2018MNRAS.478..228Q

Query : 2018MNRAS.478..228Q

2018MNRAS.478..228Q - Mon. Not. R. Astron. Soc., 478, 228-254 (2018/July-3)

The GALAH survey: stellar streams and how stellar velocity distributions vary with Galactic longitude, hemisphere, and metallicity.

QUILLEN A.C., DE SILVA G., SHARMA S., HAYDEN M., FREEMAN K., BLAND-HAWTHORN J., ZERJAL M., ASPLUND M., BUDER S., D'ORAZI V., DUONG L., KOS J., LIN J., LIND K., MARTELL S., SCHLESINGER K., SIMPSON J.D., ZUCKER D.B., ZWITTER T., ANGUIANO B., CAROLLO D., CASAGRANDE L., COTAR K., COTTRELL P.L., IRELAND M., KAFLE P.R., HORNER J., LEWIS G.F., NATAF D.M., TING Y.-S., WATSON F., WITTENMYER R. and WYSE R.

Abstract (from CDS):

Using GALAH (GALactic Archaeology with HERMES) survey data of nearby stars, we look at how structure in the planar (u, v) velocity distribution depends on metallicity and on viewing direction within the Galaxy. In nearby stars with distance d ≲1 kpc, the Hercules stream is most strongly seen in higher metallicity stars [Fe/H] > 0.2. The Hercules stream peak v value depends on viewed galactic longitude, which we interpret as due to the gap between the stellar stream and more circular orbits being associated with a specific angular momentum value of about 1640 km s–1 kpc. The association of the gap with a particular angular momentum value supports a bar resonant model for the Hercules stream. Moving groups previously identified in Hipparcos(HIgh Precision Parallax COllecting Satellite) observations are easiest to see in stars nearer than 250 pc, and their visibility and peak velocities in the velocity distributions depends on both viewing direction (galactic longitude and hemisphere) and metallicity. We infer that there is fine structure in local velocity distributions that varies over distances of a few hundred pc in the Galaxy.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Galaxy: disc - Galaxy: evolution - Galaxy: kinematics and dynamics

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

CDS comments: Hercules I = [D98b] 8 = group He and Hercules II = [D98b] 9 = group HV are not in Simbad.

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3432 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
4 NAME Gal Anticenter reg 05 46 +28.9           ~ 910 0
5 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2342 0
6 NAME Car Arm PoG 10 00 -60.0           ~ 439 1
7 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 439 2
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14400 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4385 3
10 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1
11 NAME Pleiades Moving Group MGr ~ ~           ~ 277 1
12 NAME Sirius Moving Group MGr ~ ~           ~ 106 0
13 NAME Wolf 630 Moving Group MGr ~ ~           ~ 38 0
14 NAME Galactic Bar reg ~ ~           ~ 1217 0
15 NAME HR 1614 Moving Group As* ~ ~           ~ 49 0
16 NAME Local Arm reg ~ ~           ~ 537 0
17 NAME Coma Berenices Moving Group MGr ~ ~           ~ 84 0
18 NAME Hercules Stream MGr ~ ~           ~ 237 0
19 NAME Hyades Moving Group MGr ~ ~           ~ 281 0

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