Outputs (94)

Unmixing the Galactic Halo with RR Lyrae tagging (2018)
Journal Article
Belokurov, V., Deason, A., Koposov, S., Catelan, M., Erkal, D., Drake, A., & Evans, N. (2018). Unmixing the Galactic Halo with RR Lyrae tagging. Monthly Notices of the Royal Astronomical Society, 477(2), 1472-1483. https://doi.org/10.1093/mnras/sty615

We show that tagging RR Lyrae stars according to their location in the period-amplitude diagram can be used to shed light on the genesis of the Galactic stellar halo. The mixture of RR Lyrae of ab type, separated into classes along the lines suggeste... Read More about Unmixing the Galactic Halo with RR Lyrae tagging.

To the Galactic Virial Radius with Hyper Suprime-Cam (2018)
Journal Article
Deason, A. J., Belokurov, V., & Koposov, S. E. (2018). To the Galactic Virial Radius with Hyper Suprime-Cam. Astrophysical Journal, 852(2), Article 118. https://doi.org/10.3847/1538-4357/aa9d19

We exploit the exquisite, deep Hyper Suprime-Cam (HSC) imaging data to probe the Galactic halo out to 200 kpc. Using the ~100 square degree, multiband photometry of the first HSC Wide survey data release, we identify blue horizontal branch (BHB) star... Read More about To the Galactic Virial Radius with Hyper Suprime-Cam.

Cresting the wave: proper motions of the Eastern Banded Structure (2017)
Journal Article
Deason, A., Belokurov, V., & Koposo, V. S. (2018). Cresting the wave: proper motions of the Eastern Banded Structure. Monthly Notices of the Royal Astronomical Society, 473(2), 2428-2433. https://doi.org/10.1093/mnras/stx2528

We study the kinematic properties of the Eastern Banded Structure (EBS) and Hydra I overdensity using exquisite proper motions derived from the Sloan Digital Sky Survey (SDSS) and Gaia source catalogue. Main sequence turn-off stars in the vicinity of... Read More about Cresting the wave: proper motions of the Eastern Banded Structure.

Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy (2017)
Journal Article
Mathur, S., Gupta, A., Page, K., Pogge, R., Krongold, Y., Goad, M., …Zu, Y. (2017). Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy. Astrophysical Journal, 846(1), Article 55. https://doi.org/10.3847/1538-4357/aa832b

During the Space Telescope and Optical Reverberation Mapping Project observations of NGC 5548, the continuum and emission-line variability became decorrelated during the second half of the six-month-long observing campaign. Here we present Swift and... Read More about Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy.

The slight spin of the old stellar halo (2017)
Journal Article
Deason, A. J., Belokurov, V., Koposov, S. E., Gómez, F. A., Grand, R. J., Marinacci, F., & Pakmor, R. (2017). The slight spin of the old stellar halo. Monthly Notices of the Royal Astronomical Society, 470(2), 1259-1273. https://doi.org/10.1093/mnras/stx1301

We combine Gaia data release 1 astrometry with Sloan Digital Sky Survey (SDSS) images taken some ∼10–15 years earlier, to measure proper motions of stars in the halo of our Galaxy. The SDSS–Gaia proper motions have typical statistical errors of 2 mas... Read More about The slight spin of the old stellar halo.

Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548 (2017)
Journal Article
Pei, L., Fausnaugh, M., Barth, A., Peterson, B., Bentz, M., De Rosa, G., …Zu, Y. (2017). Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548. Astrophysical Journal, 837(2), Article 131. https://doi.org/10.3847/1538-4357/aa5eb1

We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multi-wavelength reverberation mapping campaign. The campaign spanned six months and achieved an almost daily cadence with observations from... Read More about Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548.

The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables (2017)
Journal Article
Deason, A., Belokurov, V., Erkal, D., Koposov, S., & Mackey, D. (2017). The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables. Monthly Notices of the Royal Astronomical Society, 467(3), 2636-2647. https://doi.org/10.1093/mnras/stx263

We exploit the first data release from the Gaia mission to identify candidate Mira variables in the outskirts of the Magellanic Clouds. The repeated observations of sources during the initial phase of the Gaia mission is used to identify stars that s... Read More about The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables.

Clouds, Streams and Bridges. Redrawing the blueprint of the Magellanic System with Gaia DR1 (2016)
Journal Article
Belokurov, V., Erkal, D., Deason, A., Koposov, S., De Angeli, F., Wyn Evans, D., …Mackey, D. (2016). Clouds, Streams and Bridges. Redrawing the blueprint of the Magellanic System with Gaia DR1. Monthly Notices of the Royal Astronomical Society, 466(4), 4711-4730. https://doi.org/10.1093/mnras/stw3357

We present the discovery of stellar tidal tails around the Large and the Small Magellanic Clouds (LMC and SMC, respectively) in the Gaia DR1 data. In between the Clouds, their tidal arms are stretched towards each other to form an almost continuous s... Read More about Clouds, Streams and Bridges. Redrawing the blueprint of the Magellanic System with Gaia DR1.

The Eating Habits of Milky Way-mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars (2016)
Journal Article
Deason, A., Mao, Y., & Wechsler, R. (2016). The Eating Habits of Milky Way-mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars. Astrophysical Journal, 821(1), Article 5. https://doi.org/10.3847/0004-637x/821/1/5

We study the mass spectrum of destroyed dwarfs that contribute to the accreted stellar mass of Milky Way (MW) mass M_vir ~ 10^12.1 M_sun) halos using a suite of 45 zoom-in, dissipationless simulations. Empirical models are employed to relate (peak) s... Read More about The Eating Habits of Milky Way-mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars.

Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31 (2016)
Journal Article
Cunningham, E., Deason, A., Guhathakurta, P., Rockosi, C., van der Marel, R., Toloba, E., …Dorman, C. (2016). Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31. Astrophysical Journal, 820(1), Article 18. https://doi.org/10.3847/0004-637x/820/1/18

We present the line-of-sight (LOS) velocities for 13 distant main sequence Milky Way halo stars with published proper motions. The proper motions were measured using long baseline (5-7 years) multi-epoch HST/ACS photometry, and the LOS velocities wer... Read More about Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31.