The Optical Spectra of 24 μm Galaxies in the COSMOS Field. I. Spitzer MIPS Bright Sources in the zCOSMOS‐Bright 10k Catalog
2008; IOP Publishing; Volume: 680; Issue: 2 Linguagem: Inglês
10.1086/588038
ISSN1538-4357
AutoresK. I. Caputi, S. J. Lilly, H. Aussel, D. B. Sanders, D. Frayer, O. Le Fèvre, A. Renzini, G. Zamorani, M. Scodeggio, T. Contini, N. Scoville, C. M. Carollo, G. Hasinger, A. Iovino, V. Le Brun, E. Le Floc’h, C. Maier, V. Mainieri, M. Mignoli, M. Salvato, D. Schiminovich, J. D. Silverman, J. Surace, L. Tasca, U. Abbas, S. Bardelli, M. Bolzonella, A. Bongiorno, D. Bottini, P. Capak, A. Cappi, P. Cassata, A. Cimatti, O. Cucciati, S. de la Torre, L. de Ravel, P. Franzetti, M. Fumana, B. Garilli, C. Halliday, O. Ilbert, P. Kampczyk, Jeyhan S. Kartaltepe, Jean‐Paul Kneib, C. Knobel, K. Kovač, F. Lamareille, Alexie Leauthaud, J. F. Le Borgne, D. Maccagni, C. Marinoni, H. J. McCracken, B. Meneux, Pascal A. Oesch, R. Pelló, E. Pérez‐Montero, C. Porciani, E. Ricciardelli, R. Scaramella, Claudia Scarlata, L. Tresse, D. Vergani, Jakob Walcher, Michel Zamojski, E. Zucca,
Tópico(s)Astronomy and Astrophysical Research
ResumoWe study zCOSMOS-bright optical spectra for 609 Spitzer/MIPS 24 micron-selected galaxies with S(24um)> 0.30 mJy and I<22.5 (AB mag) over 1.5 sq. deg. of the COSMOS field. From emission-line diagnostics we find that: 1) star-formation rates (SFR) derived from the observed Halpha and Hbeta lines underestimate, on average, the total SFR by factors ~5 and 10, respectively; 2) both the Calzetti et al. and the Milky Way reddening laws are suitable to describe the extinction observed in infrared (IR) sources in most cases; 3) some IR galaxies at z<0.3 have low abundances, but many others with similar IR luminosities and redshifts are chemically enriched; 4) The average [OIII]/Hbeta ratios of nuLnu(24um)>10^11 Lsun galaxies at 0.6
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