IMF shape constraints from stellar populations and dynamics from CALIFA
Por:
Lyubenova, M., Martin-Navarro, I., van de Ven, G., Falcon-Barroso, J., Galbany, L., Gallazzi, A., Garcia-Benito, R., Gonzalez Delgado, R., Husemann, B., La Barbera, F., Marino, R. A., Mast, D., Mendez-Abreu, J., Peletier, R. F. P., Sanchez-Blazquez, P., Sanchez, S. F., Trager, S. C., van den Bosch, R. C. E., Vazdekis, A., Walcher, C. J., Zhu, L., Zibetti, S., Ziegler, B., Bland-Hawthorn, J., CALIFA Collaboration
Publicada:
1 dic 2016
Resumen:
In this Paper, we describe how we use stellar dynamics information to
constrain the shape of the stellar initial mass function (IMF) in a
sample of 27 early-type galaxies from the CALIFA survey. We obtain
dynamical and stellar mass-to-light ratios, gamma(dyn) and gamma(*),
over a homogenous aperture of 0.5 R-e. We use the constraint gamma(dyn)
>= gamma(*) to test two IMF shapes within the framework of the
extended MILES stellar population models. We rule out a single power-law
IMF shape for 75 per cent of the galaxies in our sample. Conversely, we
find that a double power-law IMF shape with a varying high-mass end
slope is compatible (within 1 sigma) with 95 per cent of the galaxies.
We also show that dynamical and stellar IMF mismatch factors give
consistent results for the systematic variation of the IMF in these
galaxies.
Filiaciones:
Lyubenova, M.:
Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands
Martin-Navarro, I.:
Inst Astrofis Canarias, Via Lactea S-N, Tenerife, Spain
Univ La Laguna, Dept Astrofis, E-38205 Tenerife, Spain
Univ Calif Observ, 1156 High St, Santa Cruz, CA 95064 USA
van de Ven, G.:
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Falcon-Barroso, J.:
Inst Astrofis Canarias, Via Lactea S-N, Tenerife, Spain
Univ La Laguna, Dept Astrofis, E-38205 Tenerife, Spain
Galbany, L.:
Millennium Inst Astrophys, Santiago, Chile
Univ Chile, Dept Astron, Camino El Observ 1515, Santiago, Chile
Gallazzi, A.:
INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy
Garcia-Benito, R.:
CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N,Aptdo 3004, E-18080 Granada, Spain
Gonzalez Delgado, R.:
CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N,Aptdo 3004, E-18080 Granada, Spain
Husemann, B.:
ESO, Karl Schwarzscild Str 2, D-85748 Garching, Germany
La Barbera, F.:
INAF Osservatorio Astron Capodimonte, Naples, Italy
Marino, R. A.:
ETH, Inst Astron, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland
Mast, D.:
Astron Observ, Laprida 854,X5000BGR, Cordoba, Argentina
Consejo Invest Cient & Tecn Republ Argentina, Avda Rivadavia 1917,C1033AAJ, Caba, Argentina
Mendez-Abreu, J.:
Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
Peletier, R. F. P.:
Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands
Sanchez-Blazquez, P.:
Univ Autonoma Madrid, Dept Fis Teor, E-28049 Canto Blanco, Spain
Pontifica Univ Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
Sanchez, S. F.:
Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico
Trager, S. C.:
Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands
van den Bosch, R. C. E.:
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Vazdekis, A.:
Inst Astrofis Canarias, Via Lactea S-N, Tenerife, Spain
Univ La Laguna, Dept Astrofis, E-38205 Tenerife, Spain
Walcher, C. J.:
Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
Zhu, L.:
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Zibetti, S.:
INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy
Ziegler, B.:
Univ Vienna, Turkenschanzstr 17, A-1180 Vienna, Austria
Bland-Hawthorn, J.:
Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia
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