Jenna M. Nugent, Xinyu Dai, Ming Sun,
... center observations of two poor galaxy groups, NGC 3402 and NGC 5129, with temperatures below 1 keV. Through spectral ... the critical density of the universe for NGC 3402 and NGC 5129, respectively. These quantities are consistent with extrapolations ... f b = 0.095 ± 0.014 for NGC 3402 and NGC 5129, respectively. Combining other poor groups with well- ...
Tópico(s): Astrophysical Phenomena and Observations
2020 - IOP Publishing | The Astrophysical Journal
Richard R. Lane, R. Salinas, T. Richtler,
Previous studies have shown that the kinematics of the field elliptical galaxy NGC 7507 do not necessarily require dark matter. This is troubling because, in the context of LCDM cosmologies, all galaxies should have a large dark matter component. We use penalised pixel fitting software to extract velocities and velocity dispersions from GMOS slit mask spectra. Using Jeans and MONDian modelling we produce best fit models to the velocity dispersion. We find that NGC 7507 has a two component stellar ...
Tópico(s): Astronomy and Astrophysical Research
2014 - EDP Sciences | Astronomy and Astrophysics
F. Hoyle, N. C. Wickramasinghe,
... of extragalactic dust is to be seen in NGC 4594 (the Sombrero Hat, Fig. 10.1) where ... indicating the presence of aligned grains. The galaxy NGC 891 shown in Fig. 10.3a is interesting ...
Tópico(s): Astrophysics and Star Formation Studies
1991 - Springer Nature (Netherlands) | Astrophysics and space science library