Crab Nebula (M1)
|Minimum credit line: Image courtesy of NRAO/AUI
(for details, see .|
The Crab Nebula (M1) is the remnant of the earliest known supernova explosion,
recorded by Chinese astronomers in AD
1054. A novel technique developed by radio astronomers during the design of
a proposed new telescope has allowed
them to make a radio image of the Crab Nebula with much improved accuracy.
This technique, Homogeneous
Mosaicing, has been developed as part of the design effort leading to
NRAO's proposal of the Millimeter Array. This is
a method for expanding the field of view of the interferometric telescopes
beyond the limit imposed by the small field
of view of the array elements: data from an interferometric array are
combined with low resolution, total power data
acquired with the same antennas (as the VLA is not equipped for total
power, those data were obtained using a VLBA
antenna of the same size.) A joint deconvolution provides information on
all spatial scales ranging from the full high
resolution of the array up to many times the field of view of a single
This image was made using the NRAO Very Large Array and one element of the
NRAO Very Long Baseline Array
used as a single dish. The total flux is 498 Jy, 40% higher than the
previous best VLA image. This result directly
affects spectral index studies of the Crab Nebula, which are crucial to
understanding the physical processes that
determine its shape and evolution.
Investigator(s): J.M. Uson, T.J. Cornwell
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Type of Observation
Center of Image
RA: 05:34:31.97, Dec: 22:00:52.10 (B1950)
Field of View
0.3333 x 0.3333 degrees
VLA Config. - D using 27 antennas.
- Astronomical database entries for m1
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