Anne’s Image of the Day: Spiral Galaxy NGC 4157
March 22, 2014
NGC 4157, a barred spiral galaxy in Ursa Major
Image Credit & Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
(http://skycenter.arizona.edu/gallery/galaxies/ngc4157)
NGC 4157 (also known as UGC 7183) is a barred spiral galaxy of some 105,000 light-years across (about the same size as our Milky Way galaxy), located about 35.6 million light-years away from Earth in the northern constellation of Ursa Major (the Great Bear), while it is receding from us at approximately 774 kilometers per second. It is part of the Ursa Major North Group of galaxies.
This galaxy is seen almost edge-on and quite elongated, but it is tilted just enough to see some of the core detail with several dark dust lanes. It has a very low surface brightness and is the faintest of three neighboring galaxies in Ursa Major, including NGC 4026 and NGC 4088.
Three supernova explosions occurred in this galaxy: SN 1937A, SN 1955A and SN 2003J which was a Type II supernova.
A Type II supernova results from the rapid collapse and violent explosion of a massive star. A star must have at least 8 times, and no more than 40–50 times the mass of the Sun for this type of explosion. It is distinguished from other types of supernova by the presence of hydrogen in its spectrum. The exploding star can become billions of times as bright as the Sun before gradually fading from view. At its maximum brightness, the exploded star may outshine an entire galaxy.
Supernova explosions are enriching the intergalactic gas with heavy chemical elements like oxygen, iron and silicon, necessary to build new generations of stars and planets, and to create life.
This image was taken in March and April, 2012 with a SBIG STX16803 CCD Camera at the 32-inch Schulman Telescope (RCOS) on the Mount Lemmon SkyCenter, using Mount Lemmon SkyCenter filters.
Source: http://annesastronomynews.com/annes-image-of-the-day-spiral-galaxy-ngc-4157/
Anyone can join.
Anyone can contribute.
Anyone can become informed about their world.
"United We Stand" Click Here To Create Your Personal Citizen Journalist Account Today, Be Sure To Invite Your Friends.
Please Help Support BeforeitsNews by trying our Natural Health Products below!
Order by Phone at 888-809-8385 or online at https://mitocopper.com M - F 9am to 5pm EST
Order by Phone at 866-388-7003 or online at https://www.herbanomic.com M - F 9am to 5pm EST
Order by Phone at 866-388-7003 or online at https://www.herbanomics.com M - F 9am to 5pm EST
Humic & Fulvic Trace Minerals Complex - Nature's most important supplement! Vivid Dreams again!
HNEX HydroNano EXtracellular Water - Improve immune system health and reduce inflammation.
Ultimate Clinical Potency Curcumin - Natural pain relief, reduce inflammation and so much more.
MitoCopper - Bioavailable Copper destroys pathogens and gives you more energy. (See Blood Video)
Oxy Powder - Natural Colon Cleanser! Cleans out toxic buildup with oxygen!
Nascent Iodine - Promotes detoxification, mental focus and thyroid health.
Smart Meter Cover - Reduces Smart Meter radiation by 96%! (See Video).