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Jim Geach

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Professor Jim Geach

ARCS, AFHEA, Professor of Astrophysics

 https://orcid.org/0000-0003-4964-4635
20072025

Research activity per year

Personal profile

Research interests

Galaxy formation and evolution

Overview

Jim Geach is a Royal Society University Research Fellow based in the Centre for Astrophysics Research, specialising in the field of galaxy formation and evolution. After gaining his Ph.D. from Durham University (2008), he held post-doctoral positions at Durham and McGill University in Montreal, where he held one of the first Banting Fellowships. His research focuses on the evolution of cold gas in galaxies, and the role of environment on galaxy evolution. Geach is regularly awarded observing time on major international telescopes, and he is one of the principle investigators of the VISTA-CFHT Stripe 82 Survey - one of the largest near-infrared extragalactic imaging surveys of its depth. As well as being involved in several major international collaborations, one of Geach's roles is as survey scientist for the revolutionary JCMT/SCUBA-2 Cosmology Legacy Survey.

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Collaborations and top research areas from the last five years

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  • The JWST Emission Line Survey (JELS): the sizes and merger fraction of star-forming galaxies during the Epoch of Reionization

    Stephenson, H. M. O., Stott, J. P., Pirie, C. A., Duncan, K. J., McLeod, D. J., Best, P. N., Brinch, M., Clausen, M., Cochrane, R. K., Dunlop, J. S., Flury, S. R., Geach, J. E., Hale, C. L., Ibar, E., Li, Z., Matthee, J., McLure, R. J., Ossa-Fuentes, L., Patrick, A. L. & Sobral, D. & 1 others, Swinbank, A. M., 31 Dec 2025, In: Monthly Notices of the Royal Astronomical Society. 544, 2, p. 1412-1431 20 p.

    Research output: Contribution to journal › Article › peer-review

    Open Access
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    2 Citations (Scopus)
    1 Downloads (Pure)

  • JWST Discovery of Warm Dust in the Circumgalactic Medium of the Makani Galaxy

    Veilleux, S., Shockley, S. D., Meléndez, M., Rupke, D. S. N., Coil, A. L., Diamond-Stanic, A. M., Geach, J. E., Hickox, R. C., Moustakas, J., Rudnick, G. H., Sell, P. H., Tremonti, C. A. & Cha, H., 1 Sept 2025, In: The Astrophysical Journal. 990, 1, 11 p., 57.

    Research output: Contribution to journal › Article › peer-review

    Open Access
    File
    6 Citations (Scopus)
    2 Downloads (Pure)

  • The JWST Emission-Line Survey: extending rest-optical narrow-band emission-line selection into the Epoch of Reionization

    Duncan, K. J., McLeod, D. J., Best, P. N., Pirie, C. A., Clausen, M., Cochrane, R. K., Dunlop, J. S., Flury, S. R., Geach, J. E., Grogin, N. A., Hale, C. L., Ibar, E., Kondapally, R., Li, Z., Matthee, J., McLure, R. J., Ossa-Fuentes, L., Patrick, A. L., Smail, I. & Sobral, D. & 3 others, Stephenson, H. M. O., Stott, J. P. & Swinbank, A. M., 2 Jul 2025, (E-pub ahead of print) In: Monthly Notices of the Royal Astronomical Society. 541, 2, p. 1329-1347 19 p.

    Research output: Contribution to journal › Article › peer-review

    Open Access
    File
    7 Citations (Scopus)
    3 Downloads (Pure)

  • The JWST Emission Line Survey (JELS): an untargeted search for H α emission line galaxies at z > 6 and their physical properties

    Pirie, C. A., Best, P. N., Duncan, K. J., McLeod, D. J., Cochrane, R. K., Clausen, M., Dunlop, J. S., Flury, S. R., Geach, J. E., Hale, C. L., Ibar, E., Kondapally, R., Li, Z., Matthee, J., McLure, R. J., Ossa-Fuentes, L., Patrick, A. L., Smail, I., Sobral, D. & Stephenson, H. M. O. & 2 others, Stott, J. P. & Swinbank, A. M., 23 Jun 2025, (E-pub ahead of print) In: Monthly Notices of the Royal Astronomical Society. 541, 2, p. 1348-1376 29 p.

    Research output: Contribution to journal › Article › peer-review

    Open Access
    File
    13 Citations (Scopus)
    11 Downloads (Pure)

  • Deep Ultraviolet, Emission-line Imaging of the Makani Galactic Wind

    Ha, T., Rupke, D. S. N., Caraker, S., Harper, J., Coil, A. L., Li, M., Tremonti, C. A., Diamond-Stanic, A. M., Geach, J. E., Hickox, R. C., Johnson, S. D., Leung, G. C. K., Moustakas, J., Perrotta, S., Rudnick, G. H., Sell, P. H. & Whalen, K. E., 10 Jun 2025, In: The Astrophysical Journal. 986, 1, p. 1-18 18 p., 87.

    Research output: Contribution to journal › Article › peer-review

    Open Access
    File
    7 Citations (Scopus)
    21 Downloads (Pure)
View all 151 research outputs