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Astrron. Astrophys. 241, 551-580
The Cygnus X region XVIII. A detailed investigation of radio-continuum
structure on large and small scales
Wendker H.J., Higgs L.A. and Landecker T.L.
Abstract
The Cygnus X region has been observed at 408 and 1420 MHz with
angular resolution 3.5x5.2 and 1.0x1.5 arcmin.
Maps of continuum emission at these two frequencies are presented. The 408
MHz map, covering a 9^o field, has been compared with the 4800 MHz data of
Wendker (1984). A map of temperature spectral index (beta) has been compuded
over the area common to the two observations. The emission from Cygnus X
is primarily optically thin thermal radiation, superimposed on a smooth
non-thermal background of brightness 50+- 10 K at 408 MHz with beta = 2.8.
The properties of the known supernova remnant G78.2+2.1 are discussed in
detail. Properties of small-diameter sources at 408, 1420 and 4800 MHz
are tabulated, and some are discussed in detail, including a possible new
new supernova remnant and a thermal shell source, possibly a wind-blown bubble.
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4.1 The source list
The resulting source lists are presented in Tables 2,3 and 4 for
408, 1420 and 4800 MHz respectively. The sources are disighated
as 18Pl (408 MHz), 19Pm (1420 MHz) and ECX6-n(4800 MHz),
ECX6 denotes Effelsberg Cygnus X Survey, 6 cm. The table entries are self
explanatory. If no size is given, the source was unresolved with the beam
used at that particular frequency. If sizes are given, they are the intrinsic
sizes of the sources, after correction for the beam.
Of the 101 sources detected at 408 MHz, 44 also appear in our 1420 and/or
4800 MHz lists, and something can be said of their nature.
The properties of the 44 common sources are sum. in Table 5. There are 24
non-thermal and 20 thermal sourecs. Of the 24 non-thermal sources, only two
are extended and only two are definitely galactic sources (SNR and radio
star). The remaining 21 point sources are probably all extragalactic.
Twelve of the thermal sources are extended.
Remarks:
18P19, 18P21, 18P35, 18P51, 18P57, 19P20, 19P45.