December 4, 2021

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They found a possible galaxy, the third largest local group - science - life

They found a possible galaxy, the third largest local group – science – life

A Spanish investigation led by the Andalusian Institute of Astrophysics (IAA-CSIC) has discovered a possible satellite galaxy of M33, the third largest in the Local Group after Andromeda and the Milky Way, in a project discussing their training models.

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cosmic model lambda materia The cold darkness, which explains the origin and evolution of the universe, presupposes that observations of some galaxies in the Local Group, such as neighboring M33, should show many satellites, although only one has been discovered so far.

An investigation by the Institute of Astrophysics in Andalusia (south) has found a candidate for an M33 satellite, which could be the starting point for new observations.

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With between thirty and forty billion stars, the spiral galaxy M33 (or Triangle galaxy) is the third largest local galaxy, to which the Milky Way belongs and is gravitationally bound to Andromeda, the largest in the group.

M33 is an obvious exponent of the so-called “missing satellite” problem, with simulations estimating that it should contain between nine and 25 satellite galaxies, but only one has been found so far.

Explained Talentia Senior IAA-CSIC researcher who leads the work, David Martínez-Delgado.

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The new galaxy, called Pisces VII, was discovered by amateur astronomer Giuseppe Donatello in public data from the DESI Legacy survey, and to confirm this, the scientific team used deeper data obtained with a 3.5-meter telescope, which allowed them to measure its distance and absolute size.

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The analysis suggested that it could be a satellite of M33, but the estimation of the distance is very complex and there would be another possibility because if it is far away, it could be the most isolated dwarf galaxy discovered so far.

“We plan to confirm whether the motion of this new galaxy is consistent with the motion of a dwarf galaxy in the Local Group, for which we need spectroscopic observations using an eight- or ten-meter telescope, such as the Great Telescope of the Spanish Archipelago of the Canary Islands or Keck,” added the researcher from the University of Surrey involved in Discovery, Michelle Collins.

This result indicates that there may be more undiscovered satellites.

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