2018ApJ...867...92S


Query : 2018ApJ...867...92S

2018ApJ...867...92S - Astrophys. J., 867, 92-92 (2018/November-2)

The molecular gas content and fuel efficiency of starbursts at z ∼ 1.6 with ALMA.

SILVERMAN J.D., RUJOPAKARN W., DADDI E., RENZINI A., RODIGHIERO G., LIU D., PUGLISI A., SARGENT M., MANCINI C., KARTALTEPE J., KASHINO D., KOEKEMOER A., ARIMOTO N., BETHERMIN M., JIN S., MAGDIS G., NAGAO T., ONODERA M., SANDERS D. and VALENTINO F.

Abstract (from CDS):

We present an analysis of the molecular gas properties, based on CO (2-1) emission, of 12 starburst galaxies at z ∼ 1.6 selected by having a boost (>=4x) in their star formation rate (SFR) above the average star-forming galaxy at an equivalent stellar mass. ALMA observations are acquired of six more galaxies than previously reported through our effort. As a result of the larger statistical sample, we significantly detect, for the first time at high z, a systematically lower LCO^′^/LIR ratio in galaxies lying above the star-forming "main sequence" (MS). Based on an estimate of αCO (i.e., the ratio of molecular gas mass to LCO1–0^′^), we convert the observational quantities (e.g., LCO^′^/LIR) to physical units (Mgas/SFR) that represent the gas depletion time or its inverse, the star formation efficiency. We interpret the results as indicative of the star formation efficiency increasing in a continuous fashion from the MS to the starburst regime, whereas the gas fractions remain comparable to those of MS galaxies. However, the balance between an increase in star formation efficiency and gas fraction depends on the adopted value of αCO as discussed.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: high-redshift - galaxies: ISM - galaxies: starburst - galaxies: star formation

Nomenclature: Table 1: [PDR2017] NNN N=6 among (Nos 164-867) added.

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2223 1
2 ICRF J094857.3+002225 Sy1 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 289 2
3 UVISTADR1 J095856.54+020347.9 EmG 09 58 56.54 +02 03 48.0 25.45 25.21 24.84 24.72 24.46 ~ 4 0
4 COSMOS 2387508 EmG 09 59 38.10 +02 28 57.1 24.84 24.56 24.11 23.80 23.16 ~ 6 0
5 COSMOS 1650509 EmG 09 59 41.31 +02 14 42.8 26.14 25.92 25.42 25.21 24.34 ~ 12 0
6 ACS-GC 20092808 EmG 09 59 55.54 +02 15 11.4 24.00 23.71 23.27 23.12 22.68 ~ 19 0
7 [PDR2017] 491 SBG 10 00 05.18 +02 42 04.8 24.21 23.89 23.53 23.49 23.11 ~ 4 0
8 COSMOS 2030872 G 10 00 05.53 +02 19 42.9 24.48 24.17 23.87 23.70 23.26 ~ 6 0
9 ACS-GC 20123399 AGN 10 00 08.76000 +02 19 01.9999         22.36 ~ 18 0
10 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2676 0
11 [PDR2017] 837 EmG 10 00 36.31 +02 21 17.5 23.789 23.70 23.48 23.50 23.28 ~ 12 0
12 COSMOS 855710 EmG 10 01 30.42 +01 54 12.5 24.05 23.82 23.46 23.36 23.06 ~ 7 0
13 COSMOS2015 449383 SBG 10 01 34.46 +01 58 48.1 26.75 26.510 26.738 26.12 25.07 ~ 9 0
14 ACS-GC 20081285 SBG 10 02 27.91 +02 10 04.8 23.91 23.358 23.332   22.524 ~ 13 0
15 COSMOS 1513491 G 10 02 39.63 +02 08 47.1 23.483 23.26 22.94 22.92 22.66 ~ 6 0
16 NAME HLock01 G 10 57 51.1 +57 30 27           ~ 35 0
17 4C 01.28 BLL 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 731 2
18 NAME SMM J123711+622212 AGN 12 37 11.92 +62 22 12.1   27.1786 25.185   24.4196 ~ 189 0
19 NAME Eyelash LeG 21 35 11.60 -01 02 52.0           ~ 213 0

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2023.01.28-10:39:47

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