Publication: Robust determination of the major merger fraction at z=0.6 in the groth strip
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2009-03-20
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American Astronomical Society
Abstract
We measure the fraction of galaxies undergoing disk-disk major mergers (∫^mph_m) at intermediate redshifts ((0.35 ≤ z < 0.85) by studying the asymmetry index A of galaxy images. Results are provided for B- and K_s-band absolute magnitude selected samples from the Groth strip in the galaxy origins and young assembly photometric survey. Three sources of systematic error are carefully addressed and quantified. The effects of the large errors in the photometric redshifts and asymmetry indices are corrected with maximum-likelihood techniques. Biases linked to the redshift degradation of the morphological information in the images are treated by measuring asymmetries on images artificially redshifted to a reference redshift of z_d = 0.75. Morphological K-corrections are further constrained by remaining within redshifts where the images sample redward of 4000 angstrom. We find that: (1) our data allow for a robust merger fraction to be provided for a single redshift bin, which we center at z = 0.6. (2) Merger fractions at that z have lower values than previous determinations: ∫_m^mph = 0.045^-0.011_+0.014 for M_B ≤ -20 galaxies, and f_m^mph = 0.031(-0.009)(+0.013) for M(Ks) <= - 23.5 galaxies. And, (3) failure to address the effects of the large observational errors leads to overestimating f_m^mph by factors of 10%-60%. Combining our results with those on other B-band selected samples, and parameterizing the merger fraction evolution as ∫_m^mph (z) = ∫_m^mph (0)(1 + z)^m, we obtain that m = 2.9 ± 0.8, and ∫_m^mph (0) = 0.012 ± 0.004. For an assumed merger timescale between 0.35 0.6 Gyr, these values imply that only 20%-35% of present-day M_B ≤ -20 galaxies have undergone a disk-disk major merger since z ∽ 1. Assuming a K_s -band mass-to- light ratio not varying with luminosity, we infer that the merger rate of galaxies with stellarmass M(star) greater than or similar to 3.5 x 10^10 M_☉ is R_m = 1.6_-0.6^+0.9 x 10^-4 Mpc^-3 Gyr^-1 at z = 0.6. When we compare with previous studies at similar redshifts, we find that the merger rate decreases when mass increases.
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© 2009. The American Astronomical Society.
We dedicate this paper to the memory of our six IAC colleagues and friends who met with a fatal accident in Piedra de los Cochinos, Tenerife, in 2007 February. Special thanks go to Maurizio Panniello, whose teachings of python were so important for this paper.This work was supported by the Spanish Programa Nacional de Astronomía y Astrofísica through project number AYA2006-12955.
Facilities: HST (WFPC2); ING:Herschel (INGRID); ING:Newton (WFC)
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Abadi, M. G., Navarro, J. F., Steinmetz, M., & Eke, V. R. 2003, ApJ, 591, 499
Abraham, R. G., Tanvir, N. R., Santiago, B. X., Ellis, R. S., Glazebrook, K., & van der Bergh, S. 1996, MNRAS, 279, L47
Arnouts, S., et al. 2007, A&A, 476, 137
Balcells, M., Cristóbal Hornillos, D., & Eliche Moral, M. C. 2003, RevMexAA, 16, 259
Bekki, K., & Shioya, Y. 2001, ApJS, 134, 241
Bell, E. F., & de Jong, R. S. 2001, ApJ, 550, 212
Bell, E. F., et al. 2004, ApJ, 608, 752
Bell, E. F., et al. 2006, ApJ, 652, 270
Blumenthal, G. R., Faber, S. M., Primack, J. R., & Ress, M. J. 1984, Nature, 311, 517
Bolzonella, M., Miralles, J. M., & Peló, R. 2000, A&A, 363, 476
Bournaud, F., Jog, C. J., & Combes, F. 2005, A&A, 437, 69
Bridge, C. R., et al. 2007, ApJ, 659, 931
