2018A&A...615A..61C


Query : 2018A&A...615A..61C

2018A&A...615A..61C - Astronomy and Astrophysics, volume 615A, 61-61 (2018/7-1)

Identification of galaxies that experienced a recent major drop of star formation.

CIESLA L., ELBAZ D., SCHREIBER C., DADDI E. and WANG T.

Abstract (from CDS):

Variations of star formation activity may happen on a large range of timescales and some of them are expected to be short, that is, a few hundred million years. The study of the physical processes linked to these rapid variations requires large statistical samples to pinpoint galaxies undergoing such transformations. Building upon a previous study, we define a method to blindly identify galaxies that have undergone, and may still be undergoing, a fast downfall of their star formation activity, that is, a more than 80% drop in star formation rate (SFR) occurring in less than 500Myr. Modeling galaxies' spectral energy distribution (SED) with a delayed-τ star formation history, with and without allowing an instantaneous SFR drop within the last hundred million years, we isolate 102 candidates out of a subsample of 6680 galaxies classified as "star forming" from the UVJ criterion in the ZFOURGE catalogs. These galaxies are mostly located in the lower part of the SFR-M* main sequence (MS) and extend up to a factor 100 below it. They also lie close to the limit between the passive and active regions on the UVJ diagram, indicating that they are in a transition phase. We show that the selected candidates have different physical properties compared to galaxies with similar UVJ colors, namely, lower SFRs and different stellar masses. The morphology of the candidates shows no preference for a particular type. Among the 102 candidates, only 4 show signs of a active galactic nucleus (AGN) activity (from X-ray luminosity or ultraviolet-infrared (UV-IR) SED fitting decomposition). This low fraction of AGNs among the candidates implies that AGN activity may not be the main driver of the recent downfall, although timescale differences and duty cycle must be taken into account. We finally attempt to recover the past position of these galaxies on the SFR-M* plane, before the downfall of their star formation and show that some of them were in the starburst region before, and are now back on the MS. These candidates constitute a promising sample that needs more investigation in order to understand the different mechanisms at the origin of the star formation decrease of the Universe since z∼2.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: evolution - galaxies: fundamental parameters - galaxies: star formation

