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http://hdl.handle.net/20.500.12386/26250
Titolo: | Towards a census of supercompact massive galaxies in the Kilo Degree Survey | Autori: | TORTORA, CRESCENZO LA BARBERA, Francesco NAPOLITANO, NICOLA ROSARIO Roy, N. RADOVICH, MARIO CAVUOTI, STEFANO BRESCIA, Massimo Longo, G. GETMAN, FEDOR Capaccioli, M. GRADO, ANIELLO Kuijken, K. H. de Jong, J. T. A. McFarland, J. P. PUDDU, Emanuella Anna |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 457 | Fascicolo: | 3 | Da pagina:: | 2845 | Abstract: | The abundance of compact, massive, early-type galaxies (ETGs) provides important constraints to galaxy formation scenarios. Thanks to the area covered, depth, excellent spatial resolution and seeing, the ESO Public optical Kilo Degree Survey (KiDS), carried out with the VLT Survey Telescope, offers a unique opportunity to conduct a complete census of the most compact galaxies in the Universe. This paper presents a first census of such systems from the first 156 deg<SUP>2</SUP> of KiDS. Our analysis relies on g-, r- and I-band effective radii (R<SUB>e</SUB>), derived by fitting galaxy images with point spread function (PSF)-convolved Sérsic models, high-quality photometric redshifts, z<SUB>phot</SUB>, estimated from machine learning techniques, and stellar masses, M<SUB>⋆</SUB>, calculated from KiDS aperture photometry. After massiveness ({M_{⋆}}≳ 8 × 10^{10} M_{☉}) and compactness ({R_e}≲ 1.5 kpc in g, r and I bands) criteria are applied, a visual inspection of the candidates plus near-infrared photometry from VIKING-DR1 are used to refine our sample. The final catalogue, to be spectroscopically confirmed, consists of 92 systems in the redshift range z ∼ 0.2-0.7. This sample, which we expect to increase by a factor of 10 over the total survey area, represents the first attempt to select massive supercompact ETGs (<monospace>MSCGs</monospace>) in KiDS. We investigate the impact of redshift systematics in the selection, finding that this seems to be a major source of contamination in our sample. A preliminary analysis shows that <monospace>MSCGs</monospace> exhibit negative internal colour gradients, consistent with a passive evolution of these systems. We find that the number density of <monospace>MSCGs</monospace> is only mildly consistent with predictions from simulations at z > 0.2, while no such system is found at z < 0.2. | URI: | http://hdl.handle.net/20.500.12386/26250 | URL: | https://academic.oup.com/mnras/article/457/3/2845/2588970 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw184 | Bibcode ADS: | 2016MNRAS.457.2845T | Fulltext: | open |
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