2017A&A...601A..95C

Query : 2017A&A...601A..95C

2017A&A...601A..95C - Astronomy and Astrophysics, volume 601A95-95 (2017/5-1)

Characterization of star-forming dwarf galaxies at 0.1 ≥z ≥ 0.9 in VUDS: probing the low-mass end of the mass-metallicity relation.

CALABRO A., AMORIN R., FONTANA A., PEREZ-MONTERO E., LEMAUX B.C., RIBEIRO B., BARDELLI S., CASTELLANO M., CONTINI T., DE BARROS S., GARILLI B., GRAZIAN A., GUAITA L., HATHI N.P., KOEKEMOER A.M., LE FEVRE O., MACCAGNI D., PENTERICCI L., SCHAERER D., TALIA M., TASCA L.A.M. and ZUCCA E.

Abstract (from CDS):

Context. The study of statistically significant samples of star-forming dwarf galaxies (SFDGs) at different cosmic epochs is essential for the detailed understanding of galaxy assembly and chemical evolution. However, the main properties of this large population of galaxies at intermediate redshift are still poorly known.
Aims. We present the discovery and spectrophotometric characterization of a large sample of 164 faint (iAB∼23-25mag) SFDGs at redshift 0.13≥z≥0.88 selected by the presence of bright optical emission lines in the VIMOS Ultra Deep Survey (VUDS). We investigate their integrated physical properties and ionization conditions, which are used to discuss the low-mass end of the mass-metallicity relation (MZR) and other key scaling relations.
Methods. We use optical VUDS spectra in the COSMOS, VVDS-02h, and ECDF-S fields, as well as deep multi-wavelength photometry that includes HST-ACS F814W imaging, to derive stellar masses, extinction-corrected star-formation rates (SFR), and gas-phase metallicities of SFDGs. For the latter, we use the direct method and a Te-consistent approach based on the comparison of a set of observed emission lines ratios with the predictions of detailed photoionization models.
Results. The VUDS SFDGs are compact (median re∼1.2kpc), low-mass (M*∼107-109M☉) galaxies with a wide range of star-formation rates (SFR(Hα)∼10–3-101M☉/yr) and morphologies. Overall, they show a broad range of subsolar metallicities (12+log(O/H)=7.26-8.7; 0.04≥Z/Z☉≥1). Nearly half of the sample are extreme emission-line galaxies (EELGs) characterized by high equivalent widths and emission line ratios indicative of higher excitation and ionization conditions. The MZR of SFDGs shows a flatter slope compared to previous studies of galaxies in the same mass range and redshift. We find the scatter of the MZR is partly explained in the low mass range by varying specific SFRs and gas fractions amongst the galaxies in our sample. In agreement with recent studies, we find the subclass of EELGs to be systematically offset to lower metallicity compared to SFDGs at a given stellar mass and SFR, suggesting a