Testing Evolutionary Population Synthesis models with Early Type Galaxies in the Near Infrared

Luis Gabriel Dahmer-Hahn1,2*, Alberto Rodríguez-Ardila3, Rogério Riffel1, Lucimara P. Martins4, Carolina Kehrig5, Timothy M. Heckman6, Miriani G. Pastoriza1, Natacha Z. Dametto1
1Departamento de Astronomia, Universidade Federal do Rio Grande do Sul. Av. Bento Goncalves 9500, Porto Alegre, RS, Brazil.
2Instituto de Física e Química, Universidade Federal de Itajubá, Brasil.
3Laboratório Nacional de Astrofísica - Rua dos Estados Unidos 154, Bairro das Nações. CEP 37504-364, Itajubá, MG, Brazil.
4NAT - Universidade Cruzeiro do Sul, Rua Galvão Bueno, 868, São Paulo, SP, Brazil.
5Instituto de Astrofísica de Andalucía, CSIC, Apartado de correos 3004, 18080 Granada, Spain.
6Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA.

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We employed Apache Point Observatory TripleSpec near infrared spectra (NIR, ~1.0µm-2.4µm) of 6 early-type galaxies, and one spiral galaxy, to test 5 evolutionary population synthesis models in the near infrared. We used 3 low spectral resolution and 2 high spectral resolution bases of simple stellar populations (SSPs) and found that, when using bases with low spectral resolution, the result depends more on the base used than on the galactic properties themselves. For high spectral resolution bases, the same result could not be tested because these bases do not include SSPs younger than 1 Gyr. However, these two bases produced di erent results, with differences up to 70 percent in one object.

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Keywords : galaxies: stellar content – stars: AGB and post-AGB – infrared: galaxies