New X-shaped bulge photometric model as a tool for measuring B/PS bulges and their X-structures in photometric studies

Author:

Smirnov Anton A12,Savchenko Sergey S13

Affiliation:

1. St. Petersburg State University, Universitetskij pr. 28, 198504 St Petersburg, Stary Peterhof, Russia

2. Central (Pulkovo) Astronomical Observatory of RAS, Pulkovskoye Chaussee 65/1, 196140 St Petersburg, Russia

3. Special Astrophysical Observatory, Nizhniy Arkhyz, 369167 Karachai-Cherkessia, Russia

Abstract

ABSTRACT Recent orbital studies of 3D bar structure in various numerical and analytical models show that X-structures that reside in boxy/peanut-shaped (B/PS) bulges are not delineated by some specific type of orbits, but are natural parts of them and formed by the same orbits that constitute such bulges. This implies that to accurately account for B/PS bulges and their X-structures in photometric studies, one needs the photometric model of B/PS bulge that includes an X-structure as its natural part. To find such a model, we considered a self-consistent numerical galaxy model where a typical B/PS bulge arises. Using spectral characteristics of particle-‘stars’, we decomposed the galaxy model on to the bar and non-bar components. We used the extracted 3D bar component to find an appropriate B/PS bulge photometric model, which can account for X-structures residing in such bulges. The resulted B/PS bulge photometric model has a truncated 2D Sersic profile with truncations introduced above (in the upper half-plane) and below (in the bottom half-plane) the rays of X-structures. We applied this model to represent B/PS bulges of various numerical models and some real galaxies. The comparison with previous works revealed that there are systematic shifts between the X-structure parameters of the same galaxies measured within the different approaches. We found that the geometric parameters of X-structures of real and modelled galaxies are consistent with each other if we measure them using our new model.

Funder

Russian Foundation for Basic Research

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 7 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Deprojection and stellar dynamical modelling of boxy/peanut bars in edge-on discs;Monthly Notices of the Royal Astronomical Society;2024-03-19

2. Galaxies decomposition with spiral arms – II. A multiwavelength case study of M 51;Monthly Notices of the Royal Astronomical Society;2024-01-11

3. Globular clusters and bar: captured or not captured?;Monthly Notices of the Royal Astronomical Society;2024-01-05

4. Galaxies decomposition with spiral arms – I: 29 galaxies from S4G;Monthly Notices of the Royal Astronomical Society;2023-12-13

5. The problem of dust attenuation in photometric decomposition of edge-on galaxies and possible solutions;Monthly Notices of the Royal Astronomical Society;2023-07-22

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