TY - JOUR

T1 - The haloes and environments of nearby galaxies (HERON) – II. The outer structure of edge-on galaxies

AU - Мосенков, Александр Владимирович

AU - Rich, R Michael

AU - Koch, Andreas

AU - Brosch, Noah

AU - Thilker, David

AU - Román, Javier

AU - Müller, Oliver

AU - Смирнов, Антон Александрович

AU - Усачев, Павел Александрович

PY - 2020/5

Y1 - 2020/5

N2 - The haloes and environments of nearby galaxies (HERON) project is aimed at studying haloes and low surface brightness (I,SB) details near galaxies. In this second HERON paper, we consider in detail deep imaging (down to surface brightness of similar to 28 mag arcsec(-2) in the r band) for 35 galaxies, viewed edge-on. We confirm a range of LSB features previously described in the literature but also report new ones. We classify the observed outer shapes of the galaxies into three main types (and their prototypes): disc/diamond-like (NGC 891), oval (NGC 4302), and boxy (NGC 3628). We show that the shape of the outer disc in galaxies does not often follow the general 3D model of an exponential disc: 17 galaxies in our sample exhibit oval or even boxy isophotes at the periphery. Also, we show that the less flattened the outer disc, the more oval or boxy its structure. Many galaxies in our sample have an asymmetric outer structure. We propose that the observed diversity of the galaxy outer shapes is defined by the merger history and its intensity: if no recent multiple minor or single major merging took place, the outer shape is diamond-like or discy. On the contrary, interacting galaxies show oval outer shapes, whereas recent merging appears to transform the outer shape to boxy.

AB - The haloes and environments of nearby galaxies (HERON) project is aimed at studying haloes and low surface brightness (I,SB) details near galaxies. In this second HERON paper, we consider in detail deep imaging (down to surface brightness of similar to 28 mag arcsec(-2) in the r band) for 35 galaxies, viewed edge-on. We confirm a range of LSB features previously described in the literature but also report new ones. We classify the observed outer shapes of the galaxies into three main types (and their prototypes): disc/diamond-like (NGC 891), oval (NGC 4302), and boxy (NGC 3628). We show that the shape of the outer disc in galaxies does not often follow the general 3D model of an exponential disc: 17 galaxies in our sample exhibit oval or even boxy isophotes at the periphery. Also, we show that the less flattened the outer disc, the more oval or boxy its structure. Many galaxies in our sample have an asymmetric outer structure. We propose that the observed diversity of the galaxy outer shapes is defined by the merger history and its intensity: if no recent multiple minor or single major merging took place, the outer shape is diamond-like or discy. On the contrary, interacting galaxies show oval outer shapes, whereas recent merging appears to transform the outer shape to boxy.

KW - 3-DIMENSIONAL DISTRIBUTION

KW - CCD SURFACE PHOTOMETRY

KW - COSMOLOGICAL SIMULATIONS

KW - DISK GALAXIES

KW - ELLIPTIC GALAXIES

KW - H I

KW - PEANUT-SHAPED BULGES

KW - PSEUDOBULGE HIDDEN

KW - SPIRAL GALAXIES

KW - STELLAR HALOES

KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: haloes

KW - galaxies: interactions

KW - galaxies: photometry

KW - galaxies: structure

KW - Galaxies: evolution

KW - Halos

KW - Photometry -structure

KW - Interactions

KW - Formation

UR - https://www.mendeley.com/catalogue/faa8136d-26ee-3709-88e4-257abd643f67/

U2 - 10.1093/mnras/staa678

DO - 10.1093/mnras/staa678

M3 - Article

VL - 494

SP - 1751

EP - 1768

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -