The Ghost of Sagittarius and Lumps in the Halo of the Milky Way

@article{Newberg2002TheGO,
  title={The Ghost of Sagittarius and Lumps in the Halo of the Milky Way},
  author={Heidi Jo Newberg and Brian Yanny and Constance M. Rockosi and Eva K. Grebel and Hans-Walter Rix and Jonathan V. Brinkmann and Istv{\'a}n Csabai and Gregory S. Hennessy and Robert B. Hindsley and Rodrigo A. Ibata and Željko Ivezi{\'c} and Donald Q. Lamb and E. Thomas Nash and Michael Odenkirchen and Heather A. Rave and Donald P. Schneider and J. Allyn Smith and Andrea Stolte and Donald G. York},
  journal={The Astrophysical Journal},
  year={2002},
  volume={569},
  pages={245-274}
}
We identify new structures in the halo of the Milky Way from positions, colors, and magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these stars are within 126 of the celestial equator. We present color-magnitude diagrams (CMDs) for stars in two previously discovered, tidally disrupted structures. The CMDs and turnoff colors are consistent with those of the Sagittarius dwarf galaxy, as had been predicted. In one direction, we are even able to detect a clump of… 

Tables from this paper

The Overdensity in Virgo, Sagittarius Debris, and the Asymmetric Spheroid
We investigate the relationship between several previously identified Galactic halo stellar structures in the direction of Virgo using imaging and spectroscopic observations of F turnoff stars and
Sagittarius Tidal Debris 90 Kiloparsecs from the Galactic Center
A new overdensity of A-colored stars in distant parts of the Milky Way's stellar halo, at a dereddened Sloan Digital Sky Survey magnitude of g0 = 20.3, is presented. Identification of associated
A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way
TLDR
An analysis of the asymmetries in the population of Galactic M-giant stars present in the 2MASS All Sky catalogue suggests that the Canis Major dwarf galaxy is a building block of the Galactic thick disk, that the thick disk is continually growing, even up to the present time, and that thick disk globular clusters were accreted onto the Milky Way from dwarf galaxies in co-planar orbits.
Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables
We assemble 121 spectroscopically-confirmed halo carbon stars, drawn from the literature, exhibiting measurable variability in the Catalina Surveys. We present their periods and amplitudes, which are
The influence of Sagittarius and the Large Magellanic Cloud on the stellar disc of the Milky Way Galaxy
We present N-body simulations of a Sagittarius-like dwarf spheroidal galaxy (Sgr) that follow its orbit about the Milky Way (MW) since its first crossing of the Galaxy's virial radius to the present
The Virgo Stellar Overdensity: Mapping the Infall of the Sagittarius Tidal Stream onto the Milky Way Disk
The recently discovered Virgo stellar overdensity, which extends over ~1000 deg2 perpendicular to the Galactic disk plane (7 kpc < Z < 15 kpc, R ~ 7 kpc), is the largest clump of tidal debris ever
Stellar Over-Densities in the Outer Halo of the Milky Way
  • S. Keller
  • Physics
    Publications of the Astronomical Society of Australia
  • 2010
Abstract This study presents a tomographic survey of a subset of the outer halo (10–40 kpc) drawn from the Sloan Digital Sky Survey Data Release 6. Halo substructure on spatial scales of >3 degrees
Building Up the Globular Cluster System of the Milky Way: The Contribution of the Sagittarius Galaxy
We demonstrate that there is a clear statistical correlation between the (X, Y, Z, Vr) phase-space distribution of the outer halo Galactic globular clusters (having 10 kpc ≤ RGC ≤ 40 kpc) and the
The Dog on the Ship: The Canis Major Dwarf Galaxy as an Outlying Part of the Argo Star System
Overdensities in the distribution of low-latitude, 2MASS giant stars are revealed by systematically peeling away from sky maps the bulk of the giant stars conforming to "isotropic" density laws
INSIGHT INTO THE FORMATION OF THE MILKY WAY THROUGH COLD HALO SUBSTRUCTURE. III. STATISTICAL CHEMICAL TAGGING IN THE SMOOTH HALO
We find that the relative contribution of satellite galaxies accreted at high redshift to the stellar population of the Milky Way's smooth halo increases with distance, becoming observable relative
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 59 REFERENCES
The Disruption of the Sagittarius Dwarf Galaxy.
Numerical simulations of dwarf spheroidal galaxies undergoing several close encounters with the Milky Way are described. By comparing our models to observed properties of the recently discovered
A dwarf satellite galaxy in Sagittarius
WE have detected a large, extended group of comoving stars in the direction of the Galactic Centre, which we interpret as belonging to a dwarf galaxy that is closer to our own Galaxy than any other
Sagittarius: the nearest dwarf galaxy
We have discovered a new Galactic satellite galaxy in the constellation of Sagittarius. The Sagittarius dwarf galaxy is the nearest galaxy known, subtends an angle of $> 10$ degrees on the sky, lies
Galactic Halo Substructure in the Sloan Digital Sky Survey: The Ancient Tidal Stream from the Sagittarius Dwarf Galaxy
Two studies have recently reported the discovery of pronounced halo substructure in the Sloan Digital Sky Survey (SDSS) commissioning data. Here we show that this halo substructure is, almost in its
The Kinematics, Orbit, and Survival of the Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius galaxy (Sgr), the closest satellite galaxy of the Milky Way, has survived for many orbits about the Galaxy. Extant numerical calculations modeled this galaxy as a system with a
The QUEST RR Lyrae Survey: Confirmation of the Clump at 50 Kiloparsecs and Other Overdensities in the Outer Halo
We have measured the periods and light curves of 148 RR Lyrae variables from V = 13.5 to 19.7 from the first 100 deg2 of the Quasar Equatorial Survey Team RR Lyrae survey. Approximately 55% of these
Debris streams in the solar neighbourhood as relicts from the formation of the Milky Way
It is now generally believed that galaxies were built up through gravitational amplification of primordial fluctuations and the subsequent merging of smaller precursor structures. The stars of the
Identification of a-colored stars and structure in the halo of the Milky Way from Sloan digital sky survey commissioning data
A sample of 4208 objects with magnitude 15 < g* < 22 and colors of main-sequence A stars have been selected from 370 deg2 of Sloan Digital Sky Survey (SDSS) commissioning observations. The data is
Constraining the History of the Sagittarius Dwarf Galaxy Using Observations of Its Tidal Debris
We present a comparison of semianalytic models of the phase-space structure of tidal debris with measurements of average distances, velocities, and surface densities of stars associated with the
Great Circle Tidal Streams: Evidence for a Nearly Spherical Massive Dark Halo around the Milky Way
An all-high-latitude sky survey for cool carbon giant stars in the Galactic halo has revealed 75 such stars, of which the majority are new detections. Of these, more than half are clustered on a
...
1
2
3
4
5
...