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ATNF
Student Symposium 2003
9:30am Welcome
9:40am First Session Chair: Rachel Deacon
9:40am Aidan Hotan The Latest Developments in Pulsar Research at Parkes
10:00am Haydon Knight High Time Resolution Studies of Pulsars
10:20am Natasa Vranesevic Challenging question on emission from energetic young radio pulsars
10:40am Co#ee
11:10am Second Session Chair: Daniel Mitchell
11:10am Rachel Deacon Origin of Planetary Nebulae Morphologies
11:30am Ilana Klamer Star formation in high redshift radio galaxies
11:50am Jennifer Donley Discovery of a Supermassive HI galaxy
12:10pm Emma Ryan­Weber Intergalactic HII Regions.
12:30pm Lunch
13:30pm Third Session Chair: ...
13:30pm Daniel Mitchell Dual­Reference Adaptive Filters
13:50pm Anil Chandra Remote Visualisation System(RVS)
14:10pm Aaron Chippendale ...
14:30pm Close

Abstracts
Aidan Hotan
The Latest Developments in Pulsar Research at Parkes
I will discuss recent developments, both scientific and technological, related to Pulsar research in Aus­
tralia. Two new instruments have been commissioned at the Parkes radio telescope in the past 12 months
and a new dual­band receiver is due for installation in December. The new hardware makes Parkes one of
the most powerful pulsar research tools in the world. I will present preliminary results of several experi­
ments that take advantage of the new instruments, demonstrating the enhanced observational capabilities
they provide.
Haydon Knight, Swinburne
High Time Resolution Studies of Pulsars
In August 2002 a new baseband recorder was commissioned at the Parkes Radiotelescope. The Caltech­
Parkes­Swinburne­Recorder Mark 2 (CPSR2) samples a 128MHz band once every 8 nanoseconds, o#ering
new insight into many aspects of pulsar astronomy. I will discuss the use of CPSR2 to search for ultrafast
and highly accelerated pulsars, its use in RFI mitigation, and application of its fast sampling rate to
study transient radio phenomena, such as giant pulses from the millisecond pulsar J1824­2452.
Natasa Vranesevic, University of Sydney
Challenging question on emission from energetic young radio pulsars
In the last few years number of neutron stars have been discovered with magnetic fields of magnitude
only imagined by a few theorists. The previous highest measured neutron stars fields were around 10 to
13 Gauss. The Parkes Multibeam Survey has now detected a number of new radio pulsars having surface
magnetic fields of near 10 to 14 Gauss, and has been particularly e#cient at finding young objects in
the inner Galaxy. Soft Gammma­Ray Repeaters (SGRs) and Anomalous X­Ray Pulsars (AXPs) with
surface fields possibly as high as 10 to 15 Gauss, now believed to be the predicted magnetars, are even
more remarkable. The circumstance that 18region, give us a good reason for observation throughout the
electromagnetic spectrum to attain a true picture of the compact objects population. This review sum­
marises the latest discovery of energetic young radio pulsars and open challenging question on emission
from these exotic objects.
Rachel Deacon, University of Sydney
Origin of Planetary Nebulae Morphologies
I am studying a sample of 87 post­AGB stars at maser frequencies in order to determine the structure
and kinematics of their circumstellar shells. The cause/s of the varied morphologies of planetary nebulae,
which can be categorised as widely as elliptical, spherical, bipolar or amorphous, are as yet unexplained.
Studying these precursor stars will give more insight into the processes happening.
I will summarise results so far from spectral observations at OH maser lines taken with the Parkes tele­
scope, problems encountered, possible interpretations and future work.

Ilana Klamer, University of Sydney
Star formation in high redshift radio galaxies
An important diagnostic for exploring the star formation history in the universe is the CO molecule,
whose rotational transitions are caused primarily by collisions with molecular hydrogen in dense molec­
ular clouds. Observations of di#erent CO transitions can tell us about the kinematics, temperature and
density of the molecular clouds, as well as providing an independent tracer of the star formation rate. At
high redshift (z¿3.5) this has only been done for a handful of carefully selected sources with extremely
large infra­red luminosities. With a complete sample of the most massive galaxies at high redshift, and
access to the new 12mm system at the ATCA, we plan to study the CO(1­¿0) line emission at high redshift.
Jennifer Donley
Discovery of a Supermassive HI galaxy
The Parkes HIPASS and ZOA surveys are excellent tools to detect normal HI galaxies throughout the
Local Universe. These surveys, however, also have the potential to uncover rare objects. I will discuss
the discovery of one such object, a supermassive spiral galaxy with an HI mass comparable to that of
Malin 1. This galaxy was first detected in the ZOA multibeam survey, and has since been followed­up
with both the ATCA and the AAT.
Emma Ryan­Weber, University of Melbourne
Intergalactic HII Regions
We have discovered a number of very small isolated HII regions 20­30 kpc from the nearest galaxy. These
HII regions appear as tiny Emission Line dots (or ELdots) in narrow band images obtained by the NOAO
Survey for Ionisation in Neutral Gas Galaxies (SINGG). We have spectroscopic confirmation of 5 ELdots
in 3 systems. The H­alpha luminosities of these ELdots are equivalent to the ionising flux of only 1­2 OB
stars each. Two systems with confirmed ELdots have large tidal HI features. The ELdots could result
from in situ star formation or ionisation by runaway B stars from a nearby galaxy. If the ELdots are
ionised by stars formed in situ, they represent atypical star formation in the low density environment of
galaxy outskirts.
Daniel Mitchell
Dual­Reference Adaptive Filters
Adaptive filters can be used to model the radio frequency interference environment so that it can be
cancelled from the astronomy signal path. The standard adaptive filter will be reviewed, and I will
describe a variant which utilises an additional reference signal to improve excision. The use of a sec­
ond independent reference can theoretically lead to complete cancellation. The trade­o# is that the noise
injected by the dual reference filter contains more power than the total residual of a single reference filter.
Anil Chandra
Remote Visualisation System (RVS)
Astronomers and astro physicists will find extremely useful a system that allows them to visualise and
analyse data cubes on demand, irrespective of where in the world the data is located. The di#culties of
achieving this are associated with the location, transmission and transformation of the data. How can a
user interact with the data without the performance penalty typically associated with remote communi­

cation?
The Remote Visualisation System (RVS) is a software system that will work as part of the International
Virtual Observatory (IVO) to provide a solution to these problems. The RVS will receive data from
an independent remote data centre, transform the data and transmit formatted data to a client side
application for flexible visualisation and analysis.
Aaron Chippendale
I will illustrate the e#ects of a variable primary beams in synthesis imaging and discuss several algorithms
for accommodating them which I plan to investigate. On a second thread, I will discuss the modelling
of nonlinear systems with a view to determining the spectral dynamic range of hypothetical receivers for
the all sky EoR experiment.