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/0210381 Contents OGLE intro Data Analysis & Results Summary & Future Takahiro Sumi

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

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

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

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)

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/0210381

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

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

Microlensing Optical Depth Axisymmetric Galactic bulge model Kiraga & Paczynski 1994, Evans 1994 etc. DoPHOT 9 events. Udalski et al. 1994 DoPHOT 13 events Alcock et al. 1998 DIA 99 events Alcock et al. 2000 DIA 28 events Sumi et al. 2002 Bar model with Small inclination angle. Paczynski et al.1994, Zhao et al. 1995 etc.

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)

Idea Mao&Paczynski, 2002 Sun faint bright

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

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

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

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

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

Uncertainty in HST: 3mas, 0.7mas/yr with 7yr, 3epoch 10 11 12 13 14 15 16 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

Differential refraction as a function of V-I

Compare with Eyer & Wozniak, 2001

Proper motion distribution all

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)

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

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

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

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

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

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

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.

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

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

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

Results