Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/cats/~satr/RFSymp/abs/34_Trushkin.pdf Дата изменения: Mon Oct 9 11:39:04 2006 Дата индексирования: Tue Oct 2 10:01:59 2012 Кодировка: Поисковые слова: wmap

NEW WMAP CATALOG SOURCES OR HOW MANY BRIGHT SOURCES ARE ON THE SKY
S.A. Trushkin Sp ecial Astrophysical Observatory of RAS, Nizhnij Arkhyz, Russia satr@@sao.ru We continued studies of the WMAP-sources after publishing results of three years (Hinshaw et al.; Jarosik et al.; Page et al.; Sp ergel et al. 2006). Trushkin (2003) presented compiled radio sp ectra of 205 extragalactic sources from the catalog, compiled from the WMAP survey data at 23-94 GHz in the first year of its op eration. We have shown that 205 WMAP-sources are reliably identified with radio sources from known catalogs (FIRST, NVSS and so on). 50% of the sources have flat or inverted sp ectra, 15% ­ sp ectra with the p eaks at 5-20 GHz (GPS-sources), 10% ­ p ower-law sp ectra and 10% ­ show the comp osite sp ectra (as 3C84). We discussed recent results of the radio observations of the AGNs from the WMAP catalog with the RATAN-600 and RT32 telescop es. Now the final 3-year catalog contains 323 sources, while four identified sources from the former version were not included in the new one. Using again the search select and match and sp ectra plotting pro cedures in our CATS data base (Verkho danov et al. 1997) we have found optical and radio identifications for the most of new 120 WMAP-sources from the radio and optical catalogs in the CATS data base. Now we discuss results for new 120 sources, their sp ectra and features. The statistics for typ es of the sources did not generally changed. We have found that 313 WMAP-sources have optical counterparts: 220 ­ quasars, 30 ­ galaxies, 32 ­ AGNs, 30 ­ BL Lac ob jects and one ­ the planetary nebula IC418. We have observed some of the new WMAP-sources with RT32 (IAA) at 2.3 and 8.5 GHz. Comparison fluxes from the first version catalog and second one allows us to estimate of the variability of the sample. As was exp ected, the index of the variability at 63 GHz is higher than at 23 GHz. There are the sources with 100% changes of the fluxes on the effective time scale ab out one year, (3yr-1yr)/2 in the WMAP3-catalog. Using an analogous metho d of the source selection from the CATS data base we have found that a probable numb er of the sources brighter 400 mJy at 23 GHz is equal to 13001500 on the sky. Thus there is a strong effect of confusion dramatically decreasing the numb er (323) of detected sources in the WMAP survey. We hop e that such studies will help in the future PLANCK CMB-exp eriment dataprecessing. Acknow ledgements. We are thankful to RFBR for supp ort, the grant N05-02-17556. References Hinshaw G. et al.: astro-ph/0603451. Jarosik N. et al.: astro-ph/0603452. Page L. et al.: astro-ph/0603450. Sp ergel D.N. et al.: astro-ph/0603449. Trushkin S.A.: Bul letin of SAO RAS, 2003, 55, 90. Verkho danov O.V., Trushkin S.A., Andernach H., Chernenkov V.N.: ASP Conference Series, 1997, 125, 322.