Table 1
Characteristics of the sub-sample stacks
| Sub-sample | N | z sys median | R median | SF R median | ΣSFR median | M ∗ median | Δv(SiII) | EW(SiII) | EW(CIII]) | EW(Lyα) | Ext(Lyα–C) | Lyα peak shift |
| property | AB | M⊙ yr-1 | M⊙ yr-1 kpc-2 | 1E+9 M⊙ | km s-1 | Å | Å | Å | kpc | km s-1 | ||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) |
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| R ≥ 24.5 | 38 | 2.9 | 24.7 ± 0.1 | 11.0 ± 3.3 | 4.4 ± 1.1 | 2.8 ± 2.4 | –280 ± 100 | –1.6 ± 0.5 | 13.3 ± 1.8 | 58.4 ± 9.0 | 5.3 ± 0.6 | 173 ± 62 |
| R < 24.5 | 38 | 2.5 | 24.0 ± 0.1 | 28.8 ± 8.6 | 2.8 ± 1.7 | 3.1 ± 2.5 | –20 ± 80 | –0.9 ± 0.3 | 6.2 ± 0.9 | 22.7 ± 3.8 | 6.0 ± 0.6 | 428 ± 110 |
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| EW(Lyα) ≥ 27 Å | 38 | 2.7 | 24.6 ± 0.1 | 14.0 ± 4.6 | 4.5 ± 1.5 | 3.1 ± 3.1 | –360 ± 130 | –1.2 ± 0.4 | 11.8 ± 2.2 | 71.3 ± 10.0 | 5.3 ± 0.4 | 196 ± 60 |
| EW(Lyα) < 27 Å | 38 | 2.6 | 24.3 ± 0.1 | 19.5 ± 8.7 | 2.9 ± 0.5 | 2.8 ± 1.6 | –30 ± 60 | –1.6 ± 0.6 | 7.6 ± 1.0 | 9.7 ± 1.3 | 6.4 ± 0.6 | 510 ± 98 |
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| EW(CIII]) ≥ 7.9 Å | 38 | 2.9 | 24.7 ± 0.1 | 12.7 ± 8.3 | 4.1 ± 1.1 | 3.0 ± 3.3 | –430 ± 180 | –1.2 ± 0.7 | 15.2 ± 2.0 | 58.2 ± 11.6 | 4.8 ± 0.5 | 207 ± 80 |
| EW(CIII]) < 7.9 Å | 38 | 2.5 | 24.2 ± 0.1 | 20.1 ± 5.6 | 3.3 ± 1.6 | 2.7 ± 0.8 | –30 ± 50 | –1.8 ± 0.3 | 4.6 ± 0.2 | 22.0 ± 4.3 | 6.3 ± 0.5 | 307 ± 58 |
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| CUV ≥ 2.4 | 17 | 2.7 | 24.7 ± 0.1 | 11.7 ± 3.4 | 4.1 ± 1.2 | 2.9 ± 2.1 | –470 ± 200 | –2.1 ± 1.3 | 13.3 ± 3.6 | 94.2 ± 18.3 | 4.7 ± 0.9 | 93 ± 72 |
| CUV< 2.4 | 17 | 2.7 | 24.5 ± 0.1 | 20.5 ± 4.0 | 3.0 ± 1.5 | 2.9 ± 2.4 | –80 ± 120 | –2.0 ± 0.5 | 9.1 ± 1.8 | 16.0 ± 4.2 | 4.1 ± 1.4 | 325 ± 140 |
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| Over | 50 | 2.7 | 24.5 ± 0.1 | 17.5 ± 4.9 | 3.7 ± 1.4 | 3.2 ± 1.8 | –70 ± 60 | –1.1 ± 0.3 | 8.8 ± 1.0 | 32.3 ± 5.8 | 5.7 ± 0.5 | 284 ± 76 |
| Under | 26 | 2.6 | 24.4 ± 0.1 | 17.6 ± 11.2 | 3.5 ± 0.6 | 2.7 ± 3.7 | –400 ± 170 | –1.8 ± 0.8 | 11.5 ± 3.0 | 58.4 ± 13.8 | 5.0 ± 0.8 | 160 ± 85 |
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| M∗ ≥ 2.9E+9 M⊙ | 38 | 3.0 | 24.3 ± 0.1 | 21.9 ± 9.0 | 4.3 ± 1.6 | 5.9 ± 3.1 | –270 ± 120 | –1.2 ± 0.3 | 11.0 ± 2.0 | 38.7 ± 9.5 | 5.0 ± 0.6 | 137 ± 59 |
| M∗< 2.9E+9 M⊙ | 38 | 2.6 | 24.5 ± 0.1 | 14.7 ± 3.3 | 3.1 ± 0.9 | 1.9 ± 0.2 | –63 ± 110 | –1.4 ± 0.5 | 8.0 ± 0.8 | 41.0 ± 7.6 | 5.8 ± 0.5 | 322 ± 69 |
Notes. The columns correspond to: (1) the properties that define the sub-samples: R magnitude, Lyα and CIII]1909 equivalent widths, rest-frame UV concentration, field density, and stellar mass of the galaxies in our sample; (2) the number of sources in each sub-sample. Some of the sources in the sub-samples selected based on different properties overlap. The concentration is estimated only when we have HST coverage; for the sources in each sub-sample we report (3) the median systemic redshift; (4) the median R-band magnitude; (5) the median star-formation rate, obtained from the SED fitting; (6) the median star formation rate density calculated from the SFR and from the PSF-corrected half-light-radius measured in the HST I broad-band images (ΣSFR =SFR/2 π r
); and (7) the median stellar mass also obtained from the SED fitting. We report the error bars on the median values. It is up to 0.1 for R, of the order of 5 for SFR, 0.5–1.7 for ΣSFR, 0.2–3.7 for M∗. Then, we show six quantities calculated in the stacks of the sub-samples: (8) the velocity offset between CIII] and SiII1526; (9) the rest-frame equivalent width of the SiII1526 absorption line; (10) the rest-frame equivalent width of CIII]1908; (11) the rest-frame equivalent width of Lyα; (12) the 2D Lyα spatial extension; (13) the Lyα peak shift.
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