NGC1052-DF2

Database links to NGC1052-DF2

Galaxy
NGC1052-DF2

Hubble image of the galaxy

AladinLite

Constellation

whale

Position
equinox : J2000.0 , epoch : J2000.0

Right ascension

02 ^h 41 ^m 46.5 ^sSIMBAD query

declination

−08 ° 24 ′ 08 ″ SIMBAD query

Appearance

Angular expansion

1.2 ′ × 1.12 ′

Physical data

history

Catalog names

NGC1052-DF2 or only briefly DF2 is an ultra diffuse galaxy . It belongs to the NGC1052 group , which is about 20 million parsecs from the Milky Way center. The mass of the galaxy is 2 × 10 ⁸ solar masses .

In 2018 it was discovered that globular clusters rotate extremely slowly in the galaxy and thus cause a speed dispersion of less than 10.5 km / s. With the discovery of a similar galaxy, NGC1052-DF4 , researchers are fairly certain that these two galaxies do not have dark matter .

A more recent study, on the other hand, after analyzing all available data about the galaxy, comes to the conclusion that at around 13 Mpc it is significantly closer to the Milky Way than previously assumed. The assumed absence of dark matter would then disappear and the galaxy would appear like an ordinary Low Surface Brightness Galaxy .

Individual evidence

↑ Jan Hattenbach: Dispute over galaxies without dark matter. Is a galaxy without dark matter the proof of the existence of dark matter? Or is it a triumph for a theory that can do without it? May 14, 2019, accessed May 15, 2019 .
↑ Pieter van Dokkum, Shany Danieli, Yotam Cohen, Allison Merritt, Aaron J. Romanowsky, Roberto Abraham, Jean Brodie, Charlie Conroy, Deborah Lokhorst, Lamiya Mowla, Ewan O'Sullivan, Jielai Zhang: A galaxy lacking dark matter . In: Nature . tape 555 , no. 629 , 2018, doi : 10.1038 / nature25767 , arxiv : 1803.10237 .
↑ Ignacio Trujillo, Michael A Beasley, Alejandro Borlaff, Eleazar R Carrasco, Arianna Di Cintio: A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter . In: Monthly Notices of the Royal Astronomical Society . tape 486 , no. 1 , June 11, 2019, ISSN 0035-8711 , p. 1192-1219 , doi : 10.1093 / mnras / stz771 .

[spek-1] Jan Hattenbach: Dispute over galaxies without dark matter. Is a galaxy without dark matter the proof of the existence of dark matter? Or is it a triumph for a theory that can do without it? May 14, 2019, accessed May 15, 2019 .

[Dok18-2] Pieter van Dokkum, Shany Danieli, Yotam Cohen, Allison Merritt, Aaron J. Romanowsky, Roberto Abraham, Jean Brodie, Charlie Conroy, Deborah Lokhorst, Lamiya Mowla, Ewan O'Sullivan, Jielai Zhang: A galaxy lacking dark matter . In: Nature . tape 555 , no. 629 , 2018, doi : 10.1038 / nature25767 , arxiv : 1803.10237 .

[3] Ignacio Trujillo, Michael A Beasley, Alejandro Borlaff, Eleazar R Carrasco, Arianna Di Cintio: A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter . In: Monthly Notices of the Royal Astronomical Society . tape 486 , no. 1 , June 11, 2019, ISSN 0035-8711 , p. 1192-1219 , doi : 10.1093 / mnras / stz771 .