The three-frequency radio survey of the Galactic plane has been made at 0.96, 3.9 and 11.2 GHz with the RATAN-600 radio telescope in three sets in 1991-1995 (Trushkin 1996b). The resolution (RA x DEC) is 4' x 75', 1' x 39', 21'' x 14' respectively. The noise level is typically 60, 10 and 100 mJy/beam at 0.96, 3.9 and 11.2 GHz respectively.
The total area of survey is near 400 degrees in square (0.12 sr). It is one third of the volume of the Galaxy in which the outbursts of supernova are possible. The coordinate accuracy estimated on the comparison with Bonn and Texas surveys is better than 15'' in R.A. Flux densities and spectral indices of near 40 known supernova remnants were measured (Trushkin, 1996a).
The preliminary list includes more than 1500 radio sources. The cross-identification, comparison, spectral index studies have been made with sim 1800 selected sources from Effelsberg, Nabeyama, VLA, PMN, Texas radio surveys and from the IRAS catalog and another radio catalogs, included in radio astronomical database CATS (Verkhodanov and Trushkin, 1994, 1996).
The search of the supernova remnants and variable radio sources has been made. Using the different criteria from the IRAS sources we searched the thermal sources: planetary nebulae and H II regions. We used ISSA (IPAC) infrared maps for comparison with the survey data. Some supernova remnant candidates have been found in survey area when we used IR/Radio criterion. G11.2-1.1 seems one of good SNR candidates.
The superluminal variable source and X-nova GRO J1655-40 has been detected (in 1991.2) in the survey at flux level 100 +-10mJy at 3.9 GHz far before the identification at radio wavelengths. The extended radio envelope has been detected around this source. Its spectrum is non-thermal (alpha=~-0.6) and size is near 6'. Its origin could be connected either with associated supernova remnant or with blow-up envelope from central active source (Trushkin, 1995).
The interesting point source 1820-239 was identified in the confirmed shell SNR G8.7-5.0. It has a non-thermal spectrum, alpha=-0.4 and size < 1'. The sequential sets of the Galactic survey in other epochs allowed to detect the variability of flux from this source on time scale of 3--4 months. Thus 1820-239 seems to be analogous to the Galactic binary systems such as SS433 and Cir X-1.
Then we have made the cross-identification of two catalogs: the Texas and IRAS-point source in the database CATS (Trushkin and Verkhodanov, 1995). 97 sources of the total 1208 pairs fall in the survey area. All 63 such sources with S_nu (365 MHz) > 0.4 Jy were detected at 3.9 GHz.
In Fig.1 the same cross-cuts of survey on DEC50: -21^o 40' at three wavelengths. The compact HII region 1800-217 and remnant of SN1604 (Kepler's SN) 1727-215, the latest from optically visible for last 400 years.
The work has been supported by the grant of the Russian Foundation of the Basic Researches N93-02-17086 and the travel RFBR grant N96-02-27170. This report became also possible due to hospitality of STSI and the LOC of IAU symposium N179.
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Verkhodanov, O. V., Trushkin, S. A. 1994, Preprint SAO RAS, N106, 1
Verkhodanov, O.V., Trushkin, S.A. 1996, Baltic Astronomy, in press
The survey cross-cut of Milky Way (Dec.=-21^o 40', |b|<5.5) at three wavelengths. The extended Galactic background is good seen on these scans.