https://salmanhiro.github.io/tags/desi/DESIHugo Blox Builder (https://hugoblox.com)en-usWed, 24 Jun 2026 00:00:00 +0000https://salmanhiro.github.io/media/icon_hu5823104125410023470.pnghttps://salmanhiro.github.io/tags/desi/https://salmanhiro.github.io/project/mockstream/Wed, 24 Jun 2026 00:00:00 +0000https://salmanhiro.github.io/project/mockstream/<p>Stellar tidal streams — ribbons of stars stripped from globular clusters and dwarf galaxies by the Milky Way&rsquo;s tidal field — encode the history of the Galaxy&rsquo;s accretion events and the shape of its gravitational potential. This research uses the <strong>particle-spray (Mock Stream) algorithm</strong> to generate fast, N-body-free synthetic stream tracks and searches for their counterparts across the DESI Legacy Survey (DESI LS) footprint.</p> <p>By forward-modeling stream morphology across a grid of progenitor orbits and matching mock tracks to stellar density maps built from DESI LS photometry, the pipeline recovers multiple tidal stream candidates over a wide area of sky.</p> <p>A key result is the orbital connection between the <strong>LMS-1 stream</strong> and associated globular clusters, shedding light on the origin and accretion history of this substructure. The analysis suggests that several globular clusters share a common progenitor with LMS-1, pointing to an accreted dwarf galaxy origin.</p> <h2 id="approach">Approach</h2> <ul> <li>Generate mock stream tracks with the particle-spray method over a grid of progenitor orbital parameters and Galactic potential models.</li> <li>Build stellar density maps from DESI LS photometry using color–magnitude diagram filtering to isolate old, metal-poor populations consistent with tidal debris.</li> <li>Match mock tracks to the data and score candidates to identify statistically significant stream detections.</li> <li>Trace recovered streams back to known substructures, including LMS-1 and its associated globular cluster system.</li> </ul>