The
Project
Mapping the Stellar Kinematics of Nearby Galaxies
J. Falc
ó
n
-
Barroso
Collaborators:
M. Balcells, A. Vazdekis, and the
SAURON
Team
PIs:
R. Bacon
(
Lyon
)
, R.L. Davies
(
Oxford
)
, P.T. de Zeeuw
(
Leiden
)
CoIs:
M
.
Bureau
,
M
.
Cappellari,
E
.
Emsellem,
J
.
Falc
ó
n
-
Barroso
,
D
.
Krajnovic,
H
.
Kuntschner,
R
.
McDermid,
R
.
F
.
Peletier
Associates:
R
.
van
den
Bosch,
Y
.
Copin,
K
.
Fathi,
K
.
Ganda,
B
.
Gerken,
J
.
de
Jong,
E
.
Jourdeuil,
B
.
Miller,
G
.
Monnet,
M
.
Sarzi,
T
.
Statler,
G
.
van
de
Ven,
A
.
Weijmans,
...
http://www.strw.leidenuniv.nl/sauron
The Team
Outline
Integral field kinematic features in early
-
type galaxies
Central disks, KDCs, Kin. Twists, CRCs
Pseudobulges
High spatial resolution stellar kinematics with
OASIS
A detailed study: NGC7332
A
SAURON
look at galaxy bulges
Projects on bulges
Minor
-
axis stellar kinematics (Flat velocity disp. Profiles)
The
SAURON
Bars Project
Conclusions
SAURON Stellar Velocity Fields
Emsellem et al. 2004, MNRAS, in press (astroph/0404034)
Stellar Kin: Central Stellar Disks
(Bureau et al. , Emsellem et al.)
Central Disks:
•
I: Disky isophotes
•
V:
Pinched isovelocities
Double
-
hump
•
:
Max along minor axis
Min along major
-
axis
•
h
3
:
A
nti
-
correlated with V
Kin. Twists:
(Triaxiality)
•
V: Kin. twist/misalignment
KDCs:
•
V: Abrupt kin. twist
Abrupt V change
Peculiarities
Strong/weak:
(NGC4526, 4459)
NGC4526
NGC4459
Stellar Kin.: Kin. Twists and KDCs
Kinematic Twist:
(NGC4477)
KDC:
(NGC4365)
Central Disks:
•
I: Disky isophotes
•
V: Pinched isovelocities
Double
-
hump
•
: Max along minor axis
Min along major
-
axis
•
h
3
: Anti
-
correlated with V
Kin. Twists:
(Triaxiality)
•
V
: Kin. twist/misalignment
KDCs:
•
V
: Abrupt kin. twist
Abrupt V change
Peculiarities
Davies et al. 2001
NGC4477
NGC4365
Stellar Kin.: CRs
Others:
(Crs; NGC3414, 3608)
NGC3414
NGC3608
Stellar Kin.: Others
Others:
(CR; NGC4473, 4550)
NGC4473
NGC4550
Pseudobulges
NGC3384
NGC7457
NGC7457
Flat velocity
dispersion field
NGC3384
Flat velocity
dispersion along the
major axis due to a
central disk
Best candidates for pseudobulges in Pinkney et al. 2003
SAURON and OASIS
SAURON: global kinematics and line
-
strengths
OASIS spatial resolution: zoom
-
in on nucleus
Allows study of orbital structure near central BH
McDermid et al. (2004)
NGC 4382
CD
Central Disks
KT
Kin. Twists
KDC
Kin. Decoupled
cores
CR
Counter
-
rotating
cores
Axi
Axisymmetric
galaxies
EC(/12)
Ellipticals Clusters
5
(9)
6
(9)
2
(3)
1
(1)
3
(6)
EF(/12)
Ellipticals Field
9
(11)
6
(9)
4
(6)
1
(1)
2
(4)
LC(/12)
Lenticulars Clusters
10
(10)
4
(5)
2
(2)
3
(3)
2
(5)
LF(/12)
Lenticulars Field
8
(9)
5
(7)
2
(4)
2
(4)
3
(6)
Total(/48)
32
(39)
21
(30)
10
(15)
7
(9)
10
(21)
Total(%)
67
(81)
44
(63)
21
(31)
15
(19)
21
(44)
Central stellar disks pervasive
(70
-
80%)
KDCs and counterrotation numerous
(>20
-
30%; >15
-
20%)
Non
-
axisymmetries very common
(45
-
60%)
Regular axisymmetric objects not as frequent
(20
-
40%)
Stellar Kin.: Comp. Incidence
Ordinary looking Boxy
-
S0 galaxy
Regular stellar kinematics
(Fisher et al. 1994)
Plateau in the light profile
(Lutticke et al. 2000)
Photometrically detected central disk
(Seifert & Scorza 1996)
Complex gas distribution, showing a
strong counter
-
rotating H
component
and a weak co
-
rotating one.
