scholarly journals Numerical Modelling of the Tidal Tails of NGC 5466

2007 ◽  
Vol 3 (S246) ◽  
pp. 189-190
Author(s):  
M. Fellhauer ◽  
N. W. Evans ◽  
V. Belokurov ◽  
M. I. Wilkinson ◽  
G. Gilmore
Keyword(s):  
Numerical Modelling ◽  
Numerical Simulations ◽  
Globular Cluster ◽  
Proper Motion ◽  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Stellar Halo ◽  
Dominant Process ◽  
Tidal Tails

AbstractThe study of sub-structures in the stellar halo of the Milky Way has made a lot of progress in recent years, especially since surveys like the Sloan Digital Sky Survey became available. In this paper we focus on the newly discovered tidal tails of the Galactic globular cluster NGC 5466. By means of numerical simulations we reproduce the tidal tails, which are the longest tails associated with a globular cluster known (>45°) and hereby finding a possible progenitor of NGC 5466 and analyse its stability. We show that perigalactic passages are the dominant process in the slow dissolution of NGC 5466. Furthermore we use the position of the tails to verify the accuracy of the observationally determined proper motion. The proper motion has to be refined only slightly (within their stated error-margin) to match the location of the tidal tails.

scholarly journals Detection of Massive Tidal Tails around the Globular Cluster Palomar 5 with Sloan Digital Sky Survey Commissioning Data

2001 ◽  
Vol 548 (2) ◽  
pp. L165-L169 ◽  
Author(s):  
Michael Odenkirchen ◽  
Eva K. Grebel ◽  
Constance M. Rockosi ◽  
Walter Dehnen ◽  
Rodrigo Ibata ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Tidal Tails

scholarly journals Gaia DR2 orbital properties for field stars with globular cluster-like CN band strengths

2019 ◽  
Vol 624 ◽  
pp. L9 ◽  
Author(s):  
A. Savino ◽  
L. Posti
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
Milky Way ◽  
Light Element ◽  
Small Population ◽  
Sloan Digital Sky Survey ◽  
Element Abundances ◽  
Halo Stars ◽  
Sky Survey ◽  
Gaia Dr2

Context. Large spectroscopic surveys of the Milky Way have revealed that a small population of stars in the halo have light element abundances comparable to those found in globular clusters. The favoured explanation for the peculiar abundances of these stars is that they originated inside a globular cluster and were subsequently lost. Aims. Using orbit calculations we assess the likelihood that an existing sample of 57 field stars with globular cluster-like CN band strength originated in any of the currently known Milky Way globular clusters. Methods. Using Sloan Digital Sky Survey and Gaia data, we determine orbits and integrals of motion of our sample of field stars, and use these values and metallicity to identify likely matches to globular clusters. The pivot hypothesis is that had these stars been stripped from such objects, they would have remained on very similar orbits. Results. We find that ∼70% of the sample of field stars have orbital properties consistent with the halo of the Milky Way; however, only 20 stars have likely orbital associations with an existing globular cluster. The remaining ∼30% of the sample have orbits that place them in the outer Galactic disc. No cluster of similar metallicity is known on analogous disc orbits. Conclusions. The orbital properties of the halo stars seem to be compatible with the globular cluster escapee scenario. The stars in the outer disc are particularly surprising and deserve further investigation to establish their nature.

scholarly journals CONSTRAINTS ON THE SHAPE OF THE MILKY WAY DARK MATTER HALO FROM JEANS EQUATIONS APPLIED TO SLOAN DIGITAL SKY SURVEY DATA

2012 ◽  
Vol 758 (1) ◽  
pp. L23 ◽  
Author(s):  
Sarah R. Loebman ◽  
Željko Ivezić ◽  
Thomas R. Quinn ◽  
Fabio Governato ◽  
Alyson M. Brooks ◽  
...  
Keyword(s):  
Dark Matter ◽  
Survey Data ◽  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Dark Matter Halo ◽  
Sky Survey

scholarly journals Using ground based data as a precursor for Gaia in getting proper motions of satellites

2017 ◽  
Vol 12 (S330) ◽  
pp. 210-213
Author(s):  
Tobias K. Fritz ◽  
Sean T. Linden ◽  
Paul Zivick ◽  
Nitya Kallivayalil ◽  
Jo Bovy
Keyword(s):  
Adaptive Optics ◽  
Globular Cluster ◽  
Proper Motion ◽  
Milky Way ◽  
Dwarf Galaxy ◽  
Optical Data ◽  
Line Of Sight ◽  
Wide Field ◽  
Proper Motions ◽  
Tidal Stream

