J/MNRAS/477/4152 H II region candidates in NGC628 (Rousseau-Nepton+, 2018)
NGC628 with SITELLE: I. Imaging spectroscopy of 4285 H II region candidates.
Rousseau-nepton L., Robert C., Martin R.P., Drissen L., Martin T.
<Mon. Not. R. Astron. Soc., 477, 4152-4186 (2018)>
=2018MNRAS.477.4152R 2018MNRAS.477.4152R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; H II regions ; Abundances
Keywords: instrumentation: spectrographs; H II regions -
galaxies: individual: NGC 628 - galaxies: spiral -
galaxies: star formation
Abstract:
This is the first paper of a series dedicated to nebular physics and
the chemical evolution of nearby galaxies by investigating large
samples of H II regions with the Canada-France-Hawaii Telescope
imaging spectrograph SITELLE (Spectro-Imageur a Transformee de Fourier
pour l'Etude en Long et en Large des raies d'Emission). We present a
technique adapted to imaging spectroscopy to identify and extract
parameters from 4285 H II region candidates found in the disc of NGC
628. Using both the spatial and spectral capabilities of SITELLE, our
technique enables the extraction of the position, dust extinction,
velocity, Hα profile, diffuse ionized gas (DIG) background,
luminosity, size, morphological type, and the emission-line fluxes for
individual spaxels and the integrated spectrum for each region. We
have produced a well-sampled H II region luminosity function and
studied its variation with galactocentric radius and level of the DIG
background. We found a slope α of -1.12±0.03 with no
evidence of a break at high luminosity. Based on the width of the
region profile, bright regions are rather compact, while faint regions
are seen over a wide range of sizes. The radius function reveals a
slope of -1.81±0.02. BPT diagrams of the individual spaxels and
integrated line ratios confirm that most detections are H II regions.
Also, maps of the line ratios show complex variations of the
ionization conditions within HII regions. All this information is
compiled in a new catalogue for HII regions. The objective of this
data base is to provide a complete sample which will be used to study
the whole parameter space covered by the physical conditions in active
star-forming regions.
Description:
NGC 628 was observed with SITELLE at the Canada-France-Hawaii
Telescope (CFHT) during the instrument commissioning and science
verification runs in 2015 August and 2016 January.
For this project, three filters have been used : SN1, SN2, and SN3.
These configurations enabled the measurement of multiple strong
emission lines: [OII] λ3727, Hβ (4861Å),
[OIII] λ4959, [OIII] λ5007, [NII] λ6548,
Hα (6563Å), [NII] λ6583, HeI λ6678,
[SII] λ6716, and [SII] λ6731.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 520 4285 Catalog
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See also:
J/ApJ/806/16 : CHemical Abundances of Spirals (CHAOS). I. NGC628 (Berg+, 2015)
J/ApJ/826/209 : IRX-β relation of HII regions in NGC628 (Ye+, 2016)
J/A+A/600/A6 : NGC628 3.1GHz total intensity+polarised images (Mulcahy+, 2017)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1/4285] ID of the region
6- 12 F7.4 deg RAdeg Right ascension (J2000)