younger starburst phase. Compared with simple chemical evolution models we find that most SFDGs do not follow the predictions of a "closed-box" model, but those from a gas-regulating model in which gas flows are considered. While strong stellar feedback may produce large-scale outflows favoring the cessation of vigorous star formation and promoting the removal of metals, younger and more metal-poor dwarfs may have recently accreted large amounts of fresh, very metal-poor gas, that is used to fuel current star formation.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - galaxies: dwarf - galaxies: abundances - galaxies: starburst - galaxies: starburst

VizieR on-line data: <Available at CDS (J/A+A/601/A95): tableb1.dat tableb2.dat tableb3.dat>

Simbad objects: 170

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Number of rows : 170
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 VIDEO J022410.04-044301.82 G 02 24 10.052 -04 43 01.86           ~ 2 0
2 VIDEO J022410.52-044719.38 G 02 24 10.542 -04 47 19.34           ~ 2 0
3 VUDS 520212105 G 02 24 12.541 -04 36 46.73           ~ 1 0
4 VUDS 520110438 G 02 24 12.695 -04 47 49.37           ~ 1 0
5 VUDS 520109032 G 02 24 14.188 -04 47 58.40           ~ 1 0
6 VIDEO J022418.22-044117.19 G 02 24 18.236 -04 41 17.16           ~ 2 0
7 VIDEO J022418.67-044914.30 G 02 24 18.685 -04 49 14.30           ~ 2 0
8 VUDS 520158200 G 02 24 23.573 -04 42 33.15           ~ 1 0
9 VIDEO J022449.50-044305.49 G 02 24 49.499 -04 43 05.58           ~ 2 0
10 VUDS 520126446 G 02 24 56.910 -04 46 08.05           ~ 1 0
11 VUDS 520276545 EmG 02 25 09.248 -04 30 01.49         24.895 ~ 2 0
12 VUDS 520457241 G 02 25 11.414 -04 11 26.24           ~ 1 0
13 VUDS 520384077 G 02 25 12.060 -04 19 02.41           ~ 1 0
14 VIDEO J022513.00-043258.39 G 02 25 13.001 -04 32 58.15 25.087 24.673 24.047 23.715 23.674 ~ 7 0
15 VIDEO J022513.14-042156.62 G 02 25 13.151 -04 21 56.62           ~ 2 0
16 VUDS 520348106 G 02 25 13.178 -04 22 42.02           ~ 1 0
17 VIDEO J022518.96-043952.23 G 02 25 18.967 -04 39 52.32           ~ 2 0
18 VIDEO J022519.83-042934.05 EmG 02 25 19.841 -04 29 34.12         23.589 ~ 3 0
19 VUDS 520389031 G 02 25 21.552 -04 18 32.75           ~ 1 0
20 VUDS 520393656 G 02 25 24.158 -04 18 05.83           ~ 1 0
21 VUDS 520389512 G 02 25 25.058 -04 18 28.59           ~ 1 0
22 VUDS 520335690 G 02 25 26.187 -04 23 58.93           ~ 1 0
23 VIDEO J022526.21-044059.29 G 02 25 26.224 -04 40 59.42           ~ 2 0
24 VIDEO J022526.69-041855.66 G 02 25 26.696 -04 18 55.61           ~ 2 0
25 VUDS 520359163 G 02 25 31.449 -04 21 34.13           ~ 1 0
26 VUDS 520492610 G 02 25 32.242 -04 07 50.79           ~ 1 0
