Fig. 1

Selection of MASSIV 0.9 ≲ z ≲ 1.5 star-forming galaxies with secure redshift and measured [O ii]λ3727 emission line in the VVDS Wide (VVDS-14h and –22 h, IAB ≤ 22.5, small triangles) and Deep/Ultra-Deep VVDS-02h (IAB ≤ 24/24.75, small squares) fields for SINFONI follow-up observations. Among these galaxies we selected those showing a strong enough [O ii]λ3727 emission line for Hα to be easily detected in the NIR, and satisfying the OH and AO/LGS criteria (filled symbols, see text for details). The 63 galaxies selected for the MASSIV survey in the redshift range 0.9 ≲ z ≲ 1.5 are indicated as blue triangles (VVDS-14h and –22 h Wide fields), red squares (VVDS-02h Deep field), and green circles (VVDS-02h Ultra-Deep field). The distribution of [O ii]λ3727 equivalent width (EW) and flux are projected onto the x- and y-axes respectively. These histograms are normalized to the total number of objects. Empty-dot histograms are for the full VVDS Wide, Deep, and Ultra-Deep samples with measured [O ii]λ3727 emission line (N = 2397, median EW = −38 Å, median flux = 4.4 × 10-17 erg s-1 cm-2). Empty-solid histograms are for the VVDS Wide, Deep, and Ultra-Deep sample galaxies complying with the selection criteria ([O ii]λ3727 strength, OH sky lines and redshift range, see text for details, N = 728, median EW = −54 Å, median flux = 6.9 × 10-17 erg s-1 cm-2). Filled cyan histograms are for the selected MASSIV galaxies (N = 63, median EW = −61 Å, median flux = 8.3 × 10-17 erg s-1 cm-2). The dashed line indicates the selection box of MASSIV targets based on [O ii]λ3727 EW, flux and spectrum SNR (see text for details). The cross in the upper-left corner shows the typical error bars on [O ii]λ3727 flux and EW.
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