An H II region or HII region is a region of interstellar atomic hydrogen that is ionized. It is typically in a molecular cloud of partially ionized gas...
35 KB (4,404 words) - 16:45, 13 October 2024
H II region. Near an expanding H II region is a dense HI region, separated from the undisturbed HI region by a shock front and from the H II region by...
4 KB (474 words) - 03:49, 16 May 2024
Barba, Rodolfo (2004). "An in-depth analysis of a prototypical giant H II region: NGC 604". HST Proposal ID #10419: 10419. Bibcode:2004hst..prop10419B...
28 KB (1,713 words) - 14:10, 6 October 2024
region of ionized hydrogen surrounding the massive stars is known as an H II region while the shells of neutral hydrogen surrounding the H II region are...
21 KB (2,865 words) - 03:53, 30 September 2024
within the southern region of the dense dust cloud known as Lynds 1630, along the edge of the much larger, active star-forming H II region called IC 434. The...
9 KB (852 words) - 17:48, 19 September 2024
cloud, its hydrogen can be neutral, making an H I region; ionized, or plasma making it an H II region; or molecular, which are referred to simply as...
7 KB (800 words) - 16:55, 26 September 2024
illumination of IC 434. This H II region is one of the youngest to form around members of the Orion OB1 association of hot stars. The region has a radius of about...
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Cone Nebula (category H II regions)
is an H II region in the constellation of Monoceros. It was discovered by William Herschel on December 26, 1785, at which time he designated it H V.27...
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NGC 595 (category H II regions)
NGC 595 is an H II region in the Triangulum Galaxy. It was discovered by Heinrich Ludwig d'Arrest on October 1, 1864. "NGC 595". SIMBAD. Centre de données...
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Sh 2-185 (category H II regions)
Sh 2-185 is an H II region centered on the massive star system Gamma Cassiopeiae (γ Cas) in the northern constellation of Cassiopeia. It was included...
16 KB (1,395 words) - 17:57, 5 September 2024
Messier 43 (category H II regions)
Mairan's Nebula and NGC 1982, is a star-forming nebula with a prominent H II region in the equatorial constellation of Orion. It was discovered by the French...
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Tarantula Nebula (category H II regions)
The Tarantula Nebula (also known as 30 Doradus) is a large H II region in the Large Magellanic Cloud (LMC), forming its south-east corner (from Earth's...
14 KB (1,290 words) - 16:55, 22 June 2024
Lagoon Nebula (category H II regions)
constellation Sagittarius. It is classified as an emission nebula and has an H II region. The Lagoon Nebula was discovered by Giovanni Hodierna before 1654 and...
6 KB (575 words) - 00:59, 19 August 2024
Rosette Nebula (category H II regions)
(also known as Caldwell 49) is an H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open...
8 KB (780 words) - 19:14, 28 September 2024
Bubble Nebula (category H II regions)
also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. It lies close to the...
5 KB (373 words) - 02:56, 8 October 2024
Orion Nebula (category H II regions)
The current astronomical model for the nebula consists of an ionized (H II) region, roughly centered on Theta1 Orionis C, which lies on the side of an elongated...
45 KB (4,810 words) - 20:25, 23 September 2024
Westerhout 49-2 (W49-2) is a very massive and luminous star in the H II region Westerhout 49. At a mass of 250 solar masses (although with significant...
4 KB (419 words) - 13:56, 9 October 2024
Trifid Nebula (category H II regions)
Messier 20 or M20 and as NGC 6514) is an H II region in the north-west of Sagittarius in a star-forming region in the Milky Way's Scutum–Centaurus Arm...
8 KB (775 words) - 01:29, 27 July 2024
NGC 604 (category H II regions)
604 is an H II region inside the Triangulum Galaxy. It was discovered by William Herschel on September 11, 1784. It is among the largest H II regions in...
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the large molecular cloud Sh2-310, a large, quite local star-forming H II region—its diameter: 480 arcminutes (′) or 681 ly (209 pc). The radius of VY...
67 KB (6,931 words) - 15:47, 10 September 2024
That is, it shows properties of a LINER-type galaxy intermixed with an H II region around the nucleus. Messier 98 is a member of the Virgo Cluster, which...
10 KB (746 words) - 11:07, 18 July 2024
H V-17. Herschel also cataloged the Triangulum Galaxy's brightest and largest H II region (diffuse emission nebula containing ionized hydrogen) as H III...
48 KB (5,095 words) - 00:55, 26 September 2024
Omega Nebula (category H II regions)
The Omega Nebula is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued...
12 KB (1,332 words) - 01:54, 17 September 2024
light-years in diameter, making it one of the largest known H II regions. This H II region represents striking similarity with NGC 604 in M33, both in...
10 KB (1,068 words) - 15:29, 22 September 2024
nebula in Large Magellanic Cloud. DEM L294 is a H II region in Large Magellanic Cloud. DEM S80 is a H II region in Small Magellanic Cloud. GKK-A144 is a stellar...
165 KB (8,900 words) - 01:53, 21 September 2024
Pelican Nebula (category H II regions)
The Pelican Nebula (also known as IC 5070) is an H II region associated with the North America Nebula in the constellation Cygnus. The gaseous contortions...
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NGC 7380 (category H II regions)
the surrounding H II region, and are driving out the surrounding gas and dust while triggering star formation in the neighboring region. Of the variable...
5 KB (446 words) - 08:14, 23 August 2024
Eagle Nebula (category H II regions)
Nebula is part of a diffuse emission nebula, or H II region, which is catalogued as IC 4703. This region of active current star formation is about 5700...
13 KB (1,260 words) - 23:52, 22 August 2024
NGC 281 (category H II regions)
NGC 281, IC 11 or Sh2-184 is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky...
6 KB (503 words) - 14:40, 11 June 2024