Bundy, K., Fukugita, M., Ellis, R. S., Kodama, T., & Conselice, C. J. 2004, ApJ, 601, L123
Cassata, P., et al. 2005, MNRAS, 357, 903
Cirasuolo, M., McLure, R. J., Dunlop, J. S., Almaini, O., Foucaud, S., & Simpson, C. 2008, arXiv:0804.3471
Conselice, C. J. 2003, ApJS, 147, 1 (C03)
Conselice, C. J. 2006, ApJ, 638, 686
Conselice, C. J., Bershady, M. A., Dickinson, M., & Papovich, C. 2003, AJ, 126, 1183
Conselice, C. J., Bershady, M. A., & Jangen, A. 2000, ApJ, 529, 886
Conselice, C. J., Blackburne, J. A., & Papovich, C. 2005, ApJ, 620, 564
Conselice, C. J., Sheena, R., & Myers, R. 2008, MNRAS, 386, 909
Cristóbal Hornillos, D., et al. 2003, ApJ, 595, 71
De Lucia, G., Springel, V., White, S. D. M., Croton, D., & Kauffmann, G. 2006, MNRAS, 366, 499
De Propris, R., Liske, J., Driver, S. P., Allen, P. D., & Cross, N. J. 2005, AJ, 130, 1516
De Propris, R., et al. 2007, ApJ, 666, 212
de Ravel, L., et al. 2008, A&A, in press (arXiv:0807.2578)
D’Onghia, E., & Burkert, A. 2004, ApJ, 612, L13
Drory, N., et al. 2004, ApJ, 608, 742
Eliche Moral, M. C., Balcells, M., Aguerri, J. A. L., & González García, A. C. 2006a, A&A, 457, 91
Eliche Moral, M. C., Balcells, M., Prieto, M., García Dabo, C. E., Erwin, P., & Cristóbal Hornillos, D. 2006b, ApJ, 639, 644
Faber, S. M., et al. 2007, ApJ, 665, 265
Fukugita, M., Shimasaku, K., & Ichikawa, T. 1995, 107, 945
González García, A. C., & Balcells, M. 2005, MNRAS, 357, 753
González García, A. C., & van Albada, T. S. 2003, MNRAS, 342, L36
Groth, E. J., et al. 1994, BAAS, 210, 1403
Guzmán, R. 2003, RevMexAA, 16, 209
Hopkins, P. F., Hernquist, L., Cox, T. J., Dutta, S. N., & Rothberg, B. 2008, ApJ, 679, 156
Hsieh, B. C., Yee, H. K. C., Lin, H., Gladders, M. D., & Gilbank, D. G. 2008, ApJ, 683, 33
Jogee, S., et al. 2008, ApJ, submitted
Kampczyk, P., et al. 2007, ApJS, 172, 329
Kartaltepe, J. S., et al. 2007, ApJS, 172, 320
Kuchinski, L. E., et al. 2000, ApJS, 131, 441
Lavery, R. J., Remijan, A., Charmandaris, V., Hayes, R. D., & Ring, A. A. 2004, ApJ, 612, 679
Le Fèvre, O., et al. 2000, MNRAS, 311, 565
Lin, L., et al. 2004, ApJ, 617, L9
Lin, L., et al. 2008, ApJ, 681, 232
López Sanjuan, C., Balcells, M., Pérez González, P. G., Barro, G., García Dabo, C. E., Gallego, J., & Zamorano, J. 2009, A&A, submitted
López Sanjuan, C., García Dabo, C. E., & Balcells, M. 2008, PASP, 120, 571 (LGB08)
Lotz, J. M., Jonsson, P., Cox, T. J., & Primack, J. R. 2008a, MNRAS, 391, 1137
Lotz, J. M., Primack, J., & Madau, P. 2004, AJ, 128, 163
Lotz, J. M., et al. 2008b, ApJ, 672, 177 (L08)
Naab, T., & Burkert, A. 2003, ApJ, 597, 893
Naab, T., Khochfar, S., & Burkert, A. 2006, ApJ, 636, L81
Oyaizu, H., Lima, M., Cunha, C. E., Lin, H., & Frieman, J. 2008, ApJ, 289, 709
Patton, D. R., & Atfield, J. E. 2008, ApJ, 685, 235
Patton, D. R., Carlberg, R. G., Marzke, R. O., Pritchet, C. J., da Costa, L. N., & Pellegrini, P. S. 2000, ApJ, 536, 153
Patton, D. R., et al. 2002, ApJ, 565, 208
Ratnatunga, K. U., Griffiths, R. E., & Ostrander, E. J. 1999, AJ, 118, 86
Ratnatunga, K. U., Ostrander, E. J., Griffiths, R. E., & Im, M. 1995, ApJ, 453, L5
Rawat, A., Hammer, F., Kembhavi, A. K., & Flores, H. 2008, ApJ, 681, 1089
Ryan, R. E., Jr, Cohen, S. H., Windhorst, R. A., & Silk, J. 2008, ApJ, 678, 751
Sanders, D. B., Soifer, B. T., Elias, J. H., Madore, B. F., Matthews, K., Neugebauer, G., & Scoville, N. Z. 1988, ApJ, 325, 74
Simard, L., et al. 2002, ApJS, 142, 1
Springel, V., et al. 2005, Nature, 435, 629
Taylor-Mager, V. A., Conselice, C. J., Windhorst, R- A., & Jansen, R. A. 2007, ApJ, 659, 162
Trujillo, I., Conselice, C. J., Bundy, K., Cooper, M. C., Eisenhardt, P., & Ellis, R. S. 2007, MNRAS, 382, 109
van den Bosch, F. C. 2001, MNRAS, 327, 1334
van Dokkum, P. G., et al. 2008, ApJ, 677