Year: 2026
Type: article
Abstract: DESI observational data for the GD-1 and C-19 streams are compared to stream simulations in an evolving multihalo potential of a Milky Way–like galaxy based on a cosmological Milky Way–like simulation. The number of subhalos decreases with time, and the subhalo-stream encounter velocities rise as the galaxy and its disk build up their mass. The streams develop from star clusters inserted at ≃1 Gyr after the Big Bang and evolved for 13 Gyr to their current orbital positions. The measured velocity widths of the streams are compared to the matched simulations. Streams in a cold dark matter (CDM) subhalo population provide the best match to the velocity width, on average, with considerable scatter. Streams younger than ≃12 Gyr in CDM subhalos are insufficiently hot. Streams in the same potentials but with populations of warm dark matter (WDM) 5.5 keV subhalos are not, on average, heated to the observed velocity widths, although some of the realizations do reach the observed levels. The stream density power spectrum measured along the length of the DESI GD-1 sample agrees with the CDM stream simulations, with 1.3–2.3 times more power than WDM 7 and 5.5 keV simulations. The simulations show that modeling specific streams from the time of the formation of their progenitor clusters is both feasible and necessary to reproduce their stream-averaged kinematic properties.
Source: The Astrophysical Journal
Authors: Raymond G. Carlberg, Ting S. Li, Emma Jarvis, Nasser Mohammed, Joan Najita, Arjun Dey, Sergey E. Koposov, Jakob Piafsky, Leandro Beraldo e Silva, Constance M. Rockosi, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, Biprateep Dey, P. Doel, A. Font-Ribera, J. E. Forero-Romero, Satya Gontcho A Gontcho, G. Gutierrez, R. Joyce, S. Juneau, A. Kremin, O. Lahav, M. Landriau, L. Le Guillou, A. Meisner, R. Miquel, W. J. Percival, C. Poppett, F. Prada, I. Pérez-Ràfols, G. Rossi, E. Sanchez, D. Schlegel, J. Silber, G. Tarlé, B. A. Weaver, R. Zhou, H. Zou
Institutions: University of Toronto, NSF NOIRLab, University of Edinburgh, National Observatory, Lawrence Berkeley National Laboratory, Boston University, University of Milan, Brera Astronomical Observatory, National Institute for Astrophysics, University College London, Universidad Nacional Autónoma de México, University of Pittsburgh, Institució Catalana de Recerca i Estudis Avançats, Institute for High Energy Physics, Universidad de Los Andes, University of Virginia, Fermi National Accelerator Laboratory, Centre National de la Recherche Scientifique, Sorbonne Université, Institut National de Physique Nucléaire et de Physique des Particules, University of Waterloo, Perimeter Institute, Consejo Superior de Investigaciones Científicas, Instituto de Astrofísica de Andalucía, Universitat Politècnica de Catalunya, Sejong University, Universidad Complutense de Madrid, University of Michigan, National Astronomical Observatories
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, U.S. Department of Energy, Gordon and Betty Moore Foundation, Ministerio de Ciencia, Innovación y Universidades, National Tsing Hua University, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, National Science and Technology Council, Office of Science, Science and Technology Facilities Council, Agencia Estatal de Investigación, Division of Astronomical Sciences
Awards: G1044631029, G1105844351, G1175115578, G1286236842, G1813527838, G1863003419, G2262748287, G294895050, G300979063, G3083819904, G3452655474, G3480869486, G419881185, G425668148, G42916606, G4501827968, G491712853, G498139845, G5080475149, G5635532810, G593054264, G6652958823, G6876926712, G7084143925, Management and Operations of the National Optical Astronomy Observatory, G7395345766, G7805626310, G7863371703, G8345352404, G8497050386, G8667377315, G969889393
OpenAlex ID: W7164880128
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