J/MNRAS/545/F2029 TIMER catalogue of HII regions (Sanchez-Menguiano+, 2026)
The impact of bars on the properties of HII regions in the TIMER survey.
Sanchez-Menguiano L., Gadotti D.A., Zurita A., Florido E., Perez I.,
Coelho P., Falcon-Barroso J., Kim T., de Lorenzo-Caceres A.,
Lugo-Aranda A.Z., Neumann J., de Sa-Freitas C., Sanchez-Blazquez P.
<Mon. Not. R. Astron. Soc. 545, staf2029 (2026)>
=2026MNRAS.545f2029S 2026MNRAS.545f2029S (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Spectroscopy ; Equivalent widths ; Optical
Keywords: galaxies: spiral - galaxies: evolution - HII regions -
techniques: imaging spectroscopy
Abstract:
In this study we perform a comparative analysis of the properties of
the HII regions located in different areas of barred galaxies, with
the aim of investigating the impact of bars on the physical properties
of the ionised gas. Based on integral field spectroscopy data for 17
barred galaxies covering approximately the central 6x6 kpc, we detect
a total of 2200 HII regions, of which 331 are located within the
nuclear disc (also known as circumnuclear regions), 661 in the bar
region, and 1208 in the disc. Among the physical properties of the HII
regions, we explore the O/H and N/O abundances, Hα luminosity,
dust extinction, electron density, and Hα equivalent width. We
find clear differences in the properties of the HII regions between
the nuclear disc, the bar and the disc, that could be explained by an
enhancement in the molecular gas concentration in the central parts
driven by bar-induced gas flows. As this gas is channelled towards the
galaxy centre, the most extreme values in the analysed properties are
found for the circumnuclear HII regions. Unlike the bar strength,
galaxy mass does seem to affect the properties of the HII regions,
with massive galaxies presenting higher values in most of the
properties, possibly due to the increased amount of gas in these
systems. This study provides evidence that the bar-driven
redistribution of material within the galaxy inner parts causes
significant differences in the HII region properties depending on
their location within the galaxies.
Description:
In this catalogue we provide information for the HII regions on the
flux of the main strong emission lines and some physical properties.
In addition to the HII region properties analysed in the study (O/H
and N/O abundances, Hα luminosity, dust extinction, electron
density, Hα equivalent width), we also include the equatorial
coordinates, the radius of the regions (defined as sqrt(2)σ,
where σ is the dispersion of the Gaussian function used to model
the HII regions; see Lugo-Aranda et al., 2024MNRAS.528.6099L 2024MNRAS.528.6099L), the
environment in which they belong (circumnuclear region, bar, inner
disc, and outer disc), the velocity dispersion of Hα (used to
classify the regions as star forming), and the stellar mass surface
density (used for the analysis of the resolved mass-metallicity
relation). All the measurements are provided together with their
corresponding uncertainties.
The HII regions have been detected using the tool PYHIIEXTRACTOR
(Lugo-Aranda et al., 2024MNRAS.528.6099L 2024MNRAS.528.6099L) based on MUSE data from the
TIMER survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hiicat.dat 338 2200 Catalogue of HII regions in TIMER survey
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Byte-by-byte Description of file: hiicat.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- RegionID HII region ID, including the name of
the host galaxy
13- 20 F8.4 deg RAdeg Right ascension (J2000)
22- 29 F8.4 deg DEdeg Declination (J2000)
31- 33 F3.1 pix Rad Radius of the HII region
35- 42 A8 --- Env Environment in which the HII is
located (circumnuclear region, bar,
inner disc, outer disc)
44- 53 F10.2 10-20mW/m2 FHbeta ? Hbeta flux
55- 68 F14.2 10-20mW/m2 e_FHbeta ? Hbeta flux error
70- 78 F9.2 10-20mW/m2 F[OIII]4959 ? [OIII4959] flux
80- 92 F13.2 10-20mW/m2 e_F[OIII]4959 ? [OIII4959] flux error
94-102 F9.2 10-20mW/m2 F[OIII]5007 ? [OIII5007] flux
104-116 F13.2 10-20mW/m2 e_F[OIII]5007 ? [OIII5007] flux error
118-127 F10.2 10-20mW/m2 F[NII]6548 ? [NII6548] flux
129-142 F14.2 10-20mW/m2 e_F[NII]6548 ? [NII6548] flux error
144-154 F11.2 10-20mW/m2 FHalpha Halpha flux
156-163 F8.2 10-20mW/m2 e_FHalpha Halpha flux error
165-175 F11.2 10-20mW/m2 F[NII]6583 ? [NII6583] flux
177-191 F15.2 10-20mW/m2 e_F[NII]6583 ? [NII6583] flux error
193-202 F10.2 10-20mW/m2 F[SII]6717 ? [SII6717] flux
204-217 F14.2 10-20mW/m2 e_F[SII]6717 ? [SII6717] flux error
219-228 F10.2 10-20mW/m2 F[SII]6731 ? [SII6731] flux
230-240 F11.2 10-20mW/m2 e_F[SII]6731 ? [SII6731] flux error
242-246 F5.2 km/s sigmaHa Halpha velocity dispersion
248-253 F6.2 km/s e_sigmaHa Halpha velocity dispersion error
255-261 F7.2 0.1nm EWHa Halpha equivalent width
263-267 F5.2 0.1nm e_EWHa Halpha equivalent width error
269-273 F5.3 [Msun/pc2] logSigmaMass Stellar mass surface density
277-281 F5.3 --- 12logOH ? Oxygen abundance from the Scal
prescription (Pilyugin et al.,
2016MNRAS.457.3678P 2016MNRAS.457.3678P)
285-289 F5.3 --- e_12logOH ? Error on the oxygen abundance
293-298 F6.3 --- logNO ? N/O ratio from the N2S2 prescription
(Florido et al., 2022MNRAS.513.2006F 2022MNRAS.513.2006F)
302-306 F5.3 --- e_logNO ? Error on the N/O ratio
310-314 F5.3 mag AV ? V-band dust attenuation from the
Balmer decrement assuming the
Cardelli et al. (1989ApJ...345..245C 1989ApJ...345..245C)
extinction curve with RV=3.1
318-322 F5.3 mag e_AV ? Error on the V-band dust attenuation
325-330 F6.3 [10-7W] logLHa ? Dust-corrected Halpha luminosity
334-338 F5.3 [10-7W] e_logLHa ? Error on the dust-corrected
Halpha luminosity
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Acknowledgements:
Laura Sanchez-Menguiano, lsanchezm(at)ugr.es
License: CC-BY-4.0 [see https://spdx.org/licenses/]
(End) Patricia Vannier [CDS] 11-Mar-2026