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The volume density of giant low surface brightness galaxiesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Saburova Anna S., Chilingarian Igor V., Kulier Andrea, Galaz Gaspar, Grishin Kirill A., Kasparova Anastasia V., Toptun Victoria, Katkov Ivan Yu
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 520
- Номер: 1
- Год издания: 2023
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: L85
- Последняя страница: L90
- DOI: 10.1093/mnrasl/slad005
- Аннотация: Rare giant low surface brightness galaxies (gLSBGs) act as a stress test for the current galaxy formation paradigm. To answer the question 'How rare are they?', we estimate their volume density in the local Universe. A visual inspection of 120 deg2 covered by deep Subaru Hyper Suprime-Cam data was performed independently by four team members. We detected 42 giant disky systems (30 of them isolated) at z ≤ 0.1 with either g-band 27.7 mag arcsec-2 isophotal radius or four disc scale lengths 4h ≥ 50 kpc, 37 of which (including 25 isolated) had low central surface brightness (μ0,g ≥ 22.7 mag arcsec-2). This corresponds to volume densities of 4.70 × 10-5 Mpc-3 for all galaxies with giant extended discs and 4.04 × 10-5 Mpc-3 for gLSBGs, which converts to ~12 700 such galaxies in the entire sky out to z < 0.1. These estimates agree well with the result of the Evolution and Assembly of GaLaxies and their Environments (EAGLE) cosmological hydrodynamical simulation. Giant disky galaxies represent the large-sized end of the volume density distribution of normal-sized spirals, suggesting the non-exceptional nature of giant discs. We observe a high active galactic nucleus fraction among the newly found gLSBGs.
- Добавил в систему: Сабурова Анна Станиславовна