J/ApJ/822/42 z∼3.3 star-forming galaxies NIR spectra (Onodera+, 2016)
ISM excitation and metallicity of star-forming galaxies at z≃3.3
from Near-IR spectroscopy.
Onodera M., Carollo C.M., Lilly S., Renzini A., Arimoto N., Capak P.,
Daddi E., Scoville N., Tacchella S., Tatehora S., Zamorani G.
<Astrophys. J., 822, 42-42 (2016)>
=2016ApJ...822...42O 2016ApJ...822...42O (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Spectra, infrared ; Redshifts ; Abundances ;
Extinction
Keywords: galaxies: evolution; galaxies: formation; galaxies: high-redshift;
galaxies: stellar content
Abstract:
We study the relationship between stellar mass, star formation rate
(SFR), ionization state, and gas-phase metallicity for a sample of 41
normal star-forming galaxies at 3≲z≲3.7. The gas-phase oxygen
abundance, ionization parameter, and electron density of ionized gas
are derived from rest-frame optical strong emission lines measured on
near-infrared spectra obtained with Keck/Multi-Object Spectrograph for
Infra-Red Exploration. We remove the effect of these strong emission
lines in the broadband fluxes to compute stellar masses via spectral
energy distribution fitting, while the SFR is derived from the
dust-corrected ultraviolet luminosity. The ionization parameter is
weakly correlated with the specific SFR, but otherwise the ionization
parameter and electron density do not correlate with other global
galaxy properties such as stellar mass, SFR, and metallicity. The
mass-metallicity relation (MZR) at z∼3.3 shows lower metallicity by
∼0.7dex than that at z=0 at the same stellar mass. Our sample shows an
offset by ∼0.3dex from the locally defined mass-metallicity-SFR
relation, indicating that simply extrapolating such a relation to
higher redshift may predict an incorrect evolution of MZR.
Furthermore, within the uncertainties we find no SFR-metallicity
correlation, suggesting a less important role of SFR in controlling
the metallicity at high redshift. We finally investigate the redshift
evolution of the MZR by using the model by Lilly et al.
(2013ApJ...772..119L 2013ApJ...772..119L), finding that the observed evolution from z=0 to
z∼3.3 can be accounted for by the model assuming a weak redshift
evolution of the star formation efficiency.
Description:
Our primary sample has been extracted from the zCOSMOS-Deep redshift
catalog (Lilly et al. 2007, J/ApJS/172/70 and in preparation).
Observation has been carried out on 2014 January 20-22 and 2015
January 15 using MOSFIRE on Keck I. We used 1" and 0.7" slit width in
2014 and 2015 runs, respectively, which provides instrumental
resolution of R∼2500 and 3600, respectively. We observed in J, H, and
K gratings in the 2014 run because there are some lower-redshift
objects for which [OII]λ3727 falls into J band, while only H
and K gratings are used in the 2015 run.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 43 Properties of the galaxy sample and the
observation log
table2.dat 92 43 Emission line measurements
table3.dat 84 43 Stellar mass, dust extinction, and star formation rate
table5.dat 55 43 Ionizing gas properties
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See also:
II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)
J/MNRAS/448/3484 : ATLAS3D Project. XXX (McDermid+, 2015)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)
J/ApJS/208/10 : κ-distribution effects in HII regions (Dopita+, 2013)
J/A+A/556/A55 : Multi-color photom. of star-forming galaxies (Ilbert+, 2013)
J/ApJ/771/85 : Dynamical masses of z∼2 quiescent gal. (van de Sande+, 2013)
J/ApJ/765/140 : Stacked spectra of SDSS star forming galaxies (Andrews+, 2013)
J/ApJS/200/9 : The ACS-GC catalog (Griffith+, 2012)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/MNRAS/421/1043 : Emission-line galaxies from SDSS DR7 (Shirazi+, 2012)
J/MNRAS/401/1521 : Lyman break galaxy stellar masses at z∼3 (Magdis+, 2010)
J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)
J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)
J/A+A/459/85 : O/H and gas densities in star-forming galaxies (Nagao+, 2006)
J/ApJ/647/128 : Hα observations of UV-selected galaxies (Erb, 2006)
J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)
J/ApJ/621/673 : Line indices for 124 early-type galaxies (Thomas+, 2005)
