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Δευτέρα 17 Οκτωβρίου 2016

The Sculptor Galaxy (NGC 253)

Φωτογραφία: The Sculptor Galaxy (NGC 253)

Here we have a beautiful collaboration, an image combining data by +Dylan O'Donnell and +john mills. Dylan contributed LRGB data taken from his own observatory in Byron Bay, Australia, using a Celestron 9.25″ Edge HD telescope, a QHY12 CCD and a QHY9 (mono) CCD and John contributed Ha data from Sydney using a William Optics 110T and an Atik One Mono with Astronomik Ha filter.

You can see the Sculptor Galaxy (NGC 253, Caldwell 65). It is an intermediate spiral galaxy (Hubble-Type Sc, https://goo.gl/xdxA9i) located in the constellation of Sculptor (https://goo.gl/5lyF8J), about 11.4 million light-years away from Earth. It is part of the Sculptor Group (https://goo.gl/vXu8VL) of galaxies, one of the closest groups of galaxies to our Milky Way.

We see the galaxy almost edge-on, its spiral structure is slightly disturbed, most likely by gravitational interactions (https://goo.gl/ipKZIe) with its satellite galaxy (https://goo.gl/N7C8ES) NGC 253-dw2, a dwarf galaxy (https://goo.gl/S4pJVZ).

NGC 253 is undergoing a period of intense star formation (https://goo.gl/Mn2Zxf), it is a starburst galaxy (https://goo.gl/Smc8G0). You can see countless HII regions (ionized interstellar atomic hydrogen, https://goo.gl/glgWjw) as reddish spots in this image. They are emission nebulae in which the strong ultraviolet light of young and hot stars is ionizing the gas.

Research suggests that located in the center of NGC 253 is a supermassive black hole (https://goo.gl/eQNC6O), with a mass estimated to be 5 million times that of our Sun.

The Sculptor Galaxy was discovered on September 23rd, 1783, by the German astronomer Caroline Herschel (https://goo.gl/cTT7e0).

Read more on the Sculptor Galaxy here:
https://en.wikipedia.org/wiki/Sculptor_Galaxy
http://www.eso.org/public/images/eso1025a/
http://hubblesite.org/newscenter/archive/releases/1998/42/image/a/

Read more on the image and equipment used here in Dylan's post:
http://deography.com/sculptor-galaxy-up-close/

What is an emission nebula?

An emission nebula is a cloud of ionized gas (often by ultraviolet radiation from nearby stars) emitting light of various colors, in case of HII mostly reddish-pink (when viewed in natural colors). More information here:
https://en.wikipedia.org/wiki/Emission_nebula
https://en.wikipedia.org/wiki/H_II_region

More on intermediate spiral galaxies:
https://en.wikipedia.org/wiki/Intermediate_spiral_galaxy
https://en.wikipedia.org/wiki/Spiral_galaxy

More on the different types of galaxies:
https://en.wikipedia.org/wiki/Galaxy_morphological_classification

Global Star Party

+Dylan O'Donnell is one of the many talented astronomers participating in the Global Star Party (+Global Star Party Live). The Global Star Party is a weekly hangout with talk about astronomy and live views of objects in space. Should you be interested in astronomy take a look here:
YouTube: http://www.youtube.com/GlobalStarPartyLive
Twitter: https://twitter.com/globalstarparty
Flickr: https://www.flickr.com/groups/globalstarparty/

Image credit: The Sculptor Galaxy (NGC 253) +Dylan O'Donnell, +john mills https://goo.gl/ZY6YXw

If you like this photograph then you can find more of Dylan's work here at: http://deography.com/

More of John's images can be found here:
https://www.flickr.com/photos/infernocolony
https://www.instagram.com/photosinferno/

Thank you for your interest in this Astronomy/Astrophysics collection. Maybe add me on Google+ (+Pierre Markuse) and Twitter (https://twitter.com/Pierre_Markuse) or have a look at the Space/Space Technology collection here: https://goo.gl/5KP0wx

#science #astronomy #astrophotography #sculptorgalaxy #ngc253 #spiralgalaxy #supermassiveblackhole #space #silvercoingalaxy
Here we have a beautiful collaboration, an image combining data by +Dylan O'Donnell and +john mills. Dylan contributed LRGB data taken from his own observatory in Byron Bay, Australia, using aCelestron 9.25″ Edge HD telescope, a QHY12 CCDand a QHY9 (mono) CCD and John contributed Ha data from Sydney using a William Optics 110T and an Atik One Mono with Astronomik Ha filter.

You can see the Sculptor Galaxy (NGC 253, Caldwell 65). It is an intermediate spiral galaxy(Hubble-Type Schttps://goo.gl/xdxA9i) located in the constellation of Sculptor (https://goo.gl/5lyF8J), about 11.4 million light-years away from Earth. It is part of the Sculptor Group (https://goo.gl/vXu8VL) of galaxies, one of the closest groups of galaxies to our Milky Way.

We see the galaxy almost edge-on, its spiral structure is slightly disturbed, most likely bygravitational interactions (https://goo.gl/ipKZIe) with its satellite galaxy (https://goo.gl/N7C8ESNGC 253-dw2, a dwarf galaxy (https://goo.gl/S4pJVZ).

NGC 253 is undergoing a period of intense star formation (https://goo.gl/Mn2Zxf), it is a starburst galaxy (https://goo.gl/Smc8G0). You can see countless HII regions (ionized interstellar atomic hydrogenhttps://goo.gl/glgWjw) as reddish spots in this image. They are emission nebulae in which the strong ultraviolet light of young and hot stars is ionizing the gas.

Research suggests that located in the center of NGC 253 is a supermassive black hole(https://goo.gl/eQNC6O), with a mass estimated to be 5 million times that of our Sun.

The Sculptor Galaxy was discovered on September 23rd, 1783, by the German astronomer Caroline Herschel (https://goo.gl/cTT7e0).

Read more on the Sculptor Galaxy here:
https://en.wikipedia.org/wiki/Sculptor_Galaxy
http://www.eso.org/public/images/eso1025a/
http://hubblesite.org/newscenter/archive/releases/1998/42/image/a/

Read more on the image and equipment used here in Dylan's post:
http://deography.com/sculptor-galaxy-up-close/

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