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Overview

Dr Alex Riley

1851 Research Fellow


Affiliations
Affiliation
1851 Research Fellow in the Department of Physics
Researcher in the Institute for Computational Cosmology

Publications

Journal Article

  • Deep Photometric Observations of Ultrafaint Milky Way Satellites Centaurus I and Eridanus IV
    Casey, Q. O., Mutlu-Pakdil, B., Sand, D. J., Pace, A. B., Crnojević, D., Doliva-Dolinsky, A., Cerny, W., Heiger, M. E., Riley, A. H., Ji, A. P., Limberg, G., Marin, L., Martínez-Vázquez, C. E., Medina, G. E., Li, T. S., Campana, S. N., Chaturvedi, A., Sakowska, J. D., Zenteno, A., … Bom, C. R. (2025). Deep Photometric Observations of Ultrafaint Milky Way Satellites Centaurus I and Eridanus IV. The Astrophysical Journal, 984(2), Article 148. https://doi.org/10.3847/1538-4357/adc67e
  • Streams, Shells, and Substructures in the Accretion-built Stellar Halo of NGC 300
    Fielder, C. E., Sand, D. J., Jones, M. G., Crnojević, D., Drlica-Wagner, A., Bennet, P., Carlin, J. L., Cerny, W., Doliva-Dolinsky, A., Hunter, L. C., Karunakaran, A., Limberg, G., Mutlu-Pakdil, B., Pace, A. B., Pearson, S., Smercina, A., Spekkens, K., Starkenburg, T., Strader, J., … Vivas, K. (2025). Streams, Shells, and Substructures in the Accretion-built Stellar Halo of NGC 300. Astrophysical Journal Letters, 982(2), Article L41. https://doi.org/10.3847/2041-8213/adbf17
  • GD-1 Stellar Stream and Cocoon in the DESI Early Data Release
    Valluri, M., Fagrelius, P., Koposov, S. E., Li, T. S., Gnedin, O. Y., Bell, E. F., Carlberg, R. G., Cooper, A. P., Aguilar, J., Ahlen, S., Allende Prieto, C., Belokurov, V., Beraldo e Silva, L., Brooks, Byström, A., Claybaugh, T., Dawson, Dey, A., Doel, … Zou. (2025). GD-1 Stellar Stream and Cocoon in the DESI Early Data Release. Astrophysical Journal, 980(1), Article 71. https://doi.org/10.3847/1538-4357/ada690
  • A Pride of Satellites in the Constellation Leo? Discovery of the Leo VI Milky Way Satellite Ultra-faint Dwarf Galaxy with DELVE Early Data Release 3
    Tan, C. Y., Cerny, W., Drlica-Wagner, A., Pace, A. B., Geha, M., Ji, A. P., Li, T. S., Adamów, M., Anbajagane, D., Bom, C. R., Carballo-Bello, J. A., Carlin, J. L., Chang, C., Chaturvedi, A., Chiti, A., Choi, Y., Collins, M. L., Doliva-Dolinsky, A., Ferguson, P. S., … Vivas, A. K. (2025). A Pride of Satellites in the Constellation Leo? Discovery of the Leo VI Milky Way Satellite Ultra-faint Dwarf Galaxy with DELVE Early Data Release 3. Astrophysical Journal, 979(2), Article 176. https://doi.org/10.3847/1538-4357/ad9b0c
  • Discovery and Spectroscopic Confirmation of Aquarius III: A Low-mass Milky Way Satellite Galaxy
    Cerny, W., Chiti, A., Geha, M., Mutlu-Pakdil, B., Drlica-Wagner, A., Tan, C. Y., Adamów, M., Pace, A. B., Simon, J. D., Sand, D. J., Ji, A. P., Li, T. S., Vivas, A. K., Bell, E. F., Carlin, J. L., Carballo-Bello, J. A., Chaturvedi, A., Choi, Y., Doliva-Dolinsky, A., … Tollerud, E. J. (2025). Discovery and Spectroscopic Confirmation of Aquarius III: A Low-mass Milky Way Satellite Galaxy. Astrophysical Journal, 979(2), Article 164. https://doi.org/10.3847/1538-4357/ad8eba
  • Significant impact of Galactic dark matter particles on annihilation signals from Sagittarius analogues
    Vienneau, E., Evans, A. J., Hartl, O. V., Bozorgnia, N., Strigari, L. E., Riley, A. H., & Shipp, N. (2024). Significant impact of Galactic dark matter particles on annihilation signals from Sagittarius analogues. Journal of Cosmology and Astroparticle Physics, 2024(10), Article 019. https://doi.org/10.1088/1475-7516/2024/10/019
  • DESI Early Data Release Milky Way Survey value-added catalogue
