Professor Alis Deason's Outputs (6)

Dwarf stellar haloes: a powerful probe of small-scale galaxy formation and the nature of dark matter (2021)
Journal Article
Deason, A. J., Bose, S., Fattahi, A., Amorisco, N. C., Hellwing, W., & Frenk, C. S. (2022). Dwarf stellar haloes: a powerful probe of small-scale galaxy formation and the nature of dark matter. Monthly Notices of the Royal Astronomical Society, 511(3), 4044-4059. https://doi.org/10.1093/mnras/stab3524

We use N-body cosmological simulations and empirical galaxy models to study the merger history of dwarf-mass galaxies (with Mhalo∼1010M⊙⁠). Our input galaxy models describe the stellar mass–halo mass relation, and the galaxy occupation fraction. The... Read More about Dwarf stellar haloes: a powerful probe of small-scale galaxy formation and the nature of dark matter.

Star Formation Histories of Ultra-faint Dwarf Galaxies: Environmental Differences between Magellanic and Non-Magellanic Satellites?* (2021)
Journal Article
Sacchi, E., Richstein, H., Kallivayalil, N., van der Marel, R., Libralato, M., Zivick, P., Besla, G., Brown, T. M., Choi, Y., Deason, A., Fritz, T., Geha, M., Guhathakurta, P., Jeon, M., Kirby, E., Majewski, S. R., Patel, E., Simon, J. D., Tony Sohn, S., Tollerud, E., & Wetzel, A. (2021). Star Formation Histories of Ultra-faint Dwarf Galaxies: Environmental Differences between Magellanic and Non-Magellanic Satellites?*. Astrophysical Journal Letters, 920(1), Article L19. https://doi.org/10.3847/2041-8213/ac2aa3

We present the color–magnitude diagrams and star formation histories (SFHs) of seven ultra-faint dwarf galaxies: Horologium 1, Hydra 2, Phoenix 2, Reticulum 2, Sagittarius 2, Triangulum 2, and Tucana 2, derived from highprecision Hubble Space Telesco... Read More about Star Formation Histories of Ultra-faint Dwarf Galaxies: Environmental Differences between Magellanic and Non-Magellanic Satellites?*.

The survival of globular clusters in a cuspy Fornax (2021)
Journal Article
Shao, S., Cautun, M., Frenk, C. S., Reina-Campos, M., Deason, A. J., Crain, R. A., Kruijssen, J. D., & Pfeffer, J. (2021). The survival of globular clusters in a cuspy Fornax. Monthly Notices of the Royal Astronomical Society, 507(2), 2339-2353. https://doi.org/10.1093/mnras/stab2285

It has long been argued that the globular clusters (GCs) in the Fornax dwarf galaxy indicate that its dark matter halo is likely to have a shallow density profile with a core of size ∼1 kpc. We revisit this argument by investigating analogues of Forn... Read More about The survival of globular clusters in a cuspy Fornax.

Discovery of a possible splashback feature in the intracluster light of MACS J1149.5+2223 (2021)
Journal Article
Gonzalez, A. H., George, T., Connor, T., Deason, A., Donahue, M., Montes, M., Zabludoff, A. I., & Zaritsky, D. (2021). Discovery of a possible splashback feature in the intracluster light of MACS J1149.5+2223. Monthly Notices of the Royal Astronomical Society, 507(1), 963-970. https://doi.org/10.1093/mnras/stab2117

We present an analysis of the intracluster light (ICL) in the Frontier Field Cluster MACS J1149.5+2223 (z = 0.544), which combines new and archival Hubble WFC3/IR imaging to provide continuous radial coverage out to 2.8 Mpc from the brightest cluster... Read More about Discovery of a possible splashback feature in the intracluster light of MACS J1149.5+2223.

Detection of the LMC-induced sloshing of the Galactic halo (2021)
Journal Article
Erkal, D., Deason, A. J., Belokurov, V., Xue, X.-X., Koposov, S. E., Bird, S. A., Liu, C., Simion, I. T., Yang, C., Zhang, L., & Zhao, G. (2021). Detection of the LMC-induced sloshing of the Galactic halo. Monthly Notices of the Royal Astronomical Society, 506(2), 2677-2684. https://doi.org/10.1093/mnras/stab1828

A wealth of recent studies have shown that the LMC is likely massive, with a halo mass >1011M⊙. One consequence of having such a nearby and massive neighbour is that the inner Milky Way is expected to be accelerated with respect to our Galaxy’s outsk... Read More about Detection of the LMC-induced sloshing of the Galactic halo.

Space Telescope and Optical Reverberation Mapping Project. IX. Velocity–Delay Maps for Broad Emission Lines in NGC 5548 (2021)
Journal Article
Horne, K., Rosa, G. D., Peterson, B., Barth, A., Ely, J., Fausnaugh, M., Kriss, G., Pei, L., Bentz, M., Cackett, E., Edelson, R., Eracleous, M., Goad, M., Grier, C., Kaastra, J., Kochanek, C., Krongold, Y., Mathur, S., Netzer, H., Proga, D., …Zu, Y. (2021). Space Telescope and Optical Reverberation Mapping Project. IX. Velocity–Delay Maps for Broad Emission Lines in NGC 5548. Astrophysical Journal, 907(2), Article 76. https://doi.org/10.3847/1538-4357/abce60

In this contribution, we achieve the primary goal of the active galactic nucleus (AGN) STORM campaign by recovering velocity–delay maps for the prominent broad emission lines (Lyα, C iv, He ii, and Hβ) in the spectrum of NGC 5548. These are the most... Read More about Space Telescope and Optical Reverberation Mapping Project. IX. Velocity–Delay Maps for Broad Emission Lines in NGC 5548.