A New Spiral Arm of the Galaxy: The Far 3 kpc Arm

@article{Dame2008ANS,
  title={A New Spiral Arm of the Galaxy: The Far 3 kpc Arm},
  author={Thomas M. Dame and Patrick Thaddeus},
  journal={The Astrophysical Journal},
  year={2008},
  volume={683}
}
We report the detection in CO of the far-side counterpart of the well-known expanding 3 kpc arm in the central region of the Galaxy. In a CO longitude-velocity map at b = 0° the far 3 kpc arm can be followed over at least 20° of Galactic longitude as a faint lane at positive velocities running parallel to the near arm. The far arm crosses l = 0° at +56 km s−1, quite symmetric with the –53 km s−1 expansion velocity of the near arm. In addition to their symmetry in longitude and velocity, we find… Expand

Figures and Tables from this paper

A MOLECULAR SPIRAL ARM IN THE FAR OUTER GALAXY
We have identified a spiral arm lying beyond the Outer Arm in the first Galactic quadrant ~15 kpc from the Galactic center. After tracing the arm in existing 21 cm surveys, we searched for molecularExpand
Trigonometric parallaxes to star-forming regions within 4 kpc of the galactic center
We report four trigonometric parallaxes for high-mass star-forming regions within 4 kpc of the Galactic center. These measurements were made with the Very Long Baseline Array as part of the BeSSeLExpand
Detection of a radial velocity gradient in the extended local disc with RAVE
Using a sample of 213 713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2 kpc from the Sun and to |z| rsim 3 km s-1 kpc-1, where K and C are the Oort constantsExpand
MAJOR STRUCTURES OF THE INNER GALAXY DELINEATED BY 6.7 GHz METHANOL MASERS
We explore the longitude-velocity distribution of 6.7 GHz methanol masers in the context of the inner structure of our Galaxy. We analyze the correlation in velocities within this distribution andExpand
Trigonometric Parallaxes of Massive Star-Forming Regions: VII. G9.62+0.20 and the Expanding 3 KPC-ARM
We report a trigonometric parallax of 12 GHz methanol masers associated with the massive star forming region G9.62+0.20, corresponding to a distance of 5.2+-0.6 kpc. With a local standard of restExpand
High-Mass Star Formation in the Near and Far 3-KPC Arms
We report on the presence of 6.7-GHz methanol masers, known tracers of high-mass star formation, in the 3-kpc arms of the inner Galaxy. We present 49 detections from the Methanol Multibeam Survey,Expand
CATALOG OF OBSERVED TANGENTS TO THE SPIRAL ARMS IN THE MILKY WAY GALAXY
From the Sun's location in the Galactic disk, one can use different arm tracers (CO, H I, thermal or ionized or relativistic electrons, masers, cold and hot dust, etc.) to locate a tangent to eachExpand
Photometric distances to young stars in the inner galactic disk
We present results of the first extensive and deep CCD photometric survey carried out in the field of the open cluster Trumpler 27, an object in the constellation of Sagittarius not far from theExpand
TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. VI. GALACTIC STRUCTURE, FUNDAMENTAL PARAMETERS, AND NONCIRCULAR MOTIONS
We are using the Very Long Baseline Array and the Japanese VLBI Exploration of Radio Astronomy project to measure trigonometric parallaxes and proper motions of masers found in high-mass star-formingExpand
GIANT MOLECULAR CLOUDS AND MASSIVE STAR FORMATION IN THE SOUTHERN MILKY WAY
The Columbia University-Universidad de Chile CO Survey of the southern Milky Way is used to separate the CO(1-0) emission of the fourth Galactic quadrant within the solar circle into its dominantExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 20 REFERENCES
First GLIMPSE Results on the Stellar Structure of the Galaxy
The GLIMPSE (Galactic Legacy Mid-Plane Survey Extraordinaire) Point Source Catalog of ~30 million mid-infrared sources toward the inner Galaxy, 10° ≤ |l| ≤ 65° and |b| ≤ 1°, was used to determine theExpand
The VLA Galactic Plane Survey
The VLA Galactic Plane Survey (VGPS) is a survey of H I and 21 cm continuum emission in the Galactic plane between longitude 18° and 67° with latitude coverage from |b| < 13 to |b| < 23. The surveyExpand
The Milky Way in Molecular Clouds: A New Complete CO Survey
New large-scale CO surveys of the first and second Galactic quadrants and the nearby molecular cloud complexes in Orion and Taurus, obtained with the CfA 1.2 m telescope, have been combined with 31Expand
Gas dynamics in the Milky Way: second pattern speed and large-scale morphology
We present new gas flow models for the Milky Way inside the solar circle. We use smoothed particles hydrodynamics (SPH) simulations in gravitational potentials determined from the near-infrared (NIR)Expand
The Southern Galactic Plane Survey: H I Observations and Analysis
We describe the H I component of the Southern Galactic Plane Survey (SGPS). The SGPS is a large-scale project to image at arcminute resolution the H I spectral line and 21 cm continuum emission inExpand
Understanding the kinematics of Galactic Centre gas
A coherent picture is constructed on the Galaxy's H I, CO and CS emissions in the region |l| ≤ 10°, |b| ≤ 0.5°. The flow of gas at the Galactic Centre is dominated by a bar that has corotation at r =Expand
Direct evidence for a bar at the Galactic center
The bar at the center of the Milky Way, long postulated from a number of different studies, is unambiguously detected in the 2.4 μm observations of the Galactic center of Matsumoto et al. We modelExpand
Carbon monoxide in the inner galaxy
Emission from the J=1..-->..0 rotational transition of /sup 12/C/sup 16/O has been surveyed at b=0/sup 0/ in the region 10/sup 0/> or =l> or =352/sup 0/ with high angular (..delta..l=0/sup 0/.2,Expand
A large scale CO survey of the Galactic center region
We present the data from a CO($J=1\rightarrow 0$) survey of the central region of our Galaxy. The observations were obtained with the 1.2-m Southern Millimeter-wave Telescope at Cerro TololoExpand
Galactic Dynamics
Two of the world’s leading astrophysicists, James Binney and Scott Tremaine, here present a comprehensive review of the theory of galactic dynamics at a level suitable for both graduate students andExpand
...
1
2
...