Simbad objects: 104

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Number of rows : 104
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GOODS J033157.78-274142.1 G 03 31 57.800 -27 41 41.86           ~ 4 0
2 GOODS J033203.26-274312.7 G 03 32 03.256 -27 43 12.66   26.92 26.81     ~ 6 0
3 GOODS-MUSIC 14234 G 03 32 03.797 -27 43 56.15   25.3630     23.9540 ~ 11 0
4 VCDFS 31056 G 03 32 04.597 -27 43 57.60   24.2435   22.980 21.796 ~ 12 0
5 ZFOURGE CDFS 26818 G 03 32 05.676 -27 42 31.79   23.734   24.814 22.276 ~ 10 0
6 ZFOURGE CDFS 21751 G 03 32 06.282 -27 45 08.40   24.61 24.37     ~ 6 0
7 EIS-DEEP CDFS-3 J 1 1194 G 03 32 08.073 -27 51 08.22       23.288   ~ 5 0
8 [SWM2014] GOODS-S 33184 G 03 32 09.773 -27 45 29.35   24.2791 23.30 22.622 22.480 ~ 19 0
9 ZFOURGE CDFS 18732 EmG 03 32 10.4443 -27 46 36.007   25.15     23.57 ~ 5 0
10 ZFOURGE CDFS 22772 G 03 32 12.473 -27 44 37.98   25.32 24.46 23.955 23.063 ~ 8 0
11 ZFOURGE CDFS 26681 G 03 32 13.2925 -27 42 36.340           ~ 4 0
12 GOODS-MUSIC 3006 G 03 32 13.3782 -27 53 07.101       23.333 23.1722 ~ 9 0
13 ZFOURGE CDFS 26391 G 03 32 13.575 -27 42 40.14   26.33 26.16     ~ 5 0
14 ZFOURGE CDFS 12351 G 03 32 13.67 -27 49 34.4       22.30   ~ 9 0
15 GOODS J033213.70-274142.1 G 03 32 13.698 -27 41 42.02   26.41 25.88     ~ 5 0
16 MUSE-WIDE 101014030 EmG 03 32 14.66858 -27 48 15.5361   25.62     23.85 ~ 6 0
17 VANDELS CDFS 211307 G 03 32 15.3690 -27 53 57.444           ~ 3 0
18 ZFOURGE CDFS 22002 G 03 32 15.385 -27 45 01.57   24.8164 24.66   24.3698 ~ 8 0
19 ZFOURGE CDFS 25712 G 03 32 15.4440 -27 43 03.641           ~ 1 0
20 CANDELS UDS F160W J033215.60-274200.0 G 03 32 15.600 -27 42 00.05   27.67 26.33     ~ 5 0
21 EIS-DEEP CDFS-3 J 1 671 G 03 32 15.973 -27 49 43.35   24.840 22.475 20.969 20.83 ~ 14 0
22 GOODS-MUSIC 16698 G 03 32 16.137 -27 41 54.42   26.38 26.32     ~ 4 0
23 ZFOURGE CDFS 12474 EmG 03 32 16.53607 -27 49 34.4413   22.950 23.142 23.791 22.23 ~ 14 0
24 EIS-DEEP CDFS-1 J 1 306 G 03 32 16.696 -27 44 39.96   25.1325 24.53 24.677 23.5065 ~ 13 0
25 ZFOURGE CDFS 12916 EmG 03 32 17.1350 -27 49 24.997   25.94     23.84 ~ 6 0
26 GOODS-MUSIC 15983 G 03 32 17.221 -27 42 30.42   24.1402 23.61 23.055 22.495 ~ 13 0
27 ZFOURGE CDFS 7277 G 03 32 18.5715 -27 52 12.861           ~ 5 0
28 EIS-DEEP CDFS-1 J 1 839 AGN 03 32 18.750 -27 46 26.90   27.233 26.405 23.83 23.36 ~ 21 0
29 ZFOURGE CDFS 18117 G 03 32 19.600 -27 46 52.87   25.70     23.57 ~ 10 0
30 ZFOURGE CDFS 25774 G 03 32 19.613 -27 43 06.21   25.13 24.64     ~ 5 0
31 ZFOURGE CDFS 15434 EmG 03 32 19.69025 -27 48 09.6309           ~ 4 0
32 VCDFS 19873 EmG 03 32 20.0178 -27 51 52.793   25.3415   23.818 23.5051 ~ 13 0
33 VCDFS 64465 G 03 32 20.1122 -27 54 04.077   25.884   24.227 23.7367 ~ 9 0
34 GOODS J033220.47-275707.1 G 03 32 20.46605 -27 57 07.0502           ~ 3 0
