Atomic Hydrogen in M81 |
 | Minimum credit line: Image courtesy of NRAO/AUI
(for details, see .
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The galaxy M81 is a spiral galaxy about 11 million light-years
from Earth. It is about 50,000 light-years across. In the optical
(not shown), the galaxy is known as a "Grand Design" spiral, for its
pair of symmetric, well-defined spiral arms. This image, which
only shows the cold atomic hydrogen gas in the galaxy, clearly
shows that the gas also follows this grand design pattern.
In this pseudocolor image, red indicates higher gas densities and
blue weaker emission. Investigator(s): D. S. Adler, D. J. Westpfahl This image is available in the following downloadable versions:
- 395 x 432
- 822 x 900
- 2191 x 2400
If you would like to obtain a higher resolution version of this image,
please contact .
- Read the
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- For unfamiliar terms, visit the NRAO
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Telescope
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VLA
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Date of Observation
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1992-08-01
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Type of Observation
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Spectral Line Observations
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Wavelength
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21 cm
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Frequency
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1420.4 MHz
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Species
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HI
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Center of Image
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RA: 09:55:33.17, Dec: 69:03:55.10
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Field of View
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0.6500 x 0.6500 degrees
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Technical Caption
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The observations consist of data taken
with the VLA in the B-array, C-array and D-array
configurations for a total of more than 60 hours of
observing time. Two pointings and two velocity
settings were used. The resolution is 12".
The continuum sources have
not been removed from the map.
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