Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam
| Autor: | Bruno Jungwiert, Jc. Cuillandre, Lucie Jílková, Michal Bílek, S. D. J. Gwyn, Kateřina Bartošková, Ivana Ebrová |
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| Přispěvatelé: | Astronomical Institute of the Czech Academy of Sciences (ASU / CAS), Czech Academy of Sciences [Prague] (CAS), Charles University [Prague] (CU), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Canadian Astronomy Data Centre, Leiden Observatory [Leiden], Universiteit Leiden |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
010504 meteorology & atmospheric sciences
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Astrophysics::High Energy Astrophysical Phenomena Shell (structure) FOS: Physical sciences techniques: image processing Context (language use) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences cD law.invention Gravitation Telescope law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics galaxies: elliptical and lenticular 010303 astronomy & astrophysics galaxies: individual: NGC 3923 Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics galaxies: peculiar Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Modified Newtonian dynamics galaxies: photometry gravitation Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Elliptical galaxy |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2016, 588, pp.A77. ⟨10.1051/0004-6361/201526608⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201526608⟩ |
| Popis: | Context. The elliptical galaxy NGC 3923 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/arcsec2. In addition, we reanalyzed an archival HST image of the galaxy. Results. We detected up to 42 shells in NGC 3923. 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. 14 pages, 2 tables, 19 figures, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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