Pith. sign in

REVIEW 1 cited by

GD-1 Stellar Stream and Cocoon in the DESI Early Data Release

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2407.06336 v2 pith:NR5F6JZW submitted 2024-07-08 astro-ph.GA

GD-1 Stellar Stream and Cocoon in the DESI Early Data Release

Monica Valluri (1) , Parker Fagrelius (2) , Sergey. E. Koposov (3 , 8) , Ting S. Li (4) , Oleg Y. Gnedin (1) , Eric F. Bell (1) , Raymond G. Carlberg (4)
show 83 more authors
Andrew P. Cooper (5) Jessia N. Aguilar (6) Carlos Allende Prieto (7 27) Vasily Belokurov (8) Leandro Beraldo e Silva (9) David Brooks (10) Amanda Bystr\"om (3) Todd Claybaugh (6) Kyle Dawson (11) Arjun Dey (2) Peter Doel (10) Jaime E. Forero-Romero Enrique Gazta\~naga (13) Satya Gontcho A Gontcho (6) Klaus Honscheid (14) T . Kisner (6) Anthony Kremin (6) A. Lambert (6) Martin Landriau (6) L. Le Guillou (15) Michael E. Levi (6) Axel de la Macorra (16) Mark Manera (17) Paul Martini (14) Gustavo E. Medina (4) Aaron Meisner (2) Ramon Miquel (18) John Moustakas (19) Adam D. Myer (20) Joan Najita (2) Claire Poppett (21) Francisco Prada (22) Mehdi Rezaie (23) Graziano Rossi (24) Alex H. Riley (25) Eusebio Sanchez (26) David Schlegel (6) Michael Schubnell (1) David Sprayberry (2) Gregory Tarl\'e (1) Guillaume Thomas (27 7) Benjamin A. Weaver (2) Risa H. Wechsler (28) Rongpu Zhou (6) Hu Zou (for the DESI Collaboration (1) University of Michigan (2) NSF NoirLab (3) University of Edinburgh (4) University of Toronto (5) National Tsing Hua University (6) Lawrence Berkeley National Laboratory (7) Universidad de La Laguna (8) University of Cambridge (9) University of Arizona (10) University College London (11) The University of Utah (12) Universidad de los Andes (13) Institut d'Estudis Espacials de Catalunya (14) The Ohio State University (15) Sorbonne Universite (16) Universidad Nacional Autonoma de Mexico (17) Universitat Autonoma de Barcelona (18) Instituci\'o Catalana de Recerca i Estudis Avan\c{c}ats (19) Siena College (20) University of Wyoming (21) University of California Berkeley (22) Instituto de Astrof\'isica de Andaluc\'ia (CSIC) (23) Kansas State University (24) Sejong University Seoul (25) Durham University (26) CIEMAT Madrid (27) Instituto de Astrof\'isica de Canarias (28) Kavli Institute for Particle Astrophysics Cosmology Stanford University (29) National Astronomical Observatories Chinese Academy of Sciences)
This is my paper
classification astro-ph.GA
keywords cocoonstreamdesithindwarfgalaxygd-1tidal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
0 comments
read the original abstract

We present 115 new spectroscopically identified members of the GD-1 tidal stream observed with the 5000-fiber Dark Energy Spectroscopic Instrument (DESI). We confirm the existence of a ``cocoon'' which is a broad (FWHM~2.932 deg ~ 460 pc) and kinematically hot (velocity dispersion, sigma ~ 5-8 km/s) component that surrounds a narrower (FWHM~ 0.353 deg ~ 55) and colder (sigma = 3.09+/-0.76 km/s) thin stream component (based on a median per star velocity precision of 2.7 km/s). The cocoon extends over at least a 30 degree segment of the stream observed by DESI. The thin and cocoon components have similar mean values of [Fe/H]: -2.54+/- 0.04 dex and -2.47+/- 0.06 dex suggestive of a common origin. The data are consistent with the following scenarios for the origin of the cocoon. The progenitor of the GD-1 stream was an accreted globular cluster (GC) and: (a) the cocoon was produced by pre-accretion tidal stripping of the GC while it was still inside its parent dwarf galaxy; (b) the cocoon is debris from the parent dwarf galaxy; (c) an initially thin GC tidal stream was heated by impacts from dark subhalos in the Milky Way; (d) an initially thin GC stream was heated by a massive Sagittarius dwarf galaxy; or a combination of some these. Future DESI spectroscopy and detailed modeling may enable us to distinguish between these possible origins.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Constraints on the population level distribution of nearby Dark Matter halo shapes with extragalactic streams

    astro-ph.GA 2026-07 conditional novelty 5.5

    A gold subsample of 17 photometry-only extragalactic streams yields a mildly oblate dark-matter halo population with mean flattening μ_q ≈ 0.72 and scatter σ_q ≈ 0.34.