11

VERAVERA によるによる近傍星形成領域の位置天文観測近傍星形成領域の位置天文観測

Tomoya Hirota (VERA, NAOJ)Tomoya Hirota (VERA, NAOJ)

22

H2O masers in SFRs within 1 kpc from the SunH2O masers in SFRs within 1 kpc from the Sun OrionOrion-Monoceros Molecular Cloud complex-Monoceros Molecular Cloud complex TaurusTaurus PerseusPerseus OphiuchusOphiuchus SerpensSerpens Cepheus-CassiopeiaCepheus-Cassiopeia

Nearby SFRs projectNearby SFRs project

Distribution of molecular Distribution of molecular clouds (Dame et al. 1987)clouds (Dame et al. 1987)

33

Goal of our projectGoal of our project To measure distances to To measure distances to

nearby molecular cloudsnearby molecular clouds To reveal structure and To reveal structure and

dynamics of molecular dynamics of molecular

cloudsclouds To reveal structure and To reveal structure and

dynamics of Local armdynamics of Local arm

Nearby SFRs projectNearby SFRs project

Distribution of molecular clouds Distribution of molecular clouds (Grabelsky et al. 1988)(Grabelsky et al. 1988)

44

Nearest GMCs/High-mass SFRsNearest GMCs/High-mass SFRs Numbers of H2O masersNumbers of H2O masers Distance estimatedDistance estimated with various with various methodsmethods 3D-structure of 3D-structure of molecular cloudsmolecular clouds

Distribution of molecular Distribution of molecular clouds (Wilson et al. 2005)clouds (Wilson et al. 2005) and H2O masers and H2O masers (Valdettaro et al. 2001)(Valdettaro et al. 2001)

South Filament (457pc)

Crossbones (465pc)

Mon R2(800pc)

NGC2149 (425pc)

Orion B (387-514pc)

Orion A (412-521pc)

Northern Filament (393pc)

Scissors (~150pc)

Orion East (120pc)

Orion-Monoceros complexOrion-Monoceros complex

55

Orion KL region in Orion A molecular cloudsOrion KL region in Orion A molecular clouds

Optical image CO(J=1-0) NIR(Subaru)Optical image CO(J=1-0) NIR(Subaru)

Orion-Monoceros complexOrion-Monoceros complex

66

Orion KL regionOrion KL region NIR image (Subaru) H2O masers (VERA) NIR image (Subaru) H2O masers (VERA)

77

Masers in Orion KL regionMasers in Orion KL region H2O masers (VERA) SiO masers (VERA; Kim et al.) H2O masers (VERA) SiO masers (VERA; Kim et al.)

Disk? Jet?

88

Kinematics not fully understoodKinematics not fully understood

NW-SE outflow(SiO)+ torus(H2O) Disk + NE-SW outflow (SiO)NW-SE outflow(SiO)+ torus(H2O) Disk + NE-SW outflow (SiO)

(Greenhill et al. 1998) (Greenhill et al. 2003)(Greenhill et al. 1998) (Greenhill et al. 2003)

Masers in Orion KL regionMasers in Orion KL region

SiO(VLBA) H2O(VLA) SiO(VLBA)

99

H2O masers in Orion KLH2O masers in Orion KL NIR image (Subaru) H2O masers (VERA) NIR image (Subaru) H2O masers (VERA)

1010

Hirota et al. 2007, PASJ, in pressHirota et al. 2007, PASJ, in press 2.29+/-0.10 mas2.29+/-0.10 mas

　 　 = 437+/-19 pc= 437+/-19 pc

Error sourcesError sources Structure?Structure? Zenith delay?Zenith delay?

H2O masers in Orion KLH2O masers in Orion KL

1111

Kim et al. in prep. Kim et al. in prep. D=401+/-10 pcD=401+/-10 pc Higher precision even with 6-month observations!Higher precision even with 6-month observations!

SiO masers in Orion KLSiO masers in Orion KL

1212

Proper motion of source I Proper motion of source I (3.5 mas, -4.4 mas; (3.5 mas, -4.4 mas;

Rodriguez et al. 2005)Rodriguez et al. 2005) Absolute proper motion of Absolute proper motion of

the maser feature the maser feature (2.77 mas, -8.97 mas): 19.7 kms(2.77 mas, -8.97 mas): 19.7 kms-1-1

Proper motion of the maser Proper motion of the maser

feature w.r.t. source Ifeature w.r.t. source I (-0.7 mas, -4.6 mas): 9.7 kms(-0.7 mas, -4.6 mas): 9.7 kms-1-1

Jet from IRc2/source I?Jet from IRc2/source I? Further analysis for other spots Further analysis for other spots

Proper motion of Orion KLProper motion of Orion KL

1313

Nearest cluster forming regionNearest cluster forming region Chain of dark clouds and HII regions, and OB associatioChain of dark clouds and HII regions, and OB associatio

nsns

Distance to dark clouds (Cernis 1993)Distance to dark clouds (Cernis 1993)

