J/ApJS/262/5 A CO survey of the entire northern sky (Dame+, 2022)
A CO survey of the entire northern sky.
Dame T.M., Thaddeus P.
<Astrophys. J. Suppl. Ser., 262, 5 (2022)>
=2022ApJS..262....5D 2022ApJS..262....5D
ADC_Keywords: Molecular clouds; Carbon monoxide; Interstellar medium;
Molecular data; Surveys; Spectra, millimetric/submm
Keywords: Molecular clouds ; Diffuse molecular clouds ;
Interstellar molecules ; Interstellar line emission ;
Solar neighborhood
Abstract:
We present a very large extension of the Galactic plane CO survey of
Dame+ (2001ApJ...547..792D 2001ApJ...547..792D) to the entire northern sky
(δ>-17°). The extension was carried out with the same
telescope as was used for the plane survey, the CfA 1.2m, and
perfectly meshes with its irregular boundaries in latitude. A total of
382,202 CO(1-0) spectra uniformly sample the high-latitude sky with a
true-angle spacing of 0.25° or better. The final reduced and
folded spectra have a uniform sensitivity of 0.18K in 0.65km/s
channels and provide a velocity coverage of ±47.1km/s. We describe
the observational techniques and the data reduction and provide
various summary maps of the spatial and velocity distributions of CO
emission over the northern sky, and a catalog of the molecular clouds
we found there. We also describe the CO spectral line data cubes that
we have made available online.
Description:
The 1.2m Millimeter-Wave Telescope at the Center for Astrophysics
(CfA)| Harvard & Smithsonian has been observing the J=1-0 rotational
transition of interstellar carbon monoxide for nearly 50yr.
A map of velocity-integrated CO intensity over the entire northern sky
is shown in Figure 8. We have partitioned the emission in Figure 8
into 198 discrete high-latitude clouds (|b|>20°) and list their
properties in Table 2. Here we define clouds as regions of contiguous
emission. See Section 4.
All 382,202 CO(1-0) spectra are made available in a single FITS-format
data cube. In Table 3 we list five versions of the cube that are
publicly available. All of the cubes are on a rectangular Cartesian
grid of velocity, longitude, and latitude. See Section 5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 45 198 Molecular Clouds in the Northern Sky at |b|>20°
table3.dat 45 5 Publicly available spectral line data cubes
fig8/* . 1 *FITS image of the velocity-integrated CO intensity
over the entire northern sky
fits/* . 5 Individual FITS data cubes
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Note on fig8/*: The map was derived by integrating the combined
moment-masked cube (No. 5 in Table 3) over velocity from -36 to
36km/s, the full range over which significant emission is detected.
For cosmetic purposes, the map was interpolated to 1/8-deg spacing and
smoothed slightly by convolution with a 0.3deg Gaussian.
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See also:
J/ApJS/196/18 : CO survey of galactic molecular clouds. II. (Bieging+, 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/198] Identification number
5- 10 F6.2 deg GLON Galactic longitude of peak intensity
12- 17 F6.2 deg GLAT [-71.5/82] Galactic latitude of peak
intensity
19- 23 F5.1 km/s Vel [-33.4/28.5] LSR velocity of composite
spectrum
25- 28 F4.2 km/s dVel [0.2/4.1] Velocity dispersion of composite
spectrum
30- 34 F5.2 K.km/s Wco [0.58/68.2] Peak velocity-integrated CO
intensity
36- 41 F6.2 K.deg2.km/s Sco [0.06/187] Total CO luminosity integrated
over sky area and velocity
43- 45 I3 --- Nsig [3/282] Statistical significance of CO
luminosity
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 I1 --- Seq [1/5] Running sequence number
3- 22 A20 --- FileName Name of the FITS file in subdirectory "fits"
24- 26 I3 Mbyte Size [271/847] Size
28- 40 A13 km/s Vel Velocity range
42- 45 F4.2 K rms [0.18/0.26]? rms
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History:
From electronic version of the journal
DT22+DHT_masked.fits downloaded from:
http://lweb.cfa.harvard.edu/rtdc/CO/NorthernSkySurvey/
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Nov-2022