Archive for the ‘M31’ Category

M31 and M101: GALEX images

July 24, 2008

[M31 in UV, GALEX] [M101 in UV, GALEX]

Nasa’s GALEX UV telescope satellite has imaged two famous spiral galaxies, the Andromeda Galaxy M31 and the Pinwheel Galaxy M101. These images are in false color, 2-color composite: far-UV displayed in blue, near-UV in red.

GALEX Feature Story (February 21, 2008):
M31 image:
M101 image:

SEDS M31 page:
SEDS M101 page:


Recent Images and News of Messier Objects

July 15, 2008

M4 (and NGC 6397) from Chandra; April 28, 2008:

M31 and M101 by Galex, February 21, 2008:

M81 from Chandra; June 18, 2008:

M81 group (in particular, Arp’s Loop), from Hubble; January 8, 2008:

M81 group with radio clouds, from NRAO; January 10, 2008:

M82 in X-rays by XMM Newton:

M83 by Galex; April 16, 2008:

M106 by Galex; April 28, 2008:

Various THINGS galaxies, including M51, M63, M74, M81 and several M81 group dwarfs, by NRAO; January 10, 2008:

M31: XMM and Chandra investigate central region

May 23, 2007

[Chandra X-ray Image of Andromeda Galaxy (M31)]

Central part of M31 in X-rays

[Combined X-ray and optical image of M31]

M31 central part, combined X-ray and optical image

Credit: NASA/CXC/MPE/W.Pietsch

In X-rays, hot gas is seen to envelop the central part of the Andromeda Galaxy, M31. The prominent point sources mostly belong to interacting double stars, many of them containing a White Dwarf companion pulling away matter from its partner star. When the matter gets compressed and heated, a thermonuclear explosion occurs near the White Dwarfs surface; this explosion is bright in X-rays and makes the star flash up as a nova.

Chandra Press Release (May 22, 2007):

ESA XMM Newton Press Release (May 9, 2007):


SEDS M31 page:

M31/M32: Another Spitzer image of the Andromeda Galaxy and its companion

October 24, 2006

[Spitzer image of M31/M32]

Spitzer image of M31/M32
Investigating Spitzer images of M31, astronomers found evidence for a heavy collision of the Andromeda Galaxy M31 with its small elliptical companion M32, about 210 million years ago.

Spitzer Press Release:

M31: Spitzer images the Andromeda Galaxy

October 9, 2006

[M31 by Spitzer and Galex]

M31 by Spitzer

This image is a false color composite comprised of data from Galaxy Evolution Explorer’s far-ultraviolet detector (blue), near-ultraviolet detector (green), and Spitzer’s multiband imaging photometer at 24 microns (red).

[M31 by Spitzer]

M31 by Spitzer – gas and dust

Another semi-recent Spitzer image of M31 (June 5, 2006)

M31: New radio map: Cold Gas in M31

July 7, 2006

[CO radio map of M31, MPIfR]

CO radio map of M31, MPIfR

MPIfR Press Release 06/2006 (2), June 29, 2006

A new CO map of the Andromeda galaxy was made by a German-French research team of the Max-Planck-Institut für Radioastronomie (MPIfR) in Bonn and the Institut de Radioastronomie Millimétrique (IRAM) in Grenoble. The map shows the first detailed distribution of cold gas in a neighbouring galaxy, revealing the sites where new stars are born. The motions of this gas were also obtained. With more than 800 hours of telescope time this study is one of the most extensive observational projects in millimeter radio astronomy.

Cool .. :)