27 VIDEO J022532.42-041129.78 G 02 25 32.434 -04 11 29.83           ~ 2 0
28 VIDEO J022533.11-043906.69 G 02 25 33.124 -04 39 06.69           ~ 2 0
29 VUDS 520290391 EmG 02 25 33.706 -04 28 36.83         24.928 ~ 2 0
30 VIDEO J022534.65-041242.70 G 02 25 34.646 -04 12 42.78           ~ 2 0
31 VIDEO J022545.53-040931.54 G 02 25 45.587 -04 09 31.09           ~ 2 0
32 VUDS 520382889 G 02 25 47.456 -04 19 09.31           ~ 1 0
33 VIDEO J022548.29-043241.56 G 02 25 48.308 -04 32 41.59   24.853 24.530 23.762 23.745 ~ 6 0
34 VIDEO J022550.75-043724.21 G 02 25 50.759 -04 37 24.22           ~ 2 0
35 VUDS 520484945 G 02 25 54.062 -04 08 36.25           ~ 1 0
36 VUDS 520246239 EmG 02 25 56.554 -04 33 08.01         24.244 ~ 2 0
37 VUDS 520421644 G 02 25 58.394 -04 15 08.97           ~ 1 0
38 VUDS 520441846 G 02 26 02.311 -04 12 58.05           ~ 1 0
39 VUDS 520192120 G 02 26 03.459 -04 38 59.22           ~ 1 0
40 VUDS 520422694 G 02 26 06.411 -04 15 03.92           ~ 1 0
41 VUDS 520187005 G 02 26 07.736 -04 39 29.80           ~ 1 0
42 VUDS 520320742 G 02 26 08.825 -04 25 30.10           ~ 1 0
43 VIDEO J022609.49-043833.57 G 02 26 09.498 -04 38 33.23   24.743 24.263 23.845 23.635 ~ 7 0
44 VUDS 520213660 G 02 26 10.743 -04 36 35.87           ~ 1 0
45 VUDS 520197169 G 02 26 11.150 -04 38 23.36           ~ 1 0
46 VIDEO J022619.69-043613.92 G 02 26 19.700 -04 36 13.90   25.900 24.378 23.877 23.423 ~ 5 0
47 VIDEO J022619.86-041805.06 G 02 26 19.872 -04 18 04.97           ~ 2 0
48 VIDEO J022622.21-042451.74 EmG 02 26 22.225 -04 24 51.78         23.929 ~ 3 0
49 VIDEO J022624.57-043907.47 G 02 26 24.566 -04 39 07.55           ~ 2 0
50 VIDEO J022628.27-041837.84 EmG 02 26 28.284 -04 18 37.75         24.194 ~ 3 0
51 VUDS 520316869 G 02 26 30.084 -04 25 54.63           ~ 1 0
52 VUDS 520448494 G 02 26 32.006 -04 12 17.04           ~ 1 0
53 VIDEO J022632.06-041444.09 G 02 26 32.066 -04 14 44.16           ~ 2 0
54 VUDS 520420821 EmG 02 26 34.426 -04 15 16.54         23.537 ~ 2 0
55 VIDEO J022639.91-042234.89 EmG 02 26 39.926 -04 22 34.80         23.623 ~ 3 0
56 VIDEO J022651.34-043056.07 G 02 26 51.346 -04 30 56.01           ~ 2 0
57 VIDEO J022652.58-042151.78 G 02 26 52.593 -04 21 51.81           ~ 2 0
58 VUDS 520316717 EmG 02 26 52.599 -04 25 57.40         24.213 ~ 2 0
59 VIDEO J022653.43-043611.25 G 02 26 53.433 -04 36 11.23           ~ 4 0
60 VUDS 520357690 G 02 26 58.170 -04 21 45.45           ~ 1 0
61 VIDEO J022706.50-041346.61 G 02 27 06.496 -04 13 46.66   24.132 23.808 23.522 23.217 ~ 6 0
62 VUDS 520433508 EmG 02 27 07.877 -04 13 51.39         24.777 ~ 2 0
63 VUDS 520344687 EmG 02 27 15.165 -04 23 03.16         24.974 ~ 2 0
64 VUDS 530076899 EmG 03 31 55.468 -27 35 02.27         25.388 ~ 2 0
