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Using deep photometric data from CFHT/Megacam, we study the morphology and density of the GD-1 stream, one of the longest and coldest stellar streams in the Milky Way. Our deep data recovers the lower main sequence of the stream with…

Astrophysics of Galaxies · Physics 2018-03-28 T. J. L. de Boer , V. Belokurov , S. E. Koposov , L. Ferrarese , D. Erkal , P. Cote , J. F. Navarro

We study three cosmological hydrodynamical simulations of Milky Way(MW)-sized halos including a comparison with the dark matter(DM)-only counterparts. We find one of our simulated galaxies with interesting MW-like features. Thanks to a…

Astrophysics of Galaxies · Physics 2015-06-19 Pol Mollitor , Emmanuel Nezri , Romain Teyssier

Stellar streams are sensitive probes of the Milky Way's gravitational potential. The mean track of a stream constrains global properties of the potential, while its fine-grained surface density constrains galactic substructure. A precise…

Astrophysics of Galaxies · Physics 2023-11-29 Nathaniel Starkman , Jacob Nibauer , Jo Bovy , Jeremy J. Webb , Kiyan Tavangar , Adrian Price-Whelan , Ana Bonaca

We utilize the DESI Legacy Imaging Surveys DR10 to investigate the previously undetected faint extension of the Palomar 5 stellar stream. By applying the HDBSCAN clustering algorithm, we identify stream members and successfully extend the…

Astrophysics of Galaxies · Physics 2025-04-15 Yun-Ao Xiao , Hu Zou , Lu Feng , Wei-Jian Guo , Niu Li , Wen-Xiong Li , Shu-Fei Liu , Gaurav Singh , Ji-Peng Sui , Jia-Li Wang , Sui-Jian Xue

We combine the six high-resolution Aquarius dark matter simulations with a semi-analytic galaxy formation model to investigate the properties of the satellites of Milky Way-like galaxies. We find good correspondence with the observed…

We use simulations of merging galaxies to explore the sensitivity of the morphology of tidal tails to variations of the halo mass distributions in the parent galaxies. Our goal is to constrain the mass of dark halos in well-known merging…

Astrophysics · Physics 2008-11-26 John Dubinski , J. Christopher Mihos , Lars Hernquist

We obtain predictions for the properties of cold dark matter annihilation radiation using high resolution hydrodynamic zoom-in cosmological simulations of Milky Way-like galaxies (APOSTLE project) carried out as part of the "Evolution and…

Stars that escape globular clusters form tidal tails that are predominantly shaped by the global distribution of mass in the Galaxy, but also preserve a historical record of small-scale perturbations. Using deep $grz$ photometry from…

We study the implications of galaxy formation on dark matter direct detection using high resolution hydrodynamic simulations of Milky Way-like galaxies simulated within the EAGLE and APOSTLE projects. We identify Milky Way analogues that…

We introduce a novel dynamical model, named empirical triaxial orbit-superposition model, for the Milky Way halo. This model relies on minimal physical assumptions that the system is stationary, meaning the distribution function in 6D…

Astrophysics of Galaxies · Physics 2025-11-05 Ling Zhu , Xiang-Xiang Xue , Shude Mao , Chengqun Yang , Lan Zhang

This paper presents an example where the morphology of a single stellar stream can be used to rule out a specific galactic potential form without the need for velocity information. We investigate the globular cluster Palomar5 (Pal 5), which…

Astrophysics of Galaxies · Physics 2016-04-01 Sarah Pearson , Andreas H. W. Küpper , Kathryn V. Johnston , Adrian M. Price-Whelan

As a result of their internal dynamical coherence, thin stellar streams formed by disrupting globular clusters (GCs) can act as detectors of dark matter (DM) substructure in the Galactic halo. Perturbations induced by close flybys amplify…

Astrophysics of Galaxies · Physics 2016-09-07 Nicola C. Amorisco , Facundo A. Gòmez , Simona Vegetti , Simon D. M. White

We introduce the ARTEMIS simulations, a new set of 42 zoomed-in, high-resolution (baryon particle mass of ~ 2x10^4 Msun/h), hydrodynamical simulations of galaxies residing in haloes of Milky Way mass, simulated with the EAGLE galaxy…

In the past decade, surveys of the stellar component of the Galaxy have revealed a number of streams from tidally disrupted dwarf galaxies and globular clusters. Simulations of hierarchical structure formation in LCDM cosmologies predict…

Astrophysics · Physics 2010-11-05 Jennifer M. Siegal-Gaskins , Monica Valluri

The coupling between the dark matter (DM) halo and the stellar disc is a key factor in galactic evolution. While the interaction between structures like the Galactic bar and DM halos has been explored (e.g. slowing down of the bar due to…

In this paper, we use hydrodynamic zoom-in simulations of Milky Way-type haloes to explore using dust as an observational tracer to discriminate between cold and warm dark matter (WDM) universes. Comparing a cold and 3.5 keV WDM particle…

Astrophysics of Galaxies · Physics 2024-10-28 Adam Ussing , Robert Mostoghiu Paun , Darren Croton , Celine Boehm , Alan Duffy , Chris Power

Traditional studies on stellar streams typically involve phenomenological $\Lambda$CDM halos or ad hoc dark matter (DM) profiles with different degrees of triaxiality, which preclude to gain insights into the nature and mass of the DM…

Astrophysics of Galaxies · Physics 2024-09-18 Martín F. Mestre , Carlos R. Argüelles , Daniel D. Carpintero , Valentina Crespi , Andreas Krut

Models for the formation and growth of structure in a cold dark matter dominated universe predict that galaxy halos should contain significant substructure. Studies of the Milky Way, however, have yet to identify the expected few hundred…

Astrophysics · Physics 2009-11-07 R. A. Ibata , G. F. Lewis , M. J. Irwin

In this paper, we present a holistic view of the detection, characterization, and origin of stellar streams in the disk of a simulated Milky Way-like galaxy. The star-by-star simulation of the Galaxy evolves stars born in clusters in a…

Astrophysics of Galaxies · Physics 2021-06-07 Harshil Kamdar , Charlie Conroy , Yuan-Sen Ting

We simulate tidal streams in the presence and absence of substructures inside the zero redshift snapshot of the Via Lactea II (VL-2) simulation. A halo finder is used to remove and isolate the subhalos found inside the high resolution dark…

Astrophysics of Galaxies · Physics 2015-06-23 Wayne Ngan , Brandon Bozek , Raymond G. Carlberg , Rosemary F. G. Wyse , Alexander S. Szalay , Piero Madau
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