Staff profile
Overview
Dr Alex Riley
1851 Research Fellow

Affiliation |
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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 IVCasey, 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 300Fielder, 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 ReleaseValluri, 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 3Tan, 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 GalaxyCerny, 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 analoguesVienneau, 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 catalogueKoposov, 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 satellitesBrown, 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 SurveyKizhuprakkat, 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 WayOman, 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 DELVEAlfradique, 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 55McNanna, 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 SurveyCerny, 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