Extinction shot

Information about Extinction shot

Published on November 15, 2007

Author: Olivier

Source: authorstream.com

Content

Extinction Map of the Galactic center: OGLE-II Galactic bulge fields:  Extinction Map of the Galactic center: OGLE-II Galactic bulge fields Takahiro Sumi (Princeton) Contents introduction ratio of total to selective extinction RI Extinction map Summary astro-ph/0309206 Motivations for Extinction map:  Motivations for Extinction map The Galactic Bulge is the only bulge in which Individual stars can be resolved. the Galactic bar and disk model Microlensing Optical depth Stellar population Stellar kinematics Variable stars Source of Microlensing Dust property in this field Color Magnitude Diagram (CMD):  Color Magnitude Diagram (CMD) BUL_SC1 BUL_SC22 Extinction maps :  Extinction maps resolution Stanek, 1996; OGLE-I, RCG, V, I Schlegel, Finkbeiner & Davis, 1998 (SFD); COBE+IRAS, Schultheis et al. 1999; DENIS+2MASS, RGB,AGB, J,K -> AV Dutra et al. 2003 2MASS, RGB, J.K -> AK Sumi et al. 2003 MOA, RCG, V,I Popowski et al. 2003; MACHO, V,R RI =1.5 RVI=2.5 RV =3.1 14.2arcmin Stanek’s Extinction map of Baade’s Window Red Clump Giants:  Globular cluster 47 Tuc Red Clump Giants Metal-rich horizontal branch stars Small intrinsic width in luminosity function (~0.2mag) (Stanek et al.,1997) Microlensing Optical Depth:  Microlensing Optical Depth Subtract image Art image X = Efficiency HST Luminosity Function Event rate (Sumi et al. 2003) Measurements of streaming motions of the Galactic bar with Red Clump Giants:  Measurements of streaming motions of the Galactic bar with Red Clump Giants Sumi, Eyer & Wozniak MNRAS, 340, 1346, 2003 Anomalous color (V-I)0 of RCG & RR Lyrae:  Anomalous color (V-I)0 of RCG & RR Lyrae <V-I>0,RC=1.11 mag, (Paczynski et al. 1999) < V -I>0,RR,BW - <V-I>0,RR,local =0.17 mag (Paczynski & Stanek 1998) 1.22 1.01 (Stutz, Popowski & Gould 1999) If RVI~2 instead of 2.5 then this discrepancy vanish (Popowski 2000) Udalski (2003) found RVI~2.0 Measure the Extinction :  Measure the Extinction Trace RCGs (standard candle) centroid In the CMD 1. Ratio of the total to selective extinction 2. Measure the color of RCG in each bin with high spatial resolution. Then transform to Reddening & Extinction. Assume <V-I>0,RC=1 Data:  Data 1.3-m Warsaw telescope 2048x2048 pixels CCD Seeing ~ 1.3” Drift scan mode (2048x8192 pixels) FOV: 14’x55’ OGLE-II VI catalog of the Galactic Bulge, Udalski et al. 2002, 30Millions stars OGLE I v.s. Landolt I:  l [deg] FOV:14’x55’ OGLE I v.s. Landolt I Udalski et al. (1992)) A model atomsphere of a giant by Kurucz (1993) With [Fe/H]=-0.2, logg-2.0, Teff=4500K typical RCG value Standard ExtinctionRV=3.1 (Caldelli, Clayton & Mathis 1989) model OGLE-II I filter give brighter I-band (redder V-I color)   BUL_SC1 image:  128 pix = 54” FOV:14’x55’   BUL_SC1 image 128 pix Combine bins into groups by using RCG (V-I) color :  128 pix=54” Combine bins into groups by using RCG (V-I) color Gauss+Power:  Gauss+Power Gauss:  Gauss region:  region H G F D K C B I J E A OGLE-II 49 GB fields & SDF Schlegel, Finkbeiner & Davis (1998) I-(V-I):  I-(V-I) Udalski, 2003 LMC:  LMC Caldelli, Clayton & Mathis (1989) Fitzpatrick (1999) observed LMC RV=AV/E(B-V) &:  RV=AV/E(B-V) & Udalski, 2003 RVI=AV/E(V-I) MACHO photometry give similar results (Popowski private comunication ) RI:  RI I0,RC:  I0,RC Make Extinction Map :  Make Extinction Map Fix measured value of RI=0.96 & I0,RC. 1. Dived each field into smaller bins with the size of 64~157 pixels, chosen so that each bin has ~200 stars. Then