AbstractWe present our effort to measure the proper motions of satellites in the halo of the Milky Way with mainly ground based telescopes as a precursor on what is possible with Gaia. For our first study, we used wide field optical data from the LBT combined with a first epoch of SDSS observations, on the globular cluster Palomar 5 (Pal 5). Since Pal 5 is associated with a tidal stream it is very useful to constrain the shape of the potential of the Milky Way. The motion and other properties of the Pal 5 system constrain the inner halo of the Milky Way to be rather spherical. Further, we combined adaptive optics and HST to get an absolute proper motion of the globular cluster Pyxis. Using the proper motion and the line-of-sight velocity we find that the orbit of Pyxis is rather eccentric with its apocenter at more than 100 kpc and its pericenter at about 30 kpc. The dynamics excludes an association with the ATLAS stream, the Magellanic clouds, and all satellites of the Milky Way at least down to the mass of Leo II. However, the properties of Pyxis, like metallicity and age, point to an origin from a dwarf of at least the mass of Leo II. We therefore propose that Pyxis originated from an unknown relatively massive dwarf galaxy, which is likely today fully disrupted. Assuming that Pyxis is bound to the Milky Way we derive a 68% lower limit on the mass of the Milky Way of 9.5 × 1011 M⊙.

scholarly journals THE MILKY WAY TOMOGRAPHY WITH SLOAN DIGITAL SKY SURVEY. IV. DISSECTING DUST

2012 ◽  
Vol 757 (2) ◽  
pp. 166 ◽  
Author(s):  
Michael Berry ◽  
Željko Ivezić ◽  
Branimir Sesar ◽  
Mario Jurić ◽  
Edward F. Schlafly ◽  
...  
Keyword(s):  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Sky Survey

scholarly journals Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe

2017 ◽  
Vol 154 (1) ◽  
pp. 28 ◽  
Author(s):  
Michael R. Blanton ◽  
Matthew A. Bershady ◽  
Bela Abolfathi ◽  
Franco D. Albareti ◽  
Carlos Allende Prieto ◽  
...  
Keyword(s):  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Nearby Galaxies

scholarly journals NUMERICAL COLOR-MAGNITUDE DIAGRAM ANALYSIS OF SLOAN DIGITAL SKY SURVEY DATA AND APPLICATION TO THE NEW MILKY WAY SATELLITES

2008 ◽  
Vol 135 (4) ◽  
pp. 1361-1383 ◽  
Author(s):  
J. T. A. de Jong ◽  
H.-W. Rix ◽  
N. F. Martin ◽  
D. B. Zucker ◽  
A. E. Dolphin ◽  
...  
Keyword(s):  
Survey Data ◽  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Magnitude Diagram ◽  
Diagram Analysis

scholarly journals The Apache Point Observatory Galactic Evolution Experiment (APOGEE)

2009 ◽  
Vol 5 (S262) ◽  
pp. 428-429
Author(s):  
Ricardo P. Schiavon ◽  
Steven R. Majewski
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Milky Way ◽  
Galactic Evolution ◽  
Sloan Digital Sky Survey ◽  
Elemental Abundances ◽  
Sky Survey ◽  
The Galaxy ◽  
Evolution Experiment ◽  
Under Construction

AbstractThe Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a large scale, high-resolution, near-infrared spectroscopic survey of Milky Way stellar populations and one of the four experiments in the Sloan Digital Sky Survey III (SDSS-III). APOGEE will be based on a new multi-fiber cryogenic spectrograph, currently under construction, expected to begin survey observations on the 2.5 m Sloan telescope in the Spring of 2011. APOGEE will measure high-precision radial velocities and elemental abundances for ~15 elements for ~ 105 stars, and is expected to shed new light on the processes that led to the formation of the Galaxy.

scholarly journals On the stark difference in satellite distributions around the Milky Way and Andromeda

2014 ◽  
Vol 439 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Basilio Yniguez ◽  
Shea Garrison-Kimmel ◽  
Michael Boylan-Kolchin ◽  
James S. Bullock
Keyword(s):  
Radial Distribution ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Dwarf Galaxies ◽  
Sloan Digital Sky Survey ◽  
The Sun ◽  
Angular Anisotropy ◽  
Satellite Systems ◽  
Sky Survey ◽  
Number Counts

Abstract We compare spherically averaged radial number counts of bright (≳105 L⊙) dwarf satellite galaxies within 400 kpc of the Milky Way (MW) and M31 and find that the MW satellites are much more centrally concentrated. Remarkably, the two satellite systems are almost identical within the central 100 kpc, while M31 satellites outnumber MW satellites by about a factor of 4 at deprojected distances spanning 100–400 kpc. We compare the observed distributions to those predicted for Λ cold dark matter (ΛCDM) subhaloes using a suite of 44 high-resolution ∼1012 M⊙ halo zoom simulations, 22 of which are in pairs like the MW and M31. We find that the radial distribution of satellites around M31 is fairly typical of those predicted for subhaloes, while the MW's distribution is more centrally concentrated than any of our simulated ΛCDM haloes. One possible explanation is that our census of bright (≳105 L⊙) MW dwarf galaxies is significantly incomplete beyond ∼100 kpc of the Sun. If there were ∼8–20 more bright dwarfs orbiting undetected at 100–400 kpc distance, then the MW's radial distribution would fall within the range expected from subhalo distributions and also look very much like the known M31 system. We use our simulations to demonstrate that there is enough area left unexplored by the Sloan Digital Sky Survey and its extensions that the discovery of ∼10 new bright dwarfs is not implausible given the expected range of angular anisotropy of subhaloes in the sky.

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