W44 is one of the best example of an interacting supernova remnant with its parent molecular cloud. Radio continuum measurements indicate an elongated shell-like structure with a remarkable network of filaments and arcs across the face of this remnant (Giacani et al.1977). Recent near-IR, molecular hydrogen and 4.5 micron images using {Spitzer Space Observatory} show similar filamentary structure suggesting the presence of shocked
molecular gas along the synchrotron-emitting radio filaments (Reach et al. 2006). X-ray observations show diffuse emission from the central region of this remnant (Rho et al. 1994).
References:
Reach, W. T., Rho, J. et al. 2006, AJ, 131, 1479
Rho, J., Petre, R., Schlegel, E. M., Hester, J. 1994, ApJ, 430, 757
Giacani, E. B., Dubner, G. M. et al. 1997, AJ, 113, 1379
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Telescope
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VLA
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Type of Observation
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Continuum Observations
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Center of Image
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RA: 18:56:2.00, Dec: 01:21:57.00 (J2000)
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Field of View
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0.7500 x 0.6667 degrees
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Technical Caption
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A radio image in red color is constructed by the "author" from archival 20cm data by combining data from observations taken in the C and D-array configurations. The original radio image is published by Giacani et al. (1997).
An X-ray image in blue color is based on ROSAT observations (Rho et al. 1994)
An Infrared image in green color based on SPITZER observations (Reach et al. 2006) shows the distribution of molecular gas as the remnant interacts with its parent cloud.
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- Astronomical database entries for W44
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