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The Multiple Extended Tidal Tails of NGC 288
Carl J. Grillmair
Using photometry and proper motions from Pan-STARRS, DECaLS, and Gaia DR3, we detect a ~35 to 70 degree-long trailing stellar debris stream associated with the globular cluster NGC…
Joint Survey Processing II: Stellar Proper Motions in the COSMOS Field, from Hubble Space Telescope ACS and Subaru Telescope HSC Observations
Sergio B. Fajardo-Acosta, Andreas Faisst, Carl J. Grillmair +4
We analyze stellar proper motions in the COSMOS field to assess the presence of bulk motions. At bright magnitudes (G-band 18.5--20.76 AB), we use the proper motions of 1,010 stars…
The Extended Tidal Tails of NGC 7089 (M2)
Carl J. Grillmair
Using photometry and proper motions from Gaia Early Data Release 3, we detect a 45 degree-long trailing stellar debris stream associated with the old, metal-poor globular cluster N…
The Dark Matter Halo of M54
Raymond G. Carlberg, Carl J. Grillmair
M54 is a prototype of a globular cluster embedded in a dark matter halo. Gaia EDR3 photometry and proper motions separate the old, metal-poor stars from the more metal rich and you…
Estimate of the Mass and Radial Profile of the Orphan-Chenab Stream's Dwarf Galaxy Progenitor Using MilkyWay@home
Eric J. Mendelsohn, Heidi Jo Newberg, Siddhartha Shelton +3
We fit the mass and radial profile of the Orphan-Chenab Stream's (OCS) dwarf galaxy progenitor by using turnoff stars in the Sloan Digital Sky Survey (SDSS) and the Dark Energy Cam…
Testing for Dark Matter in the Outskirts of Globular Clusters
Raymond G. Carlberg, Carl J. Grillmair
The proper motions of stars in the outskirts of globular clusters are used to estimate cluster velocity dispersion profiles as far as possible within their tidal radii. We use indi…