TY - JOUR

T1 - First direct identification of the barlens vertical structure in galaxy models

AU - Tikhonenko, Iliya S.

AU - Smirnov, Anton A.

AU - Sotnikova, Natalia Ya

N1 - Publisher Copyright: © ESO 2021.

PY - 2021/4/16

Y1 - 2021/4/16

N2 - Applying spectral dynamics methods to one typical N-body model with a barlens, we dissect the modelled bar into separate components supported by completely different types of orbits. We identify at least four components: a narrow elongated bar, a boxy bar, and two components contributing to the barlens. We analyse the vertical structure of all components that make up the thick part of the bar, which has a boxy/peanut shape (B/P bulge). We show that the 'peanut' shape is mainly due to the orbits that assemble the boxy part of the face-on bar. We associate the X-shape with the narrow and elongated bar. The wider part of the barlens with square-like isophotes contributes to the boxy shape of the B/P bulge when we observe the galaxy edge-on. However, the part of the barlens with rounded isophotes in the face-on view is a rather flat structure in the vertical direction without any significant off-centre protrusions. Thus, for the first time, we demonstrate that the rounded face-on barlens cannot be entirely associated with the B/P bulge.

AB - Applying spectral dynamics methods to one typical N-body model with a barlens, we dissect the modelled bar into separate components supported by completely different types of orbits. We identify at least four components: a narrow elongated bar, a boxy bar, and two components contributing to the barlens. We analyse the vertical structure of all components that make up the thick part of the bar, which has a boxy/peanut shape (B/P bulge). We show that the 'peanut' shape is mainly due to the orbits that assemble the boxy part of the face-on bar. We associate the X-shape with the narrow and elongated bar. The wider part of the barlens with square-like isophotes contributes to the boxy shape of the B/P bulge when we observe the galaxy edge-on. However, the part of the barlens with rounded isophotes in the face-on view is a rather flat structure in the vertical direction without any significant off-centre protrusions. Thus, for the first time, we demonstrate that the rounded face-on barlens cannot be entirely associated with the B/P bulge.

KW - Galaxies: bulges

KW - Galaxies: kinematics and dynamics

KW - Galaxies: structure

KW - galaxies: structure

KW - galaxies: kinematics and dynamics

KW - galaxies: bulges

UR - http://www.scopus.com/inward/record.url?scp=85104297562&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/202140703

DO - 10.1051/0004-6361/202140703

M3 - Article

AN - SCOPUS:85104297562

VL - 648

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

M1 - L4

ER -