J/ApJ/887/80 Gas phase oxygen abundances for HII regions (Kreckel+, 2019)
Mapping metallicity variations across nearby galaxy disks.
Kreckel K., Ho I.-T., Blanc G.A., Groves B., Santoro F., Schinnerer E.,
Bigiel F., Chevance M., Congiu E., Emsellem E., Faesi C., Glover S.C.O.,
Grasha K., Kruijssen J.M.D., Lang P., Leroy A.K., Meidt S.E., McElroy R.,
Pety J., Rosolowsky E., Saito T., Sandstrom K., Sanchez-Blazquez P.,
Schruba A.
<Astrophys. J., 887, 80 (2019)>
=2019ApJ...887...80K 2019ApJ...887...80K
ADC_Keywords: Galaxies, nearby; H II regions; Spectra, optical; Abundances
Keywords: H II regions ; Metallicity ; Chemical abundances ; Galaxy abundances ;
Spiral galaxies ; Disk galaxies
Abstract:
The distribution of metals within a galaxy traces the baryon cycle and
the buildup of galactic disks, but the detailed gas phase metallicity
distribution remains poorly sampled. We have determined the gas phase
oxygen abundances for 7138 HII regions across the disks of eight
nearby galaxies using Very Large Telescope/Multi Unit Spectroscopic
Explorer (MUSE) optical integral field spectroscopy as part of the
PHANGS-MUSE survey. After removing the first-order radial gradients
present in each galaxy, we look at the statistics of the metallicity
offset (ΔO/H) and explore azimuthal variations. Across each
galaxy, we find low (σ=0.03-0.05dex) scatter at any given
radius, indicative of efficient mixing. We compare physical parameters
for those HII regions that are 1σ outliers toward both enhanced
and reduced abundances. Regions with enhanced abundances have high
ionization parameter, higher Hα luminosity, lower Hα
velocity dispersion, younger star clusters, and associated molecular
gas clouds showing higher molecular gas densities. This indicates
recent star formation has locally enriched the material. Regions with
reduced abundances show increased Hα velocity dispersions,
suggestive of mixing introducing more pristine material. We observe
subtle azimuthal variations in half of the sample, but cannot always
cleanly associate this with the spiral pattern. Regions with enhanced
and reduced abundances are found distributed throughout the disk, and
in half of our galaxies we can identify subsections of spiral arms
with clearly associated metallicity gradients. This suggests spiral
arms play a role in organizing and mixing the interstellar medium.
Description:
We use the MUSE spectrograph at the VLT to mosaic the central
star-forming disks of eight nearby spiral galaxies as part of the
Physics at High Angular resolution in Nearby GalaxieS (PHANGS)-MUSE
large observing program (PI: Schinnerer).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 8 *Key parameters of our galaxy sample
table2.dat 195 7173 HII region catalog
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Note on table1.dat: The galaxy parameters are adopted from the z0mgs (z=0
multiwavelength galaxy survey; Leroy+ 2019ApJS..244...24L 2019ApJS..244...24L) database
(http://github.com/akleroy/z0mgs), where the original references can
be found.
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/ApJ/424/599 : Abundances in barred spiral galaxies (Martin+ 1994)
J/ApJ/510/104 : Ionizing Stars of Extragalactic H II Regions (Bresolin+ 1999)
J/ApJS/132/37 : Spectroscopy of Southern warm IR galaxies (Kewley+, 2001)
J/A+A/459/L13 : A composite HII region luminosity function (Bradley+, 2006)
J/A+A/459/85 : O/H and gas densities in star-forming galaxies (Nagao+, 2006)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJ/661/801 : Ionization in neutral gas galaxies. III. (Oey+, 2007)
J/ApJ/675/1213 : Abundances in M33 HII regions (Rosolowsky+, 2008)
J/AJ/142/139 : A new catalog of HII regions in M31 (Azimlu+, 2011)
