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Status and capabilities of the Australian LBA. Phil Diamond Chief, Astronomy & Space Science. Overview. Overview of the LBA Recent usage Recent developments eVLBI progress ATNF user affiliations Looking ahead. The Long Baseline Array (LBA).

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Status and capabilities of the australian lba
Status and capabilities of the Australian LBA

  • Phil Diamond

  • Chief, Astronomy & Space Science


Overview
Overview

  • Overview of the LBA

  • Recent usage

  • Recent developments

  • eVLBI progress

  • ATNF user affiliations

  • Looking ahead


The long baseline array lba
The Long Baseline Array (LBA)

  • Operated as a National Facility by CSIRO, in close cooperation with Uni. of Tasmania & Curtin Uni.

  • Core elements: ATCA (5x22m), Mopra (22m), Parkes (64m), Ceduna (30m), Hobart (26m)

  • + Tidbinbilla (70m & 34m), Hart (26m), TIGO (6m), O’Higgins (9m), Warkworth (12m), … + ASKAP

  • Traditionally 3 x ~1 week sessions per year, evolving toward more frequent, shorter sessions

  • Observations in the 20, 13, 6, 3, 1cm bands

  • Max. bit-rate 1Gbps (ATNF), 512Mbps (elsewhere)

  • Disk-based recorders (with most data later streamed to correlator) or/and eVLBI on a subset of the array

  • DiFX software correlator (Deller et al.  2007, 2011)


Radio Telescopes in Australia

x Katherine

x ASKAP

x Yarragadee

x New Norcia

x


The lba in 2010
The LBA in 2010

  • Six sessions

    • March, May, July, October, November, December

  • A total of 24 days

  • 34 observations

    • 3x22GHz, 16x8.4GHz, 8x6.7GHz, 3x2.3GHz, 4x1.4GHz

  • 15 projects -- led by 14 different PIs

    • 7 from Australia and 7 from overseas

  • ~5% test and development time

  • The LBA is oversubscribed: about 2/3 of proposals are allocated some observing time

  • Separate Parkes & Hobart (and new AuScope 3x12m array) participation in IVS



Recent lba publications
Recent LBA publications

  • First VLBI Detection of the Radio Remnant of Supernova 1987A: Evidence for Small-scale Features (Ng et al. 2011 ApJL in press, arXiv:1012.5092)

  • The LBA Calibrator Survey of southern compact extragalactic radio sources - LCS1 (Petrov et al. 2011 PASA in press, arXiv:1012.2607)

  • Evolution of the Parsec-scale Structure of PKS 1934-638 Revisited: First Science with the ASKAP and New Zealand Telescopes (Tzioumis et al. 2010 AJ 140, 1506)

  • TANAMI: tracking active galactic nuclei with austral milliarcsecond interferometry . I. First-epoch 8.4 GHz images (Ojha et al. 2010 A&A 519, A45)

  • LBA observations of the maser cluster OH 330.953-0.182 (Caswell et al. 2010 MNRAS 402, 2649)

  • Implications of a VLBI Distance to the Double Pulsar J0737-3039A/B(Deller et al. 2009 Science 323, 1327)

  • Parsec-Scale Shocks in the Kiloparsec-Scale Jet of Centaurus A (Tingay & Lenc 2009 AJ 138, 808)


eVLBI – Gbps links between existing ATNF sites

ATCA

Mopra

To Seattle 10 Gbps

Parkes

Sydney


Evlbi current status
eVLBI Current Status

  • Up to 1Gbps between At-Mp-Pa is available

    • Correlate on a computer cluster at Narrabri

  • 128 Mbps to Hobart, and improvement in connection across Bass Strait to 1 Gbps expected in Q1 this year

  • Successful eVLBI demonstrations with Shanghai, Kashima, JIVE, and HartRAO at 512Mbps

  • 512Mbps link to Warkworth (NZ) now available

  • Participation in EXPReS and NEXPReS

  • 9th eVLBI Workshop held in Perth, Oct 2010

    (see http://www.icrar.org/news/pastevents/e-vlbi2010)


ASKAP at the Murchison Radio Observatory

5 Sept/Oct 2010

Jan 2010

Antennas 36 x 12m, three-axis design

Max baseline 8 km

Frequency 700–1800 MHz

FOV 30 deg2

Bandwidth 300 MHz

Channels 16k

PAF 10x10x2

Tsys ~35 K

Six element test array (BETA) in 2011

ASKAP operational in Q2 2013


Askap ww
ASKAP + Ww

First fringes at 20cm between LBA and first ASKAP antenna and Warkworth 12m in New Zealand in April/May 2010.

Observations made

of Cen A and

PKS 1934-638.

Ww to formally join LBA for observations at 1.4, 2.3 and 8.4 GHz.


MRO

MRO Ceduna Hobart Parkes ATCA Tidbinbilla Warkworth

The Expanding LBA



Future challenges opportunities
Future challenges & opportunities

  • LBA data to be added to ATOA (on-line archive) this year

  • Hydrogen Maser on order for ASKAP

  • Addition of 20cm band to Ceduna planned

  • The LBA DASs will soon need replacing

  • Opportunities for collaboration with VLBA…

    • cumvlbaobs.txt file indicates VLBA observes sources with dec < 0 for ~21% of time

    • Best overlap with MK, OV, KP, PT, LA, FD

  • …and EAVN and AuScope and space VLBI

  • New 34m antennas funded for Tidbinbilla

  • Improved eVLBI access expected

    • for Hobart, Warkworth, and possibly Tid, but unlikely for Ceduna


More information
More information

  • Next proposal deadlines

    • June 15 and Dec 15

  • Information about the LBA

    • www.atnf.csiro.au/vlbi

  • Sensitivity calculator

    • www.atnf.csiro.au/vlbi/calculator_2009

  • LBA data into on-line archive

    • atoa.atnf.csiro.au (coming soon)


Thank you

CSIRO/ATNF

Phil Diamond

Chief, Astronomy & Space Science, CSIRO

Email:[email protected]

Web: www.atnf.csiro.au

Thank you

Contact UsPhone: 1300 363 400 or +61 3 9545 2176Email: [email protected] Web: www.csiro.au


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