DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor

We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger—a galactic immigration event—in exquisite detail. Of the 11,416 sources studied in 3.75 hr of on-sky exposure time, 7438 are M31 sources with well-measured rad...

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Bibliographic Details

Published in:	The Astrophysical Journal
Main Authors:	Arjun Dey, Joan R. Najita, Sergey E. Koposov, J. Josephy-Zack, Gabriel Maxemin, Eric F. Bell, C. Poppett, E. Patel, L. Beraldo e Silva, A. Raichoor, D. Schlegel, D. Lang, A. Meisner, Adam D. Myers, J. Aguilar, S. Ahlen, C. Allende Prieto, D. Brooks, A. P. Cooper, K. S. Dawson, A. de la Macorra, P. Doel, A. Font-Ribera, Juan García-Bellido, S. Gontcho A Gontcho, J. Guy, K. Honscheid, R. Kehoe, T. Kisner, A. Kremin, M. Landriau, L. Le Guillou, Michael E. Levi, T. S. Li, Paul Martini, R. Miquel, J. Moustakas, Jundan Nie, N. Palanque-Delabrouille, F. Prada, E. F. Schlafly, Ray M. Sharples, Gregory Tarlé, Yuan-Sen Ting, L. Tyas, M. Valluri, Risa H. Wechsler, H. Zou
Format:	Article
Language:	English
Published:	IOP Publishing 2023-01-01
Subjects:	Andromeda Galaxy Galaxy mergers Galaxy evolution Galaxy dynamics Stellar kinematics Redshift surveys
Online Access:	https://doi.org/10.3847/1538-4357/aca5f8