We present the first measurement of the galaxy luminosity function (LF) at 1500 Angstrom in the range 0.2 less than or equal to z less than or equal to 1.2 based on Galaxy Evolution Explorer VIMOS-VLT Deep Survey observations (similar to1000 spectroscopic redshifts for galaxies with NUV less than or equal to 24.5) and at higher z using existing data sets. Our main results are summarized as follows: (1) Luminosity evolution is observed with DeltaM(*) similar to -2.0 mag between z = 0 and z = 1 and DeltaM(*) similar to -1.0 mag between z = 1 and z = 3. This confirms that the star formation activity was significantly higher in the past. (2) The LF slopes vary in the range -1.2 greater than or equal to alpha greater than or equal to -1.65, with a marginally significant hint of increase at higher z. (3) We split the sample in three rest-frame (B-I) intervals, providing an approximate spectral type classification: Sb - Sd, Sd - Irr, and unobscured starbursts. We find that the bluest class evolves less strongly in luminosity than the two other classes. On the other hand, their number density increases sharply with z (similar to 15% in the local universe to similar to55% at z similar to1), while that of the reddest classes decreases.
The GALEX VIMOS-VLT Deep Survey measurement of the evolution of the 1500 luminosity function / S. Arnouts, D. Schiminovich, O. Ilbert, L. Tresse, B. Milliard, M. Treyer, S. Bardelli, T. Budavari, T.K. Wyder, E. Zucca, O. Le Fèvre, D.C. Martin, G. Vettolani, C. Adami, M. Arnaboldi, T. Barlow, L. Bianchi, M. Bolzonella, D. Bottini, Y.-. Byun, A. Cappi, S. Charlot, T. Contini, J. Donas, K. Forster, S. Foucaud, P. Franzetti, P.G. Friedman, B. Garilli, I. Gavignaud, L. Guzzo, T.M. Heckman, C. Hoopes, A. Iovino, P. Jelinsky, V. Le Brun, Y.-. Lee, D. Maccagni, B.F. Madore, R. Malina, B. Marano, C. Marinoni, H.J. Mccracken, A. Mazure, B. Meneux, R. Merighi, P. Morrissey, S. Neff, S. Paltani, R. Pellò, J.P. Picat, A. Pollo, L. Pozzetti, M. Radovich, R.M. Rich, R. Scaramella, M. Scodeggio, M. Seibert, O. Siegmund, T. Small, A.S. Szalay, B. Welsh, C.K. Xu, G. Zamorani, A. Zanichelli. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 619:1(2005), pp. L43-L46.
The GALEX VIMOS-VLT Deep Survey measurement of the evolution of the 1500 luminosity function
L. Guzzo;
2005
Abstract
We present the first measurement of the galaxy luminosity function (LF) at 1500 Angstrom in the range 0.2 less than or equal to z less than or equal to 1.2 based on Galaxy Evolution Explorer VIMOS-VLT Deep Survey observations (similar to1000 spectroscopic redshifts for galaxies with NUV less than or equal to 24.5) and at higher z using existing data sets. Our main results are summarized as follows: (1) Luminosity evolution is observed with DeltaM(*) similar to -2.0 mag between z = 0 and z = 1 and DeltaM(*) similar to -1.0 mag between z = 1 and z = 3. This confirms that the star formation activity was significantly higher in the past. (2) The LF slopes vary in the range -1.2 greater than or equal to alpha greater than or equal to -1.65, with a marginally significant hint of increase at higher z. (3) We split the sample in three rest-frame (B-I) intervals, providing an approximate spectral type classification: Sb - Sd, Sd - Irr, and unobscured starbursts. We find that the bluest class evolves less strongly in luminosity than the two other classes. On the other hand, their number density increases sharply with z (similar to 15% in the local universe to similar to55% at z similar to1), while that of the reddest classes decreases.
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