RT Journal Article
T1 The stellar initial mass function at 0.9 < z < 1.5
A1 Pérez González, Pablo Guillermo
A1 Esquej Alonso, María del Pilar
A1 Domínguez Sánchez, Helena
A1 Espino, Néstor
AB We explore the stellar initial mass function (IMF) of a sample of 49 massive quiescent galaxies (MQGs) at 0.9 < z < 1.5. We base our analysis on intermediate resolution spectro-photometric data in the GOODS-N field taken in the near-infrared and optical with the Hubble Space Telescope Wide Field Camera 3 G141 grism and the Survey for High-z Absorption Red and Dead Sources. To constrain the slope of the IMF, we have measured the TiO2 spectral feature, whose strength depends strongly on the content of low-mass stars, as well as on stellar age. Using ultraviolet to near-infrared individual and stacked spectral energy distributions, we have independently estimated the stellar ages of our galaxies. Knowing the age of the stellar population, we interpret the strong differences in the TiO2 feature as an IMF variation. In particular, for the heaviest z similar to 1 MQGs (M > 10(11) M-circle dot), we find an average age of 1.7 +/- 0.3 Gyr and a bottom-heavy IMF (Gamma(b) = 3.2 +/- 0.2). Lighter MQGs (2 x 10(10) < M < 10(11) M-circle dot) at the same redshift are younger on average (1.0 +/- 0.2 Gyr) and present a shallower IMF slope (Gamma(b) = 2.7(-0.4)(+0.3)). Our results are in good agreement with the findings about the IMF slope in early-type galaxies of similar mass in the present-day universe. This suggests that the IMF, a key characteristic of the stellar populations in galaxies, is bottom-heavier for more massive galaxies and has remained unchanged in the last similar to 8 Gyr.
PB IOP Publishing
SN 2041-8205
YR 2015
FD 2015-01-01
LK https://hdl.handle.net/20.500.14352/33793
UL https://hdl.handle.net/20.500.14352/33793
LA eng
NO Barro, G., Pérez González, P. G., Gallego, J., et al. 2011a, ApJS, 193, 13Barro, G., Pérez González, P. G., Gallego, J., et al. 2011b, ApJS, 193, 30Bastian, N., Covey, K. R., & Meyer, M. R. 2010, ARA&A, 48, 339Bedregal, A. G., Scarlata, C., Henry, A. L., et al. 2013, ApJ, 778, 126Belli, S., Newman, A. B., & Ellis, R. S. 2014, ApJ, 783, 117Bruzual, G., & Charlot, S. 2003, MNRAS, 344, 1000Calzetti, D., Armus, L., Bohlin, R. C., et al. 2000, ApJ, 533, 682Cappellari, M., McDermid, R. M., Alatalo, K., et al. 2012, Natur, 484, 485Cenarro, A. J., Gorgas, J., Vazdekis, A., Cardiel, N., & Peletier, R. F. 2003, MNRAS, 339, L12Chabrier, G. 2003, PASP, 115, 763Charlot, S., & Fall, S. M. 2000, ApJ, 539, 718Choi, J., Conroy, C., Moustakas, J., et al. 2014, ApJ, 792, 95Conroy, C., Dutton, A. A., Graves, G. J., Mendel, J. T., & van Dokkum, P. G. 2013, ApJL, 776, L26Davé, R. 2008, MNRAS, 385, 147Ferreras, I., Trujillo, I., Mármol Queraltó, E., et al. 2013, MNRAS, 429, L15Grogin, N. A., Kocevski, D. D., Faber, S. M., et al. 2011, ApJS, 197, 35Hernán Caballero, A., Alonso Herrero, A., Pérez González, P. G., et al. 2013, MNRAS, 434, 2136Hoversten, E. A., & Glazebrook, K. 2008, ApJ, 675, 163Koekemoer, A. M., Faber, S. M., Ferguson, H. C., et al. 2011, ApJS, 197, 36Kroupa, P. 2001, MNRAS, 322, 231Kroupa, P. 2002, Sci, 295, 82Kroupa, P., Weidner, C., Pflamm-Altenburg, J., et al. 2013, in Planets, Stars, and Stellar Systems, Vol. 5, Galactic Structure and Stellar Populations, ed. G. Gilmore (Berlin: Springer), 115La Barbera, F., Ferreras, I., Vazdekis, A., et al. 2013, MNRAS, 433, 3017Le Borgne, J.-F., Bruzual, G., Pelló, R., et al. 2003, A&A, 402, 433Marchesini, D., Muzzin, A., Stefanon, M., et al. 2014, ApJ, 794, 65Martín Navarro, I., La Barbera, F., Vazdekis, A., Falcón Barroso, J., & Ferreras, I. 2014, arXiv:1404.6533Meurer, G. R., Heckman, T. M., & Calzetti, D. 1999, ApJ, 521, 64Meurer, G. R., Wong, O. I., Kim, J. H., et al. 2009, ApJ, 695, 765Mould, J. R. 1976, A&A, 48, 443Newman, A. B., Ellis, R. S., Treu, T., & Bundy, K. 2010, ApJL, 717, L103Onodera, M., Renzini, A., Carollo, M., et al. 2012, ApJ, 755, 26Pérez González, P. G., Cava, A., Barro, G., et al. 2013, ApJ, 762, 46Pérez González, P. G., Rieke, G. H., Villar, V., et al. 2008, ApJ, 675, 234Renzini, A. 2006, ARA&A, 44, 141Salpeter, E. E. 1955, ApJ, 121, 161Shetty, S., & Cappellari, M. 2014, ApJL, 786, L10Spiniello, C., Trager, S., Koopmans, L. V. E., & Conroy, C. 2014, MNRAS, 438, 1483Thomas, D., Maraston, C., Bender, R., & Mendes de Oliveira, C. 2005, ApJ, 621, 673Thomas, D., Maraston, C., & Johansson, J. 2011, MNRAS, 412, 2183Treu, T., Auger, M. W., Koopmans, L. V. E., et al. 2010, ApJ, 709, 1195van de Sande, J., Kriek, M., Franx, M., et al. 2013, ApJ, 771, 85van Dokkum, P. G. 2008, ApJ, 674, 29van Dokkum, P. G., & Conroy, C. 2010, Natur, 468, 940Vazdekis, A., Casuso, E., Peletier, R. F., & Beckman, J. E. 1996, ApJS, 106, 307Vazdekis, A., Sánchez Blázquez, P., Falcón Barroso, J., et al. 2010, MNRAS, 404, 1639Whitaker, K. E., Labbé, I., van Dokkum, P. G., et al. 2011, ApJ, 735, 86Whitaker, K. E., van Dokkum, P. G., Brammer, G., et al. 2013, ApJL, 770, L39
NO © 2015. The American Astronomical Society.  We acknowledge support from the Spanish Government grants AYA2010-21322-C03-02 and AYA2012-31277, and the ERC Advanced Grant 321323-NEOGAL. This work is based on SHARDS observations made with the Gran Telescopio Canarias (GTC), and the Rainbow Cosmological Surveys Database, operated by UCM partnered with UCO/Lick, UCSC. I.M.N. thanks Carsten Weidner, Jesús Falcón Barroso, and Mike Beasley for their careful reading and comments on the manuscript.
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