scholarly journals The Canadian Galactic Plane Survey

1998 ◽  
Vol 15 (1) ◽  
pp. 56-59 ◽  
Author(s):  
J. English ◽  
A. R. Taylor ◽  
J. A. Irwin ◽  
S. M. Dougherty ◽  
S. Basu ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Angular Resolution ◽  
Galactic Plane ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Molecular Gas ◽  
The Galaxy ◽  
High Dynamic ◽  
Multi Phase ◽  
Better Than

AbstractThe Dominion Radio Astrophysical Observatory (DRAO) is carrying out a survey as part of an international collaboration to image the northe, at a common resolution, in emission from all major constituents of the interstellar medium; the neutral atomic gas, the molecular gas, the ionised gas, dust and relativistic plasma. For many of these constituents the angular resolution of the images (1 arcmin) will be more than a factor of 10 better than any previous studies. The aim is to produce a publicly-available database of high resolution, high-dynamic range images of the Galaxy for multi-phase studies of the physical states and processes in the interstellar medium. We will sketch the main scientific motivations as well as describe some preliminary results from the Canadian Galactic Plane Survey/Releve Canadien du Plan Galactique (CGPS/RCPG).

scholarly journals Galactic neutral hydrogen and the magnetic ISM foreground

2017 ◽  
Vol 12 (S333) ◽  
pp. 146-150
Author(s):  
S.E. Clark
Keyword(s):  
Interstellar Medium ◽  
Dynamic Range ◽  
Low Frequency ◽  
Neutral Hydrogen ◽  
Depth Resolution ◽  
High Dynamic Range ◽  
Neutral Gas ◽  
High Dynamic ◽  
New Generation ◽  
The Relationship

AbstractThe interstellar medium is suffused with magnetic fields, which inform the shape of structures in the diffuse gas. Recent high-dynamic range observations of Galactic neutral hydrogen, combined with novel data analysis techniques, have revealed a deep link between the morphology of neutral gas and the ambient magnetic field. At the same time, an observational revolution is underway in low-frequency radio polarimetry, driven in part by the need to characterize foregrounds to the cosmological 21-cm signal. A new generation of experiments, capable of high angular and Faraday depth resolution, are revealing complex filamentary structures in diffuse polarization. The relationship between filamentary structures observed in radio-polarimetric data and those observed in atomic hydrogen is not yet well understood. Multiwavelength observations will enable new insights into the magnetic interstellar medium across phases.

Towards a microchannel-based X-ray detector with two-dimensional spatial and time resolution and high dynamic range

2015 ◽  
Vol 22 (5) ◽  
pp. 1202-1206 ◽  
Author(s):  
Bernhard W. Adams ◽  
Anil U. Mane ◽  
Jeffrey W. Elam ◽  
Razib Obaid ◽  
Matthew Wetstein ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Time Resolution ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
High Time Resolution ◽  
Two Dimensional ◽  
X Ray ◽  
High Dynamic ◽  
Time Gating ◽  
Better Than

X-ray detectors that combine two-dimensional spatial resolution with a high time resolution are needed in numerous applications of synchrotron radiation. Most detectors with this combination of capabilities are based on semiconductor technology and are therefore limited in size. Furthermore, the time resolution is often realised through rapid time-gating of the acquisition, followed by a slower readout. Here, a detector technology is realised based on relatively inexpensive microchannel plates that uses GHz waveform sampling for a millimeter-scale spatial resolution and better than 100 ps time resolution. The technology is capable of continuous streaming of time- and location-tagged events at rates greater than 107events per cm2. Time-gating can be used for improved dynamic range.

40 Gb/s TDM SYSTEM TRANSCEIVER PROTOTYPE IN InP HBT TECHNOLOGY

2005 ◽  
Vol 15 (03) ◽  
pp. 643-665
Author(s):  
KARTHIKEYAN KRISHNAMURTHY ◽  
JIAN XU ◽  
XIAOQIANG SHOU ◽  
RAMAKRISHNA VETURY ◽  
SHRINIVASAN JAGANATHAN ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Extinction Ratio ◽  
High Dynamic Range ◽  
Clock And Data Recovery ◽  
Voltage Controlled Oscillator ◽  
Optical Amplification ◽  
Limiting Amplifier ◽  
High Dynamic ◽  
Time Division ◽  
Better Than

A time-division-multiplexing (TDM) system transceiver with 4–channel 10 Gb/s interfaces to achieve 40 Gb/s non-return to zero (NRZ) transmission is presented. The front-end components are implemented in an indium phosphide double hetero-junction bipolar transistor (InP DHBT) technology. They include a 4:1 multiplexer with a voltage controlled oscillator and clock multiplication unit, modulator drivers for electro-absorption and differential lithium-niobate modulators, trans-impedance amplifier, limiting amplifier and 1:4 demultiplexer with clock and data recovery circuit. The transceiver was used to teat optical transmission over a 2.26 km link with a 40 Gb/s, 231-1 pseudo-random bit sequence (PRBS) data. The transmitter achieves better than 12.9 dB extinction ratio, 1 ps added root mean square (RMS) jitter and 4 dBm output power. Without any optical amplification the receiver achieves -9.1 dBm back to back sensitivity at a bit error rate (BER) of 10-12 and a high dynamic range of 12.5 dBm.

scholarly journals Space VLBI

2001 ◽  
Vol 205 ◽  
pp. 422-427
Author(s):  
H. Hirabayashi
Keyword(s):  
International Collaboration ◽  
Angular Resolution ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
High Angular Resolution ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
High Dynamic

Space VLBI enables high angular resolution and high dynamic range imaging through an extension of ground-based VLBI. The TDRSS space VLBI experiments in the 1980s were followed by the first space VLBI imaging mission, VSOP, in the 1990s. The new century holds the promise of the VSOP-2 and ARISE missions, which aim for more sensitive, higher angular resolution and higher observing frequency capabilities. These missions will enable AGNs to be viewed much more clearly and will make broader science areas, including lower brightness sources, accessible. It is noted that in all space VLBI missions, international collaboration in global sense plays an important role.

scholarly journals The Second Epoch Molonglo Galactic Plane Survey: Images and Candidate Supernova Remnants

2014 ◽  
Vol 31 ◽  
Author(s):  
A. J. Green ◽  
S. N. Reeves ◽  
T. Murphy
Keyword(s):  
Interstellar Medium ◽  
Supernova Remnants ◽  
Large Scale ◽  
Supernova Remnant ◽  
Angular Resolution ◽  
Galactic Plane ◽  
Postage Stamps ◽  
The Galaxy ◽  
Complete Survey ◽  
Extended Sources

AbstractThe second epoch Molonglo Galactic Plane Survey covers the area 245° ⩽l⩽ 365° and |b| ⩽ 10° at a frequency of 843 MHz and an angular resolution of 45 arcsec × 45 arcsec cosec(δ). The sensitivity varies between 1–2 mJy beam− 1depending on the presence of strong extended sources. This survey is currently the highest resolution and most sensitive large-scale continuum survey of the southern Galactic plane. In this paper, we present the images of the complete survey, including postage stamps of some new supernova remnant (SNR) candidates and a discussion of the highly structured features detected in the interstellar medium. The intersection of these two types of features is discussed in the context of the ‘missing’ SNR population in the Galaxy.

High-dynamic-range interferometric bragg-cell spectrum analyser

1986 ◽  
Vol 133 (1) ◽  
pp. 26
Author(s):  
J. Mellis ◽  
G.R. Adams ◽  
K.D. Ward
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Spectrum Analyser ◽  
High Dynamic
Sign in / Sign up

Export Citation Format

Share Document