SHARDS: survey for high-Z absorption red & dead sources



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Pérez González, Pablo Guillermo and Cava, A. (2013) SHARDS: survey for high-Z absorption red & dead sources. In Fourth science meeting with the GTC. Universidad nacional autónoma Mexico, Instituto Astronomía, pp. 55-57. ISBN 978-607-02-4281-6

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SHARDS, an ESO/GTC Large Program, is an ultra-deep (26.5 mag) spectro-photometric survey with GTC/OSIRIS designed to select and study massive passively evolving galaxies at z=1.0-2.3 in the GOODS-N field using a set of 24 medium-band filters (FWHM ∼ 17 nm) covering the 500-950 nm spectral range. Our observing strategy has been planned to detect, for z>1 sources, the prominent Mg absorption feature (at rest-frame ∼ 280 nm), a distinctive, necessary, and sufficient feature of evolved stellar populations (older than 0.5 Gyr). These observations are being used to: (1) derive for the first time an unbiased sample of high-z quiescent galaxies, which extends to fainter magnitudes the samples selected with color techniques and spectroscopic surveys; (2) derive accurate ages and stellar masses based on robust measurements of spectral features such as the Mg_UV or D(4000) indices; (3) measure their redshift with an accuracy Δz/(1+z)<0.02; and (4) study emission-line galaxies (starbursts and AGN) up to very high redshifts. The well-sampled optical SEDs provided by SHARDS for all sources in the GOODS-N field are a valuable complement for current and future surveys carried out with other telescopes (e.g., Spitzer, HST, and Herschel).

Resumen (otros idiomas)

SHARDS (siglas en inglés de la Exploración de galaxias con absorción rojas y muertas a alto desplazamiento al rojo), un ESO/GTC Large Program, es una exploración espectro-fotométrica super-profunda (26.5 mag) realizada con GTC/OSIRIS y diseñada para seleccionar y estudiar galaxias masivas que evolucionan pasivamente a z=1.0–2.3 usando un juego de 24 filtros de anchura media (FWHM∼17 nm) a 500–950 nm y apuntando a GOODS-N. Nuestra estrategia observacional ha sido ideada para detectar la marca espectral conocida como absorción de Mg (a ∼280 nm), que constituye una característica distintiva, necesaria y suficiente de las poblaciones estelares evolucionadas (más viejas que 0.5 Gyr). Nuestras observaciones están siendo analizadas para: (1) construir por primera vez una muestra no sesgada de galaxias quiescentes a alto - z, llegando a magnitudes más débiles de lo conseguido hasta ahora con técnicas espectroscópicas y fotométricas; (2) derivar edades y masas estelares precisas basándonos en medidas robustas de úndices espectrales como el de Mg_UV o D(4000); (3) estimar desplazamientos al rojo con una precisión de ∆ z/(1+ z )

Item Type:Book Section
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© 2013 Instituto de Astronomía, UNAM.
Science with the GTC Meeting (4º. 2011. Santa Cruz La Palma, España).

Uncontrolled Keywords:Massive galaxies; Keck spectroscopy; Elliptic galaxies; Size evolution; Field galaxies; Black-holes; Sequence; Universe; History
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:38438
Deposited On:19 Jul 2016 16:43
Last Modified:10 Dec 2018 15:05

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