Velocity Dispersions and Stellar Populations of the Most Compact and Msssive early-Type Galaxies at Redshift similar to 1



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Martínez Manso, Jesús and Guzmán, Rafael and Barro, Guillermo and Cenarro, Javier and Pérez González, Pablo Guillermo and Sánchez Blázquez, Patricia and Trujillo, Ignacio and Balcells, Marc and Cardiel López, Nicolás and Hempel, Angela and Prieto, Mercedes (2011) Velocity Dispersions and Stellar Populations of the Most Compact and Msssive early-Type Galaxies at Redshift similar to 1. Astrophysical journal letters, 738 (2). ISSN 2041-8205

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We present Gran-Telescopio-Canarias/OSIRIS optical spectra of four of the most compact and massive early-type galaxies (ETGs) in the Groth Strip Survey at redshift z similar to 1, with effective radii R-e = 0.5-2.4 kpc and photometric stellarmasses M-star = (1.2-4) x 10(11)M(circle dot). We find that these galaxies have velocity dispersions sigma = 156-236 km s(-1). The spectra are well fitted by single stellar population models with approximately 1 Gyr of age and solar metallicity. We find that (1) the dynamical masses of these galaxies are systematically smaller by a factor of similar to 6 than the published stellarmasses using BRIJK photometry, and (2) when estimating stellarmasses as 0.7xM(dyn), a combination of passive luminosity fading with mass/size growth due to minor mergers can plausibly evolve our objects to match the properties of the local population of ETGs.

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© 2011 The American Astronomical Society. This wor0k is partially funded by the Spanish MICINN under the Consolider-Ingenio 2010 Program grant CSD2006-00070: First Science with the GTC. J. M. M. acknowledges funding from a Graduate Alumni Fellowship at the University of Florida. The Spanish MICINN provides support to M. B., M. P., and A. H. through grant AYA2009-11137 and to J. G. through grant AYA2009-10368. Our observations were made with the GTC Telescope at the Spanish Observatorio del Roque de los Muchachos, which is managed by the Instituto de Astrofísica de Canarias. We are grateful to the personnel who took the observations and to Ana Matkovic for her help with the use of the REDucmE software. We also thank the anonymous referee for useful comments that improved the presentation of this Letter.

Uncontrolled Keywords:Star-formation rates; To-fir analysis; Size evolution; Fundamental plane; Elliptic galaxies; Spitzer/Irac sources; Lenticular galaxies; Kormendy relation; Sauron project; Field galaxies
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:27876
Deposited On:15 Jan 2015 10:26
Last Modified:10 Dec 2018 15:05

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