A MOLECULAR SPIRAL ARM IN THE FAR OUTER GALAXY

@article{Dame2011AMS,
  title={A MOLECULAR SPIRAL ARM IN THE FAR OUTER GALAXY},
  author={Thomas M. Dame and Patrick Thaddeus},
  journal={The Astrophysical Journal},
  year={2011},
  volume={734}
}
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 molecular gas using the CfA 1.2 m telescope and detected CO at 10 of 220 positions. The detections are distributed along the arm from l = 13°, v = –21 km s–1 to l = 55°, v = –84 km s–1 and coincide with most of the main H I concentrations. One of the detections was fully mapped to reveal a large molecular… Expand

Figures and Tables from this paper

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
The Discovery of the Largest Gas Filament in Our Galaxy, or a New Spiral Arm?
  • Chong Li, K. Qiu, Bo Hu, Yue Cao
  • Physics
  • The Astrophysical Journal Letters
  • 2021
Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we detect a giant H i filamentary structure in the sky region of 307.°7 < α < 311.°0 and 40.°9 < δ < 43.°4. The structure has aExpand
The Distant Outer Gas Arm between l=35 and l=45
The Galactic plane has been mapped from l=34.75d to 45.25d and b=-5.25d to 5.25d in the CO (J=1-0) emission with the 13.7 m telescope of the Purple Mountain Observatory. The unbiased survey covers aExpand
The effect of spiral arms on star formation in the Galaxy
We have examined the ratio between the integrated luminosity of massive young stellar objects detected by the Red MSX Source (RMS) survey and the mass of molecular clouds in the Galactic Ring SurveyExpand
Trigonometric Parallaxes of Massive Star-forming Regions. IX. The Outer Arm in the First Quadrant
We report a trigonometric parallax measurement with the Very Long Baseline Array for the water maser in the distant high-mass star-forming region G75.30+1.32. This source has a heliocentric distanceExpand
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
PARALLAXES OF STAR-FORMING REGIONS IN THE OUTER SPIRAL ARM OF THE MILKY WAY
We report parallaxes and proper motions of three water maser sources in high-mass star-forming regions in the Outer Spiral Arm of the Milky Way. The observations were conducted with the Very LongExpand
THE SPIRAL ARMS OF THE MILKY WAY: THE RELATIVE LOCATION OF EACH DIFFERENT ARM TRACER WITHIN A TYPICAL SPIRAL ARM WIDTH
From the Sun's location in the Galactic disk, different arm tracers (CO, H I, hot dust, etc.) have been employed to locate a tangent to each spiral arm. Using all various and different observedExpand
The myth of the molecular ring
We investigate the structure of the Milky Way by determining how features in a spatial map correspond to CO features in a velocity map. We examine structures including logarithmic spiral arms, a ringExpand
High-Mass Star Formation in the Outer Scutum-Centaurus Arm
The Outer Scutum-Centaurus (OSC) spiral arm is the most distant molecular spiral arm in the Milky Way, but until recently little was known about this structure. Discovered by Dame and ThaddeusExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 13 REFERENCES
A New Spiral Arm of the Galaxy: The Far 3 kpc Arm
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 beExpand
Spiral Structure in the Outer Galactic Disk. I. The Third Galactic Quadrant
We combine optical and radio observations to trace the spiral structure in the third quadrant of the Milky Way. The optical observations consist of a large sample of young open clusters andExpand
Structural Variation of Molecular Gas in the Sagittarius Arm and Interarm Regions
We have carried out survey observations toward the Galactic plane at l Almost-Equal-To 38 Degree-Sign in the {sup 12}CO and {sup 13}CO J = 1-0 lines using the Nobeyama Radio Observatory 45 mExpand
Fermi observations of cassiopeia and cepheus: Diffuse gamma-ray emission in the outer galaxy
We present the analysis of the interstellar gamma-ray emission measured by the Fermi Large Area Telescope toward a region in the second Galactic quadrant at 100 deg < l < 145 deg and -15 deg < b <Expand
The Bolocam Galactic Plane Survey
The Bolocam Galactic Plane Survey (BGPS) is a 1.1 millimeter continuum survey of the northern Galactic Plane made with Bolocam and the Caltech Submillimeter Observatory. The coverage totals 170Expand
A Complete CO Survey of M31. I. Distribution and Kinematics
The 1.2 m millimeter-wave telescope at the Center for Astrophysics has been used to carry out the first complete CO survey of M31. At 115 GHz, the frequency of the J=1→0 transition observed, theExpand
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
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 Vertical Structure of the Outer Milky Way H I Disk
We examine the outer Galactic H i disk for deviations from the b ¼ 0 � plane by constructing maps of disk surface density, mean height, and thickness. We find that the Galactic warp is well describedExpand
NEW VELOCIMETRY AND REVISED CARTOGRAPHY OF THE SPIRAL ARMS IN THE MILKY WAY—A CONSISTENT SYMBIOSIS
Recent advances in the determinations of the positions (pitch angle, shape, numbers, interarm separation) and velocities (rotation curve) of the spiral arms are evaluated and compared to previousExpand
...
1
2
...