65 ZFOURGE CDFS 10501 G 03 32 04.63978 -27 50 34.4310   24.662   24.005   ~ 3 0
66 VUDS 530035383 G 03 32 06.9406 -27 50 16.729           ~ 5 0
67 EIS-DEEP CDFS-1 Ks 1 684 G 03 32 07.71281 -27 47 06.3859   22.017 22.168 22.718   ~ 14 0
68 GOODS J033209.19-274949.5 G 03 32 09.18794 -27 49 49.5235   25.83   25.089   ~ 6 0
69 VUDS 530034174 G 03 32 10.7208 -27 50 47.065           ~ 6 0
70 GOODS J033211.57-274011.6 G 03 32 11.57431 -27 40 11.5939   25.26   24.715   ~ 2 0
71 VUDS 530076254 EmG 03 32 13.640 -27 35 17.58         24.545 ~ 2 0
72 VUDS 530080539 EmG 03 32 15.087 -27 33 39.18         24.426 ~ 2 0
73 PEARS s112157 EmG 03 32 15.829 -27 43 51.30   24.61 23.94   24.330 ~ 8 0
74 VUDS 530040953 G 03 32 19.0164 -27 48 11.018           ~ 6 0
75 VUDS 530072729 G 03 32 19.703 -27 36 40.71           ~ 1 0
76 MUSE-WIDE 142019111 EmG 03 32 20.499 -27 46 21.05         24.577 ~ 8 0
77 VUDS 530044132 G 03 32 20.50415 -27 47 03.7198           ~ 2 0
78 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
79 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
80 GOODS-MUSIC 13924 EmG 03 32 31.754 -27 44 12.02   25.46 24.62 24.318 24.153 ~ 8 0
81 GOODS J033234.93-274443.0 EmG 03 32 34.92533 -27 44 42.9666   24.226   24.661   ~ 8 0
82 VUDS 530029947 G 03 32 39.89685 -27 52 18.3957           ~ 5 0
83 VUDS 530074742 G 03 32 41.008 -27 35 57.64           ~ 1 0
84 VUDS 530054477 G 03 32 43.3228 -27 43 22.641           ~ 5 0
85 VUDS 530016928 G 03 32 45.324 -27 57 16.83           ~ 1 0
86 GOODS J033248.23-274827.2 EmG 03 32 48.22872 -27 48 27.2412   24.432   24.648 23.90 ~ 9 0
87 MUSE-WIDE 121023062 EmG 03 32 52.0139 -27 49 53.438           ~ 7 0
88 VUDS 530043711 EmG 03 32 59.018 -27 47 10.57         24.136 ~ 2 0
89 ZFOURGE CDFS 14585 G 03 33 00.89455 -27 48 38.3879   25.78   24.93   ~ 3 0
90 VUDS 530079125 EmG 03 33 01.563 -27 34 09.70         25.204 ~ 2 0
91 VUDS 530021782 G 03 33 03.294 -27 55 28.28           ~ 1 0
92 VUDS 530046457 G 03 33 04.403 -27 46 12.81           ~ 1 0
93 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 110 1
94 SBSG 0335-052 AGN 03 37 44.06 -05 02 40.2     16.65     ~ 500 1
95 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
96 COSMOS2015 635385 G 09 58 34.02 +02 15 54.8 25.71 25.57 24.74 24.50 24.04 ~ 2 0
97 COSMOS2015 381991 G 09 58 38.78 +01 52 22.4 26.16 25.76 25.33 25.28 25.22 ~ 2 0
98 COSMOS2015 311998 G 09 58 39.28 +01 45 46.9 27.00 26.473 26.110 25.37 24.97 ~ 2 0
99 COSMOS2015 696384 G 09 58 40.60 +02 21 23.2   25.615 25.780     ~ 1 0
100 COSMOS2015 326944 G 09 58 44.10 +01 47 10.5 25.11 24.80 24.38 24.47 24.36 ~ 2 0
101 COSMOS2015 369785 G 09 58 45.40 +01 51 13.4 25.48 25.27 25.07 24.60 24.16 ~ 4 0
102 COSMOS2015 584855 G 09 58 46.40 +02 11 22.0 25.24 25.13 24.54 24.29 23.77 ~ 4 0
