J/A+A/662/L6 Properties of HII regions in NGC1672 (Barnes+, 2022)
Linking stellar populations to HII regions across nearby galaxies:
I. Constraining pre-supernova feedback from young clusters in NGC1672.
Barnes A.T., Chandar R., Kreckel K., Glover S.C.O., Scheuermann F.,
Belfiore F., Bigiel F., Blanc G.A., Boquien M., den Brok J., Congiu E.,
Chevance M., Dale D.A., Deger S., Kruijssen J.M.D., Egorov O.V.,
Eibensteiner C., Emsellem E., Grasha K., Groves B., Klessen R.S.,
Hannon S., Hassani H., Lee J.C., Leroy A.K., Lopez L.A., McLeod A.F.,
Pan H., Sanchez-Blazquez P., Schinnerer E., Sormani M.C., Thilker D.A.,
Ubeda L., Watkins E.J., Williams T.G.
<Astron. Astrophys. 662, L6 (2022)>
=2022A&A...662L...6B 2022A&A...662L...6B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; H II regions
Keywords: (ISM:) HII regions - galaxies: evolution -
galaxies: star clusters: general
Abstract:
One of the fundamental factors regulating the evolution of galaxies is
stellar feedback. However, we still do not have strong observational
constraints on the relative importance of the different feedback
mechanisms (e.g. radiation, ionised gas pressure, stellar winds) in
driving HII region evolution and molecular cloud disruption. In this
letter, we constrain the relative importance of the various feedback
mechanisms from young massive star populations by resolving HII
regions across the disk of the nearby star-forming galaxy NGC 1672.
We combine measurements of ionised gas nebular lines obtained by
PHANGS-MUSE, with high-resolution imaging from the HST in both the
narrow-band Hα and broad-band filters. We identify a sample of
40 isolated, compact HII regions in the HST Hα image, for which
we measure the sizes that were previously unresolved in seeing-limited
ground-based observations. Additionally, we identify the ionisation
source(s) for each HII region from catalogues produced as part of the
PHANGS-HST survey. We find that the HII regions investigated are
mildly dominated by thermal or wind pressure, yet their elevation
above the radiation pressure is within the expected uncertainty range.
We see that radiation pressure provides a substantially higher
contribution to the total pressure than previously found in the
literature over similar size scales. In general, we find higher
pressures within more compact HII regions, which is driven by the
inherent size scaling relations of each pressure term, albeit with
significant scatter introduced by the variation in the stellar
population properties (e.g. luminosity, mass, age, metallicity). For
nearby galaxies, here we provide a promising approach that could yield
the statistics required to map out how the importance of different
stellar feedback mechanisms evolve over the lifetime of an HII region.
Description:
In table A.1, we summarise the properties of the HII region sample
studied in this work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 328 40 Properties of the HII region sample
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [0/39] Identifier
4- 20 F17.14 deg RAdeg Central Right ascension (J2000)
22- 40 F19.15 deg DEdeg Central Declination (J2000)
42- 60 F19.16 pc Rad Radius
62- 79 F18.16 --- Rgal/Reff Galactocentric radius (normalised by the
effective radius)
81- 99 F19.15 [mW/m2] logHac Extinction corrected Hα flux
101-119 F19.17 mag E(B-V) Extinction
121-138 F18.16 [Lsun] logLHa Extinction corrected Hα luminosity
140-156 F17.15 --- Met Metallicity (units in 12+log10(O/H))
158-175 F18.16 Myr Age Stellar population age
177-194 F18.16 [Msun] logMass Stellar population mass
196-213 F18.16 [Lsun] logLbol Stellar population bolometric luminosity
215-232 F18.15 [10-7W] logLmech Mechanical luminosity
234-251 F18.15 [g/s] dM/dt Mass loss rate
253-271 F19.15 cm-3 ne Electron density
273-290 F18.16 [K/cm3] logPtherm Thermal pressure
292-309 F18.16 [K/cm3] logPrad Radiation pressure
311-328 F18.16 [K/cm3] logPwind Wind pressure
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Acknowledgements:
Ashley Barnes, ashleybarnes.astro(at)gmail.com
(End) Patricia Vannier [CDS] 25-May-2022