J/AJ/131/2525 MAGPIS 20cm survey (Helfand+, 2006)
MAGPIS: a Multi-Array Galactic Plane Imaging Survey.
Helfand D.J., Becker R.H., White R.L., Fallon A., Tuttle S.
<Astron. J., 131, 2525-2537 (2006)>
=2006AJ....131.2525H 2006AJ....131.2525H
ADC_Keywords: Galactic plane ; H II regions ; Radio continuum ;
Supernova remnants ; Surveys
Keywords: catalogs - Galaxy: general - H II regions - radio continuum: ISM -
supernova remnants - surveys
Abstract:
We present the Multi-Array Galactic Plane Imaging Survey (MAGPIS),
which maps portions of the first Galactic quadrant with an angular
resolution, sensitivity, and dynamic range that surpass existing radio
images of the Milky Way by more than an order of magnitude. The source
detection threshold at 20cm is in the range 12mJy over the 85% of
the survey region (5°<l<32°, |b|<0.8°) not covered by bright
extended emission; the angular resolution is ∼6". We catalog over 3000
discrete sources (diameters mostly <30") and present an atlas of ∼400
diffuse emission regions. New and archival data at 90cm for the whole
survey area are also presented. Comparison of our catalogs and images
with the Midcourse Space Experiment mid-infrared data allows us to
provide preliminary discrimination between thermal and nonthermal
sources. We identify 49 high-probability supernova remnant candidates,
increasing by a factor of 7 the number of known remnants with
diameters smaller than 5' in the survey region; several are pulsar wind
nebula candidates and/or very small diameter remnants (D<45").
Description:
Data are collected in the B, C, and D configurations of the VLA
operating in pseudocontinuum mode at 20cm. As part of our initial
observation program for MAGPIS, we obtained 3.5hr of 90cm
pseudocontinuum observations in the C configuration of the VLA during
2001 September.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 71 3149 Catalog of discrete sources
table3.dat 83 398 Catalog of diffuse emission regions
table4.dat 41 49 High-probability supernova remnant candidates
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See also:
II/56 : 100µm Survey of the Galactic Plane
II/270 : TCS-CAIN: NIR Survey of the Galactic Plane
(Cabrera-Lavers+, 2006)
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
J/ApJS/91/347 : A 5-GHz VLA Survey of the Galactic Plane (Becker+ 1994)
J/AJ/129/348 : Radio compact HII regions in the Milky Way (Giveon+, 2005)
J/AJ/130/156 : Galactic radio compact HII regions at 1.4GHz (Giveon+, 2005)
J/MNRAS/351/31 : XMM-Newton Galactic Plane Survey (XGPS) (Hands+, 2004)
J/A+A/397/21 : Galactic HII regions (Paladini+, 2003)
J/A+AS/83/539 : 21cm radio continuum survey. I. (Reich+ 1990)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- MAGPIS Source name
(MAGPIS GLL.lllll+B.bbbbb in Simbad) (G1)
18- 24 F7.2 mJy Fpeak Peak 20cm flux in units of mJy/beam
26- 32 F7.2 mJy Fint Integrated 20cm flux density
34 A1 --- f_Fint [E] Indicates that the Gaussian model is
inadequate and that the value is probably
inaccurate
36- 39 F4.2 mJy RMS The RMS of the 20cm observation
41- 44 F4.1 arcsec MajAxis Major axis (full-width at half-maximum) (1)
46- 49 F4.1 arcsec MinAxis Minor axis (full-width at half-maximum) (1)
51- 53 I3 deg PA Position angle of major axis
55 A1 --- l_F8um Limit flag on F8um
56- 62 F7.2 Jy F8um ? The 8um flux density (2)
64 A1 --- l_F21um Limit flag on F21um
65- 71 F7.2 Jy F21um ? The 21um flux density (2)
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Note (1): Of the elliptical Gaussian fit. The CLEAN beam (6.2"x5.4")
determines the size for unresolved sources.
Note (2): From the MSX6C catalog (Egan et al. 2003, Cat. V/114).
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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- 14 A14 --- MAGPIS Source name
(MAGPIS Diffuse GLL.llll+B.bbbb in Simbad) (G1)
16- 20 F5.1 arcmin Size Source box size
22- 26 F5.1 mJy Scale Intensity scaling factor for display
purposes (in units of mJy/beam)
28- 33 F6.1 mJy Fpeak Brightest 20cm flux pixel value
(in units of mJy/beam)
35- 41 F7.4 deg GLON Peak Galactic longitude
43- 49 F7.4 deg GLAT Peak Galactic latitude
51- 57 F7.3 mJy Fint Integrated 20cm flux density inside Size
59- 83 A25 --- SNR Known supernova remnants
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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- 14 A14 --- MAGPIS Source name
(MAGPIS SNR? GLL.llll+B.bbbb in Simbad) (G1)
16- 20 F5.1 arcmin Diam Source diameter
22- 26 F5.1 arcmin Size Source box size
28- 33 F6.1 mJy Fpeak Brightest 20cm flux pixel value
(in units of mJy/beam)
35- 41 F7.3 mJy Fint Integrated 20cm flux density inside Size
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Global Notes:
Note (G1): Where the source name is the Galactic l and b coordinates.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 03-Apr-2008