measure the average clolor <V-I>all in each bin. 2. Arrange bins in order of extinction by using <V-I>all, and combine them into groups from low to high extinction untill each group is filled by ~100 RCGs. CMD of groups:  CMD of groups Zero point of AV using 20 RRLyrae from Alcock et al. 1998:  Zero point of AV using 20 RRLyrae from Alcock et al. 1998 log Avmap:  Avmap +l Stanek’s Extinction map of Baade’s Window :  Stanek’s Extinction map of Baade’s Window resolution 14.2arcmin Compare with SFD extinction map:  Compare with SFD extinction map (made by Coline) Compare with SDF extinction map:  Compare with SDF extinction map resolution crossref:  crossref RR Lyrae type ab:  RR Lyrae type ab RR Lyrae type ab:  RR Lyrae type ab RI=1 RR Lyrae type ab:  RR Lyrae type ab VIRR & VIRC:  VIRR & VIRC (V-I)RC=1.028 (V-I)RR~0.45 local RR Lyrae Brightness:  RR Lyrae Brightness I =14.98 mag V=15.43 mag DMGC=14.52 (8kpc) Mv=1.17+0.26[Fe/H], (Dambis&Rastorguev, 2001) [Fe/H]~-1, (Lee, 2001) Extinction corrected Summary:  Summary Confirmed anomalus value of RVI=1.9~2.1 We constructed the extinction maps of OGLE-II GB fields based on two band photometry of RCGs This map must be very useful in various purpose in these fields Future Expand to OGLE-III OGLE (Optical Gravitational Lensing Experiment) :  OGLE (Optical Gravitational Lensing Experiment) 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’ Las Campanas Observatory Altitude: 2300m Bar:  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 Schultheis & Dutra map:  Schultheis & Dutra map Schultheis et al. 1999; DENIS+2MASS, RGB,AGB, J,K -> AV Dutra et al. 2003 2MASS, RGB, J.K -> AK Dutra et al. 2003 Period Color relation in small amplitude variables:  Period Color relation in small amplitude variables Wray, Eyer & Paczynski, 2003 Extinction map of MOA:  Extinction map of MOA (Sumi et al. 2003) resolution Stanek’s Extinction map of Baade’s Window :  Stanek’s Extinction map of Baade’s Window resolution 14.2arcmin Stanek 1996 RVI=2.5 RV =3.1 Proper motion fit:  Proper motion fit 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 populations:  populations 13.5<I0<14.23 (bright) 14.39<I0<14.76 (faint) 0.84<(V-I)0<1.38 (both) 13.0<I0<15.0 (bright) 15.0<I0<16.0 (faint) 0.2<(V-I)0<0.8 (both) 15.4<I0<15.9 (bright) 16.0<I0<16.5 (faint) 0.9<(V-I)0<1.5 (both) RG: DS: RCG: Extinction-corrected magnitude I0 and color (V-I)0 by extinction map(Stanek,1996) Distribution of m:  Distribution of m bright faint is consistent with vb~100 km/s RCG Red Giant l relative to G.C. which is consistent with flat rotation curve of Vr~220km/s. RGs are on average at the G.C. Disk MS OGLE-II 49 GB fields:  l [deg] FOV:14’x55’ OGLE-II 49 GB fields Comparison with other photometry:  Comparison with other photometry Luminosity Function in  BUL_SC5:  128 pix=54” FOV:14’x55’ Luminosity Function in  BUL_SC5 OGLE-II 49 GB fields & SDF:  OGLE-II 49 GB fields & SDF Schlegel, Finkbeiner & Davis (1998) made by Collinge RCG (V-I) color :  128 pix=54” RCG (V-I) color VIRC-Viall:  VIRC-Viall BUL_SC22 RV v.s. AV:  RV v.s. AV Histgam:  Histgam VIRR significance:  VIRR significance CMD:  CMD MI0,RC=-0.26 mag, (Alves et al. 2002) DMGC=14.52 (D0=8kpc), (Eisenhauer et al. 2003) QSO search behind stellar dense fields:  QSO search behind stellar dense fields Eyer, 2002; Dobrzycki et al, 2002 Geha et al. 2002 (MACHO) LMC: 38 SMC: 9 Slow, irregular, blue variables: Color cut LMC SMC Extra-solar planet:  Extra-solar planet 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)

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