1. Measurements of streaming motions of the Galactic bar with Red Clump Giants
Takahiro Sumi (Princeton)
Laurent Eyer (Geneva Obs.)
Prezmek Wozniak (Los Alamos)
MNRAS in press, astro-ph/
Contents
OGLE
intro
Data Analysis & Results
Summary & Future
Takahiro Sumi

2. OGLE (Optical Gravitational Lensing Experiment)
Las Campanas Observatory
Altitude: 2300m
OGLE-I : 1991~1996
: 1m, 2kx2k CCD
OGLE-II : 1997~2000
: 1.3m, 2kx2k CCD, 14’x14’
OGLE-III: 2001~
: 1.3m, 8kx8k mosaic CCD
: 35’x35’
Takahiro Sumi

3. microlensing Galactic Center: OGLE-I : 1991~1996, 19 events
Takahiro Sumi
OGLE-I : 1991~1996, events
OGLE-II : 1997~2000, 170 events
OGLE-III: 2001~ , 389 events
Galactic Center:

4. microlensing in QSO 2237+0305 (Einstein Cross)
Wozniak et al.2000,
Yonehara 2001
Takahiro Sumi
RA (J2000.0)
22:40:30.27
Dec (J2000.0)
03:21:31.0

5. Extra-solar planet
Takahiro Sumi
OGLE-III:2001, 59 candidates, G.C. (Udalski et al, 2002)
2002, 62 candidates, Carina arm (Udalski et al.2003)
1 (OGLE-TR-56) was confirmed by radial velocity
(Konacki et al. 2003)

6. Measurements of streaming motions of the Galactic bar with Red Clump Giants
Takahiro Sumi (Princeton)
Laurent Eyer (Geneva Obs.)
Prezmek Wozniak (Los Alamos)
Takahiro Sumi
MNRAS in press, astro-ph/

7. Bar Vaucouleur,1964, gas kinematics Blitz&Spergel,1991, 2.4
asymmetry in longitude．
Weiland et al.,1994,
COBE-DIRBE,confirmed
the asymmetry.
Nakada et al.,1991,　
distribution of IRAS
bulge stars
Whitelock&Catchpole,
1992, distribution of Mira
Kiraga &Paczynski,1994
Microlening Optical depth

8. COBE-DIRBE all extinction correct disk subtracted Weiland et al.,1994,
confirmed the asymmetry.
all extinction correct disk subtracted

9. Microlensing Optical Depth
Axisymmetric Galactic bulge model
Kiraga & Paczynski 1994, Evans etc.
DoPHOT 9 events. Udalski et al. 1994
DoPHOT 13 events Alcock et al. 1998
DIA events Alcock et al. 2000
DIA events Sumi et al. 2002
Bar model with Small inclination angle. Paczynski et al.1994, Zhao et al etc.

10. Red Clump Giants (Stanek et al.,1997)
Metal-rich horizontal branch stars
Small intrinsic width in luminosity function (~0.2mag)
Globular cluster 47 Tuc
(Stanek et al.,1997)

11. Idea
Mao&Paczynski, 2002
Sun
faint bright

12. Data 1.3-m Warsaw telescope 2048x2048 pixels CCD Seeing ~ 1.3”
OGLE-II BUL_SC1 (Baade’s Window)
Drift scan mode (2048x8192 pixels)
FOV: 14’x55’
266 I-band frames during 1997~2000
Divid image into 512x128 pixel subframes

13. l [deg]
OGLE BUL_SC1 field
FOV:14’x55’

14. 　　BUL_SC1 image
128 pix
512 pix
FOV:14’x55’

15. Analysis Measure the position of stars by DoPhot
Align to OGLE catalog with
400 brightest stars
Get positional shift from catalog
Proper motion fitting
Measure the mean value of proper motion of each sample

16. Proper motion fit 46,961 stars
a:differential refraction coefficient
z:zenith angle
C:angle by zenith, star and South pole
46,961 stars
ftp: astro.princeton.edu:/sumi/propermotion/bul_sc1.fit.gz

17. Uncertainty in HST: 3mas, 0.7mas/yr with 7yr, 3epoch 10 11 12 13 14 1516
4.84
1.40
0.83
0.88
1.18
1.80
3.44
(mag)
(mas/yr)
HST: 3mas, 0.7mas/yr with 7yr, 3epoch

18. Differential refraction as a function of V-I

19. Compare with
Eyer & Wozniak, 2001

20. Proper motion distribution
all

21. RCG: DS: RG: populations 13.5<I0<14.23 (bright)
14.39<I0<14.76 (faint)
0.84<(V-I)0<1.38 (both)
DS:
13.0<I0<15.0 (bright)
15.0<I0<16.0 (faint)
0.2<(V-I)0<0.8 (both)
RG:
15.4<I0<15.9 (bright)
16.0<I0<16.5 (faint)
0.9<(V-I)0<1.5 (both)
Extinction-corrected magnitude I0 and color (V-I)0 by extinction map(Stanek,1996)

22. Results of DS Mean position shift: Filled circle :bright
Solid :bright
Dashed :faint
Mean position shift:
Filled circle :bright
Dot :all sample
Open circle: faint

23. Results of DS N bright Solid :bright faint Dashed :faint group rms
bright DS
faint DS

24. Results of DS
relative to G.C. which is consistent with flat rotation curve of Vr~220km/s, assuming solar motion of

25. Results of RCG Mean position shift: Filled circle :bright
Dot :all sample
Open circle : faint

26. Results of RCG is consistent with vb~100 km/s N bright Solid :bright
faint
Solid :bright
Dashed :faint
group N
rms
bright RCG
faint RCG
is consistent with vb~100 km/s

27. Results of RG Mean position shift: Filled circle :bright
Thick:bright
Thin :faint
Solid :bright
Dashed :faint
Mean position shift:
Filled circle :bright
Dot :all sample
Open circle: faint

28. RGs are on average at the G.C.
Results of RG
Thick:bright
Thin :faint
Solid :bright
Dashed :faint
group N
rms
bright RCG
faint RCG
RGs are on average at the G.C.

29. Can’t distinguish Disk stars
HST observation
(Kuijken,2002)
Can’t distinguish Disk
stars

30. Future Expand to OGLE 49 fields Summary
DS: relative to G.C. is consistent with flat rotation curve of Vr~220km/s
is consistent with vb~100 km/s
Future
Expand to OGLE 49 fields

31. QSO search behind stellar dense fields
Slow, irregular, blue variables:
Eyer, 2002
Dobrzycki et al, 2002
(OGLE)
SMC:5
Geha et al. 2002
(MACHO)
LMC: 38
SMC: 9

32. Results