1999/12/15 by О. В. Верходанов, O. V. Verkhodanov, Verkhodanov, O. V. +4
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #GNSS positioning and interference #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9912331
6 pages, 4 figures, uses psfig.sty. This was the poster as presented on IAU Symp 1999. The final proceedings contribution will be submitted later
arxiv created 1999/12/15 · openalex publication_date 1999/12/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We describe a method to construct continuum spectra for radio sources on the basis of entries from various source catalogues in comparatively large error boxes around a given sky position. Sources from the UTR-2 catalogue (Braude et al. 1978--1994), observed at decametric wavelengths (10--25 MHz) with an antenna beam of about 40', were cross-identified with entries from other radio catalogues at higher frequencies. Using the CATS database we extracted all sources within 40' around UTR positions to find candidate identifications. A spectrum for each source was fitted with a set of curves using a least-squares method to find the best fit. We preferentially selected radio counterparts whose radio spectrum extrapolated to low frequencies matched the UTR decametric flux densities, and whose coordinates were close to the gravity center of UTR positions. Among all the 1822 sources in the UTR catalogue we found about 350 sources to be blends of two or more sources. As the most probable true coordinates of the radio counterparts we used positions from the NVSS, TXS, GB6, or PMN catalogues. Using low-frequency sources (26, 38, 85 MHz) from CATS we checked the reliability of some of our IDs. We show examples of the above methods, including raw and ``cleaned'' spectra.