M81 with satellite galaxy Holmberg IX in the top center-right corner The other, NGC 3077, is located off the top edge of this image. M82 is one of two galaxies strongly influenced gravitationally by M81. In late February 2022, astronomers reported that M81 may be the source of FRB 20200120E, a repeating fast radio burst. It is estimated M81 has 210 ± 30 globular clusters. The general explanation is that the hot, short-lived blue stars that are found within star formation regions are very effective at heating the dust and thus enhancing the infrared dust emission from these regions. This interstellar dust is found primarily within the galaxy's spiral arms, and it has been shown to be associated with star formation regions. Most of the emission at infrared wavelengths originates from interstellar dust. The red colors represent 24 μm emission originating from heated dust in the interstellar medium. The green colors represent 8 μm emission originating primarily from polycyclic aromatic hydrocarbons in the interstellar medium. The blue colors represent stellar emission observed at 3.6 μm. An infrared image of Messier 81 taken by the Spitzer Space Telescope. Telescopes with apertures of 8 inches (20 cm) or larger are needed to distinguish structures in the galaxy. The two objects are generally not observable to the unaided eye, although highly experienced amateur astronomers may be able to see Messier 81 under exceptional observing conditions with a very dark sky. Messier 81 and Messier 82 are considered ideal for viewing using binoculars and small telescopes. Its apparent magnitude due to its distance means it requires a good night sky and only rises very briefly and extremely low at its southernmost limit from Earth's surface, about the 20th parallel south. The galaxy is to be found approximately 10° northwest of Alpha Ursae Majoris (Dubhe) along with several other galaxies in the Messier 81 Group. In 1779, Pierre Méchain and Charles Messier reidentified Bode's object, hence listed it in the Messier Catalogue. Thus, it is sometimes referred to as "Bode's Galaxy". Messier 81 was first discovered by Johann Elert Bode on 31 December 1774. The galaxy's large size and relatively high brightness also makes it a popular target for amateur astronomers. Because of its relative proximity to the Milky Way galaxy, large size, and active galactic nucleus (which harbors a 70 million M ☉ supermassive black hole), Messier 81 has been studied extensively by professional astronomers. It has a D 25 isophotal diameter of 29.44 kiloparsecs (96,000 light-years). Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major. (diameter 25.0 mag/arcsec 2 B-band isophote) The HST's view of M81, with its open star clusters, globular star clusters, and regions of fluorescent gas.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |