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Jodrell Bank Spectral Line Group

Welcome to the Jodrell Bank Spectral Line Group web page. We use radio lines to study the interstellar medium, circumstellar matter and the structure and dynamics of galaxies.

Jim Cohen 1948-2006. The order of service for Jim's memorial can be found here: Tribute to Jim and the obituary, published in the Telegraph, can be found here. We are storing as much material as possible relating to Jim's ongoing research collaborations, if you need more information you should contact Anita Richards ( Enquiries about other contacts such as with Jim's family should go to Tony Battilana (

Click for maser research 
MERLIN map of 22GHz water maser emission from IK Tan (Gonzalez 1996).

Cosmic Masers

Cosmic masers are very bright radio sources of great astrophysical significance. They can help us to understand the physical and chemical processes in regions of massive star formation and in the vicinity of post-AGB stars. We study masers at a range of frequencies using MERLIN and VLBI.

Research Areas
  • Circumstellar Water Masers
  • Mass-Loss from Red Giants
  • Protostellar Disks
  • Maser astrometry
  • Active Galaxies
  • Megamasers
  • Magnetic fields in Maser regions
  • Star Formation in the Universe
  • Circumstellar SiO Masers
Click for HI research 
The HI Cloud HIPASS J1712-64 - a gas cloud of neutral hydrogen with no stellar emission.

Neutral Hydrogen

Neutral Hydrogen (HI) is found in most galaxies, and is the main building block for star formation. We study HI in both emission and absorption.

Research Areas
  • HI in Active Galaxies
  • HI Absorption
  • Multibeam HI Surveys
  • Low Surface Brightness Galaxies
  • High Velocity Clouds
Last updated Mon Feb 19 16:10:42 2007

Maintained by Lisa Harvey-Smith