Zobrazeno 1 - 10
of 120
pro vyhledávání: '"stellar streams"'
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L4 (2024)
We search for globular clusters (GCs) trapped in resonances with the bar of the Milky Way (MW). By integrating their orbits in a potential with a decelerating bar, we select 10 whose orbits are significantly changed by its presence. Most of these are
Externí odkaz:
https://doaj.org/article/f9ff194c19d04f3e981f4a87a32cd195
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 135 (2024)
The dark matter subhalos orbiting in a galactic halo perturb the orbits of stars in thin stellar streams. Over time, the random velocities in the streams develop non-Gaussian wings. The rate of velocity increase is approximately a random walk at a ra
Externí odkaz:
https://doaj.org/article/1564a3d1cdd94fb783934b5c754fbee1
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 11 (2024)
The stellar shells surrounding an elliptical galaxy, as remnants of a dwarf galaxy disrupted during merging, reveal the distribution of energy and angular momentum of the progenitor dwarf galaxy. We develop a semi-analytical model to describe the cha
Externí odkaz:
https://doaj.org/article/fe67c276894b477eaa5d31200a8bb68d
Autor:
Arpit Arora, Nicolás Garavito-Camargo, Robyn E. Sanderson, Emily C. Cunningham, Andrew Wetzel, Nondh Panithanpaisal, Megan Barry
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 286 (2024)
Dark matter subhalos are predicted to perturb stellar streams; stream morphologies and dynamics can, therefore, constrain the mass distribution of subhalos. Using FIRE-2 simulations of Milky Way–mass galaxies, we demonstrate that the presence of an
Externí odkaz:
https://doaj.org/article/98cb8e32a6b04d48b96b5175d282ce3b
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 55 (2024)
Stellar streams are sensitive tracers of the gravitational potential, which is typically assumed to be static in the inner Galaxy. However, massive mergers like Gaia-Sausage-Enceladus can impart torques on the stellar disk of the Milky Way that resul
Externí odkaz:
https://doaj.org/article/9229498cb3424a5ea6d550a8605f0607
Autor:
Rodrigo Ibata, Khyati Malhan, Wassim Tenachi, Anke Ardern-Arentsen, Michele Bellazzini, Paolo Bianchini, Piercarlo Bonifacio, Elisabetta Caffau, Foivos Diakogiannis, Raphael Errani, Benoit Famaey, Salvatore Ferrone, Nicolas F. Martin, Paola di Matteo, Giacomo Monari, Florent Renaud, Else Starkenburg, Guillaume Thomas, Akshara Viswanathan, Zhen Yuan
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 2, p 89 (2024)
We present an atlas and follow-up spectroscopic observations of 87 thin stream-like structures detected with the STREAMFINDER algorithm in Gaia DR3, of which 28 are new discoveries. Here, we focus on using these streams to refine mass models of the G
Externí odkaz:
https://doaj.org/article/698a786ac5b444cb9aeb73c3a98c4b67
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 10 (2024)
Thanks to the precise astrometric measurements of proper motions by the Gaia mission, a new tidal stellar stream has been discovered in the northern hemisphere. The distribution of star count shows that the stream is approximately 80° long and 1.°7
Externí odkaz:
https://doaj.org/article/e642940643aa46cebde21f1e5f92d7d8
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:
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
Autor:
Seppo Laine, David Martínez-Delgado, Kristi A. Webb, Mohammad Akhlaghi, Roberto Baena-Gallé, Sanjaya Paudel, Michael Stein, Denis Erkal
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 111 (2024)
We have investigated the properties (e.g., age, metallicity) of the stellar populations of a ringlike tidal stellar stream (or streams) around the edge-on galaxy SPRC047 ( z = 0.031) using spectral energy distribution (SED) fits to int
Externí odkaz:
https://doaj.org/article/1af9aa85800946fca4c5555f2ae1ef93