arXiv · 0808.3407
The close environment of 24 micron galaxies at 0.6<z<1.0 in the COSMOS field
Abstract
We investigate the close environment of 203 Spitzer 24 micron-selected sources at 0.6 1.4. We find that LIRGs at 0.6 1.4 within 1 Mpc and +/- 500 km/s). The contrast between the activities of the close environments of LIRGs and ULIRGs appears especially enhanced in the COSMOS field density peak at z~0.67, because LIRGs on this peak have a larger fraction of passive neighbours, while ULIRGs have as active close environments as those outside the large-scale structure. The differential environmental activity is related to the differences in the distributions of stellar mass ratios between LIRGs/ULIRGs and their close neighbours, as well as in the general local density fields. At 0.8<z<1.0, instead, we find no differences in the environment densities of ULIRGs and other similarly massive galaxies, in spite of the differential activities. We discuss a possible scenario to explain these findings.
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K. I. Caputi, K. Kovac, M. Bolzonella, S. J. Lilly, G. Zamorani, H. Aussel, D. Sanders, S. Bardelli, A. Bongiorno, T. Contini, G. Coppa, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, D. Frayer, B. Garilli, A. Iovino, P. Kampczyk, J. -P. Kneib, C. Knobel, F. Lamareille, J. -F. Le Borgne, V. Le Brun, O. Le Fevre, E. Le Floc'h, A. Leauthaud, C. Maier, V. Mainieri, M. Mignoli, R. Pello, Y. Peng, E. Perez-Montero, E. Ricciardelli, M. Salvato, M. Scodeggio, N. Scoville, J. Silverman, J. Surace, M. Tanaka, L. Tasca, L. Tresse, D. Vergani, E. Zucca, U. Abbas, D. Bottini, P. Capak, A. Cappi, C. M. Carollo, P. Cassata, A. Cimatti, M. Fumana, O. Ilbert, J. Kartaltepe, D. Maccagni, C. Marinoni, H. McCracken, P. Memeo, B. Meneux, P. Oesch, C. Porciani, L. Pozzetti, A. Renzini, R. Scaramella, C. Scarlata. 2008-09-29. The close environment of 24 micron galaxies at 0.6<z<1.0 in the COSMOS field. https://doi.org/10.1088/0004-637x%2F691%2F1%2F91
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