2018A&A...616A.110E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:29:41

2018A&A...616A.110E - Astronomy and Astrophysics, volume 616A, 110-110 (2018/8-1)

Starbursts in and out of the star-formation main sequence.

ELBAZ D., LEITON R., NAGAR N., OKUMURA K., FRANCO M., SCHREIBER C., PANNELLA M., WANG T., DICKINSON M., DIAZ-SANTOS T., CIESLA L., DADDI E., BOURNAUD F., MAGDIS G., ZHOU L. and RUJOPAKARN W.

Abstract (from CDS):


Aims. We use high-resolution continuum images obtained with the Atacama Large Millimeter Array (ALMA) to probe the surface density of star formation in z∼2 galaxies and study the different physical properties between galaxies within and above the star-formation main sequence of galaxies.
Methods. We use ALMA images at 870µm with 0.2-arcsec resolution in order to resolve star formation in a sample of eight star-forming galaxies at z∼2 selected among the most massive Herschel galaxies in the GOODS-South field. This sample is supplemented with eleven galaxies from the public data of the 1.3 mm survey of the Hubble Ultra-Deep Field, HUDF. We derive dust and gas masses for the galaxies, compute their depletion times and gas fractions, and study the relative distributions of rest-frame ultraviolet (UV) and far-infrared (FIR) light.
Results. ALMA reveals systematically dense concentrations of dusty star formation close to the center of the stellar component of the galaxies. We identify two different starburst regimes: (i) the classical population of starbursts located above the SFR-M* main sequence, with enhanced gas fractions and short depletion times and (ii) a sub-population of galaxies located within the scatter of the main sequence that experience compact star formation with depletion timescales typical of starbursts of ∼150Myr. In both starburst populations, the FIR and UV are distributed in distinct regions and dust-corrected star formation rates (SFRs) estimated using UV-optical-near-infrared data alone underestimate the total SFR. Starbursts hidden in the main sequence show instead the lowest gas fractions of our sample and could represent the last stage of star formation prior to passivization. Being Herschel-selected, these main sequence galaxies are located in the high-mass end of the main sequence, hence we do not know whether these "starbursts hidden in the main sequence" also exist below 1011M. Active galactic nuclei (AGNs) are found to be ubiquitous in these compact starbursts, suggesting that the triggering mechanism also feeds the central black hole or that the active nucleus triggers star formation.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: evolution - galaxies: starburst - galaxies: active - galaxies: formation - galaxies: star formation - submillimeter: galaxies

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [AZW2014] 2 AGN 03 32 14.5474 -27 52 56.556   25.73 24.93 24.52 24.66 ~ 16 0
2 [GFG2013b] 7184 NIR 03 32 17.190 -27 50 37.10           ~ 15 0
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1812 1
4 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1053 1
5 CANDELS UDS F160W J033228.51-274658.1 AGN 03 32 28.51 -27 46 58.1   26.2       ~ 19 0
6 [DMB2017] UDF6 G 03 32 34.434 -27 46 59.57   26.5124 26.23 26.27 25.21 ~ 27 0
7 [SWM2014] GOODS-S 28844 AGN 03 32 35.076 -27 46 47.54 27.8738 27.6806 26.52   25.787 ~ 26 0
8 NAME BzK 4892 AGN 03 32 35.7111 -27 49 16.022   25.681 27.798 25.00 24.645 ~ 67 0
9 [WLF2008b] 3391 G 03 32 36.971 -27 47 27.24   27.66 26.94   25.84 ~ 12 0
10 [SWM2014] GOODS-S 16960 rG 03 32 37.74 -27 50 00.3   24.914   23.95 23.640 ~ 16 0
11 GEMS J033238.53-274634.0 AGN 03 32 38.541 -27 46 34.03 26.9734 25.3657 24.647 24.68 24.65 ~ 34 0
12 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1283 0
13 GOODS-MUSIC 2690 AGN 03 32 39.248 -27 53 25.61       25.32   ~ 6 0
14 [DMB2017] UDF8 AGN 03 32 39.737 -27 46 11.25 25.2508 25.0913 25.00 24.94 23.902 ~ 69 0
15 [SWM2014] GOODS-S 24110 AGN 03 32 40.055 -27 47 55.42 25.2984 24.0577 23.690 23.701 23.084 ~ 39 0
16 [SPE2008] 120 G 03 32 41.024 -27 46 31.39   29.3567 28.57   26.99 ~ 12 0
17 [DMB2017] UDF16 G 03 32 42.379 -27 47 07.61 26.7385 26.0835 25.32   24.20 ~ 31 0
18 UDF 7679 G 03 32 43.323 -27 46 46.74   28.0913 26.67     ~ 13 0
19 ZFOURGE CDFS 18645 NIR 03 32 43.5274 -27 46 39.003           ~ 3 0
20 [CBS2006] 6462 G 03 32 43.612 -27 46 58.83 25.1337 24.5388 24.219 23.97 23.64 ~ 33 0
21 [CCO2011] UDF0225 NIR 03 32 44.026 -27 46 35.70   29.7791 27.82     ~ 12 0
22 [GFG2013b] 5893 G 03 32 46.83 -27 51 21.1           ~ 2 0
23 GNS 5040 G 03 32 54.68 -27 51 40.5           ~ 8 0
24 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2683 4

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2020.07.10-02:29:41

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