RT Journal Article
T1 Using spectroscopic data to disentangle stellar population properties
A1 Cardiel López, Nicolás
A1 Gorgas García, Francisco Javier
A1 Sánchez Blázquez, P.
A1 Cenarro, A. J.
A1 Pedraz, S.
A1 Bruzual, G.
A1 Klement, J.
AB It is well known that, when analyzed in the light of current synthesis model predictions, variations in the physical properties of single stellar populations (e.g. age, metallicity, initial mass function, element abundance ratios) may have a similar effect in their integrated spectral energy distributions. The confusion is even worsened when more realistic scenarios, i.e. composite star formation histories, are considered. This is, in fact, one of the major problems when facing the study of stellar populations in star clusters and galaxies. Typically, the observational efforts have aimed to find the most appropriate spectroscopic indicators in order to avoid, as far as possible, degeneracies in the parameter space. However, from a practical point of view, the most suited observables are not, necessarily, those that provide more orthogonality in that parameter space, but those that give the best balance between parameter degeneracy and sensitivity to signal-to-noise ratio per Angstrom, S/N(Angstrom). In order to achieve the minimum combined total error in the derived physical parameters, this work discusses how the functional dependence of typical line-strength indices and colors on S/N(Angstrom) allows to define a suitability parameter which helps to obtain more realistic combinations of spectroscopic data. As an example, we discuss in more detail the problem of breaking the well known age-metallicity degeneracy in relatively old stellar populations, comparing the suitability of different spectroscopic diagrams for a simple stellar population of solar metallicity and of 12 Gyr in age.
PB EDP Sciencies
SN 0004-6361
YR 2003
FD 2003-10
LK https://hdl.handle.net/20.500.14352/51338
UL https://hdl.handle.net/20.500.14352/51338
LA eng
NO Aaronson, M., Cohen, J. G., Mould, J., & Malkan, M. 1978, ApJ, 223, 824Aragón Salamanca, A., Gorgas, J., & Rego, M., 1987, A&A, 185, 97Arimoto, N., & Yoshii, Y. 1986, A&A, 164, 260Arimoto, N., & Yoshii, Y. 1987, A&A, 173, 23Babu, G. J., & Feigelson, E. D. 1996, Astrostatistics (London: Chapman & Hall)Bernardi, M., Sheth, R. K., Annis, J., et al. 2003, AJ, 125, 1817Blakeslee, J. P., Vazdekis, A., & Ajhar, E. A. 2001, MNRAS, 320, 193Bressan, A., Chiosi, C., & Fagotto, F. 1994, ApJS, 94, 63Bruzual, G. 1983, ApJ, 273, 105Bruzual, G. 2001, in IAU Symp. 207, Extragalactic Star Clusters, ed. E. K. Grebel, D.Geisler & D. Minniti, IAU Symp. Ser., 207, in press [astro-ph/0110245]Bruzual, G. 2002, in Proceedings of the XI Canary Islands Winter School of Astrophysics on Galaxies at High Redshifts, ed. I. Pérez Fournon, & F. Sánchez, Cambridge Contemporary Astrophysics, in press [astro-ph/0011094)]Bruzual, G., & Charlot, S. 1993, ApJ, 405, 538Buzzoni, A. 1989, ApJS, 71, 817Buzzoni, A. 1995, ApJS, 98, 69Cardiel, N. 1999, Ph.D. thesis, Universidad Complutense de MadridCardiel, N., Gorgas, J., Cenarro, J., & González, J. J. 1998, A&AS, 127, 597Cardiel, N., Gorgas, J., Gallego, J., et al. 2002, SPIE, 4847, 297Cenarro, A. J., Cardiel, N., Gorgas, J., et al. 2001, MNRAS, 326, 959Cenarro, A. J., Gorgas, J., Cardiel, N., Vazdekis, A., & Peletier, R. F. 2002, MNRAS, 329, 863Cerviño, M., & Mas-Hesse, J. M. 1994, A&A, 284, 749Cerviño, M., Luridiana, V., & Castander, F. J. 2000, A&A, 360, L5Cerviño, M., Gómez, Flechoso, M. A., Castender, F. J., et al. 2001, A&A, 376, 422Cerviño, M., Valls-Gabaud, D., Luridiana, V., & Mas-Hesse, J. M. 2002, A&A, 381, 51Cerviño, M., & Valls-Gabaud, D. 2003, MNRAS, 338, 481Charlot, S., & Bruzual, G. 1991, ApJ, 367, 126Charlot, S., Worthey, G., & Bressan, A. 1996, ApJ, 457, 625Chiosi, C., Bressan, A., & Fagotto, F. 1996, A&A, 311, 361Crampin, J., & Hoyle, F. 1961, MNRAS, 122, 27Faber, S. M., Trager, S. C., Gonz´alez, J. J., & Worthey, G. 1994, in Stellar