A deep survey of Abell 2218 at 408 and 1407 MHz; 5C 20
نویسندگان
چکیده
منابع مشابه
The 408 MHz B 3 . 2 survey
We present a new 408MHz survey (B3.2) carried out with the “Croce del Nord” radiotelescope in Bologna. The survey coordinates limits are −2◦00′ to +2◦15′ in Dec. and 21h to 24h, 00h to 17h in R.A., equivalent to 0.388 sr. The B3.2 is complete to 0.15 Jy but many sources down to 0.1 Jy are included. Our aim was to select a new and complete sample of Ultra Steep Spectrum (USS) radio sources, as t...
متن کاملThe 408 MHz B 3 . 1 Survey
We present a new 408 MHz survey (B3.1) carried out with the " Croce del Nord " radiotelescope in Bologna. The survey coordinates limits are −2 • 00 ′ to +2 • 15 ′ in Dec. and 21h to 24h, 00h to 17h in R.A., equivalent to 0.388 sr. The B3.1 is complete to 0.15 Jy but many sources down to 0.1 Jy are included. Our aim was to select a new and complete sample of Ultra Steep Spectrum (USS) radio sour...
متن کاملA Deep, High-resolution Survey at 74 Mhz
We present a 74 MHz survey of a 165 deg2 region located near the north Galactic pole. This survey has an unprecedented combination of both resolution (2500 FWHM) and sensitivity ( as low as 24 mJy beam 1). We detect 949 sources at the 5 level in this region, enough to begin exploring the nature of the 74 MHz source population. We present differential source counts, spectral index measurements, ...
متن کاملThe dwarf galaxy population in Abell 2218
We present results from a deep photometric study of the rich galaxy cluster Abell 2218 (z = 0.18) based on archival HST WFPC2 F606W images. These have been used to derive the luminosity function to extremely faint limits (MF606W ≈ −13.2 mag, μ0 ≈ 24.7mag arcsec ) over a wide field of view (1.3 h Mpc). We find the faint-end slope of the luminosity function to vary with environment within the clu...
متن کاملA Correlation Interferometer for 408 MHz
One day in the 1980’s I was helping a visiting scientist get his experiment set up at a remote site to the west of Ottawa. This site contained the decaying remains of decades of radio experiments. Among some trees I found an old shed, crammed to the roof with yagi antennas, combiners, hybrids and many matched lengths of heliax coaxial cable. Many were broken, but mixed in with the debris were s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1986
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/222.4.731