Summary
Research Interests: I am an observational astronomer. I am primarily interested in discovering what is out there, and so I am interested in surveys, particularly for high-redshift quasars, and cool brown dwarfs. I am also interested in (strong) gravitational lensing, and quasar absorption lines.
Brief bio: I have been at Imperial since 1994. My first degree was in Engineering and I worked as a Civil Engineer for 6 yrs, specialising in Geotechnics. I did my PhD at the Institute of Astronomy, Cambridge, supervised by Paul Hewett, finishing in 1988, and then held a number of post-doc positions before moving to Imperial: a NATO Fellowship at Steward Observatory, Tucson, an ESO Fellowship at ESO Headquarters, Munich, and a Royal Society University Research Fellowship at Oxford. I was the Survey Scientist for the UKIRT Infrared Deep Sky Survey which finished in 2012. I was Head of Astrophysics at Imperial from 2010 to 2015.
Astronomers like the Astrophysics Data System, so I have provided a link to my publications on ADS.
Publications
Journals
O'Riordan CM, Warren SJ, Mortlock DJ, 2021, Galaxy mass profiles from strong lensing III: The two-dimensional broken power-law model, Monthly Notices of the Royal Astronomical Society, Vol:501, ISSN:0035-8711, Pages:3687-3694
Warren SJ, Ahmed S, Laithwaite RC, 2021, The local vertical density distribution of ultracool dwarfs M7 to L2.5 and their luminosity function, The Open Journal of Astrophysics, Vol:4, Pages:1-13
Barnett R, Warren SJ, Cross NJG, et al., 2020, A complete search for redshift z>6.5 quasars in the VIKING survey, Monthly Notices of the Royal Astronomical Society, Vol:501, ISSN:0035-8711, Pages:1663-1676
Laithwaite RC, Warren SJ, 2020, The absolute magnitudes $M_J$, the binary fraction, and the binary mass ratios of M7 to M9.5 dwarfs, Monthly Notices of the Royal Astronomical Society, Vol:499, ISSN:0035-8711, Pages:2587-2597
O’Riordan CM, Warren SJ, Mortlock DJ, 2020, Galaxy mass profiles from strong lensing II: The elliptical power-law model, Monthly Notices of the Royal Astronomical Society, Vol:496, ISSN:0035-8711, Pages:3424-3435