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Durham University

Department of Physics

Staff profile

Publication details for Dr Russell Smith

Nelan, J. E., Smith R. J., Hudson M. J., Wegner G. A., Lucey J. R., Moore S. A. W., Quinney S. J. & Suntzeff N. B. (2005). NOAO fundamental plane survey II: Age and metallicity along the red sequence from line-strength data. Astrophysical Journal 632(1): 137-156.

Author(s) from Durham

Abstract

We present spectroscopic line-strength data for 4097 red-sequence galaxies in 93 low-redshift galaxy clusters and use these to investigate variations in average stellar populations as a function of galaxy mass. Our analysis includes an improved treatment of nebular emission contamination, which affects 10% of the sample galaxies. Using the stellar population models of D. Thomas and collaborators, we simultaneously fit 12 observed line-strength relations in terms of common underlying trends of age, [Z/H] (total metallicity), and [/Fe] (-element enhancement). We find that the observed line-strength relations can be explained only if higher mass red-sequence galaxies are, on average, older, more metal-rich, and more -enhanced than lower mass galaxies. Quantitatively, the scaling relations are age0.59±0.13, Z/H0.53±0.08, and /Fe0.31±0.06, where the errors reflect the range obtained using different subsets of indices. Our conclusions are not strongly dependent on which Balmer lines are used as age indicators. The derived age- relation is such that if the largest (400 km s-1) galaxies formed their stars 13 Gyr ago, then the mean age of low-mass (50 km s-1) objects is only 4 Gyr. The data also suggest a large spread in age at the low-mass end of the red sequence, with 68% of the galaxies having ages between 2 and 8 Gyr. We conclude that although the stars in giant red galaxies in clusters formed early, most of the galaxies at the faint end joined the red sequence only at recent epochs. This "downsizing" trend is in good qualitative agreement with observations of the red sequence at higher redshifts but is not predicted by semianalytic models of galaxy formation

