Artículo
Abstract:
We use cosmological hydrodynamical simulations including star formation and metal enrichment to study the evolution of the chemical properties of galaxy-like objects at high redshift in the range 0.25 < z < 2.35 in a hierarchical clustering scenario. We find that as the galactic objects are assembled, their gaseous components exhibit neutral hydrogen column densities with abundances and scatter comparable to those observed in damped Lyα systems (DLAs). The unweighted mean of abundance ratios and least-square linear regressions through the simulated DLAs yield intrinsic metallicity evolution for [Zn/H] and [Fe/H] consistent with results obtained from similar analyses of available observations. Our model statistically reproduces the mild evolution detected in the metallicity of the neutral hydrogen content of the universe, given by mass-weighted means, if observational constraints are considered (as suggested in 1998 by Boissée and co-workers). For the α-elements in the simulated DLAs, we find neither enhancement nor dependence on metallicity. Our results support the hypotheses that DLAs trace a variety of galactic objects with different formation histories and that both Type I and Type II supernovae are contributing to the chemical enrichment of the gas component, at least since z ≈ 2. This study indicates that DLAs could be understood as the building blocks that merged to form current normal galaxies within a hierarchical clustering scenario.
Registro:
| Documento: | Artículo |
| Título: | Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models |
| Autor: | Tissera, P.B.; Lambas, D.G.; Mosconi, M.B.; Cora, S. |
| Filiación: | Inst. Astronomia y Fis. del Espacio, Casilla de Correo 67, Sucursal 28, Buenos Aires 1428, Argentina Observ. Astron. Univ. Nac. Cordoba, Laprida 854, Córdoba 5000, Argentina Observ. Astron. Univ. Nac. La Plata, Paseo del Bosque s/n, La Plata, BA, B1900FWA, Argentina |
| Palabras clave: | Cosmology: Theory; Dark matter; Galaxies: Abundances; Galaxies: Evolution; Galaxies: Formation; Methods: Numerical |
| Año: | 2001 |
| Volumen: | 557 |
| Número: | 2 PART 1 |
| Página de inicio: | 527 |
| Página de fin: | 532 |
| DOI: | http://dx.doi.org/10.1086/321672 |
| Título revista: | Astrophysical Journal |
| Título revista abreviado: | Astrophys. J. |
| ISSN: | 0004637X |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v557_n2PART1_p527_Tissera |
Referencias:
- Boissé, P., Le Brun, V., Bergeron, J., Deharverng, J.M., (1998) A&A, 333, p. 841
- Cen, R., Ostriker, J.P., (1999) ApJ, 519, pp. L109
- Cora, S.A., Mosconi, M.B., Tissera, P.B., Lambas, D.G., (2000) ASP Conf. Ser. 221, Stars, Gas and Dust in Galaxies : Exploring the Links, 221, p. 283. , ed. D. Alloin, K. Olsen, & G. Galaz (San Francisco, ASP)
- Edmunds, M.G., Phillips, S., (1997) MNRAS, 292, p. 733
- Haehnelt, M.G., Steinmetz, M., Rauch, M., (1998) ApJ, 495, p. 647
- Hou, J.L., Boissier, S., Prantzos, N., (2001) A&A, 370, p. 23
- Jimenez, R., Bowen, D.V., Matteucci, F., (1999) ApJ, 514, pp. L83
- Le Brun, V., Bergeron, J., Boissé, P., Deharveng, J.M., (1997) A&A, 321, p. 733
- Lu, L., Sargent, W.L.W., Barlow, T.A., Churchill, C.W., Vogt, S.S., (1996) ApJS, 107, p. 475
- Mosconi, M.B., Tissera, P.B., Lambas, D.G., Cora, S.A., (2001) MNRAS, 325, p. 34. , 2001
- Pei, Y.C., Fall, S.M., Hauser, M.G., (1999) ApJ, 522, p. 604
- Pettini, M., Smith, L., King, D., Hunstead, R., (1997) ApJ, 486, p. 665
- Pettini, M., Ellison, S.L., Steidel, C.C., Bowen, D.V., (1999) ApJ, 510, p. 576
- Pettini, M., Ellison, S.L., Steidel, C.C., Shapley, A.E., Bowen, D.V., (2000) ApJ, 532, p. 65
- Prantzos, N., Boissier, S., (2000) MNRAS, 315, p. 82
- Prochaska, J.X., Wolfe, A.M., (1997) ApJ, 487, p. 73
- (1999) ApJS, 121, p. 369
- (2000) ApJ, 533, pp. L5
- Prochaska, J.X., Naumov, S.O., Carney, B.W., McWilliam, A., Wolfe, A.M., (2000) AJ, 120, p. 2513
- Rao, S.M., Briggs, F.H., (1993) ApJ, 419, p. 515
- Savaglio, S., (2000) IAU Symp. 204, The Extragalactic Infrared Background and Its Cosmological Implications, 204, p. 24. , ed. M. Harwit & M. Hauser (San Francisco: ASP)
- Somerville, R.S., Primack, J.R., Faber, S.M., (2001) MNRAS, 320, p. 504
- Thielemann, F.K., Nomoto, K., Hashimoto, M., (1993) Origin and Evolution of the Elements, p. 297. , ed. N. Prantzos, E. Vangoni-Flam, & N. Cassé (Cambridge: Cambridge Univ. Press)
- Tissera, P.B., (2000) ApJ, 534, p. 636
- Tissera, P.B., Lambas, D.G., Abadi, M.G., (1997) MNRAS, 286, p. 384
- Vladilo, G., (1998) ApJ, 493, p. 583
- Vladilo, G., Bonifacio, P., Centurion, M., Molaro, P., (2000) ApJ, 543, p. 24
- Wolfe, A.M., Turnshek, D.A., Smith, H.E., Cohen, R.D., (1986) ApJS, 61, p. 249
- Wolfe, A.M., Lanzetta, K.M., Foltz, C.B., Chaffee, F.J., (1995) ApJ, 454, p. 698
- Woosley, S.E., Weaver, T.A., (1995) ApJS, 101, p. 181
Citas:
---------- APA ----------
Tissera, P.B., Lambas, D.G., Mosconi, M.B. & Cora, S. (2001) . Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models. Astrophysical Journal, 557(2 PART 1), 527-532.http://dx.doi.org/10.1086/321672
---------- CHICAGO ----------
Tissera, P.B., Lambas, D.G., Mosconi, M.B., Cora, S. "Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models" . Astrophysical Journal 557, no. 2 PART 1 (2001) : 527-532.http://dx.doi.org/10.1086/321672
---------- MLA ----------
Tissera, P.B., Lambas, D.G., Mosconi, M.B., Cora, S. "Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models" . Astrophysical Journal, vol. 557, no. 2 PART 1, 2001, pp. 527-532.http://dx.doi.org/10.1086/321672
---------- VANCOUVER ----------
Tissera, P.B., Lambas, D.G., Mosconi, M.B., Cora, S. Chemical enrichment at high redshifts: Understanding the nature of damped Lyα systems in hierarchical models. Astrophys. J. 2001;557(2 PART 1):527-532.http://dx.doi.org/10.1086/321672
