Pulsars, transients and relativistic astrophysics

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Structure in the radio counterpart to the 2004 December 27 giant flare from SGR 1806–20

Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press (OUP) 367:1 (2006) l6-l10

Authors:

RP Fender, TWB Muxlow, MA Garrett, C Kouveliotou, BM Gaensler, ST Garrington, Z Paragi, V Tudose, JCA Miller-Jones, RE Spencer, RAM Wijers, GB Taylor
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Candidate Isolated Neutron Stars and Other Optically Blank X-Ray Fields Identified from the ROSAT All-Sky and Sloan Digital Sky Surveys**Includes observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium.

The Astronomical Journal American Astronomical Society 131:3 (2006) 1740-1749

Authors:

Marcel A Agüeros, Scott F Anderson, Bruce Margon, Bettina Posselt, Frank Haberl, Wolfgang Voges, James Annis, Donald P Schneider, Jonathan Brinkmann
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Deep spectroscopy of a young radio source at z = 0.521

Astronomische Nachrichten Wiley 327:2‐3 (2006) 171-174

Authors:

KJ Inskip, D Lee, G Cotter, ACS Readhead, TJ Pearson
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Adapting and expanding interferometric arrays

ArXiv astro-ph/0602578 (2006)

Authors:

A Karastergiou, R Neri, MA Gurwell

Abstract:

We outline here a simple yet efficient method for finding optimized configurations of the elements of radio-astronomical interferometers with fixed pad locations. The method can be successfully applied, as we demonstrate, to define new configurations when changes to the array take place. This may include the addition of new pads or new antennas, or the loss of pads or antennas. Our method is based on identifying which placement of elements provides the most appropriate uv plane sampling for astronomical imaging.
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Complex small-scale structure in the infrared extinction towards the Galactic Centre

ArXiv astro-ph/0602410 (2006)

Authors:

Andrew J Gosling, Katherine M Blundell, Reba Bandyopadhyay

Abstract:

A high level of complex structure, or ``granularity'', has been observed in the distribution of infrared-obscuring material towards the Galactic Centre (GC), with a characteristic scale of 5arcsec - 15arcsec, corresponding to 0.2 - 0.6pc at a GC distance of 8.5kpc. This structure has been observed in ISAAC images which have a resolution of 0.6arcsec, significantly higher than that of previous studies of the GC. We have discovered granularity throughout the GC survey region, which covers an area of 1.6deg x 0.8deg in longitude and latitude respectively (300pc x 120pc at 8.5kpc) centred on Sgr A*. This granularity is variable over the whole region, with some areas exhibiting highly structured extinction in one or more wavebands and other areas displaying no structure and a uniform stellar distribution in all wavebands. The granularity does not appear to correspond to longitude, latitude or radial distance from Sgr A*. We find that regions exhibiting high granularity are strongly associated with high stellar reddening.
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