2005A&A...439..551R


Query : 2005A&A...439..551R

2005A&A...439..551R - Astronomy and Astrophysics, volume 439, 551-558 (2005/8-4)

Structure in the motions of the fastest halo stars.

RE FIORENTIN P., HELMI A., LATTANZI M.G. and SPAGNA A.

Abstract (from CDS):

We analyzed the catalog published by Beers et al. (2000AJ....119.2866B) of 2106 non-kinematically selected metal poor stars in the solar neighborhood, with the goal of quantifying the amount of substructure in the motions of the fastest halo stars. We computed the two-point velocity correlation function for a subsample of halo stars within 1-2 kpc of the Sun, and found statistical evidence of substructure with a similar amplitude to that predicted by high resolution CDM simulations. The signal is due to a small kinematic group whose dynamical properties are compared to the stellar ``stream'' previously discovered by Helmi et al. (1999Natur.402...53H). If real, this high velocity moving group would provide further support for the idea that substructures remain as fossils from the formation of the Galaxy as expected in the CDM scenario.

Abstract Copyright:

Journal keyword(s): Galaxy: formation - Galaxy: halo - Galaxy: kinematics and dynamics

Nomenclature: NAME RHLS Stream N=1.

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BPS CS 22876-0040 Pe* 00 04 52.4533761566 -34 13 37.342795311   15.49 15.09     ~ 14 0
2 2MASS J00202896-3612006 PM* 00 20 28.9584272785 -36 12 00.739770977   14.05 13.61     ~ 5 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11481 1
4 2MASS J01464783-3417437 * 01 46 47.8331404520 -34 17 43.734345236   14.07 13.57     ~ 6 0
5 2MASS J02373410-1256217 * 02 37 34.0998908230 -12 56 21.817453345   13.79 13.21     ~ 7 0
6 CD-36 1052 HB* 02 47 37.4431031917 -36 06 27.032237736   10.426 9.982 9.818 9.37 Fwl 66 1
7 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 194 1
8 V* TT Cnc RR* 08 32 55.1814752895 +13 11 28.445049233   11.62 11.10     F0 124 0
9 V* TT Lyn RR* 09 03 07.7866525912 +44 35 08.122607393 9.87 9.75 9.51     A9.2 143 0
10 CD-80 328 PM* 09 24 20.9723082165 -80 31 21.303920418   10.63 10.00     sdG 74 0
11 HD 237846 Pe* 09 52 38.6831536740 +57 54 58.617728496   10.60 9.95     CEMP-no 89 0
12 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1074 0
13 BD+10 2495 Pe* 12 59 19.9306193436 +09 14 35.638418393   10.44 9.73     G0 71 0
14 HD 119516 HB* 13 43 26.7252675198 +15 34 31.070293046   9.59 9.12     G5 69 0
15 HD 128279 Pe* 14 36 48.5106582134 -29 06 46.610625293 8.64 8.63 8.00     Gw 181 0
16 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 707 1
17 V* AR Ser RR* 15 33 30.8124272096 +02 46 37.887440390   11.92 11.85     F3 66 0
18 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12447 0
19 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1873 2
20 BPS CS 22948-0093 Pe* 21 50 31.5179802313 -41 07 49.353957554   15.54 15.18     ~ 34 0
21 HD 214161 PM* 22 37 08.0752432901 -40 30 38.632052127   9.83 9.13     G5/8wF(0) 29 0
22 V* RZ Cep RR* 22 39 13.1765877051 +64 51 30.609250748   9.48 9.49 9.3   A0-F2 151 0
23 BPS CS 29513-0031 Pe* 23 25 11.3548969440 -39 59 28.346901856   15.44 15.09     ~ 12 0
24 NAME H99 Stream St* ~ ~           ~ 19 0
25 NAME RHLS Stream St* ~ ~           ~ 2 0

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2021.10.19-18:12:41

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