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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/23228
Title: Old age and supersolar metallicity in a massive z ∼ 1.4 early-type galaxy from VLT/X-Shooter spectroscopy
Authors: Lonoce, I.
LONGHETTI, Marcella 
Maraston, C.
Thomas, D.
Mancini, C.
Cimatti, A.
Ciocca, F.
Citro, A.
Daddi, E.
di Serego Alighieri, S.
GARGIULO, ADRIANA 
Maiolino, R.
MANNUCCI, FILIPPO 
Moresco, M.
POZZETTI, Lucia 
Quai, S.
SARACCO, Paolo 
Issue Date: 2015
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 454
Issue: 4
First Page: 3912
Abstract: We present the first estimate of age, stellar metallicity and chemical abundance ratios, for an individual early-type galaxy at high-redshift (z = 1.426) in the COSMOS (Cosmological Evolution Survey) field. Our analysis is based on observations obtained with the X-Shooter instrument at the Very Large Telescope (VLT), which cover the visual and near-infrared spectrum at high (R > 5000) spectral resolution. We measure the values of several spectral absorptions tracing chemical species, in particular magnesium and iron, besides determining the age-sensitive D4000 break. We compare the measured indices to stellar population models, finding good agreement. We find that our target is an old (t > 3 Gyr), high-metallicity ([Z/H] > 0.5) galaxy which formed its stars at z<SUB>form</SUB> >5 within a short time-scale ∼0.1 Gyr, as testified by the strong [α/Fe] ratio (>0.4), and has passively evolved in the first >3-4 Gyr of its life. We have verified that this result is robust against the choice and number of fitted spectral features, and stellar population model. The result of an old age and high-metallicity has important implications for galaxy formation and evolution confirming an early and rapid formation of the most massive galaxies in the Universe.
Acknowledgments: We are grateful to the anonymous referee for helpful comments on our manuscript. We kindly thank Francesco La Barbera for his precious help in the data reduction and Kyle Westfall for helpful discussions. IL acknowledges the institute of Cosmology and Gravitation of the University of Portsmouth for a brilliant research visit during which a larger part of this project was worked out. IL, ML, AG and PS acknowledge the support from grant Prin-INAF 2012-2013 1.05.09.01.05. AC, LP, MM acknowledge the support from grant PRIN MIUR 2010-2011. CM and DT acknowledge The Science, Technology and Facilities Council for support through the Survey Cosmology and Astrophysics consolidated grant, ST/I001204/1.
URI: http://hdl.handle.net/20.500.12386/23228
URL: https://academic.oup.com/mnras/article/454/4/3912/994242
http://arxiv.org/abs/1509.04000v1
ISSN: 0035-8711
DOI: 10.1093/mnras/stv2150
Bibcode ADS: 2015MNRAS.454.3912L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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