103 COSMOS2015 655120 G 09 58 46.89 +02 17 41.2 25.10 25.04 24.63 24.38 23.90 ~ 4 0
104 VUDS 5101315451 G 09 58 52.140 +02 19 19.51           ~ 1 0
105 VUDS 5100846915 G 09 58 52.826 +02 05 05.54           ~ 1 0
106 COSMOS2015 560902 G 09 58 56.09 +02 09 14.7 25.41 25.44 24.90 24.68 24.33 ~ 2 0
107 VUDS 510830468 EmG 09 59 09.269 +02 01 52.50         24.302 ~ 2 0
108 COSMOS2015 453857 EmG 09 59 09.658 +01 59 17.71         24.995 ~ 2 0
109 COSMOS2015 315778 G 09 59 24.44 +01 45 50.1 25.35 25.80 25.997 25.41 24.91 ~ 2 0
110 COSMOS2015 326770 G 09 59 30.62 +01 47 11.7 25.22 25.32 25.18 25.08 24.56 ~ 2 0
111 COSMOS2015 540805 G 09 59 38.58 +02 07 25.2 24.46 24.41 23.91 23.48 23.13 ~ 4 0
112 COSMOS2015 833858 EmG 09 59 43.09 +02 33 56.9   25.566 25.593   24.336 ~ 2 0
113 COSMOS2015 855991 G 09 59 43.90 +02 35 56.9 25.83 25.23 24.50 24.47 24.30 ~ 5 0
114 COSMOS2015 501672 G 09 59 49.44 +02 03 50.0 25.88 25.90 25.55 25.37 24.56 ~ 2 0
115 COSMOS2015 461746 EmG 09 59 52.20 +02 00 03.8   25.410 25.339   24.449 ~ 2 0
116 COSMOS2015 323940 G 09 59 55.95 +01 46 55.5 26.61 25.99 25.12 24.95 24.83 ~ 2 0
117 COSMOS2015 722676 G 09 59 56.83 +02 23 44.4     24.968     ~ 1 0
118 COSMOS2015 327195 EmG 09 59 59.59 +01 47 12.6 25.26 25.19 24.87 24.73 23.84 ~ 4 0
119 COSMOS2015 549472 EmG 10 00 11.84 +02 08 15.8 25.77 25.55 25.04 24.92 24.95 ~ 3 0
120 CANDELS COSMOS F160W J100015.46+021412.0 G 10 00 15.46 +02 14 12.1 22.895 22.38 21.598 21.519 21.310 ~ 13 0
121 COSMOS 1605450 EmG 10 00 20.21 +02 15 58.8 25.95 25.55 25.03 24.70 24.50 ~ 9 0
122 COSMOS2015 312682 G 10 00 20.97 +01 45 49.9 25.37 25.59 24.88 24.56 24.43 ~ 2 0
123 VUDS 510175664 EmG 10 00 27.136 +02 02 34.63         24.976 ~ 2 0
124 COSMOS2015 364432 G 10 00 27.31 +01 50 40.0 24.84 24.73 24.27 23.86 23.53 ~ 4 0
125 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
126 COSMOS2015 476128 G 10 00 30.20 +02 01 25.0   25.270 25.230     ~ 1 0
127 COSMOS2015 317676 G 10 00 31.28 +01 46 19.6 26.38 25.62 25.04 24.83 24.64 ~ 2 0
128 VUDS 510771377 G 10 00 33.535 +02 05 20.67           ~ 1 0
129 COSMOS2015 669830 EmG 10 00 35.77 +02 19 00.5 24.026 23.90 23.16 22.93 22.89 ~ 13 0
130 COSMOS2015 479437 G 10 00 38.36 +02 01 45.0 25.77 25.74 25.30 24.91 24.47 ~ 2 0
131 COSMOS 2336860 G 10 00 39.36 +02 32 28.8   24.910 25.030     ~ 3 0
132 COSMOS2015 539195 G 10 00 39.413 +02 07 21.21           ~ 1 0
133 COSMOS 1985413 G 10 00 41.22 +02 21 25.8 25.63 25.44 24.79 24.54 24.40 ~ 5 0
134 COSMOS2015 337871 EmG 10 00 42.67 +01 48 11.2 26.57 26.43 25.40 25.14 25.08 ~ 3 0
135 COSMOS2015 572357 G 10 00 43.906 +02 10 12.55           ~ 1 0
136 COSMOS 2354005 G 10 00 45.14 +02 27 56.0 25.23 25.25 24.49 24.37 24.28 ~ 5 0
