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Title: Hidden depths in the local Universe: The Stellar Stream Legacy Survey

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [15];  [16];  [17];  [18];  [16];  [19] more »;  [20];  [16];  [16];  [21];  [22];  [22];  [23];  [24];  [22] « less
  1. Consejo Superior de Investigaciones Cientificas (CSIC), Granada (Spain). Instituto de Astrofísica de Andalucía; Heidelberg Univ. (Germany). Astronomical Calculation Institute
  2. National Tsing Hua Univ., Hsinchu (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
  3. Consejo Superior de Investigaciones Cientificas (CSIC), Granada (Spain). Instituto de Astrofísica de Andalucía; Instituto de Astrofísica de Canarias (IAC), Tenerife (Spain); Universidad de La Laguna, Tenerife (Spain)
  4. Max Planck Inst. fuer Astronomie, Heidelberg (Germany)
  5. Univ. of Surrey, Guildford (United Kingdom)
  6. New York Univ. (NYU), NY (United States)
  7. Siena College, Loudonville, NY (United States)
  8. Univ. of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI)
  9. California Institute of Technology (CalTech), Pasadena, CA (United States). Infrared Processing & Analysis Center (IPAC)
  10. Instituto de Astrofísica de Canarias (IAC), Tenerife (Spain); Universidad de La Laguna, Tenerife (Spain); Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Teruel (Spain)
  11. Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  12. Russian Academy of Sciences (RAS), Nizhnij Arkhyz (Russian Federation). Special Astrophysical Observatory
  13. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  14. Union of Italian Amateur Astronomers (UAI), Oria (Italy)
  15. National Centre for Nuclear Research, Warsaw (Poland)
  16. Complutense Univ. of Madrid (Spain)
  17. Univ. Paris-Saclay, Gif-sur-Yvette (France); Univ. of Paris (France); Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France); Centre National de la Recherche Scientifique (CNRS) (France)
  18. Univ. Autonoma de Barcelona (Spain). Institute of Space Sciences (ICE-CSIC)
  19. Durham Univ. (United Kingdom)
  20. Univ. of Maryland, College Park, MD (United States)
  21. Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam (Germany)
  22. Univ. of Arizona, Tucson, AZ (United States). National Optical-Infrared Astronomy Research Laboratory (NOIRLab)
  23. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  24. Univ. of Wyoming, Laramie, WY (United States)

Context. Mergers and tidal interactions between massive galaxies and their dwarf satellites are a fundamental prediction of the Lambda-cold dark matter cosmology. These events are thought to provide important observational diagnostics of non-linear structure formation. Stellar streams in the Milky Way and Andromeda are spectacular evidence for ongoing satellite disruption. However, constructing a statistically meaningful sample of tidal streams beyond the Local Group has proven a daunting observational challenge, and the full potential for deepening our understanding of galaxy assembly using stellar streams has yet to be realised. Aims. Here we introduce the Stellar Stream Legacy Survey, a systematic imaging survey of tidal features associated with dwarf galaxy accretion around a sample of ~3100 nearby galaxies within z~0.02, including about 940 Milky Way analogues. Methods. Our survey exploits public deep imaging data from the DESI Legacy Imaging Surveys, which reach surface brightness as faint as ~29 mag arcsec–2 in the r band. As a proof of concept of our survey, we report the detection and broad-band photometry of 24 new stellar streams in the local Universe. Results. We discuss how these observations can yield new constraints on galaxy formation theory through comparison to mock observations from cosmological galaxy simulations. These tests will probe the present-day mass assembly rate of galaxies, the stellar populations and orbits of satellites, the growth of stellar halos, and the resilience of stellar disks to satellite bombardment.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2228921
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 671; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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