The Multiple Extended Tidal Tails of NGC 288
arXiv:2409.17361 · doi:10.3847/1538-4357/ada2ea
Abstract
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 288. The trajectory of the trailing tail is not well matched by a model stream evolved in a static Galactic potential, but is reasonably well-matched by a stream modeled in a potential that incorporates a massive, infalling Large Magellanic Cloud. We also detect a broad, at least ~40 degree-long leading tail that appears to be composed of at least two narrower, spatially offset, and kinematically distinct streams. Stream modeling predicts a similar broad composite of streams and suggests that these narrower components could each be made up of one or more generations of tidal tails, each formed during different orbits over the past few gigayears. On the other hand, NGC 288 is believed to have been brought into the Galactic halo during the Gaia-Enceladus-Sausage accretion event, and the tangential velocity dispersions of our stream candidates are indeed most consistent with having been stripped in a parent galaxy that had a large, cored dark matter halo. Tables of the most highly ranked stream star candidates are provided for ongoing and future spectroscopic surveys.
15 pages, 6 figures, 4 tables. Revised version accepted for publication in the Astrophysical Journal. arXiv admin note: text overlap with arXiv:2203.04425
References in corpus (17)
- Gaia Data Release 3: Summary of the content and survey properties
- Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
- Gaia Data Release 3 Properties and validation of the radial velocities
- Globular Cluster Streams as Galactic High-Precision Scales - The Poster Child Palomar 5
- The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
- The Streams of the Gaping Abyss: A population of entangled stellar streams surrounding the Inner Galaxy
- All-Sky Dynamical Response of the Galactic Halo to the Large Magellanic Cloud
- Generation of mock tidal streams
- galstreams: A Library of Milky Way Stellar Stream Footprints and Tracks
- Dipping Our Toes in the Water: First Models of GD-1 as a Stream
- The eye of Gaia on globular clusters structure: tidal tails
- Inferring the gravitational potential of the Milky Way with a few precisely measured stars
- Development of multiple tidal tails around globular clusters and dwarf satellite galaxies
- On the extended stellar structure around NGC 288
- The Extended Tidal Tails of NGC 7089 (M2)
- New constraints on the dark matter density profiles of dwarf galaxies from proper motions of globular cluster streams
- The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272)