منابع مشابه
Optical Properties of faint FIRST Variable Radio Sources
A sample of 123 radio sources that exhibit significant variations at 1.4 GHz on a seven year base-line has been created using FIRST VLA B-array data from 1995 and 2002 on a strip at δ = 0 near the south Galactic cap. This sample spans the range of radio flux densities from ∼ 2 to 1000 mJy. It presents both in size and radio flux density range a unique starting point for variability studies of g...
متن کاملTwo variable radio sources near the position of GRB 940301
We report on the results of a search for a radio counterpart to the strong gamma-ray burst GRB 940301. Observations with the Westerbork Synthesis Radio Telescope of the Compton Telescope error box region of GRB 940301 began on March 4, 1994, at 21 cm and April 2, 1994, at 92 cm. No flux density variations were detected at 92 cm above S = 10 mJy (5 σ) within a period of 1 to 4 months after the b...
متن کاملEstimating the Number of Wideband Radio Sources
In this paper, a new approach for estimating the number of wideband sources is proposed which is based on RSS or ISM algorithms. Numerical results show that the MDL-based and EIT-based proposed algorithm havea much better detection performance than that in EGM and AIC cases for small differences between the incident angles of sources. In addition, for similar conditions, RSS algorithm offers hi...
متن کاملYoung Extragalactic Radio Sources
Gigahertz Peaked Spectrum (GPS) sources and Compact Symmetric Objects (CSO) are selected in very different ways, but have a significant overlap in properties. Ever since their discovery it has been speculated that they are young objects, but only recently, strong evidence has been provided indicating that GPS sources and CSOs are indeed the young counterparts of large, extended sources. They ar...
متن کاملGiant radio sources
We present multi-frequency VLA observations of two giant quasars, 0437−244 and 1025−229, from the Molonglo Complete Sample. These sources have well-defined FRII radio structure, possible one-sided jets, no significant depolarization between 1365 and 4935 MHz and low rotation measure (| RM | < 20 rad m −2). The giant sources are defined to be those whose overall projected size is ≥ 1 Mpc. We hav...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1982
ISSN: 0074-1809
DOI: 10.1017/s0074180900028023