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J/MNRAS/478/4293 0.1<z<0.8 galaxies gas-phase metallicity grad.  (Carton+, 2018)

First gas-phase metallicity gradients of 0.1<z<0.8 galaxies with MUSE. Carton D., Brinchmann J., Contini T., Epinat B., Finley H., Richard J., Patricio V., Schaye J., Nanayakkara T., Weilbacher P.M., Wisotzki <Mon. Not. R. Astron. Soc. 478, 4293 (2018)> =2018MNRAS.478.4293C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Abundances ; Redshifts ; Interstellar medium Keywords: galaxies: evolution - galaxies: abundances - galaxies: ISM Abstract: Galaxies at low-redshift typically possess negative gas-phase metallicity gradients (centres more metal-rich than their outskirts). Whereas, it is not uncommon to observe positive metallicity gradients in higher-redshift galaxies (z<0.6). Bridging these epochs, we present gas-phase metallicity gradients of 84 star-forming galaxies between 0.08<z<0.84. Using the galaxies with reliably determined metallicity gradients, we measure the median metallicity gradient to be negative (-0.039+0.007-0.009dex/kpc). Underlying this, however, is significant scatter: (8±3)% [7] of galaxies have significantly positive metallicity gradients, (38±5)% [32] have significantly negative gradients, (31±5)% [26] have gradients consistent with being flat. (The remaining (23±5)% [19] have unreliable gradient estimates.) We notice a slight trend for a more negative metallicity gradient with both increasing stellar mass and increasing star formation rate (SFR). However, given the potential redshift and size selection effects, we do not consider these trends to be significant. Indeed, once we normalize the SFR relative to that of the main sequence, we do not observe any trend between the metallicity gradient and the normalized SFR. This is contrary to recent studies of galaxies at similar and higher redshifts. We do, however, identify a novel trend between the metallicity gradient of a galaxy and its size. Small galaxies (rd<3kpc) present a large spread in observed metallicity gradients (both negative and positive gradients). In contrast, we find no large galaxies (rd > 3 kpc) with positive metallicity gradients, and overall there is less scatter in the metallicity gradient amongst the large galaxies. These large (well-evolved) galaxies may be analogues of present-day galaxies, which also show a common negative metallicity gradient. Description: Using MUSE data we present metallicity gradients for a sample of 84 intermediate-redshift galaxies (0.1≲z≲0.8). We infer the true metallicity gradient using a forward-modelling technique that corrects for the seeing effects. We search for trends of the observed metallicity gradient with global properties such as galaxy mass, size, and SFR. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . this file tablea1.dat 169 84 Metallicity, mass, SFR and morphological properties
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Field Targeted field (1) 7- 14 I8 --- ID ID number of galaxy within field (1) 16- 21 F6.3 [-] logZ0 [-0.714/0.696] Derived central metallicity (2) 23- 28 F6.3 [-] b_logZ0 [-0.854/-0.004] -1 sigma error on logZ0 (3) 30- 34 F5.3 [-] B_logZ0 [0.002/0.5] ? +1 sigma error on logZ0 (4) 36- 42 F7.4 kpc-1 dlogZ [-0.2615/0.2406] Derived metallicity gradient (2) 44- 50 F7.4 kpc-1 b_dlogZ [-0.3773/-0.0009] -1 sigma error on dlogZ (3) 52- 57 F6.4 kpc-1 B_dlogZ [0.0009/0.2314] +1 sigma error on dlogZ (4) 59- 68 A10 --- Grad Metallicity gradient classification 70- 75 F6.3 [Msun] Mass [7.002/10.6] ? Stellar mass derived from MAGPHYS (2) 77- 82 F6.3 [Msun] b_Mass [-0.315/0.0] -1 sigma error on Mass (3) 84- 88 F5.3 [Msun] B_Mass [0.0/0.365] +1 sigma error on Mass (4) 90- 95 F6.3 [Msun/yr] SFR [-2.254/1.42] SFR derived from emission lines (2) 97-102 F6.3 [Msun/yr] b_SFR [-0.573/-0.006] -1 sigma error on SFR (3) 104-108 F5.3 [Msun/yr] B_SFR [0.008/0.673] +1 sigma error on SFR (4) 110-115 F6.3 --- dSFR [-0.8/1.167] Galaxy SFR normalized relative to a galaxy with identical mass on the main sequence 117-121 F5.3 --- e_dSFR [0.017/0.61] 1 sigma error on dSFR 123-132 F10.6 deg RAdeg [53/338.3] Right ascension of galaxy centre (J2000) 134-143 F10.6 deg DEdeg [-60.58/2.08] Declination of galaxy centre (J2000) 145-150 F6.4 --- z [0.0771/0.8441] Redshift derived from MUSE spectra 152-155 F4.2 kpc rd [0.15/6.71] Exponential disc scale length 157-161 F5.2 deg Inc [0.58/70.0] Galaxy inclination 163-169 F7.2 deg PA [-88.32/144.0] Position angle of galaxy's major axis on the sky, North=0, East=90
Note (1): Field and ID can be combined to produce a unique key Note (2): Median value Note (3): -1 sigma is defined by the 16th percentile Note (4): +1 sigma is defined by the 84th percentile
Acknowledgements: David Carton, david.carton(at)
(End) Patricia Vannier [CDS] 17-May-2018
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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