14- 20 F7.4 deg DEdeg Declination (J2000)
22- 32 F11.7 kpc Rg Galactocentric radius
34- 45 E12.6 [10-7W] logLHa ?=- Hα total luminosity
corrected for extinction
47- 58 E12.6 [mW/m2] logDIGsb ?=- Hα mean diffuse ionized
gaz background level
(in mW/m2/spaxel unit)
60 I1 --- Reg [1/4] Region category (1)
62- 72 E11.6 mW/m2 I0p Pseudo-Voigt profile parameter I0
74- 84 E11.6 mW/m2 Ap Pseudo-Voigt profile parameter Amp
86- 93 F8.4 pc sigp Pseudo-Voigt profile parameter
σ
95-105 E11.9 % alphap Pseudo-Voigt profile parameter
α
107-116 F10.8 --- R2p Pseudo-Voigt profile correlation
coefficient R2
118-125 F8.4 pc Size Size of the region
127-137 E11.9 mag E(B-V) ?=- Extinction
139-149 E11.9 mag e_E(B-V) ?=- Extinction error
151-161 F11.8 --- logNII/Ha ?=- log line ratio
[NII]6583/Hα
163-174 E12.8 --- e_logNII/Ha []?=- log line ratio
[NII]6583/Ha error
176-185 F10.6 --- SNR1 line ratio [NII]6583/Ha best SNR
187-198 F12.9 --- log[SII]/Ha ?=- log line ratio
[SII]6716+6731/Hα
200-211 F12.7 --- e_log[SII]/Ha []?=- log line ratio
[SII]6716+6731/Ha error
213-223 F11.7 --- SNR2 line ratio [SII]6716+6731/[NII]6583
best SNR
225-236 E12.9 --- log[SII]/[NII] ?=- log line ratio
[SII]6716+6731/[NII]6583
238-252 F15.8 --- e_log[SII]/[NII] []?=- log line ratio
[SII]6716+6731/[NII]6583 error
254-262 F9.6 --- SNR3 line ratio [SII]6716+6731/[NII]6583
best SNR
264-275 F12.9 --- log[OIII]/Hb ?=- log line ratio
[OIII]5007/Hβ
277-289 F13.8 --- e_log[OIII]/Hb []?=- log line ratio
[OIII]5007/Hb error
291-299 F9.6 --- SNR4 ?=- line ratio [OIII]5007/Hb
best SNR
301-312 E12.9 --- log[OII]3727/Hb ?=- log line ratio
[OI]3727/Hβ
314-324 E11.6 --- e_log[OII]3727/Hb []?=- log line ratio [OII]3727/Hb
error
326-334 F9.6 --- SNR5 ?=- line ratio [OII]3727/Hβ
best SNR
336-347 E12.9 --- log([OII]+[OIII])/Hb ?=- log line ratio
([OII]3727+[OIII]5007)/Hb
349-359 E11.7 --- e_log([OII]+[OIII])/Hb []?=- log line ratio
([OII]3727+[OIII]5007)/Hb error
361-369 F9.6 --- SNR6 ?=- line ratio
([OII]3727+[OIII]5007)/Hb best SNR
371-381 F11.8 --- log[OIII]/[OII] ?=- log line ratio
[OIII]5007/[OII]3727
383-394 E12.9 --- e_log[OIII]/[OII] []?=- log line ratio
[OIII]5007/[OII]3727 error
396-404 F9.6 --- SNR7 ?=- line ratio [OIII]5007/[OII]3727
best SNR
406-417 F12.9 --- log[OIII]/[NII] ?=- log line ratio
[OIII]5007/[[NII]6583
419-432 F14.8 --- e_log[OIII]/[NII] []?=- log line ratio
[OIII]5007/[[NII]6583 error
434-443 F10.7 --- SNR8 ?=- line ratio
[OIII]5007/[[NII]6583 best SNR
445-456 F12.9 --- log[OII]/[NII] ?=- log line ratio
[OII]3727/[NII]6583
458-468 E11.7 --- e_log[OII]/[NII] []?=- log line ratio
[OII]3727/[NII]6583 error
470-478 F9.6 --- SNR9 ?=- line ratio [OII]3727/[NII]6583
best SNR
480-493 F14.8 --- log[SII]16/[SII]31 ?=- log line ratio
[SII]6716/[SII]6731
495-509 F15.9 --- e_log[SII]16/[SII]31 []?=- log line ratio
[SII]6716/[SII]6731 error
511-520 F10.7 --- SNR10 line ratio [SII]6716/[SII]6731
best SNR
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Note (1): Category as follows:
1 = Symmetrical
2 = Asymmetrical
3 = Transient
4 = Diffuse
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(End) cat 2021-Jun-11
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Jun-2021