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 - 2023
#notes
1 BPS CS 22876-0040 Pe* 00 04 52.4533662120 -34 13 37.340811552   15.49 15.09     ~ 16 0
2 2MASS J00202896-3612006 Pe* 00 20 28.9585324632 -36 12 00.739836144   14.05 13.6     ~ 6 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12247 1
4 2MASS J01464783-3417437 Pe* 01 46 47.8331136696 -34 17 43.733605164   14.07 13.6     ~ 7 0
5 2MASS J02373410-1256217 Pe* 02 37 34.0999825800 -12 56 21.816403296   13.79 13.2     ~ 8 0
6 CD-36 1052 HB* 02 47 37.4429774568 -36 06 27.032483376   10.426 9.982 9.818 9.37 Fwl 72 1
7 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 198 1
8 V* TT Cnc RR* 08 32 55.1813237448 +13 11 28.444029000   11.62 11.10     kA8.5hF7 132 0
9 V* TT Lyn RR* 09 03 07.7864688408 +44 35 08.119623336 9.87 9.75 9.51     kA3.5hF3.5 153 0
10 CD-80 328 PM* 09 24 20.9742522694 -80 31 21.299040537   10.63 10.00     sdG 78 0
11 HD 237846 Pe* 09 52 38.6827483320 +57 54 58.614479532   10.60 9.95     CEMP-no 97 0
12 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1144 0
13 BD+10 2495 SB* 12 59 19.9306410576 +09 14 35.634594444   10.44 9.73     G0 76 0
14 HD 119516 HB* 13 43 26.7251638944 +15 34 31.069770096   9.59 9.12     G5 76 0
15 HD 128279 Pe* 14 36 48.5108525999 -29 06 46.612858494 8.64 8.63 8.00     Gw 192 0
16 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 742 1
17 V* AR Ser RR* 15 33 30.8124184584 +02 46 37.888313880   11.92 11.85     kA6.5hF7.5 70 0
18 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13679 0
19 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2079 2
20 BPS CS 22948-0093 Pe* 21 50 31.5180047928 -41 07 49.355148468   15.54 15.18     ~ 36 0
21 HD 214161 Pe* 22 37 08.0751067608 -40 30 38.630349000   9.83 9.1     G5/8wF(0) 33 0
22 V* RZ Cep RR* 22 39 13.1768504856 +64 51 30.611384316   9.48 9.49 9.3   kA0.5hF0.5 158 0
23 BPS CS 29513-0031 Pe* 23 25 11.3549358336 -39 59 28.350305952   15.44 15.09     ~ 15 0
24 NAME Helmi Stream St* ~ ~           ~ 54 0
25 NAME RHLS Stream St* ~ ~           ~ 2 0

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2023.06.04-19:27:02

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