SIMBAD references

2016ApJ...823..157I - Astrophys. J., 823, 157 (2016/June-1)

Line-of-sight velocity and metallicity measurements of the Palomar 5 tidal stream.

ISHIGAKI M.N., HWANG N., CHIBA M. and AOKI W.

Abstract (from CDS):

We present Subaru/Faint Object Camera and Spectrograph and Keck/Deep Imaging Multi-Object Spectrometer medium-resolution spectroscopy of a tidally disrupting Milky Way (MW) globular cluster Palomar 5 (Pal 5) and its tidal stream. The observed fields are located to cover an angular extent of ∼17° along the stream, providing an opportunity to investigate a trend in line-of-sight velocities (Vlos) along the stream, which is essential to constrain its orbit and underlying gravitational potential of the MW's dark matter halo. A spectral fitting technique is applied to the observed spectra to obtain stellar parameters and metallicities ([Fe/H]) of the target stars. The 19 stars most likely belonging to the central Pal 5 cluster have a mean Vlos of -58.1±0.7 km/s and metallicity [Fe/H]=-1.35±0.06 dex, both of which are in good agreement with those derived in previous high-resolution spectroscopic studies. Assuming that the stream stars have the same [Fe/H] as the progenitor cluster, the derived [Fe/H] and {V}_{los} values are used to estimate the possible Vlos range of the member stars at each location along the stream. Because of the heavy contamination of the field MW stars, the estimated Vlos range depends on prior assumptions about the stream's {V}_{los} , which highlights the importance of more definitely identifying the member stars using proper motion and chemical abundances to obtain unbiased information of Vlos in the outer part of the Pal 5 stream. The models for the gravitational potential of the MW's dark matter halo that are compatible with the estimated Vlos range are discussed.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: individual: Palomar 5 - stars: abundances - stars: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/ApJ/823/157): table4.dat table5.dat>

Nomenclature: Table 4: [IHC2016] CE1 sNN N=9 among (Nos s1-s21), [IHC2016] CE2 sNN N=10 among (Nos s8-s24). Table 5: [IHC2016] FDNN NN N=130 among (Nos FD1-2 to FD10 80).

Simbad objects: 160

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2020.02.17-02:23:03

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