Supernova 1993J and its Fourier Transform
Supernova 1993J as seen with Very Long Baseline Interferometry. This image is made from observations using a world-wide array of 18 radio telescopes, including the NRAO Very Long Baseline Array, Very Large Array, Green Bank Telescope and antennas of the European VLBI Network and the NASA Deep Space Network. The whitish-yellow, glowing object is a radio-image of SN 1993J at a frequency of 8.4 GHz. The ring-shaped "mountains" on the ground represent the actual measurements made by the radio interferometer from which the radio-image was made. Mathematically speaking the radio-image is the Fourier transform of the measurements. Supernova 1993J exploded in 1993 in the galaxy M81, approximately 12 million light years away. The spherical shell of gas is expanding with a speed of about 5000 miles/sec. This spherical shell produces the ring-like structure seen in the radio image. The diameter is about one-half of a light year.
The VLBI Image was made by combining global Array observations made on three sessions between 1998 Dec. to 200 Nov. (PI N. Bartel; see Bietenholz, Bartel & Rupen, ApJ, 597, 2003 for details; see also Bartel et al, 2000, Science, 287, 112; Bietenholz, Bartel, & Rupen, 2001, ApJ, 557, 770; Bartel et al, 2002, 581, 404). The resolution is 0.7 milli-arcsecs. The "ground" shows the Fourier transform of the image, or the uv-plane.
Legacy Astronomical Images
NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.
Legacy Astronomical Image
Michael Bietenholz, York University
N. Bartel, M. Bietenholz, M. Rupen
Very Long Baseline Array (VLBA)
Type of Observation
Center of Image
RA 9:55:24.775, Dec: 69:1:13.704 (J2000)
Field of View
0.000002 x 0.000002 degrees
Contact the archivist for a high resolution tif of this image.
Galactic Sources Series
Legacy Astronomical Images, “Supernova 1993J and its Fourier Transform,” NRAO Archives, accessed August 12, 2022, https://www.nrao.edu/archives/items/show/33527.