Cool, new views of Andromeda galaxy

Jan 29, 2013 by Whitney Clavin
The ring-like swirls of dust filling the Andromeda galaxy stand out colorfully in this new image from the Herschel Space Observatory, a European Space Agency mission with important NASA participation. Credit: ESA/NASA/JPL-Caltech/NHSC

(Phys.org)—Two new eye-catching views from the Herschel space observatory are fit for a princess. They show the elegant spiral galaxy Andromeda, named after the mythical Greek princess known for her beauty.

The , also known as Messier 31, lies 2 million light-years away, and is the closest large galaxy to our own Milky Way. It is estimated to have up to one trillion stars, whereas the Milky Way contains hundreds of billions. Recent evidence suggests Andromeda's overall mass may in fact be less than the mass of the Milky Way, when dark matter is included.

Herschel, a mission with important NASA contributions, sees the longer-wavelength infrared light from the galaxy, revealing its rings of cool dust. Some of this dust is the very coldest in the galaxy—only a few tens of degrees above absolute zero.

In this new view of the Andromeda galaxy from the Herschel space observatory, cool lanes of forming stars are revealed in the finest detail yet. Herschel is a European Space Agency mission with important NASA participation. Credit: ESA/Herschel/PACS & SPIRE Consortium, O. Krause, HSC, H. Linz

In both views, warmer dust is highlighted in the central regions by different colors. New stars are being born in this central, crowded hub, and throughout the galaxy's rings in dusty knots. Spokes of dust can also be seen between the rings.

One view, seen at www.jpl.nasa.gov/spaceimages/d… ails.php?id=PIA16682 , is a mosaic of data from Herschel's Photodetecting Array Camera and Spectrometer (PACS) and spectral and photometric imaging receiver (SPIRE).

The second view, seen at www.jpl.nasa.gov/spaceimages/d… ails.php?id=PIA16681 , shows data from only the SPIRE instrument, which captures the longest of wavelengths detectable by Herschel.

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User comments : 3

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megmaltese
1 / 5 (4) Jan 30, 2013
That blue at the center is the mess the central immense black hole does while eating stars... incredible image.
yash17
1 / 5 (7) Jan 30, 2013
"The Andromeda galaxy, also known as Messier 31, lies 2 million light-years away, and is the closest large galaxy to our own Milky Way. It is estimated to have up to one trillion stars, whereas the Milky Way contains hundreds of billions. Recent evidence suggests Andromeda's overall mass may in fact be less than the mass of the Milky Way, when dark matter is included."

"Cloud & rain model" really likes this cosmological datum, as "Car model" expects galaxies mass density in cosmos isn't homogeneous. Likewise, their size isn't homogeneous. See this;
"http://phys.org/n...se.html"

When galaxies get extremely dense, wherever they are, they will fleet back to Universe nucleus (located around behind Ursa Major & Leo constellation).

What about elusive dark energy? Dark energy isn't elusive with "Car model." There are two kinds of energy at cosmos; cosmic pressure of dark matter & gravity of Universe nucleus. That's all.
antialias_physorg
4.2 / 5 (5) Jan 30, 2013
That blue at the center is the mess the central immense black hole does while eating stars

Not quite. The central part you see in blue is simply very active star formation because dust concentration there is highest.
The black hole and its accretion disc are much too small to see on this image.

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