(Plana & Boulesteix 1996)
Flat H
line
-
strength along major axis
(Bender & Paquet 1999)
A
Case Study: NGC7332
(Falc
ó
n
-
Barroso et al. 2004)
NGC7332
NGC7339
A
Case Study: NGC7332
SAURON FoV
I
-
band major axis light profile
(Peletier & Balcells 1997)
Stellar Kinematics
A Kinematically Decoupled Core
Double
-
peak velocity dispersion
Kinematic Evidence of the Central Disk
Cylindrical Rotation
A
Case Study: NGC7332
Double
-
hump rotation curve
Major
-
Axis
Complex gas distribution in general with
some signs of ordered motion.
Off
-
plane gas clumps
Ionized
Gas Kinematics
A
Case Study: NGC7332
Absorption
Line Strength
Raw
Clean
A
Case Study: NGC7332
Age+Metallicity
Interpretation of the Results:
•
The presence of a bar
•
Boxy bulge
•
Plateau in the light profile
•
Cylindrical Rotation
•
Double
-
hump rotation curve
•
Velocity dispersion profile with a central minimum and a plateau at moderate radii
•
Strong h
3
–
V anti
-
correlation (revealing the central disk)
•
Homogeneous stellar populations (being 4
-
6 Gyr everywhere in the galaxy)
•
The origin of the gas
•
A tidal interaction with the neighbour galaxy NGC7339
•
Evolutionary Scenarios
•
The bar has certainly affected the evolution of NGC7332
•
It is also quite possible that interactions played a role in the shaping of NGC7332
A
Case Study: NGC7332
A look at galaxy bulges
Ongoing projects on bulges
24
Sa
bulges (as part of the main survey)
11
S0
-
Sbc
bulges from the Balcells & Peletier
sample
22
Sb
-
Sm
bulges (M. Carollo & R.F. Peletier)
The Balcells & Peletier Sample
•
A sample of highly inclined (i>50º) nearby
galaxies to look at pure bulges with no disk
contamination.
•
Photometry of 45 nearby bulges
(Balcells & Peletier 1994)
(Andredakis et al. 1995)
(Peletier & Balcells 1997)
(Balcells et al. 2003, 2004a, 2004b)
•
Stellar Populations of 19 bulges
(Peletier et al. 1999)
(Falcón
-
Barroso et al. 2002)
(Falcón
-
Barroso et al. 2003a)
•
Kinematics of 19 nearby bulges
(Falcón
-
Barroso et al. 2003b)
Long Slit spectroscopy (minor axis) of 19 bulges
from the Balcells & Peletier sample
ISIS at WHT (La Palma)
Ca II triplet region
SSP models from Vazdekis et al. 2003 used as
templates for kinematics
Minor
-
Axis Stellar Kinematics in bulges
(Falcón
-
Barroso et al 2003b)
Minor Axis Rotation
Minor
-
Axis Stellar Kinematics in bulges
Rotation in the inner parts
Velocity Dispersion Profiles
•
Centrally Peaked Profs.
Classical bulges
Large Vel. Disp. Gradient
(
<<0)
•
Flat Profiles
Bulges dominated by rotation
(Pseudobulges?, Kormendy 1993)
Small Vel. Disp. Gradient
(
~
0)
Minor
-
Axis Stellar Kinematics in bulges
Velocity dispersion gradients
No correlations were found
with bulge luminosity, central
velocity dispersion or S
é
rsic
index
n
Barred or box
-
peanut bulges
Non
-
Barred bulges
Minor
-
Axis Stellar Kinematics in bulges
2 strong barred galaxies observed (Aug 2003)
NGC936
NGC6951
The Bar Project
(
Jourdeuil
et al.)
Scientific Goals
2
D
application
of
the
Tremaine
-
Weinberg
method
to
measure
pattern
speeds
and
quantify
uncertainties
in
1
D
data
Detailed
study
of
the
orbital
structure
using
N
-
body
simulations
Link
between
the
orbital
structure
and
the
stellar
populations
Conclusions
Stellar kinematics exhibits rich variety:
(central disks pervasive; KDCs/CRs numerous; non
-
axisymmetry common)
Number of KDCs/CRs likely to increase with higher spatial resolution (i.e.
OASIS
)
NGC7332 shows evidence for hosting a bar + signatures for recent interactions
(with neighbour galaxy NGC7339?)
Big
SAURON
effort on spiral bulges (3 complementary samples are being studied)
Long slit minor axis stellar kinematics, on the Balcells & Peletier sample, show a wide
range of velocity dispersion profiles
Both, flattened bulges and galaxies with brighter face
-
on disk central surface brightness
showing shallower velocity dispersion profiles
A specific
SAURON
project on barred galaxies has started with the main goal of
studying in detail the orbital distribution its link with stellar populations
Enter the password to open this PDF file:
File name:
-
File size:
-
Title:
-
Author:
-
Subject:
-
Keywords:
-
Creation Date:
-
Modification Date:
-
Creator:
-
PDF Producer:
-
PDF Version:
-
Page Count:
-
Preparing document for printing…
0%
Comments 0
Log in to post a comment