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Radio Science and PILOT. Tony Wong ATNF/UNSW PILOT Workshop 26 March 2003. New Synergies. PILOT: 2m, 1-30  m (10-300 THz). Starlight, thermal dust continuum, recombination lines, excited H 2 , PAH features.

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Radio science and pilot

Radio Science and PILOT

Tony Wong

ATNF/UNSW

PILOT Workshop

26 March 2003


New synergies
New Synergies

  • PILOT: 2m, 1-30 m (10-300 THz). Starlight, thermal dust continuum, recombination lines, excited H2, PAH features.

  • ATCA: 6 x 22m, 1-105 GHz. HI, synchrotron, free-free emission, molecular masers, thermal molecular lines, dust continuum.

  • ALMA (2010): 64 x 12m, 30-850 GHz. Thermal molecular lines, atomic fine-structure lines, dust continuum, recombination lines, CMB.

  • IRQA (2010?):0.1-0.2 GHz? Synchrotron, free-free absorption, redshifted HI.


Radio ir astrometry
Radio-IR Astrometry

  • Massive stars tend to form in clusters at great distances, and thus accurate astrometry is needed to make firm IDs.

  • Since mid-IR sources are often invisible in the optical/NIR, astrometry must be performed by comparison with radio synthesis maps.

  • Results can significantly affect interpretation!

Methanol masers (diamonds) on 18um OSCIR/Keck contours, de Buizer et al. (2002)


Mid ir as a sfr indicator
Mid-IR as a SFR indicator

  • Relatively few galaxies have been imaged in the mid-IR (e.g. Roussel et al. 2001 with ISOCAM, 10”).

  • Integrated mid-IR light is a combination of continuum from small grains and aromatic bands due to molecular aggregates (PAHs?).

  • Potentially good tracer of massive star formation if excitation is dominated by HII regions.


The mid ir radio correlation
The mid-IR/radio correlation

  • Gruppioni et al. (2003) have compared faint (~mJy) 15µm sources detected by ISO (ELAIS-S1, S2) with 1.4 GHz ATCA imaging.

  • Strong mid-IR/radio correlation, though not as tight as FIR/radio: uncertain mid-IR K-corrections?

  • Is PILOT sensitive enough to study this population?


Summary
Summary

  • Radio/submm observations of the ISM can complement PILOT’s capabilities, especially in the mid-IR (4-30 µm).

    • Large FOV facilitates astrometry with radio maps.

    • Mid-IR a useful probe of star formation, both in nearby and distant galaxies.

    • Circumstellar envelopes around AGB stars: mass loss rates from CO line profiles, colours from mid-IR. LMC survey?

  • Competition: Spitzer, SOFIA, Herschel…