Zobrazeno 1 - 10
of 164
pro vyhledávání: '"Kathryn V. Johnston"'
Autor:
Emily C. Cunningham, Jason A. S. Hunt, Adrian M. Price-Whelan, Kathryn V. Johnston, Melissa K. Ness, Yuxi (Lucy) Lu, Ivanna Escala, Ioana A. Stelea
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 2, p 95 (2024)
The stellar stream connected to the Sagittarius (Sgr) dwarf galaxy is the most massive tidal stream that has been mapped in the Galaxy, and is the dominant contributor to the outer stellar halo of the Milky Way (MW). We present metallicity maps of th
Externí odkaz:
https://doaj.org/article/88cd17b25ac3497ea0c88ac466f617a3
Autor:
Danny Horta, Adrian M. Price-Whelan, David W. Hogg, Kathryn V. Johnston, Lawrence Widrow, Julianne J. Dalcanton, Melissa K. Ness, Jason A. S. Hunt
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 165 (2024)
Under the assumption of a simple and time-invariant gravitational potential, many Galactic dynamics techniques infer the milky Way’s mass and dark matter distributions from stellar kinematic observations. These methods typically rely on parameteriz
Externí odkaz:
https://doaj.org/article/fc4c1d904b3c4e8489580edf98260966
Autor:
Christian Aganze, Sarah Pearson, Tjitske Starkenburg, Gabriella Contardo, Kathryn V. Johnston, Kiyan Tavangar, Adrian M. Price-Whelan, Adam J. Burgasser
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 151 (2024)
Stellar streams form through the tidal disruption of satellite galaxies or globular clusters orbiting a host galaxy. Globular cluster streams are exciting since they are thin (dynamically cold) and therefore sensitive to perturbations from low-mass s
Externí odkaz:
https://doaj.org/article/94d6be4a239d4fdcbb6d947494699ea6
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 1, p 74 (2023)
The recent discovery of a spiral pattern in the vertical kinematic structure in the solar neighborhood provides a prime opportunity to study nonequilibrium dynamics in the Milky Way from local stellar kinematics. Furthermore, results from simulations
Externí odkaz:
https://doaj.org/article/69e8a61d51614b56ae7dcdb79289fe0e
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 215 (2023)
Recent observations have revealed a trove of unexpected morphological features in many of the Milky Way’s stellar streams. Explanations for such features include time-dependent deformations of the Galactic gravitational potential, local disruptions
Externí odkaz:
https://doaj.org/article/065eb5bd51564bc8bb8e1976ad340f4f
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 195 (2023)
The positions and velocities of stellar streams have been used to constrain the mass and shape of the Milky Way's dark matter halo. Several extragalactic streams have already been detected, though it has remained unclear what can be inferred about th
Externí odkaz:
https://doaj.org/article/95acf0dfce9443068eadd35e87c8ab19
Autor:
Danny Horta, Emily C. Cunningham, Robyn E. Sanderson, Kathryn V. Johnston, Nondh Panithanpaisal, Arpit Arora, Lina Necib, Andrew Wetzel, Jeremy Bailin, Claude-André Faucher-Giguère
Publikováno v:
The Astrophysical Journal, Vol 943, Iss 2, p 158 (2023)
In the Λ-Cold Dark Matter model of the universe, galaxies form in part through accreting satellite systems. Previous works have built an understanding of the signatures of these processes contained within galactic stellar halos. This work revisits t
Externí odkaz:
https://doaj.org/article/c06db9bff245475796a2fae6c8e7fd16
Autor:
Sarah Pearson, Susan E. Clark, Alexis J. Demirjian, Kathryn V. Johnston, Melissa K. Ness, Tjitske K. Starkenburg, Benjamin F. Williams, Rodrigo A. Ibata
Publikováno v:
The Astrophysical Journal, Vol 926, Iss 2, p 166 (2022)
Stellar streams from globular clusters (GCs) offer constraints on the nature of dark matter and have been used to explore the dark matter halo structure and substructure of our Galaxy. Detection of GC streams in other galaxies would broaden this ende
Externí odkaz:
https://doaj.org/article/cb46b311bbd44a60b772ccaaa45f9c8e
Autor:
Kathryn V. Johnston, Adrian M. Price-Whelan, Maria Bergemann, Chervin Laporte, Ting S. Li, Allyson A. Sheffield, Steven R. Majewski, Rachael S. Beaton, Branimir Sesar, Sanjib Sharma
Publikováno v:
Galaxies, Vol 5, Iss 3, p 44 (2017)
Deep photometric surveys of the Milky Way have revealed diffuse structures encircling our Galaxy far beyond the “classical” limits of the stellar disk. This paper reviews results from our own and other observational programs, which together sugge
Externí odkaz:
https://doaj.org/article/7a2b53fb58e14bb992747ce37b3d39d3
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 521:1757-1774
Studying coupling between different galactic components is a challenging problem in galactic dynamics. Using basis function expansions (BFEs) and multichannel singular spectrum analysis (mSSA) as a means of dynamical data mining, we discover evidence