The single-pulse characteristics of the millisecond pulsar PSR B1937]21 are studied using the recently installed Caltech baseband recorder at the Arecibo Radio Observatory in Puerto Rico. This is the Ðrst such analysis of this object that includes both average intensity pulses as well as ““ giant pulses.ÏÏ Pulse ensemble-averaging techniques are developed in order to study the characteristics o...

We present radio maps of the head-tail radio galaxy, 3C 129 at 240 and 610 MHz using the Giant Metrewave Radio Telescope. We have studied in detail the morphology of the source and the distribution of spectral index over the object. We find large-scale spectral steepening along the jet away from the core. Using synchrotron spectral ageing theory, we infer the age (time since particle accelerati...

4C+37.11, at z=0.055 shows two compact radio nuclei, imaged by VLBI at 7mas separation, making it the closest known resolved super-massive black hole binary (SMBHB). An important question is whether this unique object is young, caught on the way to a gravitational in-spiral and merger, or has ‘stalled’ at 7pc. We describe new radio/optical/X-ray observations of the massive host and its surround...

BIMA observations of the Orion nebula discovered a giant flare from a young star previously undetected at millimeter wavelengths. The star briefly became the brightest compact object in the nebula at 86 GHz. Its flux density increased by more than a factor of 5 on a timescale of hours, to a peak of 160 mJy. This is one of the most luminous stellar radio flares ever observed. Remarkably, the Cha...

We report on ESO–VLT adaptive optics imaging of one radio-loud quasar at z ∼ 3. In spite of the large distance of the object we are able to detect its surrounding extended nebulosity the properties of which are consistent with an underlying massive galaxy of MK ∼ –27 and effective radius Re = 7 kpc. As far as we know this is the clearest detection of a radio loud quasar host at high redshift. T...

RFID stands for Radio Frequency Identification which provides the ability to identify, locate and sense conditions of animate inanimate entities. frequency identification or is a generic term technologies that are used auto people object using radio waves. In this technology unique serial number stored identify person an other related information, on microchip silicon attached antenna in turn r...

We present details of a new sample of radio-loud quasars drawn from 0.013 sr of the 7C Redshift Survey. This sample is small (21 quasars) but complete in that every object with an unresolved nucleus and/or broad emission lines with S151MHz > 0.5 Jy has been discovered. The dependence of the quasar fraction with redshift and radio luminosity is investigated, providing new evidence supporting the...

One important application field for wireless sensor networks (WSN) is object localization, thus various realizations yet exist. Here we are just interested in RSSI based localization systems. In particular, we focus on analyzing diverse system parameters, like radio base frequency, transmitting power, or modulation format, to improve the expressiveness of RSSI values. Hence, we built a real-wor...

The few known γ-ray binary systems are all associated with variable radio and Xray emission. The TeV source HESS J0632+057, apparently associated with the Be star MWC148, is plausibly a new member of this class. Following the identification of a variable X-ray counterpart to the TeV source we conducted GMRT and VLA observations in June-September 2008 to search for the radio counterpart of this ...

With the goal of identifying high redshift radio galaxies with FRI classification, here are presented high resolution, wide–field radio observations, near infra–red and optical imaging and multi–object spectroscopy of two fields of the Leiden–Berkeley Deep Survey. These fields, Hercules.1 and Lynx.2, contain a complete sample of 81 radio sources with S1.4GHz > 0.5 mJy within 0.6 square degrees....