    Koposov, S. E., Allende Prieto, C., Cooper, A. P., Li, T. S., Beraldo e Silva, L., Kim, B., Carrillo, A., Dey, A., Manser, C. J., Nikakhtar, F., Riley, A. H., Rockosi, C., Valluri, M., Aguilar, J., Ahlen, S., Bailey, S., Blum, R., Brooks, D., Claybaugh, T., … Zhou, Z. (2024). DESI Early Data Release Milky Way Survey value-added catalogue. Monthly Notices of the Royal Astronomical Society, 533(1), 1012-1031. https://doi.org/10.1093/mnras/stae1842
  • ARTEMIS emulator: exploring the effect of cosmology and galaxy formation physics on Milky Way-mass haloes and their satellites
    Brown, S. T., Fattahi, A., McCarthy, I. G., Font, A. S., Oman, K. A., & Riley, A. H. (2024). ARTEMIS emulator: exploring the effect of cosmology and galaxy formation physics on Milky Way-mass haloes and their satellites. Monthly Notices of the Royal Astronomical Society, 532(2), 1223-1240. https://doi.org/10.1093/mnras/stae1378
  • AuriDESI: mock catalogues for the DESI Milky Way Survey
    Kizhuprakkat, N., Cooper, A. P., Riley, A. H., Koposov, S. E., Aguilar, J. N., Ahlen, S., Allende Prieto, C., Brooks, D., Claybaugh, T., Dawson, K., de la Macorra, A., Doel, P., Forero-Romero, J. E., Frenk, C., Gaztañaga, E., Gnedin, O. Y., Grand, R. J. J., Gontcho A Gontcho, S., Honscheid, K., … Zhou, Z. (2024). AuriDESI: mock catalogues for the DESI Milky Way Survey. Monthly Notices of the Royal Astronomical Society, 531(4), 4108-4137. https://doi.org/10.1093/mnras/stae1415
  • An overlooked source of uncertainty in the mass of the Milky Way
    Oman, K. A., & Riley, A. H. (2024). An overlooked source of uncertainty in the mass of the Milky Way. Monthly Notices of the Royal Astronomical Society: Letters, 532(1), L48-L55. https://doi.org/10.1093/mnrasl/slae042
  • A dark siren measurement of the Hubble constant using gravitational wave events from the first three LIGO/Virgo observing runs and DELVE
    Alfradique, V., Bom, C. R., Palmese, A., Teixeira, G., Santana-Silva, L., Drlica-Wagner, A., Riley, A. H., Martínez-Vázquez, C. E., Sand, D. J., Stringfellow, G. S., Medina, G. E., Carballo-Bello, J. A., Choi, Y., Esteves, J., Limberg, G., Mutlu-Pakdil, B., Noël, N. E. D., Pace, A. B., Sakowska, J. D., & Wu, J. F. (2024). A dark siren measurement of the Hubble constant using gravitational wave events from the first three LIGO/Virgo observing runs and DELVE. Monthly Notices of the Royal Astronomical Society, 528(2), 3249-3259. https://doi.org/10.1093/mnras/stae086
  • A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55
    McNanna, M., Bechtol, K., Mau, S., Nadler, E. O., Medoff, J., Drlica-Wagner, A., Cerny, W., Crnojević, D., Mutlu-Pakdıl, B., Vivas, A. K., Pace, A. B., Carlin, J. L., Collins, M. L. M., Ferguson, P. S., Martínez-Delgado, D., Martínez-Vázquez, C. E., Noel, N. E. D., Riley, A. H., Sand, D. J., … Wiseman, P. (2024). A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55. The Astrophysical Journal, 961(1), Article 126. https://doi.org/10.3847/1538-4357/ad07d0
  • Six More Ultra-faint Milky Way Companions Discovered in the DECam Local Volume Exploration Survey
    Cerny, W., Martínez-Vázquez, C. E., Drlica-Wagner, A., Pace, A. B., Mutlu-Pakdil, B., Li, T. S., Riley, A. H., Crnojević, D., Bom, C. R., Carballo-Bello, J. A., Carlin, J. L., Chiti, A., Choi, Y., Collins, M. L. M., Darragh-Ford, E., Ferguson, P. S., Geha, M., Martínez-Delgado, D., Massana, P., … Wechsler, R. H. (2023). Six More Ultra-faint Milky Way Companions Discovered in the DECam Local Volume Exploration Survey. The Astrophysical Journal, 953(1), Article 1. https://doi.org/10.3847/1538-4357/acdd78