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J/ApJ/827/74    [NII]/Hα ratio in galaxies with KMOS3D    (Wuyts+, 2016)

The evolution of metallicity and metallicity gradients from z=2.7 to 0.6 with KMOS-3D. Wuyts E., Wisnioski E., Fossati M., Forster Schreiber N.M., Genzel R., Davies R., Mendel J.T., Naab T., Rottgers B., Wilman D.J., Wuyts S., Bandara K., Beifiori A., Belli S., Bender R., Brammer G.B., Burkert A., Chan J., Galametz A., Kulkarni S.K., Lang P., Lutz D., Momcheva I.G., Nelson E.J., Rosario D., Saglia R.P., Seitz S., Tacconi L.J., Tadaki K.-I., Ubler H., van Dokkum P. <Astrophys. J., 827, 74-74 (2016)> =2016ApJ...827...74W (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Abundances ; Redshifts Keywords: galaxies: abundances; galaxies: evolution; galaxies: high-redshift Abstract: We present measurements of the [NII]/Hα ratio as a probe of gas-phase oxygen abundance for a sample of 419 star-forming galaxies at z=0.6-2.7 from the KMOS3D near-IR multi-integral field unit (IFU) survey. The mass-metallicity relation (MZR) is determined consistently with the same sample selection, metallicity tracer, and methodology over the wide redshift range probed by the survey. We find good agreement with long-slit surveys in the literature, except for the low-mass slope of the relation at z∼2.3, where this sample is less biased than previous samples based on optical spectroscopic redshifts. In this regime we measure a steeper slope than some literature results. Excluding the contribution from active galactic nuclei from the MZR reduces sensitivity at the high-mass end, but produces otherwise consistent results. There is no significant dependence of the [NII]/Hα ratio on star formation rate at fixed redshift and stellar mass. The IFU data allow spatially resolved measurements of [NII]/Hα, from which we can infer abundance gradients for 180 galaxies, thus tripling the current sample in the literature. The observed gradients are on average flat, with only 15 gradients statistically offset from zero at >3σ. We have modeled the effect of beam smearing, assuming a smooth intrinsic radial gradient and known seeing, inclination, and effective radius for each galaxy. Our seeing-limited observations can recover up to 70% of the intrinsic gradient for the largest, face-on disks, but only 30% for the smaller, more inclined galaxies. We do not find significant trends between observed or corrected gradients and any stellar population, dynamical, or structural galaxy parameters, mostly in agreement with existing studies with much smaller sample sizes. In cosmological simulations, strong feedback is generally required to produce flat gradients at high redshift. Description: The galaxies analyzed here are taken from the first 2yr of the KMOS3D survey, which covers observations up to 2015 April. The survey is described in detail by Wisnioski+ (2015ApJ...799..209W). KMOS3D is a 5yr GTO survey with the multi-object near-IR integral field spectrograph KMOS at the Very Large Telescope (VLT). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 55 259 Target properties for all galaxies where the [NII]/Hα ratio could be measured
See also: J/A+A/594/A77 : KMOS star-forming gal. Halpha data cubes (Di Teodoro+, 2016) J/ApJ/822/42 : z∼3.3 star-forming galaxies NIR spectra (Onodera+, 2016) J/ApJ/817/10 : Star-forming z∼2.1 galaxy metallicities (Grasshorn Gebhardt+, 2016) J/ApJS/220/12 : FMOS-COSMOS survey III. 0.7<z<2.5 galaxies (Silverman+, 2015) J/AJ/148/137 : Merging galaxies in COSMOS to z∼1 (Lackner+, 2014) J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014) J/ApJ/768/74 : PHIBSS: CO obs. of star-forming galaxies (Tacconi+, 2013) J/ApJ/765/140 : Stacked spectra of SDSS star forming gal. (Andrews+, 2013) J/ApJS/203/24 : Structural param. of galaxies in CANDELS (van der Wel+, 2012) J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011) J/ApJ/706/1364 : SINS survey of high-redshift gal. (Forster Schreiber+, 2009) J/MNRAS/358/521 : Grid of chemical evolution models for galaxies (Molla+, 2005) J/AJ/116/2805 : H II regions in spiral galaxies (Van Zee+, 1998) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/259] Running sequence number 5- 9 F5.3 --- z [0.7/2.6] Redshift 11- 15 F5.2 [Msun] logM* [8.5/11.4] Stellar mass 17- 20 F4.1 kpc re [0.5/16]? Effective radius re 22- 26 F5.1 Msun/yr SFR [0.2/397.8] Hα star formation rate (1) 28 A1 --- l_[NII]/Ha Limit flag on [NII]/Ha 30- 33 F4.2 --- [NII]/Ha [0.08/1.4] Integrated [NII]/Hα ratio 35- 38 F4.2 --- e_[NII]/Ha [0/0.3]? [NII]/Ha uncertainty 40- 45 F6.3 --- dN2/dr [-0.2/0.2]? ΔN2/Δr value, in units of dex/kpc (2) 47- 51 F5.3 --- e_dN2/dr [0.002/0.08]? dN2/dr uncertainty 53- 55 F3.1 --- BCF [1.3/6.2]? Multiplicative beam-smearing correction factor for the N2 gradient (3)
Note (1): Hα-based SFR corrected for dust extinction using the SED-derived reddening and accounting for additional extinction of the nebular lines following Wuyts et al. (2013ApJ...779..135W). Note (2): Observed gradient in [NII]/Hα, excluding the nuclear region for AGN-flagged targets. Reported only when measurable. Note (3): Multiplicative beam-smearing correction factor for the N2 gradient, derived from simple analytical models assuming a smooth linear intrinsic radial gradient.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 24-Nov-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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