Research Keywords


  • Astromineralogy
  • Formation and evolution of dust in galaxies
  • Mass loss from post-main-sequence stars
  • Gas and dust in the interstellar medium
  • Dust in AGN, quasars, starburst galaxies and the early universe
  • Infrared and submillimeter astronomy

SAGE-LMC and SAGE-Spec: Spitzer surveys of the Large Magellanic Cloud

Using the Spitzer Space Telescope, the SAGE consortium led by Margaret Meixner has mapped the Large Magellanic Cloud using all bands of the IRAC and MIPS instruments. The data form part of the Spitzer legacy, and provide a full infrared survey of this nearby galaxy. Millions of new point sources have been detected, and the extended emission has been investigated with unprecedented detail. As a follow-up to this project, spectroscopy of many of the newly discovered targets and extended structures was planned with Spitzer. I am playing a leading role in this follow-up Legacy Program, entitled SAGE-Spec.


In the figure on the right hand side, all point sources in the SAGE MIPS/IRAC point source catalogue which are detected at 8.0 and 24 micron are indicated with black dots. Overlayed is the sample of sources identified for spectroscopic follow-up. The coloured dots indicate the various types of point sources selected for follow-up with SAGE-Spec using IRS spectroscopy. The grey coloured dots indicated sources already observed with Spitzer IRS, before cycle 4. These are prior known sources, predominantly detected using MSX – the bright red line indicates the MSX detection limit – or Planetary Nebulae with strong optical counterparts. These existing spectra will become part of the SAGE-Spec legacy as well.
Extended regions are observed in IRS mapping mode, and MIPS SED maps are obtained as well. Point sources for which IRS observations exist or are observed in SAGE-Spec, and that are sufficiently bright at 70 microns are also observed with MIPS SED.

Current group members

  • since 01/2013: Naslim N., post-doc (ASIAA)
  • since 11/2012: Sundar Srinivasan, post-doc (ASIAA)
  • since 08/2012: Ji Yeon Seok, post-doc (ASIAA)
  • since 12/2011: Alfonso Trejo, post-doc (ASIAA)
  • since 07/2011: Mei-Chun Lin, M.Sc. student (NTU/ASIAA)
  • since 10/2013: Thomas Lai, research assistant (ASIAA)
  • since 06/2014: Rita Peng, research assistant (ASIAA)

Past group members

  • 2011 – 2014: Masaaki Otsuka, post-doc (ASIAA)
  • 2012 – 2013: Ronny Zhao-Geisler, post-doc (ASIAA)
  • 2011 – 2013: Paul Ruffle, post-doc (Manchester)
  • 2008 – 2011: Paul Woods, post-doc (Manchester)
  • 2009 – 2013: Libby Jones, Ph.D. student (Manchester)
  • 2009 – 2012: Sean Chapman, Ph.D. student (Manchester/ASIAA)
  • 2005 – 2007: Jarron Leisenring, Ph.D. student (Virginia)
  • 2005 – 2007: Gail Zasowski, Ph.D. student (Virginia)
  • 2005: Sabrina Pakzad, Ph.D. student (Virginia)
  • 2008 – 2010: Catherine McGuire, M.Sc. student (Manchester)
  • 2007 – 2009: Liz Sibbons, M.Sc. student (Manchester)
  • 2008 – 2009: Antonio Pasqua, M.Sc. student (Manchester)
  • 2007 – 2008: Parin Tanawong, M.Sc. student (Manchester)
  • 2011 – 2012: Yao-Lun Yang, undergraduate student (NTU/ASIAA)
  • 2013: Ben Ling, summer student (ASIAA/Toronto)