Galaxy Evolution with JWST Guaranteed Time Observations

*** Galaxy Evolution with JWST Guaranteed Time Observations ***

We invite applications for two postdoctoral positions to participate  in our 200-hour JWST guaranteed time program that will study galaxy  evolution from the Epoch of Reionization, through Cosmic Noon, and  down to intermediate redshifts.

Within the first year of JWST science operations, our “CANUCS”  Guaranteed Time Observer (GTO) program will use JWST’s NIRISS slitless  spectrograph to carry out a spatially-resolved slitless grism survey  of thousands of galaxies behind five massive z~0.5 lensing clusters.  These observations will produce maps of key physical quantities such  as stellar populations, ionized gas, metallicity, dust, etc. The  NIRISS slitless spectroscopy data will be supported by extensive  NIRCam imaging and subsequent multi-slit spectroscopic follow-up with  NIRSpec. The data will allow studies of galaxies from the Epoch of  Reionization, through the peak of cosmic star formation at z~2, and to  lower redshifts, including galaxies in the massive z~0.5 lensing  clusters. Additionally, we will in parallel also observe five offset  fields with NIRCam using 14 medium-band filters, giving a bonus  complementary imaging dataset of exquisite depth and resolution. For  more information on our guaranteed-time program,  see:

The postdoctoral fellows will be located at Saint Mary’s University in  Halifax, a major centre on the Atlantic coast of Canada that’s close  to nature and rich in history and culture. They will work within Dr.  Marcin Sawicki’s research group (,  which will consist of 4 postdoctoral fellows and several graduate  students embedded within the astronomy research ecosystem in the  Department of Astronomy and Physics and the Institute for  Computational Astrophysics. They will also interact closely with the  tight-knit CANUCS team located throughout Canada and beyond.

While the focus of the positions will be on the once-in-a-career JWST  GTO dataset, the fellows will also have time to carry out independent  research. They will also have opportunities (but no obligation) to  join in other key projects at Saint Mary’s University, such as in the  exploitation of our extremely deep-and-wide (~20 sq deg to ~27 mag)  Ugrizy dataset from the CLAUDS + HyperSuprimeCam (HSC) surveys  (, or the  development of the GIRMOS spectrograph  ( The fellows will also be  eligible to apply for Canadian observing time on JWST, Gemini, CFHT,  and ALMA, and to access High Performance Computing resources through  ACENET and Compute Canada.

The appointments are expected to start in September 2021 and will be  for up to three years, subject to satisfactory performance and the  availability of funds. We strongly encourage applications from all  qualified persons, including women, visible minorities, Aboriginal  people, and people with disabilities. We appreciate and welcome  diversity, and hire on the basis of merit.

All application materials should be submitted by 8 January 2021 via  email to  Applications should include a CV, a  statement of research interests and accomplishments, and a cover  letter, all as pdf files. Applicants should also arrange for three  referees to send reference letters directly to the same address by the  same date.

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