Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10332804" target="_blank" >RIV/00216208:11320/16:10332804 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985815:_____/16:00463952 RIV/00216224:14310/16:00093056

Výsledek na webu

<a href="http://dx.doi.org/10.1051/0004-6361/201526608" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201526608</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201526608" target="_blank" >10.1051/0004-6361/201526608</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam

Popis výsledku v původním jazyce

Context. The elliptical galaxy NGC3923 is known to be surrounded by a number of stellar shells, probable remnants of an accreted galaxy. Despite its uniqueness, the deepest images of its outskirts come from the 1980s. On the basis of the modified Newtonian dynamics (MOND), it has recently been predicted that a new shell lies in this region. Aims. We obtain the deepest image ever of the galaxy, map the tidal features in it, and search for the predicted shell. Methods. The image of the galaxy was taken by the MegaCam camera at the Canada-France-Hawaii Telescope in the g'-band. It reached the surface-brightness limit of 29 mag arcsec(-2). In addition, we reanalyzed an archival HST image of the galaxy. Results. We detected up to 42 shells in NGC3923. This is by far the highest number among all shell galaxies. We present the description of the shells and other tidal features in the galaxy. A probable progenitor of some of these features was discovered. The shell system likely originates from two or more progenitors. The predicted shell was not detected, but the new image revealed that the prediction was based on incorrect assumptions and poor data.

Název v anglickém jazyce

Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam

Popis výsledku anglicky

Context. The elliptical galaxy NGC3923 is known to be surrounded by a number of stellar shells, probable remnants of an accreted galaxy. Despite its uniqueness, the deepest images of its outskirts come from the 1980s. On the basis of the modified Newtonian dynamics (MOND), it has recently been predicted that a new shell lies in this region. Aims. We obtain the deepest image ever of the galaxy, map the tidal features in it, and search for the predicted shell. Methods. The image of the galaxy was taken by the MegaCam camera at the Canada-France-Hawaii Telescope in the g'-band. It reached the surface-brightness limit of 29 mag arcsec(-2). In addition, we reanalyzed an archival HST image of the galaxy. Results. We detected up to 42 shells in NGC3923. This is by far the highest number among all shell galaxies. We present the description of the shells and other tidal features in the galaxy. A probable progenitor of some of these features was discovered. The shell system likely originates from two or more progenitors. The predicted shell was not detected, but the new image revealed that the prediction was based on incorrect assumptions and poor data.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy and Astrophysics [online]

ISSN

1432-0746

e-ISSN

—

Svazek periodika

588

Číslo periodika v rámci svazku

duben

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

000373207800089

EID výsledku v databázi Scopus

2-s2.0-84962339147