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Article . 2020
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https://doi.org/10.48550/arxiv...
Article . 2019
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The Ophiuchus stream progenitor: a new type of globular cluster and its possible Sagittarius connection

A new type of globular cluster and its possible Sagittarius connection
Authors: James M. M. Lane; Julio F. Navarro; Azadeh Fattahi; Kyle A. Oman; Jo Bovy;

The Ophiuchus stream progenitor: a new type of globular cluster and its possible Sagittarius connection

Abstract

The Ophiuchus stream is a short arc-like stellar feature of uncertain origin located $\sim 5$ kpc North of the Galactic centre. New proper motions from the second $Gaia$ data release reconcile the direction of motion of stream members with the stream arc, resolving a puzzling mismatch reported in earlier work. We use N-body simulations to show that the stream is likely only on its second pericentric passage, and thus was formed recently. The simulations suggest that the entire disrupted progenitor is visible in the observed stream today, and that little further tidal debris lies beyond the ends of the stream. The luminosity, length, width, and velocity dispersion of the stream suggest a globular cluster (GC) progenitor substantially fainter and of lower surface brightness than estimated in previous work, and unlike any other known globulars in the Galaxy. This result suggests the existence of clusters that would extend the known GC population to fainter and more weakly bound systems than hitherto known. How such a weakly-bound cluster of old stars survived until it was disrupted so recently, however, remains a mystery. Integrating backwards in time, we find that the orbits of Sagittarius and Ophiuchus passed within $\sim 5$ kpc of each other about $\sim 100$ Myrs ago, an interaction that might help resolve this puzzle.

Comment: 11 pages, 7 figures, submitted to MNRAS

Countries
Netherlands, United Kingdom
Subjects by Vocabulary

Microsoft Academic Graph classification: Population Astrophysics Galactic halo Galaxy formation and evolution Surface brightness education Physics education.field_of_study Velocity dispersion Galaxy Globular cluster Ophiuchus

Keywords

MODELS, FOS: Physical sciences, globular clusters: general, GALACTIC BAR, OUTER LINDBLAD RESONANCE, MASSES, Galaxy: structure, Galaxy: evolution, PARSEC EVOLUTIONARY TRACKS, Astronomy and Astrophysics, galaxies: dwarf, Astrophysics - Astrophysics of Galaxies, Galaxy: halo, STELLAR EVOLUTION, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Galaxy: kinematics and dynamics, MASSIVE STARS, SYSTEM

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    influence
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    4
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Top 10%
Average
Average
Funded by
EC| DMIDAS
Project
DMIDAS
Astrophysical constraints on the identity of the dark matter
  • Funder: European Commission (EC)
  • Project Code: 786910
  • Funding stream: H2020 | ERC | ERC-ADG
Validated by funder
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