On the contribution of the X-ray source to the extended nebular HeII emission in IZw18

no code implementations • 11 Mar 2021 • C. Kehrig, M. A. Guerrero, J. M. Vilchez, G. Ramos-Larios

Here we present a new study on the effects that X-ray sources have on the HeII ionization in the extremely metal-poor galaxy IZw18 (Z ~ 3 % Zsolar), whose X-ray emission is dominated by a single high-mass X-ray binary (HMXB).

Astrophysics of Galaxies

Two types of distribution of the gas velocity dispersion of MaNGA galaxies

no code implementations • 23 Dec 2020 • L. S. Pilyugin, I. A. Zinchenko, M. A. Lara-Lopez, Y. A. Nefedyev, J. M. Vilchez

We find that there are two types of distribution of the gas velocity dispersion across the images of galaxies: (i) the distributions of 909 galaxies show a radial symmetry with or without the sigma enhancement at the center (R distribution) and (ii) distributions with a band of enhanced sigma along the minor axis in the images of 159 galaxies with or without the sigma enhancement at the center (B distribution) The sigma distribution across the images of 78 galaxies cannot be reliable classified.

Astrophysics of Galaxies