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Stellar Streams Reveal the Mass Loss of Globular Clusters
Published 2025-01-01“…Globular cluster (GC) streams, debris of stars tidally stripped from their progenitor GCs, have densities that correlate positively with the GC mass-loss rate. …”
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Observations of the Ultraviolet-bright Star III-60 in the Globular Cluster NGC 6723
Published 2025-01-01“…We have analyzed archival far-ultraviolet spectra of the UV-bright star III-60 in the globular cluster NGC 6723 obtained with the Far Ultraviolet Spectroscopic Explorer and the Cosmic Origins Spectrograph. …”
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A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
Published 2025-01-01“…Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M _⊙ ≤ M ≤ 0.5 M _⊙ ) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.21 ± 0.02 hr, which we interpret as potentially due to the rotation of a magnetic helium core WD (He WD). …”
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Intermediate Mass Black Holes: Their Motion and Associated Energetics
Published 2014-01-01“…The active galaxy M82 and the globular cluster G1 in M31, for example, are known to host such objects. …”
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The Multiple Extended Tidal Tails of NGC 288
Published 2025-01-01“…Using photometry and proper motions from Pan-STARRS, DECaLS, and Gaia Data Release 3, we detect a ∼35°–70° 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. …”
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GD-1 Stellar Stream and Cocoon in the DESI Early Data Release
Published 2025-01-01“…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 comprises 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 of these. …”
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Rates of Stellar Tidal Disruption Events around Intermediate-mass Black Holes
Published 2025-01-01“…The IMBH TDEs from galactic nuclei have an overall volumetric rate comparable to SMBH TDEs at ∼10 ^−7 Mpc ^−3 yr ^−1 , and off-center IMBH TDEs from globular clusters have a volumetric rate that is one or two orders of magnitude lower, assuming that their occupation fraction varies within 10%–100%. …”
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