Populations, ed. G. Gilmore & P. van der Kruit (Dordrecht: Kluwer), IAU Symp., 164, 249Fioc, M., & Rocca-Volmerange, B. 1997, A&A, 326, 950Fritze-v. Alvensleben, U. A., & Gerhard, O. E. 1994, A&A, 285, 571Fukugita, M., Shimasaku, K., & Ichikawa, T. 1995, PASP, 107, 945Gorgas, J., Faber, S. M., Burstein, D., et al. 1993, ApJS, 86, 153Gorgas, J., Cardiel, N., Pedraz, S., & González, J. J. 1999, A&AS, 139, 29Guiderdoni, B., & Rocca-Volmerange, B. 1987, A&A, 186, 1Gunn, J. E., Stryker, L. L., & Tinsley, B. 1981, ApJ, 249, 48Hammer, F., Flores, H., Lilly, S. J., et al. 1997, ApJ, 481, 49Jones, L. A., & Worthey, G. 1995, ApJ, 446, L31Kauffmann, G., Heckman, T. M., White, S. D. M., et al. 2003, MNRAS, 341, 33Kendall, M. G. 1961, A Course in the Geometry of n Dimensions, Griffin’s Statistical Monographs and Courses #8, London Koo, D. C. 1995, in Wide Field Spectroscopy and the Distant Universe, eds. S. Maddox and A. Aragón Salamanca (Singapore: World Scientific), 55Kuntschner, H., Lucey, J. R., Smith, J., Hudson, M. J., & Davies, R. L. 2001, MNRAS, 323, 615Le Fèvre, O., Saisse, M., Mancini, D., et al. 2000, SPIE, 4008, 546Leitherer, C., & Heckman, T. M. 1995, ApJS, 96, 9Leitherer, C., Alloin, D., Fritze, V., Alvensleben, H., et al. 1996, PASP, 108, 996Leitherer, C., Schraerer, D., Goldader, J. D., et al. 1999, ApJS, 123, 3Lilly, S. J., Le Fèvre, O., Crampton, D., Hammer, F., & Tresse, L. 1995, ApJ, 455, 50Maraston, C. 1998, MNRAS, 300, 872García Vargas, M. L., Mollá, M., & Bressan, A. 1998, A&AS, 130, 513Mas-Hesse, J. M., & Kunth, D. 1991, A&AS, 88, 399Mayya, Y. D. 1995, AJ, 109, 2503Mayya, Y. D. 1997, ApJ, 482, L149Milone, A., Barbuy, B., & Bica, E. 1995, A&AS, 113, 547Mollá, M., & García Vargas, M. L. 2000, A&A, 359, 18Mould, J. 1993, in Sky Surveys: Protostars to Protogalaxies, ed. B. T.Soifer, ASP Conf. Ser., 43, 281O’Connell, R. W. 1976, ApJ, 206, 370O’Connell, R. W. 1980, ApJ, 236, 430O’Connell, R. W. 1994, in Nuclei of Normal Galaxies: Lessons from the Galactic Center, ed. R. Genzel (Dordrecht: Kluwer), 255Origlia, L., & Oliva, E. 2000, A&A, 357, 610Pickles A. J. 1998, PASP, 110, 863Rose, J. A. 1985, AJ, 90, 1927Rose, J. A. 1994, AJ, 107, 206Schiavon, R. P., Barbuy, B., & Bruzual, G. 2000, ApJ, 532, 453Tantalo, R., Chiosi, C., Bressan, A., Marigo, P., & Portinari, L. 1998, A&A, 335, 823Thomas, D., Maraston, C., & Bender, R. 2003, MNRAS, 339, 897Tinsley, B. 1972, ApJ, 178, 319Tinsley, B. 1978, ApJ, 222, 14Tinsley, B. 1980, Fund. Cos. Phys., 5, 287Tinsley, B., & Gunn, J. E. 1976, ApJ, 203, 52Vazdekis, A. 1999, ApJ, 513, 224Vazdekis, A., & Arimoto, N. 1999, 525, 144Vazdekis, A., Casuso, E., Peletier, R. F.,& Beckman, J. E. 1996, ApJS, 106, 307Vazdekis, A., Peletier, R. F., Beckman, J. E.,& Casuso, E. 1997, ApJS, 111, 203Vazdekis, A., Cenarro, A. J., Gorgas, J., Cardiel, N., & Peletier, F. F. 2003, MNRAS, 340, 1317Wegner, G., Colless, M., Baggley, G., et al. 1996, ApJS, 106, 1Worthey, G. 1994, ApJS, 95, 107Worthey, G., Faber, S. M., González, J. J., & Burstein, D. 1994, ApJS, 94, 687Worthey, G., & Ottaviani. D. L. 1997, ApJS, 111, 377York, D. G., Adelman, J., Anderson, J. E., et al. 2000, AJ, 120, 1579Zackrisson, E., Bergvall, N., Olofsson, K., & Siebert, A. 2001, A&A, 375, 814
NO © ESO 2003. Valuable discussions with A. Vazdekis, and J. J. González are gratefully acknowledged. The data employed in Appendix A was obtained with the 1m JKT, 2.5m INT and the 4.2m WHT at La Palma Observatory, and with the 3.5m Telescope at Calar Alto Observatory. The JKT, INT and WHT are operated on the island of La Palma by the Royal Greenwich Observatory at the Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The Calar Alto Observatory is operated jointly by the Max-Planck-Institute fur Astronomie, Heidelberg, and the Spanish Comisión Nacional de Astronomía. This work was supported by the Spanish Programa Nacional de Astronomía y Astrofísica under grant AYA2000-977.
NO Spanish Programa Nacional de Astronomía y Astrofísica
DS Docta Complutense
RD 30 abr 2024