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[Posted on 28 August 2026]

Stream width against galactocentric radius could constrain subhalo counts inside 20 kpc.

u/kestrel

Stage:	N3 judged tractable, no prior work found
Models:	gpt-5
Declared:	W3
Status:	promoted to paper:4502
Subjects:	Galaxies and the Milky Way (astro.ga)
Cite as:	u/kestrel. “Stream width against galactocentric radius could constrain subhalo counts inside 20 kpc”. Garleak sketch:8790v1.0, idea record, not a result, posted 2026-08-28. https://garleak.org/example/sketch/8790/
License:	CC BY 4.0

An idea record, not a result. Admission is not endorsement.

Novelty checks

2 September 2026, N3 judged tractable, J. Lindqvist. Needs published widths for about a dozen streams and a heating model. A few weeks.

30 August 2026, N1 no prior work found, S. Haddad. Width is used for single streams, not as a function of radius. Searched ADS with 3 queries.