Society of Australia 2007 Open Access
Science with the Australian Square Kilometre Array Pathfinder (2007)
Johnston, S., Bailes, Matthew, Bartel, N., Baugh, C., Bientneholz, M., Blake, Christopher J., ...
Copyright © Astronomical Society of Australia 2007 Open Access
Science with the Australian square kilometre array pathfinder (2007)
Johnston, S, Darling, J, Deller, A, Dodson, R, Edwards, PG, Ekers, R, ...
The future of centimetre and metre-wave astronomy lies with the Square Kilometre Array (SKA), a telescope under development by a consortium of 17 countries that will be 50 times more sensitive than...
Science with the Australian Square Kilometre Array Pathfinder (2007)
Johnston, S, Bailes, M, Bartel, N, Baugh, C, Bietenholz, M, Blake, C, ...
Science with the Australian square kilometre array pathfinder (2007)
Johnston, S, Darling, J, Deller, A, Dodson, R, Edwards, PG, Ekers, R, ...
The future of centimetre and metre-wave astronomy lies with the Square Kilometre Array (SKA), a telescope under development by a consortium of 17 countries that will be 50 times more sensitive than...
An Upper Limit on the Expansion Velocity of GRB Candidate SN 2001em (2005)
We report on VLBI observations of the Type I b/c supernova 2001em, three years after the explosion. It had been suggested that SN 2001em might be a jet-driven gamma ray burst (GRB), with the jet...
Nine years of VLBI imaging of supernova 1993J (2005)
Bietenholz, M. F., Bartel, N., Rupen, M. P., Beasley, A. J., Graham, D. A., Altunin, V. I., ...
S2 Pulsar Baseband Processing System (2004)
Wietfeldt, R., Bartel, N., Rizzo, D. Del, Straten, W. Van, Cannon, W., Novikov, S., ...
Soglasnov, V. A., Popov, M. V., Bartel, N., Cannon, W., Novikov, A. Yu., Kondratiev, V. I., ...
Giant radio pulses of the millisecond pulsar B1937+21 were recorded with the S2 VLBI system at 1.65 GHz with NASA/JPL's 70-m radio telescope at Tidbinbilla, Australia. These pulses have been observed...
The Crab Nebula's Wisps in Radio and Optical (2004)
Bietenholz, M. F., Hester, J. J., Frail, D. A., Bartel, N.
We present four new, high-resolution VLA radio images of the Crab nebula, taken between 2001 Feb. and Apr. The radio images show systematic variability in the Crab's radio emission throughout the...
The Location of the Core in M81 (2004)
Bietenholz, M. F., Bartel, N., Rupen, M. P.
We report on VLBI observations of M81*, the northwest-southeast oriented nuclear core-jet source of the spiral galaxy M81, at five different frequencies between 1.7 and 14.8 GHz. By phase referencing...
SN 1993J VLBI (III): The Evolution of the Radio Shell (2003)
Bietenholz, M. F., Bartel, N., Rupen, M. P.
We present two sequences of VLBI images of SN1993J in M81, with 24 images at 8.4 GHz and 19 images at 5.0 GHz, These sequences, from 50 d to ~9 yr after shock breakout, show the evolution of the...
VLBI imaging of the RS CVn binary star system HR 5110 (2003)
Ransom, R. R., Bartel, N., Bietenholz, M. F., Ratner, M. I., Lebach, D. E., Shapiro, I. I., ...
We present VLBI images of the RS CVn binary star HR 5110 (=BH CVn; HD 118216), obtained from observations made at 8.4 GHz on 1994 May 29/30 in support of the NASA/Stanford Gravity Probe B project....
Bietenholz, M. F., Bartel, N., Rupen, M. P.
We report on VLBI observations of supernova 1986J in the spiral galaxy NGC 891 at two new epochs, 1990 July and 1999 February, t=7.4 and 15.9 yr after the explosion, and on a comprehensive analysis...
SN 1993J VLBI. II. Related changes of the deceleration, flux density decay, and spectrum (2002)
Bartel, N., Bietenholz, M. F., Rupen, M. P., Beasley, A. J., Graham, D. A., Altunin, V. I., ...
Phase-referenced multifrequency VLBI observations of supernova 1993J in the nearby galaxy M81 at 34 epochs from t = 30 to similar to3000 days after shock breakout show the detailed characteristics of...
Popov, M. V., Bartel, N., Cannon, W. H., Novikov, A. Yu., Kondratiev, V. I., Altunin, V. I.
We report on a study of microstructure and its quasi-periodicities of three pulsars at 1.65 GHz with the S2 VLBI system at a resolution of 62.5 ns, by far the highest for any such statistical study...
SN1993J VLBI (I): The Center of the Explosion and a Limit on Anisotropic Expansion (2001)
Bietenholz, M. F., Bartel, N., Rupen, M. P.
Phase-referenced VLBI observations of supernova 1993J at 24 epochs, from 50 days after shock breakout to the present, allowed us to determine the coordinates of the explosion center relative to the...
A Stationary Core with a One-sided Jet in the Center of M81 (1999)
Bietenholz, M. F., Bartel, N., Rupen, M. P.
The nucleus of M81 was observed at 8.3 GHz with VLBI at 20 epochs over 4.5yrs, with a linear resolution at the source of about 2000 AU or 0.01 pc. Phase-referenced mapping with respect to the...
Variability of the Radio Nucleus of the Galaxy M81 (1997)
Bietenholz, M. F., Bartel, N., Rupen, M. P.
M81 is the nearest galaxy with an active galactic nucleus, with the possibly exception of Cen A. The nucleus is exceptionally compact. Here we present results from new VLA and VLBI observations of...
Dhawan, V., Bartel, N., Rogers, A.E.E., Krichbaum, T.P., Witzel, A., Graham, D.A., ...
Second-epoch observations of the nuclear region of 0316 + 413 (3C 84, NGC 1275) were made at 7 mm wavelength with an angular resolution of 100 microarcsec. They confirm the existence of almost...
The nuclear jet and counterjet region of the radio galaxy Cygnus A.
Bartel, N, Sorathia, B, Bietenholz, M F, Carilli, C L, Diamond, P
Very-long-baseline interferometry images of the nuclear region of the radio galaxy Cygnus A reveal a pronounced "core" and a knotty jet and counterjet. The knots are moving away from the core at...
The nuclear region of the spiral galaxy M81.
Bartel, N, Bietenholz, M F, Rupen, M P
Very-long-baseline radio interferometry images of the nuclear region of the nearby spiral galaxy M81 reveal the most compact galactic core outside the Galaxy of which the size has been determined:...
The nuclear jet and counterjet region of the radio galaxy Cygnus A.
Bartel, N, Sorathia, B, Bietenholz, M F, Carilli, C L, Diamond, P
Very-long-baseline interferometry images of the nuclear region of the radio galaxy Cygnus A reveal a pronounced "core" and a knotty jet and counterjet. The knots are moving away from the core at...
The nuclear region of the spiral galaxy M81.
Bartel, N, Bietenholz, M F, Rupen, M P
Very-long-baseline radio interferometry images of the nuclear region of the nearby spiral galaxy M81 reveal the most compact galactic core outside the Galaxy of which the size has been determined:...