137 COSMOS2015 887156 G 10 00 46.39 +02 38 48.7 25.66 25.84 25.00 24.80 24.56 ~ 4 0
138 COSMOS2015 889381 G 10 00 46.85 +02 39 00.1   24.717       ~ 2 0
139 COSMOS2015 691993 G 10 00 52.37 +02 20 58.2 25.10 25.16 25.08 24.66 24.23 ~ 5 0
140 COSMOS2015 433865 G 10 00 53.74 +01 57 20.4 26.49 26.414 26.035 25.73 25.07 ~ 2 0
141 COSMOS2015 457477 G 10 00 53.79 +01 59 38.5 26.23 26.14 25.73 25.46 24.88 ~ 2 0
142 COSMOS2015 669679 G 10 00 54.66 +02 19 01.8 24.97 25.02 24.80 24.70 24.31 ~ 3 0
143 COSMOS2015 463404 G 10 00 57.29 +02 00 13.9 23.92 24.02 23.81 23.79 23.38 ~ 4 0
144 COSMOS2015 563932 G 10 00 58.30 +02 09 33.3 25.94 26.09 25.949 25.65 24.87 ~ 2 0
145 VUDS 5101661320 G 10 00 58.303 +02 37 56.71           ~ 1 0
146 COSMOS2015 538417 G 10 00 58.42 +02 07 15.5 25.73 25.64 24.96 24.74 24.35 ~ 4 0
147 COSMOS2015 331827 G 10 01 00.139 +01 47 38.46           ~ 1 0
148 COSMOS2015 469680 G 10 01 11.09 +02 00 46.9 25.05 24.99 24.80 24.36 23.93 ~ 4 0
149 COSMOS2015 479204 G 10 01 12.924 +02 01 44.46           ~ 1 0
150 COSMOS2015 648626 G 10 01 14.04 +02 17 07.9   25.216 25.437     ~ 1 0
151 COSMOS2015 648414 G 10 01 14.167 +02 17 07.99           ~ 1 0
152 COSMOS2015 526111 G 10 01 16.27 +02 06 04.4 25.79 25.53 25.29 24.86 24.34 ~ 4 0
153 COSMOS 1587741 G 10 01 16.70 +02 10 30.6 26.16 26.20 25.41 25.15 24.84 ~ 2 0
154 COSMOS2015 425868 G 10 01 17.86 +01 56 33.7 26.16 25.74 25.25 25.04 24.75 ~ 2 0
155 COSMOS2015 887622 EmG 10 01 18.49 +02 38 50.4 25.51 25.34 25.05 24.61 24.03 ~ 5 0
156 COSMOS2015 538201 G 10 01 18.97 +02 07 15.2 26.04 25.77 25.40 25.12 24.72 ~ 2 0
157 VUDS 5100538393 G 10 01 19.003 +01 50 08.26           ~ 1 0
158 COSMOS2015 384152 G 10 01 20.28 +01 52 32.7 24.74 24.67 24.08 23.87 23.88 ~ 2 0
159 COSMOS2015 769245 G 10 01 21.274 +02 28 03.57           ~ 1 0
160 COSMOS2015 581449 G 10 01 23.47 +02 11 06.6   25.610 25.527     ~ 1 0
161 COSMOS2015 571269 G 10 01 24.403 +02 10 12.14           ~ 1 0
162 COSMOS2015 490918 G 10 01 24.876 +02 02 49.08           ~ 1 0
163 COSMOS2015 310860 G 10 01 25.850 +01 45 40.80           ~ 1 0
164 COSMOS2015 582443 G 10 01 29.20 +02 11 11.6 24.99 25.03 24.60 24.39 23.96 ~ 2 0
165 VUDS 5101423260 G 10 01 30.665 +02 36 46.47           ~ 1 0
166 COSMOS2015 895846 EmG 10 01 33.12 +02 39 38.7 25.44 25.30 24.85 24.59 24.27 ~ 5 0
167 COSMOS2015 673905 G 10 01 33.281 +02 19 20.21 23.509 23.31 22.45 22.27 22.105 ~ 7 0
168 COSMOS2015 729956 G 10 01 35.70 +02 24 23.3 24.80 24.70 23.97 23.85 23.62 ~ 5 0
169 COSMOS2015 679911 G 10 01 37.29 +02 19 55.8 24.92 25.01 24.83 24.68 23.89 ~ 2 0
170 COSMOS2015 470577 G 10 01 37.38 +02 00 51.7 26.27 25.94 25.60 25.06 24.42 ~ 2 0

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