Holmberg II [SEP] constellation
Holmberg II
Holmberg II is a dwarf galaxy in the constellation Ursa Major. Its apparent magnitude is 11,1 and it is 11 million light years away from Earth. The galaxy is dominated by huge glowing gas bubbles, which are regions of star formation.
Holmberg II also hosts an ultraluminous X-ray source. One hypothesis suggests that is caused by an intermediate mass black hole that is pulling surrounding material.
Holmberg II was discovered by Erik Bertil Holmberg.
Holmberg 15A
Holmberg 15A is a supergiant elliptical galaxy and the central dominant galaxy of the Abell 85 galaxy cluster in the constellation Cetus, about 700 million light-years from Earth. It was discovered c. 1937 by Erik Holmberg. It briefly shot to fame when it was reported to have the largest core ever observed in a galaxy, spanning some 15,000 light years, however this was subsequently refuted.
Supermassive black hole.
It has been alleged that the primary component of the galactic core is a supermassive black hole with