FCRAO CO Survey of the Outer Galaxy
While comprising only a small fraction of the volume of the interstellar
medium, molecular clouds are an important component since these
are the sites of star formation within the Galaxy.
Large scale, unbiased surveys are required to determine
the distribution of molecular material within the Galaxy and to
statistically evaluate cloud properties from which the appropriate
physics can be applied.
However, previous surveys of the CO J=1-0 emission, the
primary tracer of molecular hydrogen, from
the first quadrant of the Galaxy have been limited by the blending
of emission from unrelated clouds due to Galactic rotation.
The Five College Radio Astronomy Observatory has completed
ambitious survey to image CO J=1-0 emission from the
second quadrant of the Galaxy where such cloud blending is absent
The survey covers 330 square degrees at 50 arcsec sampling
using the 15 element focal plane array receiver QUARRY. The data
provides unprecedented information to address fundamental questions
of the molecular interstellar medium and galactic structure.
These include the large scale topology of the molecular component,
the enhancement of molecular gas surface density within spiral arms,
and the mostly unexplored relationship between the molecular and
atomic gas components.
The following image shows the distribution of peak CO antenna temperature
within the velocity interval -105 to 5 km/sec measured from
Image of integrated 12CO emission from the outer Galaxy taken with the
telescope and QUARRY.
Publications from the Survey:
'' A Massive Cometary Cloud Associated with IC 1805 ''
1996, ApJ, 464, L175
''A Massive Cometary Cloud Associated with IC 1805: Erratum''
1996, ApJ, 464, L139
''The Five College Radio Astronomy Observatory CO Survey of the Outer Galaxy''
1998, ApJS, 115, 241
''The Anatomy of the Perseus Spiral Arm: 12CO and IRAS Imaging
Observations of the W3-W4-W5 Cloud Complex''
1998, ApJ, 502, 265
A listing of the cloud catalog used in this paper is available by clicking
''On the Fractal Structure of Molecular Clouds''
1998, AA, 336, 697
''JCMT Observations of Molecular Clouds in the Galactic Chimney Near W4''
1999, ApJ, 513, 339
''Embedded Stellar Clusters in the W3/W4/W5 Molecular Cloud
2000, ApJS, 130, 381
''The HII Region KR 140: Spontaneous Formation of a High Mass Star''
2000, ApJ, 539, 283
''A New View of Cold HI Clouds in the Milky Way''
2000, ApJ, 540, 851
'' The Equilibrium State of Molecular Regions in the Outer Galaxy''
2001, ApJ, 551, 852
''GSH 138-01-94: An Old Supernova Remnant in the Far Outer Galaxy''
2001, ApJ, 563, 816
''The Supernova Remnant CTB 104A: Magnetic Field Structure and Interaction with the Environment''
2002, ApJ, 565, 1022
''Interstellar Turbulence: I. Retrieval of Velocity Field Statistics''
2002, ApJ, 566, 276
''Interstellar Turbulence: II. Energy Spectra of
Molecular Regions in the Outer Galaxy''
2002, ApJ, 566, 289
''Infrared Clusters in the Far-Outer Galaxy''
2002, ApJ, 578, 229
''Molecular Cloud Distances via Principal Component Analysis''
2002, ApJ, 567 L41
''The Distance to Supernova Remnant CTB 109 Deduced from Its Environment''
2002, ApJ, 576, 169
''Detecting Embedded Intermediate-Mass Stars Using Mid-Infrared and H I 21 Centimeter Emission''
2002, AJ, 124, 3449
''An Outer Galaxy Molecular Cloud Catalog''
2003, ApJS, 144, 47
''Large-Scale Turbulence in Molecular Clouds''
2003, ApJ, 583, 280
''The Universality of Turbulence in the Molecular Interstellar Medium and Its Exploitation as a Distance Estimator''
2003, ApJ, 584, 293
''The association of IRAS sources and 12CO emission in the outer Galaxy''
2003, AA, 399, 1083
''Large-Scale Structure and Dynamics of Cassiopeia OB7''
2003, AJ, 125, 2050
Download Survey Data
The Survey is available as a series of two dimensional
at the following archive centers.
NCSA Astronomy Digital
On the QUERY
page , be sure to include
the survey filter in the search.
To get the data by
use the codeword: 97.MH.01
NASA Astronomical Data Center
Last Modified : Wednesday, 22-Jan-97 16:25:59 EST