　　　　　　　　　　　　　　　　　　　　　　　　　 　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　 Distribution oDistribution of molecular clouds f molecular clouds

= Av map (Ridge et al. 2006)= Av map (Ridge et al. 2006)

Perseus complexPerseus complex

Taurus

B1 IC348NGC1333

PerOB2L1448

NGC1333B1

B1E

IC348

B5

HD278942

Per OB2

1414

Nearby low-mass SFRNearby low-mass SFR Cernis (1989): Cernis (1989):

extinction --- 220 pcextinction --- 220 pc de Zeeuw et al. (1999): de Zeeuw et al. (1999):

HIPPARCOS (Per OB) HIPPARCOS (Per OB)

--- 318+/-27 pc--- 318+/-27 pc Cluster of YSOsCluster of YSOs Numbers of HH flowsNumbers of HH flows

SII and HI image SII and HI image

(Bally et al. 1996)(Bally et al. 1996)

NGC1333NGC1333

HH7-11

10’

1515

Hirota et al. 2008, PASJ, in pressHirota et al. 2008, PASJ, in press 4.25+/-0.32 mas =235+/-18 pc4.25+/-0.32 mas =235+/-18 pc

H2O masers in NGC1333H2O masers in NGC1333

1616

We measured We measured absoluteabsolute proper motion of H2O masers proper motion of H2O masers IntrinsicIntrinsic proper motion of H2O masers? proper motion of H2O masers?

Galactic rotation: (-0.65, 0.49) mas yrGalactic rotation: (-0.65, 0.49) mas yr-1-1 negligible negligible Remove Solar motion of (U,V,W)=(10.00,5.25,7.17) km sRemove Solar motion of (U,V,W)=(10.00,5.25,7.17) km s-1 -1

Proper motion of NGC1333Proper motion of NGC1333

Effect of Solar Motion

1717

Proper motion of H2O masers w.r.t. LSRProper motion of H2O masers w.r.t. LSR Disk? Jet?Disk? Jet?

Prpper motion of VLA4A w.r.t. LSR =0 ?Prpper motion of VLA4A w.r.t. LSR =0 ? To be measured with VLA and/or IR?To be measured with VLA and/or IR?

Proper motion of NGC1333Proper motion of NGC1333

1818

Optical proper motion of HH7-11 Optical proper motion of HH7-11 Proper motions w.r.t. reference stars in NGC1333Proper motions w.r.t. reference stars in NGC1333 IR IR absoluteabsolute proper motion measurements possible? proper motion measurements possible?

Proper motion measurements

with HST of HH7-11 (Noriega-

Crespo & Garnavich 2001)

Proper motion of HH7-11Proper motion of HH7-11

1919

H2O masers in IRAS 16293-2422H2O masers in IRAS 16293-2422 Distance measured with 1% accuracy (VLBA: Claussen)Distance measured with 1% accuracy (VLBA: Claussen)

Radio continuum sources in TaurusRadio continuum sources in Taurus 147.6+/-0.6, 132.8+/-0.5, 128.5+/-0.6 pc (VLBA, Loinard et al., Torres et al. ) (VLBA, Loinard et al., Torres et al. )

Radio continuum source in Orion Nebula ClusterRadio continuum source in Orion Nebula Cluster 389 +24/-21389 +24/-21 pc pc ((Sandstrom et al. 2007)et al. 2007)

Radio continuum sources in Orion Nebula ClusterRadio continuum sources in Orion Nebula Cluster 414+/-7 pc414+/-7 pc (Menten et al. 2007) (Menten et al. 2007)

3 papers on distance measurements of Orion!3 papers on distance measurements of Orion!

Other researchesOther researches

2020

H2O masers in SFRs within 1 kpc from the SunH2O masers in SFRs within 1 kpc from the Sun Orion-Monoceros Molecular Cloud complexOrion-Monoceros Molecular Cloud complex TaurusTaurus PerseusPerseus OphiuchusOphiuchus SerpensSerpens Cepheus-CassiopeiaCepheus-Cassiopeia

Structure of Local arm? Structure of Local arm?

Nearby SFRs projectNearby SFRs project

Distribution of observed Distribution of observed maser sourcesmaser sources

2121

SummarySummary

Annual parallax and proper motion of Orion KL Annual parallax and proper motion of Orion KL

and NGC1333 were successfully measured. and NGC1333 were successfully measured. We have not yet analyzed the kinematics (jet/disk?)We have not yet analyzed the kinematics (jet/disk?)

of Orion KL and NGC1333. of Orion KL and NGC1333.

We aim to reveal structure and dynamics of Local arm. We aim to reveal structure and dynamics of Local arm.

We need absolute proper motion measurements of We need absolute proper motion measurements of powering sources of masers to understand the origin powering sources of masers to understand the origin of the masers --- IR astrometry!of the masers --- IR astrometry!