Dave Green: research

Dave Green's research

Research topics: SNRs | GMRT | Papers | [new] `cubehelix' [new] | Other

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Also available, with corrections, in the physics section of the Oxford Scholarship Online full-text library (January 2010). [new]

1) Supernova Remnants

updated! My Catalogue of Galactic Supernova Remnants (SNRs) contains details of 274 SNRs (last revised: 2009 March).

Recent studies of the very young Galactic supernova remnant G1.9+0.3.

I wrote a book with F. R. Stephenson on Historical Supernovae and their Remnants, which is published by Oxford University Press (2002 August).

Recent papers on Galactic SNR statistics:

A revised Galactic supernova remnants catalogue, Green D. A., 2009BASI...37...45G
Some statistics of Galactic SNRs, Green D. A., 2005MmSAI..76..534G

Other work on SNRs is included in my list of recent papers below.

2) Giant Metrewave Radio Telescope (GMRT)

In recent years much of my observational research has involved observations with the Giant Metrewave Radio Telescope (GMRT), near Pune, India.

2.1) Deep extragalactic surveys

These observations include a deep (1σ noise of about 30 μJy beam⁻¹ at best) 610-MHz survey of the Spitzer extragalactic First Look Survey (FLS) region. These cover about 4 square degrees, with a mosaic of seven pointings, with a resolution of about 5 arcsec, and detected nearly four thousand sources. These observations are published in:

Deep 610-MHz GMRT observations of the Spitzer extragalactic First Look Survey field -- I. Observations, data analysis and source catalogue, Garn, T.S., Green, D.A., Hales, S.E.G., Riley, J.M., Alexander, P., 2007MNRAS.376.1251G (also arXiv:astro-ph/0701534).

The other regions processed so far are the ELAIS-N1 and ELAIS-N2 fields, and the Lockman Hole field. These observations are published in:

A 610-MHz survey of the ELAIS-N1 field with the Giant Metrewave Radio Telescope – Observations, data analysis and source catalogue, Garn, T.S., Green, D.A., Riley, J.M., Alexander, P., 2008MNRAS.383...75G (also arXiv:0710.1500 [astro-ph]).
A 610-MHz survey of the Lockman Hole with the Giant Metrewave Radio Telescope – I. Observations, data reduction and source catalogue for the central 5 deg², Garn T. S., Green D. A., Riley J. M., Alexander P. 2008MNRAS.387.1037G (also arXiv:0804.2421 [astro-ph]).
The relationship between star formation rate and radio synchrotron luminosity at 0 < z < 2, Garn T. S., Green D. A., Riley J. M., Alexander P. 2009MNRAS.397.1101G (also arXiv:0905.1218 [astro-ph]).
Further GMRT observations of the Lockman Hole at 610 MHz Garn T. S., Green D. A., Riley J. M., Alexander P., 2010BASI...38..103G (also arXiv:1008.2777 [astro-ph])

The source catalogues and survey images are also available: FLS, ELAIS-N1, ELAIS-N2, Lockman Hole.

A GMRT antenna or two.

A deep 610-MHz image of (a small portion of) the Spitzer extragalactic First Look Survey region. The resolution is about 5 arcsec, and the r.m.s. noise about 30 μJy beam⁻¹.

2.2) Useful AIPS tasks

Other users of the GMRT may find the following (classic) AIPS tasks that I have written useful:

UVFXT, to correct for slight time error -- and hence uvw coordinate errors -- in GMRT uv FITS data produced at the telescope before mid-2006;
UVFLP, to flip the order of the channels in a uv database, so that LSB data can be combined with USB data in AIPS, using DBCON. (Recent versions of AIPS, 31DEC07 and later, now contain a task -- FLOPM -- which can do the flipping of channels.)

Users of AIPS should also note that there were various bugs in SPLAT/SPLIT tasks, when averaging spectral channels, which were patched in the 31DEC06 and 31DEC07 versions of AIPS in Oct/Nov 2007. Some of these bugs applied only to more recent uv datasets written at the GMRT that combine both sidebands into one file, but others apply to single sideband uv datasets also. See patches 17, 18 and 19 for more details.