J/ApJ/617/240 : Oxygen abundances in the GOODS-North field (Kobulnicky+, 2004)
J/AJ/127/2002 : Star Formation Rate of NFGS galaxies (Kewley+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID [191932/434625] Source identifier
8- 16 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
18- 25 F8.6 deg DEdeg Declination in decimal degrees (J2000)
27- 31 F5.3 --- zph [2.8/3.8] Photometric redshift from
Ilbert et al. (2013, J/A+A/556/A55)
33- 38 F6.4 --- zsp [3/3.51]? zCOSMOS-Deep spectroscopic redshift
40- 43 I4 yr Run [2014/2015] Year of the observing run
45- 46 I2 min ExpH [28/72] H band exposure time
48- 49 I2 min ExpK [30/84] K band exposure time
51- 55 F5.2 mag Bmag [23.8/28.1] B band total AB magnitude
57- 61 F5.2 mag Ksmag [21.7/25.4] Ks band total AB magnitude not
corrected for emission lines
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Source identifier
8- 14 F7.5 --- z [2.9/3.7] Observed MOSFIRE spectroscopic
redshift (1)
16 A1 --- l_FO2 The 3σ limit flag on FO2
17- 22 F6.2 10-20W/m2 FO2 [0.7/7.4] Flux in [OII] 3726+3729Å
lines (2)
24- 27 F4.2 10-20W/m2 e_FO2 [0.08/1.3]? Uncertainty in FO2
29 A1 --- l_FNe3 The 3σ limit flag on FNe3
30- 35 F6.2 10-20W/m2 FNe3 [0.09/4.5]? Flux in [NeIII] 3869Å
line (2)
37- 40 F4.2 10-20W/m2 e_FNe3 [0.04/0.3]? Uncertainty in FNe3
42 A1 --- l_FHb The 3σ limit flag on FHb
43- 48 F6.2 --- FHb [0.2/6.8]? Flux in Hβ line (3)
50- 53 F4.2 --- e_FHb [0.05/0.5]? Uncertainty in FHb
55 A1 --- l_FO3-4959 The 3σ limit flag on FO3-4959
56- 61 F6.2 10-20W/m2 FO3-4959 [0.2/18] Flux in [OIII] 4959Å line (2)
63- 66 F4.2 10-20W/m2 e_FO3-4959 [0.05/0.5]? Uncertainty in FO3-4959
68- 72 F5.2 10-20W/m2 FO3-5007 [0.7/53.3] Flux in [OIII] 5007A line (2)
74- 77 F4.2 10-20W/m2 e_FO3-5007 [0.07/1.1] Uncertainty in FO3-5007
79- 82 F4.2 --- fcHb [1/1.3] Correction factor for Hβ
absorption (4)
84- 87 F4.2 --- femH [0/0.8] Fraction emission line
contribution to H band
89- 92 F4.2 --- femK [0.04/1] Fraction emission line
contribution to K band
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Note (1): The associated 1σ error is typically an order of ≤1e-4.
Note (2): Line not corrected for dust extinction. Units are 1e-17erg/s/cm2.
Note (3): Flux not corrected for the underlying stellar absorption. To correct
it, one need to multiply FHb by fcHb.
Note (4): Assuming 2 Angstrom in the equivalent width
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Source identifier
8- 12 F5.2 [Msun] logM* [8.3/11] Log stellar mass
14- 17 F4.2 [Msun] e_logM* [0.02/0.5] Lower uncertainty in logM*
19- 22 F4.2 [Msun] E_logM* [0.02/0.3] Upper uncertainty in logM*
24- 27 F4.2 mag Av-SED [0/1] V band extinction from SED
29- 32 F4.2 mag e_Av-SED [0/0.3] Lower uncertainty in Av-SED
34- 37 F4.2 mag E_Av-SED [0/0.4] Upper uncertainty in Av-SED
39- 42 F4.2 mag Av-UV [0/1.7] V band extinction from UV
44- 47 F4.2 mag e_Av-UV [0.05/0.6] Uncertainty in Av-UV
49- 52 F4.2 [Msun/yr] logSFR-SED [0.6/2.2] Log Star Formation rate
from SED
54- 57 F4.2 [Msun/yr] e_logSFR-SED [0.02/1.1] Lower uncertainty
in logSFR-SED
59- 62 F4.2 [Msun/yr] E_logSFR-SED [0.02/0.8] Upper uncertainty
in logSFR-SED
64- 67 F4.2 [Msun/yr] logSFR-UV [0.5/2.3] Log Star Formation rate
from UV
69- 72 F4.2 [Msun/yr] e_logSFR-UV [0.02/0.3] Uncertainty in logSFR-UV
74 A1 --- l_logSFR-Hb Limit flag on logSFR-Hb
75- 79 F5.2 [Msun/yr] logSFR-Hb [0.5/2.2]? Log Star Formation rate
from Hβ
81- 84 F4.2 [Msun/yr] e_logSFR-Hb [0.03/0.3]? Uncertainty in logSFR-Hb
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- ID Source identifier
8- 8 A1 --- l_logq Limit flag on logq
9- 13 F5.2 [cm/s] logq [7.3/8]? Log ionization parameter;
see Section 4.2
15- 18 F4.2 [cm/s] e_logq [0.03/0.2]? Lower uncertainty in logq
20- 23 F4.2 [cm/s] E_logq [0.03/0.2]? Upper uncertainty in logq
25- 25 A1 --- l_logne Limit flag on logne
26- 30 F5.2 [cm-3] logne [1.9/3.4]? Log electron density
32- 35 F4.2 [cm-3] e_logne [0.07/0.5]? Lower uncertainty in logne
37- 40 F4.2 [cm-3] E_logne [0.07/0.4]? Upper uncertainty in logne
42- 45 F4.2 [Sun] logO/H [7.8/8.9]? The 12 + log(O/H) number abundance
47- 50 F4.2 [Sun] e_logO/H [0.05/0.3]? Lower uncertainty in logO/H
52- 55 F4.2 [Sun] E_logO/H [0.05/0.2]? Upper uncertainty in logO/H
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Aug-2016