J/AJ/154/156 High resolution survey of Galactic plane at 408 MHz (Tung+, 2017)
A high resolution survey of the Galactic plane at 408 MHz.
Tung A.K., Kothes R., Landecker T.L., Geisbusch J., Del Rizzo D.,
Taylor A.R., Brunt C.M., Gray A.D., Dougherty S.M.
<Astron. J., 154, 156 (2017)>
=2017AJ....154..156T 2017AJ....154..156T (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Galactic plane ; Interstellar medium ; Radio continuum
Keywords: ISM: general - ISM: structure - radio continuum: general - surveys
Abstract:
The interstellar medium is a complex "ecosystem" with gas constituents
in the atomic, molecular and ionized states, dust, magnetic fields,
and relativistic particles. The Canadian Galactic Plane Survey has imaged
these constituents at multiple radio and infrared frequencies with
angular resolution of the order of arcminutes. This paper presents
radio continuum data at 408 MHz over the area of 52°=<l=<193°,
-6.5°=<b=<8.5°, with an extension to b=21° in the range of
97°=<l=<120°, with angular resolution 2.8'x2.8' cosecδ.
Observations were made with the Synthesis Telescope at the Dominion
Radio Astrophysical Observatory as part of the Canadian Galactic Plane
Survey. The calibration of the survey using existing radio source
catalogs is described. The accuracy of 408 MHz flux densities from the
data is 6%. Information on large structures has been incorporated into
the data using the single-antenna survey of Haslam et al.
(1982A&AS...47....1H 1982A&AS...47....1H). The paper presents the data, describes how it
can be accessed electronically, and gives examples of applications of
the data to ISM research.
Description:
In this paper, we present that part of the survey observed at 408 MHz
(wavelength 73.4 cm) with the Synthesis Telescope at the Dominion
Radio Astrophysical Observatory (which we refer to as the DRAO ST,
described by Landecker et al. 2000A&AS..145..509L 2000A&AS..145..509L).
The DRAO ST employs relatively small antennas (diameter ∼9 m). The
field of view is wide, and the small antennas permit the telescope to
sample interferometer baselines as short as 12.9 m, corresponding to
spatial structures as large as ∼3° at 408 MHz.
The survey was carried out as a series of pointings of the telescope,
with data from each pointing processed into a separate image.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 167 7686 Calibration Source List
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See also:
VIII/42 : Texas Survey of radio sources at 365MHz (Douglas+ 1996)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VI/128 : Log of CGPS exposures (Taylor+, 2003-)
VIII/79 : The VLA Low-frequency Sky Survey at 74MHz (Cohen+ 2007)
J/other/AuJPA/14.77 : 408MHz galactic radio sources (Shaver+ 1970)
J/MNRAS/379/289 : The outer Galaxy at 1420 and 408MHz. II. (Kerton+, 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- NVSS NVSS identifier (NVSS JHHMMSS+DDMMSS in Simbad)
15- 16 I2 h RAh Hour of Right Ascension (J2000) (1)
18- 19 I2 min RAm Minute of Right Ascension (J2000) (1)
21- 25 F5.2 s RAs Second of Right Ascension (J2000) (1)
27 A1 --- DE- Sign of the Declination (J2000) (1)
28- 29 I2 deg DEd Degree of Declination (J2000) (1)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000) (1)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
39- 46 F8.5 Jy S408 [0.10841/14.18606] Interpolated 408 MHz flux
density (2)
48- 56 E9.3 Jy e_S408 Uncertainty in S408 (2)
58- 63 F6.4 Jy S1420 [0.0267/6.0808] The 1420 MHz flux density
65- 73 E9.3 Jy e_S1420 Uncertainty in S1420
75- 82 F8.5 Jy S365 [0.12595/15.89882] The 365 MHz flux density
84- 90 F7.5 Jy e_S365 [0.01561/0.20194] Uncertainty in S365
92- 96 F5.2 Jy S74 [0.46/63.5] The 74 MHz flux density
98-101 F4.2 Jy e_S74 [0.07/6.35] Uncertainty in S74
103-109 F7.5 Jy S1000 [0.04122/7.2291] The 1000 MHz flux density
111-119 E9.3 Jy e_S1000 Uncertainty in S10000
121-128 F8.5 --- alpha [-1.5463/-0.0281] Spectral index α
130-138 E9.3 --- e_alpha Uncertainty in alpha
140-147 E8.1 --- Cov The S1000, α covariance
149-158 E10.4 --- chi2 The χ2 of model fit
160-167 F8.5 --- sigma [0.00158/11.01408] The detection σ
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Note (1): From the NVSS catalog (Condon et al. 1998, Cat. VIII/65).
Note (2): From the NVSS (Condon et al. 1998, Cat. VIII/65), the 74 MHz VLA
Low-frequency Sky Survey (VLSS, Cohen et al. 2007, Cat. VIII/79) and
the 365 MHz Texas Survey of Radio Sources (Texas, Douglas et al.
1996, Cat. VIII/42).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 15-Jun-2018