3) Research Papers

Here is a list of my published and submitted research papers. This includes the following recent work (see also the papers listed under SNRs or the GMRT above):

Young Galactic SNR G1.9+0.3 at 1.5/4.9
GHz showing expansion

A fake image of G1.9+0.3, with NE and SW quadrants at 1.5 GHz observed in 1985, and NW and SE quadrants at 4.9 GHz observed in 2008, showing a large expansion (see Green et al. 2008 for further details).

The Crab Nebula at 850 μm, observed with SCUBA.

X-ray spectral variations in the youngest Galactic Supernova Remnant G1.9+0.3, Reynolds S. P., Borkowski K. J., Green D. A., Hwang, U., Harrus I., Petre R., 2009ApJ...695L.149R (see arXiv:0903.1870)
An excess of emission in the dark cloud LDN 1111 with the Arcminute Microkelvin Imager, Scaife A. M. M., Hurley-Walker N., Green D. A., Davies M. L., Grainge K. J. B., Hobson M. P., Lasenby A. N., Lpez-Caniego M., Pooley G. G., Saunders R. D. E., Scott P. F., Titterington D. J., Waldram E. M., Zwart J. T. L., 2009MNRAS.394L..46A (see arXiv:0812.0917)
The radio expansion and brightening of the very young supernova remnant G1.9+0.3, Green D. A., Reynolds S. P., Borkowski K. J., Hwang, U., Harrus I., Petre R., 2008MNRAS.387L..54G (also arXiv:0804.2317)
The Youngest Galactic Supernova Remnant: G1.9+0.3, Reynolds S. P., Borkowski K. J., Green D. A., Hwang, U., Harrus I., Petre R., 2008ApJ...680L..41R (also arXiv:0803.1487)
AMI limits on 15 GHz excess emission in northern HII regions, Scaife A., Hurley-Walker, N., Davies, M. L., Duffett-Smith P. J., Feroz F., Grainge K. J. B., Green D. A., Hobson M. P., Kaneko T., Lasenby A. N., Pooley G. G., Saunders R. D. E., Scott P. F., Titterington D. J., Waldram E. M., Zwart J., 2008MNRAS.385..809S (also arXiv:0711.3120)
Comments on the radio spectrum of HB 3, Green D. A., 2007BASI...35...77G (also arXiv:0705.2642)
The discovery of PSR J1833-1034: the pulsar associated with the supernova remnant G21.5-0.9, Gupta, Y., Mitra, D., Green, D. A., Acharyya, A., 2005CSci...89..853G (also arXiv:astro-ph/0508257)
Far-infrared and sub-mm observations of the Crab nebula, Green D. A., Tuffs R. J., Popescu C. C., 2004MNRAS.355.1315G (also arXiv:astro-ph/0409469)

4) ``cubehelix`' colour scheme

I've recently written up a short paper on a colour scheme that I've developed for the display of intensity images (which increases in percieved brightness, and prints as greyscale on black and white postscript devices). For example:

an example `cubehelix' colour scheme

See my `cubehelix' page for further details.

5) Other

Further details of some of my other research interests:

The 7C(G) survey of compact sources in the northern Galactic plane at 151 MHz (also see Vessey, S. J. & Green, D. A., 1998MNRAS.294..607V).
Observations of SN1993J and SN1994I at 15.2 GHz made with the Ryle Telescope.
I have co-edited the electronic proceedings of these conferences:
1. the Particle Physics and the Early Universe conference, which was held in Cambridge in 1997 April;
2. the XXVIIth Young European Radio Astronomers Conference, which was held in Cambridge in 1994 September.
I was co-editor of The Low-Frequency Radio Universe: An Event Commemorating the Birth Centenary of Dr Homi J. Bhabha, edited by D. J. Saikia, D. A. Green, Y. Gupta & T. Venturi (Astronomical Society of the Pacific Conference Series, Vol. 407, proceedings of a conference held 8-12 December 2008, at the National Centre for Radio Astrophysics, TIFR, Pune, India), see 2009ASPC..407.....S.
I am also on the editorial board of the Bulletin of the Astronomical Society of India.

Radio light curve of SN1993J.

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