35 ZFOURGE CDFS 27575 G 03 32 20.585 -27 42 02.78   25.6559     25.0871 ~ 10 0
36 EIS-DEEP CDFS-1 J 1 443 G 03 32 21.144 -27 45 10.81   24.77 23.86 23.407 22.926 ~ 7 0
37 [LBX2017] 384 AGN 03 32 21.39658 -27 55 49.2398   25.5307   24.301 24.5990 ~ 27 0
38 ZFOURGE CDFS 8836 G 03 32 21.9946 -27 51 27.110           ~ 3 0
39 ZFOURGE CDFS 24908 EmG 03 32 22.953 -27 43 33.11   25.75 24.46 23.919 23.183 ~ 9 0
40 ZFOURGE CDFS 19516 G 03 32 23.4996 -27 46 12.172   25.5641     24.1928 ~ 11 0
41 GOODS J033224.04-275610.7 G 03 32 24.06372 -27 56 11.2578   23.532   23.448   ~ 6 0
42 EIS-DEEP CDFS-1 Ks 1 733 G 03 32 25.0404 -27 47 18.198   25.2814     24.4143 ~ 15 0
43 CXOCDFS J033225.2-275044 Sy2 03 32 25.1059 -27 50 43.256   24.8238   24.08 22.938 ~ 37 0
44 EIS-DEEP CDFS-2 Ks 1 1004 EmG 03 32 25.2602 -27 45 23.968   22.8017   21.731 21.4025 ~ 28 0
45 ZFOURGE CDFS 28584 G 03 32 25.275 -27 41 29.58   24.84 23.84 23.239 22.705 ~ 6 0
46 ZFOURGE CDFS 23364 G 03 32 25.760 -27 44 20.35   24.976 25.03 24.608 23.908 ~ 7 0
47 ZFOURGE CDFS 28348 G 03 32 26.080 -27 41 38.49           ~ 4 0
48 ZFOURGE CDFS 20878 G 03 32 26.2216 -27 45 33.625           ~ 4 0
49 ZFOURGE CDFS 29927 G 03 32 27.6096 -27 40 25.884           ~ 1 0
50 GOODS-MUSIC 12877 G 03 32 27.6612 -27 45 05.713   25.2720     24.1803 ~ 14 0
51 GOODS-MUSIC 16763 G 03 32 28.383 -27 41 49.93   25.51 25.11     ~ 7 0
52 ZFOURGE CDFS 22204 G 03 32 28.42 -27 44 53.3           ~ 6 0
53 ZFOURGE CDFS 1727 G 03 32 28.46028 -27 55 54.2330   24.775   25.578 23.9279 ~ 10 0
54 ZFOURGE CDFS 26509 G 03 32 29.481 -27 42 40.33   26.24 25.96     ~ 5 0
55 [SBH2004] 11210 G 03 32 29.8178 -27 53 40.944       23.77   ~ 5 0
56 GNS 7497 EmG 03 32 29.9427 -27 50 32.023   25.4656     24.8331 ~ 11 0
57 ZFOURGE CDFS 21086 G 03 32 30.037 -27 45 26.51   25.831 25.431     ~ 7 0
58 GMASS 2540 G 03 32 30.343 -27 42 40.38   23.406 23.22 23.234 23.0087 ~ 20 0
59 GOODS J033230.59-275631.8 G 03 32 30.5889 -27 56 31.826   25.0325     24.1020 ~ 6 0
60 ZFOURGE CDFS 18295 G 03 32 30.8308 -27 46 48.573   24.9205 24.726 23.61 24.0561 ~ 13 0
61 ZFOURGE CDFS 20619 G 03 32 31.2204 -27 45 43.107           ~ 4 0
62 ZFOURGE CDFS 29433 G 03 32 31.221 -27 40 52.15   24.4901     23.4677 ~ 11 0
63 UDF 6399 G 03 32 31.611 -27 47 08.02 27.8445 26.9799 26.4745     ~ 7 0
64 ZFOURGE CDFS 4895 G 03 32 31.6358 -27 53 36.888   25.8401     24.1469 ~ 7 0
65 GEMS J033232.07-274119.5 G 03 32 32.073 -27 41 19.52   24.2051   23.484 23.1113 ~ 13 0
66 ZFOURGE CDFS 10317 G 03 32 32.327 -27 50 37.28           ~ 5 0
67 EIS-DEEP CDFS-4 J 1 2607 G 03 32 32.50711 -27 51 40.8668   20.723   23.095 23.2653 ~ 10 0
68 EIS-DEEP CDFS-2 J 1 281 EmG 03 32 32.760 -27 44 37.24   24.76   23.036 22.81 ~ 9 0
69 VCDFS 15034 G 03 32 33.5395 -27 55 13.644   24.5050   23.274 23.0100 ~ 13 0
70 ZFOURGE CDFS 15220 G 03 32 33.7591 -27 48 16.257           ~ 1 0
