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2016 - 2021

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Messier 108 is a barred spiral galaxy in the constellation Ursa Major. From the perspective of the Earth, this galaxy is seen almost edge-on at a distance of 45 million light years. This galaxy is an isolated member of the Ursa Major Cluster of galaxies in the Virgo supercluster. It has a morphological classification of type SBbc in the de Vaucouleurs system, which means it is a barred spiral galaxy with somewhat loosely wound arms. The maximum angular size of the galaxy in the optical band is 11′.1 × 4′.6, and it is inclined 75° to the line of sight. This galaxy has an estimated mass of 125 billion times the mass of the Sun and includes about 290 ± 80 globular clusters. Examination of the distribution of neutral hydrogen in this galaxy shows shells of expanding gas extending for several kiloparsecs, known as H1 supershells. These may be driven by bursts of star formation activity, resulting in supernovae explosions. Alternatively they may result from an infall of gas from outside the galaxy or by radio jets. Observations with the Chandra X-ray Observatory have identified 83 X-ray sources, including a source located at the nucleus. The brightest of these sources may be an intermediate-mass black hole that is accreting matter. The galaxy is also emitting a diffuse soft X-ray radiation within 10 kpc of the optical galaxy. The supermassive black hole at the core has an estimated mass equal to 24 million times the mass of the Sun. Foto i Åva 30/3 2020 med MN190 och Atik. !6 min vardera rgb och 20 min lum. Guidat under ganska blåsiga förhållanden och med visst månsken.

Rolf Johansson