TRIGONOMETRIC PARALLAXES OF STAR FORMING REGIONS IN THE SCUTUM SPIRAL ARM

被引：72

作者：

Sato, M. ^{[1
]}

Wu, Y. W. ^{[1
,2
,3
]}

Immer, K. ^{[1
]}

Zhang, B. ^{[1
]}

Sanna, A. ^{[1
]}

Reid, M. J. ^{[4
]}

Dame, T. M. ^{[4
]}

Brunthaler, A. ^{[1
]}

Menten, K. M. ^{[1
]}

机构：

[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[2] Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China

[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 793卷 / 02期

基金：

欧洲研究理事会;

关键词：

astrometry; Galaxy: kinematics and dynamics; Galaxy: structure; masers; parallaxes; stars: formation; ULTRACOMPACT HII-REGIONS; EXTENDED GREEN OBJECTS; GHZ METHANOL MASERS; MILKY-WAY GALAXY; MOLECULAR CLOUDS; FUNDAMENTAL PARAMETERS; NEUTRAL HYDROGEN; DISTANCE; SAMPLE; GAS;

D O I：

10.1088/0004-637X/793/2/72

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report measurements of trigonometric parallaxes for six high-mass star-forming regions in the Scutum spiral arm of the Milky Way as part of the BeSSeL Survey. Combining our measurements with 10 previous measurements from the BeSSeL Survey yields a total sample of 16 sources in the Scutum arm with trigonometric parallaxes in the Galactic longitude range from 5 degrees to 32 degrees. Assuming a logarithmic spiral model, we estimate a pitch angle of 19 degrees.8 +/- 3 degrees.1 for the Scutum arm, which is larger than pitch angles reported for other spiral arms. The high pitch angle of the arm may be due to the arm's proximity to the Galactic bar. The Scutum arm sources show an average peculiar motion of 4 km s(-1) slower than the Galactic rotation and 8 km s(-1) toward the Galactic center. While the direction of this non-circular motion has the same sign as determined for sources in other spiral arms, the motion toward the Galactic center is greater for the Scutum arm sources.

引用

页数：15

共 73 条

[1]

Acord J. M., 1998, APJ, V495, P107

[2] MORPHOLOGY OF BAR ORBITS [J].

ATHANASSOULA, E .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1992, 259 (02) :328-344

[3]

Benjamin R. A., 2009, IAU S, V254, P319

[4] First glimpse results on the stellar structure of the galaxy [J].

Benjamin, RA ;

Churchwell, E ;

Babler, BL ;

Indebetouw, R ;

Meade, MR ;

Whitney, BA ;

Watson, C ;

Wolfire, MG ;

Wolff, MJ ;

Ignace, R ;

Bania, TM ;

Bracker, S ;

Clemens, DP ;

Chomiuk, L ;

Cohen, M ;

Dickey, JM ;

Jackson, JM ;

Kobulnicky, HA ;

Mercer, EP ;

Mathis, JS ;

Stolovy, SR ;

Uzpen, B .

ASTROPHYSICAL JOURNAL, 2005, 630 (02) :L149-L152

[5] The high-mass star-forming region IRAS 18182-1433 [J].

Beuther, H. ;

Zhang, Q. ;

Sridharan, T. K. ;

Lee, C. -F. ;

Zapata, L. A. .

ASTRONOMY & ASTROPHYSICS, 2006, 454 (01) :221-231

[6] 12.2 GHz survey towards 6.7 GHz methanol masers - A comparison of 12.2 GHz and 6.7 GHz spectra [J].

Blaszkiewicz, L ;

Kus, AJ .

ASTRONOMY & ASTROPHYSICS, 2004, 413 (01) :233-240

[7] THE MILKY WAY'S CIRCULAR-VELOCITY CURVE BETWEEN 4 AND 14 kpc FROM APOGEE DATA [J].

Bovy, Jo ;

Allende Prieto, Carlos ;

Beers, Timothy C. ;

Bizyaev, Dmitry ;

da Costa, Luiz N. ;

Cunha, Katia ;

Ebelke, Garrett L. ;

Eisenstein, Daniel J. ;

Frinchaboy, Peter M. ;

Perez, Ana Elia Garcia ;

Girardi, Leo ;

Hearty, Fred R. ;

Hogg, David W. ;

Holtzman, Jon ;

Maia, Marcio A. G. ;

Majewski, Steven R. ;

Malanushenko, Elena ;

Malanushenko, Viktor ;

Meszaros, Szabolcs ;

Nidever, David L. ;

O'Connell, Robert W. ;

O'Donnell, Christine ;

Oravetz, Audrey ;

Pan, Kaike ;

Rocha-Pinto, Helio J. ;

Schiavon, Ricardo P. ;

Schneider, Donald P. ;

Schultheis, Mathias ;

Skrutskie, Michael ;

Smith, Verne V. ;

Weinberg, David H. ;

Wilson, John C. ;

Zasowski, Gail .

ASTROPHYSICAL JOURNAL, 2012, 759 (02)

[8] The Bar and Spiral Structure Legacy (BeSSeL) survey: Mapping the Milky Way with VLBI astrometry [J].

Brunthaler, A. ;

Reid, M. J. ;

Menten, K. M. ;

Zheng, X. -W. ;

Bartkiewicz, A. ;

Choi, Y. K. ;

Dame, T. ;

Hachisuka, K. ;

Immer, K. ;

Moellenbrock, G. ;

Moscadelli, L. ;

Rygl, K. L. J. ;

Sanna, A. ;

Sato, M. ;

Wu, Y. ;

Xu, Y. ;

Zhang, B. .

ASTRONOMISCHE NACHRICHTEN, 2011, 332 (05) :461-466

[9] TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. V. G23.01-0.41 AND G23.44-0.18 [J].

Brunthaler, A. ;

Reid, M. J. ;

Menten, K. M. ;

Zheng, X. W. ;

Moscadelli, L. ;

Xu, Y. .

ASTROPHYSICAL JOURNAL, 2009, 693 (01) :424-429

[10] The Spitzer/GLIMPSE Surveys: A New View of the Milky Way [J].

Churchwell, Ed ;

Babler, Brian L. ;

Meade, Marilyn R. ;

Whitney, Barbara A. ;

Benjamin, Robert ;

Indebetouw, Remy ;

Cyganowski, Claudia ;

Robitaille, Thomas P. ;

Povich, Matthew ;

Watson, Christer ;

Bracker, Steve .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2009, 121 (877) :213-230

← 1 2 3 4 5 6 7 8 →