M81 and its group: New images

[M81 composite, CXO/HST/SST/GALEX]

This composite NASA image of the spiral galaxy M81, located about 12 million light years away, includes X-ray data from the Chandra X-ray Observatory (blue), optical data from the Hubble Space Telescope (green), infrared data from the Spitzer Space Telescope (pink) and ultraviolet data from GALEX (purple). The inset shows a close-up of the Chandra image. The object at the center of M81 is considered to be a supermassive black hole that is about 70 million times more massive than the Sun.

Credit: X-ray: NASA/CXC/Wisconsin/D.Pooley & CfA/A.Zezas; Optical: NASA/ESA/CfA/A.Zezas; UV: NASA/JPL-Caltech/CfA/J.Huchra et al.; IR: NASA/JPL-Caltech/CfA

Chandra Press Release, June 18, 2008:

[M81 group, HST]

Nasa’s Hubble Space Telescope, as well as GALEX, were used to obtain deep images from the M81 group, and imaged a number of faint blue blobs, actually large young star clusters. These are aligned along bridges of matter between the galaxies M81, M82 and NGC 3077, and nicknamed Arp’s Loop.

Credit: NASA, ESA, and D. de Mello (Catholic University of America/GSFC)

STScI Press Release, January 8, 2008:

[M81 group, VLA]

Radio astronomers using the NRAO’s Very Large Array (VLA) of radi antennae have found a number of faint, hitherto unknown hydrogen clouds
in the M81 group.

NRAO Press Release, January 10, 2008:

SEDS M81 page:


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