منابع مشابه
Radiative age mapping of the remnant radio galaxy B2 0924+30: the LOFAR perspective
We have observed the steep spectrum radio source B2 0924+30 using the LOw Frequency ARray (LOFAR) telescope. Hosted by a z=0.026 elliptical galaxy, it has a relatively large angular size of 12′ (corresponding to 360 kpc projected linear size) and a morphology reminiscent of a remnant Fanaroff-Riley type II (FRII) radio galaxy. Studying active galactic nuclei (AGN) radio remnants can give us ins...
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Let Qn be the random number of comparisons made by quicksort in sorting n distinct keys, when we assume that all n! possible orderings are equally likely. Known results concerning moments for Qn do not show how rare it is for Qn to make large deviations from its mean. Here we give a good approximation to the probability of such a large deviation, and find that this probability is quite small. A...
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A long standing question in radio astronomy has been why some elliptical galaxies host strong radio sources and others not. The reason may have something to do with the physical conditions near the (active) nucleus from which the radio source emanates. The resolution of HST images is such that dust features close to the nucleus can be detected, and these may often be in the form of circumnuclea...
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Cross-correlations of theWilkinson Microwave Anisotropy Probe (WMAP) full sky K-, Ka-, Q-, V-, and W-band maps with the 1.4 GHz NVSS source count map and the HEAO I A2 2–10 keV full sky X-ray flux map are used to constrain rms fluctuations due to unresolved microwave sources in theWMAP frequency range. In the Q band (40.7 GHz), a lower limit, taking account of only those fluctuations correlated...
متن کاملThe ATESP radio survey III . Source counts
This paper is part of a series reporting the results of the ATESP radio survey obtained at 1.4 GHz with the Australia Telescope Compact Array. The survey consists of 16 radio mosaics with ∼ 8 ′′ × 14 ′′ resolution and uniform sensitivity (1σ noise level ∼79 µJy) over the whole area of the ESO Slice Project redshift survey (∼ 26 sq. degrees at δ ∼ −40 •). The ATESP survey has produced a catalogu...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1976
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/174.1.5p