TY - JOUR

T1 - Polar-ring galaxies in the Illustris TNG50 simulation

AU - Смирнов, Даниил Владимирович

AU - Мосенков, Александр Владимирович

AU - Решетников, Владимир Петрович

PY - 2024

Y1 - 2024

N2 - Polar-ring galaxies (PRGs) are an outstanding example of galaxies with misaligned kinematics where a typically red central galaxy is surrounded by a large-scale ring or disk of stars, gas and dust oriented almost perpendicular to the main body. It is believed that polar structures are formed in a secondary event after the assembly of a central galaxy, but due to their scarcity, their formation paths are not well constrained yet. We present a study of PRGs from TNG50 cosmological simulations, focusing on the origin of their polar structures. Based on the synthetic images and baryonic mass distribution, we found 6 galaxies with stellar polar rings. Using Supplementary Data Catalogues and available particle data, we confirm that the selected galaxies are direct analogs of real PRGs. In our sample, the polar structures are a result of the close interaction between the host galaxy and its companion. We track two formation paths for the stellar polar rings in our sample: (i) star formation in the accreted gas, (ii) tidal disruption of the satellite’s stellar component. Rings formed during the first scenario are, on average, bluer and younger than ones formed due to the satellite disruption. We report a steady increase of the ring’s inclination around the two most massive galaxies across a few billion years with a rate of ≈8○/Gyr. The formation of a polar structure in some cases can increase the nuclear activity of the central galaxy and/or turn the active nucleus off completely.

AB - Polar-ring galaxies (PRGs) are an outstanding example of galaxies with misaligned kinematics where a typically red central galaxy is surrounded by a large-scale ring or disk of stars, gas and dust oriented almost perpendicular to the main body. It is believed that polar structures are formed in a secondary event after the assembly of a central galaxy, but due to their scarcity, their formation paths are not well constrained yet. We present a study of PRGs from TNG50 cosmological simulations, focusing on the origin of their polar structures. Based on the synthetic images and baryonic mass distribution, we found 6 galaxies with stellar polar rings. Using Supplementary Data Catalogues and available particle data, we confirm that the selected galaxies are direct analogs of real PRGs. In our sample, the polar structures are a result of the close interaction between the host galaxy and its companion. We track two formation paths for the stellar polar rings in our sample: (i) star formation in the accreted gas, (ii) tidal disruption of the satellite’s stellar component. Rings formed during the first scenario are, on average, bluer and younger than ones formed due to the satellite disruption. We report a steady increase of the ring’s inclination around the two most massive galaxies across a few billion years with a rate of ≈8○/Gyr. The formation of a polar structure in some cases can increase the nuclear activity of the central galaxy and/or turn the active nucleus off completely.

UR - https://www.mendeley.com/catalogue/b7d1a07c-3333-3314-b55b-4df6d70abc42/

U2 - 10.1093/mnras/stad3368

DO - 10.1093/mnras/stad3368

M3 - Article

VL - 527

SP - 4112

EP - 4128

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -