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The nebula is associated with the galaxy overdensity BOSS1441, [7] which is a protocluster at z=2.3. The nebula represents the circumgalactic medium. Its emission is powered by starburst and an obscured AGN. One of the most extended ELAN discovered as of 2019. [8] NGC 262 Halo Cloud 1,300,000 ly (400,000 pc) [9] H I region
RCW 36 (also designated Gum 20) [5] is an emission nebula containing an open cluster in the constellation Vela.This H II region is part of a larger-scale star-forming complex known as the Vela Molecular Ridge (VMR), a collection of molecular clouds in the Milky Way that contain multiple sites of ongoing star-formation activity. [1]
The Crab Nebula is a pulsar wind nebula associated with the 1054 supernova.It is located about 6,500 light-years from the Earth. [1]A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth (roughly less than 10 to 300 parsecs (pc) [30 to 1000 light-years] away [2]) to have noticeable effects on Earth's biosphere.
The most famous Lyman-alpha blobs were discovered in 2000 by Steidel et al. [1] Matsuda et al., using the Subaru Telescope of the National Astronomical Observatory of Japan extended the search for LABs [2] and found over 30 new LABs in the original field of Steidel et al., [1] although they were all smaller than the originals. These LABs form a ...
Sagittarius B2 (Sgr B2) is a giant molecular cloud of gas and dust that is located about 120 parsecs (390 ly) from the center of the Milky Way.This complex is the largest molecular cloud in the vicinity of the core and one of the largest in the galaxy, spanning a region about 45 parsecs (150 ly) across. [2]
NGC 6826 (also known as Caldwell 15) is a planetary nebula located in the constellation Cygnus.It is commonly referred to as the "Blinking Planetary", although many other nebulae exhibit such "blinking".
Theoretical models predict that planetary nebulae can form from main-sequence stars of between 8 and 1 solar masses, which puts their age at 40 million years and older. Although there are a few hundred known open clusters within that age range, a variety of reasons limit the chances of finding a member of an open cluster in a planetary nebula ...
The X-ray continuum can arise from bremsstrahlung, either magnetic or ordinary Coulomb, black-body radiation, synchrotron radiation, inverse Compton scattering of lower-energy photons by relativistic electrons, knock-on collisions of fast protons with atomic electrons, and atomic recombination, with or without additional electron transitions. [1]