71 ZFOURGE CDFS 11456 EmG 03 32 33.8248 -27 50 05.176   25.4522     24.9296 ~ 8 0
72 EIS-DEEP CDFS-4 J 1 877 G 03 32 34.10686 -27 49 12.0194   23.539   23.419 23.37 ~ 12 0
73 ZFOURGE CDFS 21881 G 03 32 34.91 -27 45 01.9   23.7208 23.156 22.380 22.4947 ~ 14 0
74 GOODS-MUSIC 15748 G 03 32 35.029 -27 42 44.47   25.89 25.81 25.228 24.180 ~ 5 0
75 VCDFS 18720 G 03 32 35.1803 -27 52 36.178   23.9258   22.945 22.6815 ~ 11 0
76 GOODS J033235.41-274002.6 AGN 03 32 35.408 -27 40 02.30   24.20 23.80 23.62 23.317 ~ 11 0
77 ZFOURGE CDFS 10309 G 03 32 35.5783 -27 50 38.791           ~ 3 0
78 [LBX2017] 672 G 03 32 35.963 -27 48 11.88 24.8051 23.9452   22.066 21.6575 ~ 30 0
79 [SWM2014] GOODS-S 18354 AGN 03 32 36.36 -27 49 33.4   27.012 26.16   24.400 ~ 17 0
80 ZFOURGE CDFS 26346 G 03 32 36.389 -27 42 46.52   24.484 24.18 24.296 22.349 ~ 7 0
81 ZFOURGE CDFS 8548 G 03 32 37.6630 -27 51 24.913           ~ 4 0
82 ZFOURGE CDFS 29507 G 03 32 37.995 -27 40 51.10   25.531 25.28 25.094   ~ 6 0
83 EIS-DEEP CDFS-4 H 1 651 G 03 32 40.17182 -27 50 25.6614   23.249   24.670 22.56 ~ 10 0
84 GOODS J033241.30-275513.9 G 03 32 41.3022 -27 55 13.930   25.7290     23.5259 ~ 10 0
85 ZFOURGE CDFS 7656 G 03 32 41.6016 -27 52 02.418           ~ 4 0
86 GOODS J033241.88-274059.9 G 03 32 41.877 -27 40 59.92   26.33   24.491 23.211 ~ 7 0
87 GOODS-MUSIC 2264 G 03 32 42.0819 -27 53 48.655   25.2034   23.775 23.5511 ~ 10 0
88 GOODS J033242.73-275605.1 G 03 32 42.720 -27 56 05.38       22.621   ~ 6 0
89 [LBX2017] 786 AGN 03 32 42.7231 -27 51 42.374       25.94   ~ 6 0
90 CANDELS UDS F160W J033243.88-274405.7 G 03 32 43.89048 -27 44 05.7840   24.215   23.872   ~ 15 0
91 EIS-DEEP CDFS-4 J 1 1541 G 03 32 44.77207 -27 50 09.9575   24.4689   23.363 24.2831 ~ 9 0
92 CXOCDFS J033246.5-275414 Sy2 03 32 46.4092 -27 54 13.959   23.0602 21.86 20.683 19.9987 ~ 42 0
93 ZFOURGE CDFS 24182 G 03 32 48.3957 -27 43 54.735           ~ 4 0
94 EIS-DEEP CDFS-2 J 1 186 G 03 32 48.990 -27 44 18.62       23.46   ~ 8 0
95 GEMS J033249.84-274757.8 G 03 32 49.8532 -27 47 57.792   24.4638     23.4544 ~ 14 0
96 ZFOURGE CDFS 16327 G 03 32 51.4426 -27 47 44.596           ~ 3 0
97 GOODS-MUSIC 2915 G 03 32 52.95110 -27 53 09.8268   23.283   23.804 22.8586 ~ 11 0
98 ZFOURGE CDFS 12434 EmG 03 32 53.3350 -27 49 37.865           ~ 5 0
99 GOODS J033255.68-275345.8 G 03 32 55.67467 -27 53 45.6418   24.185   25.71 23.2268 ~ 10 0
100 ZFOURGE CDFS 5082 G 03 32 57.76894 -27 53 28.3628   24.334   24.066   ~ 5 0
101 ZFOURGE CDFS 5536 G 03 33 01.3852 -27 53 13.685           ~ 3 0
102 GEMS J033301.86-275200.1 G 03 33 01.87 -27 52 00.2       23.20   ~ 5 0
103 GOODS J033302.04-275335.3 G 03 33 02.0462 -27 53 35.231           ~ 4 0
104 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6075 0

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2021.08.01-15:56:21

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