References

Abazajian, K., et al. 2004, AJ, 128, 502
Balogh, M. L., Morris, S. L., Yee, H. K. C., Carlberg, R. G., & Ellingson, E.
1999, ApJ, 527, 54
Bender, R., Burstein, D., & Faber, S. M. 1993, ApJ, 411, 153
Bernardi, M., et al. 2003, AJ, 125, 1882
Bower, R. G., Lucey, J. R., & Ellis, R. S. 1992, MNRAS, 254, 601
Burstein, D., Faber, S. M., Gaskell, C. M., & Krumm, N. 1984, ApJ, 287, 586
Caldwell, N., Rose, J. A., & Concannon, K. D. 2003, AJ, 125, 2891
Cardiel, N., Gorgas, J., Cenarro, J., & Gonzalez, J. J. 1998, A&AS, 127, 597
Cenarro, A. J., Cardiel, N., Gorgas, J., Peletier, R. F., Vazdekis, A., & Prada, F.
2001, MNRAS, 326, 959
Cole, S., Lacey, C. G., Baugh, C. M., & Frenk, C. S. 2000, MNRAS, 319,
168
Colless, M., Burstein, D., Davies, R. L., McMahan, R. K., Saglia, R. P., &
Wegner, G. 1999, MNRAS, 303, 813
Cowie, L. L., Songaila, A., Hu, E. M., & Cohen, J. G. 1996, AJ, 112, 839
Davies, R. L., Burstein, D., Dressler, A., Faber, S. M., Lynden-Bell, D.,
Terlevich, R. J., & Wegner, G. 1987, ApJS, 64, 581
De Lucia, G., et al. 2004, ApJ, 610, L77
Djorgovski, S., & Davis, M. 1987, ApJ, 313, 59
Dressler, A., Lynden-Bell, D., Burstein, D., Davies, R. L., Faber, S. M.,
Terlevich, R. J., & Wegner, G. 1987, ApJ, 317, 42.
Ebeling, H., Edge, A. C., Bohringer, H., Allen, S. W., Crawford, C. S., Fabian,
A. C., Voges, W., & Huchra, J. P. 1998, MNRAS, 301, 881
Ebeling, H., Voges,W., Bohringer, H., Edge, A. C., Huchra, J. P., & Briel, U. G.
1996, MNRAS, 281, 799
Faber, S. M., & Jackson, R. E. 1976, ApJ, 204, 668
Gonza´lez, J. J. 1993, Ph.D. thesis, Univ. California, Santa Cruz
Goudfrooij, P., de Jong, T., Hansen, L., & Norgaard-Nielsen, H. U. 1994,
MNRAS, 271, 833
Harris, W. E., & Harris, G. L. H. 2002, AJ, 123, 3108
Herbig, G. H., & Mayall, N. U. 1957, PASP, 69, 563
Jorgensen, I. 1997, MNRAS, 288, 161
Jorgensen, I., Franx, M., & Kjaergaard, P. 1995, MNRAS, 276, 1341
Kauffmann, G., & Charlot, S. 1998, MNRAS, 294, 705
Kauffmann, G., White, S. D. M., Heckman, T. M., Me´nard, B., Brinchmann, J.,
Charlot, S., Tremonti, C., & Brinkmann, J. 2004, MNRAS, 353, 713
Kinney, A. L., Calzetti, D., Bohlin, R. C., McQuade, K., Storchi-Bergmann, T.,
& Schmitt, H. R. 1996, ApJ, 467, 38
Kuntschner, H., Lucey, J. R., Smith, R. J., Hudson, M. J., & Davies, R. L. 2001,
MNRAS, 323, 615
Kuntschner,H., Smith, R. J.,Colless,M.,Davies, R. L.,Kaldare,R., &Vazdekis,A.
2002, MNRAS, 337, 172
Maraston, C. 1998, MNRAS, 300, 872
Maraston, C., & Thomas, D. 2000, ApJ, 541, 126
Mehlert, D., Thomas, D., Saglia, R. P., Bender, R., & Wegner, G. 2003, A&A,
407, 423
Moore, S. A. W., Lucey, J. R., Kuntschner, H., & Colless, M. 2002, MNRAS,
336, 382
Phillips, M. M., Jenkins, C. R., Dopita, M. A., Sadler, E. M., & Binette, L.
1986, AJ, 91, 1062
Poggianti, B. M., Bridges, T. J.,Komiyama,Y.,Yagi,M., Carter,D.,Mobasher, B.,
Okamura, S., & Kashikawa, N. 2004, ApJ, 601, 197
Poggianti, B. M., et al. 2001, ApJ, 562, 689
Proctor, R. N. 2002, Ph.D. thesis, Univ. Central Lancashire
Proctor, R. N., Forbes, D. A., & Beasley, M. A. 2004a, MNRAS, 355, 1327
Proctor, R. N., Forbes, D. A., Hau, G. K. T., Beasley, M. A., De Silva, G. M.,
Contreras, R., & Terlevich, A. I. 2004b, MNRAS, 349, 1381
Saglia, R. P., Maraston, C., Thomas, D., Bender, R., & Colless, M. 2002, ApJ,
579, L13
Sandage, A., & Visvanathan, N. 1978, ApJ, 225, 742
Schiavon, R. P., Rose, J. A., Courteau, S., & MacArthur, L. A. 2004, ApJ, 608,
L33
Simard, L., et al. 2002, ApJS, 142, 1
Smail, I., Edge, A. C., Ellis, R. S., & Blandford, R. D. 1998, MNRAS, 293,
124
Smith, R. J. 2005, MNRAS, 359, 975
Smith, R. J., et al. 2004, AJ, 128, 1558 (Paper I )
Stasin´ska, G., Mateus, A., Sodre´, L., & Szczerba, R. 2004, A&A, 420, 475
Terlevich, A. I., & Forbes, D. A. 2002, MNRAS, 330, 547
Thomas, D., Maraston, C., & Bender, R. 2003, MNRAS, 339, 897 (TMB03)
Thomas, D., Maraston, C., Bender, R., & Mendes de Oliveira, C. 2005, ApJ,
621, 673
Thomas, D., Maraston, C., & Korn, A. 2004, MNRAS, 351, L19
Trager, S. C., Faber, S. M.,Worthey, G., & Gonza´lez, J. J. 2000a, AJ, 119, 1645
———. 2000b, AJ, 120, 165
Trager, S. C., Worthey, G., Faber, S. M., Burstein, D., & Gonzalez, J. J. 1998,
ApJS, 116, 1
Tran, K. H., Franx, M., Illingworth, G., Kelson, D. D., & van Dokkum, P. 2003,
ApJ, 599, 865
van Dokkum, P. G., & Ellis, R. S. 2003, ApJ, 592, L53
Vazdekis, A. 1999, ApJ, 513, 224
Wegner,G.,Colless,M., Saglia,R. P., McMahan, R. K.,Davies, R. L.,Burstein, D.,
& Baggley, G. 1999, MNRAS, 305, 259
Worthey, G. 1994, ApJS, 95, 107
Worthey, G., & Ottaviani, D. L. 1997, ApJS, 111, 377
Wuyts, S., van Dokkum, P. G., Kelson, D. D., Franx, M., & Illingworth, G. D.
2004, ApJ, 605, 677.