J/ApJ/738/27 : Galactic HII regions RRL and continuum data (Balser+, 2011)
J/ApJ/755/40 : HII reg. in Magellanic clouds from MCELS (Pellegrini+, 2012)
J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)
J/MNRAS/445/881 : LVL global optical photometry (Cook+, 2014)
J/AJ/147/131 : Abundances of nearby late-type galaxies. I. (Pilyugin+, 2014)
J/ApJ/806/199 : RRL and continuum data of 21 Galactic HII reg. (Balser+, 2015)
J/ApJ/806/16 : CHemical Abundances of Spirals. I. NGC628 (Berg+, 2015)
J/ApJ/808/42 : CHemical Abundances of Spirals. II. M51 (Croxall+, 2015)
J/MNRAS/455/2627 : Oxygen abundance gradient in M81 (Arellano-Cordova+, 2016)
J/ApJ/830/4 : HII region abundances in NGC 5457 (M101) (Croxall+, 2016)
J/A+A/615/A40 : OB stars in N206 in the LMC (Ramachandran+, 2018)
J/ApJ/860/172 : Cloud-scale molecular gas properties in 15 gal. (Sun+, 2018)
J/ApJ/882/9 : Gas-phase metallicity in MaNGA gal. (Sanchez-Menguiano+, 2019)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Gal Galaxy name
9- 13 F5.2 Mpc Dist [9.77/16.8] Distance
15- 18 F4.2 Mpc e_Dist [0.82/5.6] Dist uncertainty
20- 27 A8 --- Type Morphological type
29- 32 F4.1 [Msun] logM [9.6/10.6] Log of stellar mass
34- 38 F5.2 [Msun/yr] logSFR [-0.31/0.74] Log of stellar formation rate
40- 44 F5.1 deg PA [1.6/179.8] Position angle
46- 49 F4.1 deg Inc [8.7/55] Inclination
51- 53 F3.1 arcmin R25 [1.5/5.1] Galactic radius at 25mag/arcsec2
from HyperLeda
55- 57 F3.1 arcsec Ares [0.5/1] Angular resolution
59- 60 I2 pc Pres [38/70] Physical resolution
62- 65 I4 --- Nreg [223/1824] Number of HII regions
67- 69 I3 kpc2 Area [42/191] Survey area
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Gal Galaxy name
8 A1 --- --- [_]
9- 12 I04 --- ID Region identifier within Gal
14- 23 F10.6 deg RAdeg [24.13/353.64] Right Ascension (J2000)
25- 34 F10.6 deg DEdeg [-59.3/15.82] Declination (J2000)
36- 39 F4.2 --- Rad [0/0.98] Radius normalized to the
galactic radius at 25 mag/arcsec2
41- 44 F4.2 mag E(B-V) [0/1.7] The (B-V) color excess
46- 49 F4.2 mag e_E(B-V) [0/0.08] Uncertainty in E(B-V)
51- 58 E8.2 10-7W LHa [8.8e+35/1.9e+40] Hα line
luminosity (1)
60- 66 E7.1 10-7W e_LHa [1.4e+34/4.3e+36] Uncertainty
in LHa (1)
68- 75 E8.2 10-20mW/m2 Hb [945/39200000] Integrated
Hβ line flux (2)
77- 83 E7.1 10-20mW/m2 e_Hb [340/140000] Uncertainty in Hb (2)
85- 92 E8.2 10-20mW/m2 O3-5007 [293/7070000] Integrated
[OIII](5007Å) line flux (2)
94-100 E7.1 10-20mW/m2 e_O3-5007 [110/50000] Uncertainty in O3-5007 (2)
102-109 E8.2 10-20mW/m2 N2 [1180/44800000] Integrated
[NII](6548+6584Å) line fluxes (2)
111-117 E7.1 10-20mW/m2 e_N2 [170/88000] Uncertainty in N2 (2)
119-126 E8.2 10-20mW/m2 Ha [2620/112000000] Integrated
Hα line flux (2)
128-134 E7.1 10-20mW/m2 e_Ha [530/200000] Uncertainty in Ha (2)
136-143 E8.2 10-20mW/m2 S2-6716 [615/13500000] Integrated
[SII](6716Å) line flux (2)
145-151 E7.1 10-20mW/m2 e_S2-6716 [86/31000] Uncertainty in S2-6716 (2)
153-160 E8.2 10-20mW/m2 S2-6731 [422/11000000] Integrated
[SII](6731Å) line flux (2)
162-168 E7.1 10-20mW/m2 e_S2-6731 [70/25000] Uncertainty in S2-6731 (2)
170-177 E8.2 10-20mW/m2 S3-9069 [0/4650000] Integrated
[SIII](9069Å) line flux (2)
179-185 E7.1 10-20mW/m2 e_S3-9069 [0/4700000] Uncertainty in S3-9069 (2)
187-190 F4.2 [-] 12+log(0/H) [8.1/8.7] log gas phase oxygen
abundance
192-195 F4.2 [-] e_12+log(0/H) [0/0.21] Uncertainty in 12+log(0/H)
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Note (1): In units of erg/s.
Note (2): In units of 10-20erg/s/cm2.
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Nomenclature note:
HII regions are <[KHB2019] {Gal} {ID}> in Simbad.
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-May-2021