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Boomerang Nebula May 27, 2012

Posted by brunomarshall in protoplanetary nebula.
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The Boomerang Nebula also called the Bow Tie Nebula and PGC 3074547, is a protoplanetary nebula,  in the constellation Centaurus, is the coldest known region in the Universe. [1][2]

Is located 5,000 light-years away from Earth, and is coldest place in the Universe found so far. With a temperature of -272 degrees Celsius, it is only 1 degree warmer than absolute zero (the lowest limit for all temperatures). [1][2]

The Boomerang Nebula in Polarized Light

Credit:

[1]-Stellarium

[2]-http://en.wikipedia.org/wiki/Boomerang_Nebula

[3]-http://www.wolaver.org/Space/boomerang-polarized.htm

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Barnard’s Loop May 27, 2012

Posted by brunomarshall in Emission Nebula.
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Barnard’s Loop called also Sh 2-276, is an Emission Nebula in the constellation of Orion. [2]

Orion is one of my favourite constellations, even without telescope with just a binoculars you can enjoy this vast beautiful Nebula. [2]

This wide-angle shot of the sky includes Orion and several neighboring constellations.[2][1]

Barnard’s Loop takes the form of a large arc centred approximately on the Orion Nebula. The stars within the Orion Nebula are believed to be responsible for ionizing the loop. [2][3]

It is estimated to lie at a distance of approximately 1600 light years. [2]

Credit:

[1]-Stellarium

[2]-http://en.wikipedia.org/wiki/Barnard’s_Loop

[3]-http://eastexastronomy.blogspot.de/2010/08/orion.html

Ant Nebula May 27, 2012

Posted by brunomarshall in Bipolar planetary nebula.
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Ant Nebula, called also Mz 3 (Menzel 3), ESO 225-9 is a young bipolar planetary nebula in the constellation Norma.[2]

The Ant Nebula is 8,000 light years away from Earth and it has a magnitude of 13.8 [2]

The Ant Nebula is composed of a bright core and four distinct high-velocity outflows (lobes). [2]

The Ant Nebula is radially expanding at a rate of about 50 km/s, and has no trace of molecular hydrogen emission. [2]

We can see a flat disc of silicates in the centre of the nebula. [3]

Credit:

[1]-Stellarium

[2]-http://en.wikipedia.org/wiki/Mz_3

[3]-http://www.stfc.ac.uk/News+and+Events/4823.aspx

Andromeda Galaxy May 26, 2012

Posted by brunomarshall in Spiral Galaxy.
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The Andromeda Galaxy also known as Messier 31, M31, or NGC 224  is a spiral galaxy approximately 2.6 million light-years (2.5×1019 km) from Earth[1] in the Andromeda constellation, that´s where comes its name from. On a moonless night, the Andromeda Galaxy is visible with the naked eye.[1][2]

The Andromeda Galaxy is the nearest spiral galaxy to our galaxy (Milky Way), but not the closest galaxy overall.[1]

 

 

The Andromeda Galaxy is the largest galaxy of the Local Group, which also contains our galaxy (Milky Way), the Triangulum Galaxy, and about 30 other smaller galaxies, contains one trillion (1012) stars:[1]at least twice the number of stars in our own galaxy, which is estimated to be 200–400 billion.[1]

If we remove the stars from the Milky way (below)[3]

References

[1]-http://en.wikipedia.org/wiki/Andromeda_Galaxy

[2]-http://spacefreighters.blogspot.de/2012/03/andromeda-trillion-stars-coming-at-you.html

[3]-http://www.newforestobservatory.com/2007/11/08/more-m31-andromeda-galaxy-pictures/

[4]-stellarium

Ambartsumian’s Knot May 26, 2012

Posted by brunomarshall in Dwarf Elliptical.
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Ambartsumian’s Knot is a dwarf elliptical galaxy in the constellation Ursa Major. It is the small blue dot off the bottom of the eliptical NGC3561A.[2]

The entire system is called Arp 105, or “The Guitar”, because of its overall shape. “The Guitar” as an example of new galaxies being formed as ejections from older galaxies.[4][1]

Ambartsumian’s Knot is located at the end of what appears to be a bridge of matter extending from the elliptical galaxy NGC 3561B (R.A. 11h 11m, Dec. +28° 42′). The latter is interacting with the nearby spiral galaxy NGC 3651A giving rise to a number of tidal tails and tidal dwarf galaxies. [2][3][4]

 The enormously long tidal tail visible to the left (north) of NGC 3651A in the accompanying photo, Arp 105N, stretches out for 100,000 parsecs (325,000 light-years) from the parent galaxy.[2]



Arp 150 lies close to the center of the rich cluster Abell 1185, which lies about 400 million light-years away. [2]

 Credit:

[1]- Stellarium

[2]-http://www.daviddarling.info/encyclopedia/A/Ambartsumians_Knot.html

[3]- Canada-France-Hawaii Telescope

[4]-http://www.beskeen.com/gallery/galaxy/abell1185/abell1185.shtml