J/ApJS/155/421 Survey of Galactic Center region at 20cm (Yusef-Zadeh+, 2004)
A 20 centimeter survey of the Galactic Center region.
I. Detection of numerous linear filaments.
Yusef-Zadeh F., Hewitt J.W., Cotton W.
<Astrophys. J. Suppl. Ser., 155, 421-550 (2004)>
=2004ApJS..155..421Y 2004ApJS..155..421Y
ADC_Keywords: Radio sources ; Surveys
Keywords: Galaxy: center - ISM: clouds - ISM: general - shock waves -
supernova remnants
Abstract:
This is the first in a series of papers presenting a sensitive 20cm
VLA continuum survey of the Galactic center region using new and
archival data based on multiconfiguration observations taken with
relatively uniform uv coverage. The high dynamic range images cover
the regions within -2°<l<5° and -40'<b<40' with a spatial
resolution of ∼30" and 10". The wide field imaging technique is used
to construct a low-resolution mosaic of 40 overlapping pointings. The
mosaic image includes the Effelsberg observations filling the low
spatial frequency uv data. We also present high-resolution images of
23 overlapping fields using DnC and CnB array configurations. These
high-resolution images are sensitive to both compact and extended
continuum features with a wide range of angular scales with rms noise
of 0.2mJy/beam in the outer parts of the Galactic center region. The
survey has resulted in a catalog of 345 discrete sources as well as
140 images revealing structural details of HII regions, supernova
remnants, pulsar wind nebulae, and more than 80 linear filaments
distributed toward the complex region of the Galactic center.
Description:
We have used 40 overlapping 20cm fields based on archival and new VLA
observations in its compact, hybrid array configuration. Nine of the
pointings were carried out on 2003 January 30 using the compact DnC
array configuration of the VLA.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 40 Low-resolution VLA pointings combined with
Effelsberg data at 20cm
table2.dat 73 23 High-resolution VLA pointings at 20cm
table3.dat 59 84 A list of radio filaments at 20cm
refs.dat 85 17 References
table4.dat 123 345 20cm Survey Point Source Catalog
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See also:
J/AJ/128/1646 : The Galactic Center region at 330MHz (Nord+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Field Field number
4- 10 F7.3 deg GLON Galactic longitude
12- 17 F6.3 deg GLAT Galactic latitude
19- 20 I2 h RAh Hour of Right Ascension (J2000)
22- 23 I2 min RAm Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- Sign of the Declination (J2000)
32- 33 I2 deg DEd Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of Declination (J2000)
43- 46 F4.1 mJy rms rms noise
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Field Field number
4- 10 F7.3 deg GLON Galactic longitude
12- 17 F6.3 deg GLAT Galactic latitude
19- 20 I2 h RAh Hour of Right Ascension (J2000)
22- 23 I2 min RAm Minute of Right Ascnesion (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- Sign of the Declination (J2000)
32- 33 I2 deg DEd Degree of the Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of the Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of the Declination (J2000)
43- 46 F4.2 mJy rms rms noise
48- 51 F4.1 arcsec res1 Resolution of image
52 A1 --- --- [x]
53- 55 F3.1 arcsec res2 Resolution of image
57- 59 I3 deg PA [-90,90] Position angle
61- 73 A13 --- Note Note on the VLA array configuration
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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- 9 A9 --- Source Designation of radio filament
11- 14 A4 --- Label Label of nomenclature used on figures
16- 28 A13 --- GName Identifier (also Galactic coordinates)
29 A1 --- NTRF [YN] Detection of nonthermal radio filaments
31- 34 F4.1 arcmin length Length of the filament
36- 38 I3 deg PA Position angle (in Galactic frame)
40- 46 F7.2 mJy S20cm ? Flux density at 20cm (1.5GHz)
48- 53 F6.2 mJy e_S20cm ? Error in S20cm
55- 59 A5 --- Refs References to previously identified radio
filaments, detailed in file refs.dat
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- Bibcode Bibcode
24- 43 A20 --- Aut Author's name
45- 84 A40 --- Com Comment
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- GName Source name (also Galactic coordinates)
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 28 F8.5 s RAs Second of Right Ascension (J2000)
30- 37 F8.5 s e_RAs Error in RAs
39 A1 --- DE- Sign of the Declination (J2000)
40- 41 I2 deg DEd Degree of Declination (J2000)
43- 44 I2 arcmin DEm Arcminute of Declination (J2000)
46- 52 F7.4 arcsec DEs Arcsecond of Declination (J2000)
54- 62 F9.5 arcsec e_DEs Error in DEs
64- 71 F8.4 mJy Sp20cm Peak flux density at 20cm, in units of mJy/beam
73- 81 F9.6 mJy e_Sp20cm Error in Sp20cm
83- 92 F10.5 mJy Si20cm Integrated flux density at 20cm
94-102 F9.5 mJy e_Si20cm Error in Si20cm
104-108 F5.2 arcsec MajAxis ? Major axis
110-115 F6.3 arcsec MinAxis ? Minor axis
117-119 I3 deg PA [-90,178]? Position angle (in Galactic frame)
121-122 I2 --- Field Field number
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 12-Oct-2005