pastorello-theyoungnuclear-2016.pdf (1.19 MB)
The young nuclear stellar disc in the SB0 galaxy NGC 1023
journal contribution
posted on 2016-04-01, 00:00 authored by E M Corsini, L Morelli, Nicola PastorelloNicola Pastorello, E Dalla Bontá, A Pizzella, E PortaluriSmall kinematically decoupled stellar discs with scalelengths of a few tens of parsec are known to reside in the centre of galaxies. Different mechanisms have been proposed to explain how they form, including gas dissipation and merging of globular clusters. Using archival Hubble
Space Telescope imaging and ground-based integral-field spectroscopy, we investigated the structure and stellar populations of the nuclear stellar disc hosted in the interacting SB0 galaxy NGC 1023. The stars of the nuclear disc are remarkably younger and more metal rich with
respect to the host bulge. These findings support a scenario in which the nuclear disc is the end result of star formation in metal enriched gas piled up in the galaxy centre. The gas can be of either internal or external origin, i.e. from either the main disc of NGC 1023 or the nearby satellite galaxy NGC 1023A. The dissipationless formation of the nuclear disc from already formed stars, through the migration and accretion of star clusters into the galactic centre, is rejected.
Space Telescope imaging and ground-based integral-field spectroscopy, we investigated the structure and stellar populations of the nuclear stellar disc hosted in the interacting SB0 galaxy NGC 1023. The stars of the nuclear disc are remarkably younger and more metal rich with
respect to the host bulge. These findings support a scenario in which the nuclear disc is the end result of star formation in metal enriched gas piled up in the galaxy centre. The gas can be of either internal or external origin, i.e. from either the main disc of NGC 1023 or the nearby satellite galaxy NGC 1023A. The dissipationless formation of the nuclear disc from already formed stars, through the migration and accretion of star clusters into the galactic centre, is rejected.
History
Journal
Monthly notices of the royal astronomical societyVolume
457Issue
2Pagination
1198 - 1207Publisher
Oxford University PressLocation
Oxford, Eng.Publisher DOI
ISSN
0035-8711eISSN
1365-2966Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2016, The AuthorsUsage metrics
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