René Pierre Martin
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View article: SIGNALS of Giant HII Regions: A Spatially Resolved Analysis of NGC 604
SIGNALS of Giant HII Regions: A Spatially Resolved Analysis of NGC 604 Open
Observing giant HII regions at fine spatial scales uncovers detailed structures and reveals variations in ionization, abundance, and dynamical properties of ionized gas and the effect of stellar feedback. Using emission line data of M33 ob…
View article: Ionized gas in NGC 4258: exploring the AGN–star formation connection
Ionized gas in NGC 4258: exploring the AGN–star formation connection Open
NGC 4258 is a prime target for studying feedback in low-luminosity active galactic nuclei (LLAGNs) due to its proximity and comprehensive multiwavelength coverage. Using new integral field spectroscopy (IFS) data from SITELLE at the Canada…
View article: Ionized gas in NGC 4258: Exploring the AGN -- Star formation connection
Ionized gas in NGC 4258: Exploring the AGN -- Star formation connection Open
NGC 4258 is a prime target for studying feedback in Low-Luminosity Active Galactic Nuclei (LLAGNs) due to its proximity and comprehensive multi-wavelength coverage. Using new Integral Field Spectroscopy (IFS) data from SITELLE at the Canad…
View article: SIGNALS on the mixing of oxygen and nitrogen in the spiral galaxy NGC 6946
SIGNALS on the mixing of oxygen and nitrogen in the spiral galaxy NGC 6946 Open
As part of the SIGNALS (Star formation, Ionized Gas, and Nebular Abundances Legacy Survey) survey, which comprises a sample of approximately 40 nearby galaxies observed with the Fourier transform spectrometer SITELLE, we present a study of…
View article: SIGNALS on the mixing of oxygen and nitrogen in the spiral galaxy NGC 6946
SIGNALS on the mixing of oxygen and nitrogen in the spiral galaxy NGC 6946 Open
As part of the SIGNALS survey, which comprises a sample of approximately 40 nearby galaxies observed with the Fourier transform spectrometer SITELLE, we present a study of metal mixing in the spiral galaxy NGC 6946. Taking advantage of the…
View article: NGC 628 in SIGNALS: Explaining the Abundance-ionization Correlation in H ii Regions
NGC 628 in SIGNALS: Explaining the Abundance-ionization Correlation in H ii Regions Open
The variations of oxygen abundance and ionization parameter in H ii regions are usually thought to be the dominant factors that produced variations seen in observed emission-line spectra. However, if and how these two quantities are physic…
View article: NGC 628 in SIGNALS: Explaining the Abundance-Ionization Correlation in HII Regions
NGC 628 in SIGNALS: Explaining the Abundance-Ionization Correlation in HII Regions Open
The variations of oxygen abundance and ionization parameter in HII regions are usually thought to be the dominant factors that produced variations seen in observed emission line spectra. However, if and how these two quantities are physica…
View article: Properties of supernova remnants in SIGNALS galaxies – I. NGC 6822 and M33
Properties of supernova remnants in SIGNALS galaxies – I. NGC 6822 and M33 Open
We present a spatially resolved study of the kinematical properties of known supernova remnants (SNRs) in the nearest galaxies of the SIGNALS survey, namely NGC 6822 (one object) and M33 (163 objects), based on data obtained with the SITEL…
View article: Properties of supernova remnants in SIGNALS galaxies -- I . NGC 6822 and M33
Properties of supernova remnants in SIGNALS galaxies -- I . NGC 6822 and M33 Open
We present a spatially resolved study of the kinematical properties of known supernova remnants (SNRs) in the nearest galaxies of the SIGNALS survey, namely NGC 6822 (one object) and M33 (163 objects), based on data obtained with the SITEL…
View article: Ring nebulae around Wolf-Rayet stars in M33 as seen by SITELLE
Ring nebulae around Wolf-Rayet stars in M33 as seen by SITELLE Open
We have conducted an analysis of nebulae around Wolf-Rayet (WR) stars in M33 using data collected by the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii telescope as part of the SIGNALS Large Program. Of the 211 …
View article: Ring nebulae around Wolf–Rayet stars in M33 as seen by SITELLE
Ring nebulae around Wolf–Rayet stars in M33 as seen by SITELLE Open
We have conducted an analysis of nebulae around Wolf–Rayet (WR) stars in M33 using data collected by the imaging Fourier transform spectrometer SITELLE at the Canada–France–Hawaii telescope as part of the SIGNALS Large Program. Of the 211 …
View article: Lithium-rich Cepheid V470 Cas
Lithium-rich Cepheid V470 Cas Open
Aims. In this Letter, we report the discovery of a new lithium-rich yellow supergiant star – the Cepheid V470 Cas – that has a high lithium abundance, log A (Li) = 3.29. This is highly unusual for supergiant stars. V470 Cas is joining a ve…
View article: Planetary nebulae and supernova remnants in NGC 4214 from the SIGNALS survey
Planetary nebulae and supernova remnants in NGC 4214 from the SIGNALS survey Open
Using datacubes from the imaging Fourier transform spectrometer SITELLE at the Canada–France–Hawaii Telescope as part of the star formation, ionized gas, and nebular abundances legacy survey, we identify 15 new planetary nebulae (PNe) as w…
View article: A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. III. Disentangling Multiple Components in H ii Regions
A Machine-learning Approach to Integral Field Unit Spectroscopy Observations. III. Disentangling Multiple Components in H ii Regions Open
In the first two papers of this series, we demonstrated the dynamism of machine learning applied to optical spectral analysis by using neural networks to extract kinematic parameters and emission-line ratios directly from the spectra obser…
View article: SIGNALS: I. Survey description
SIGNALS: I. Survey description Open
SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing programme designed to investigate massive star formation and H ii regions in a sample of local extended galaxies. The programme will use t…
View article: Elemental abundances in the center of the Galactic Nuclear Disc
Elemental abundances in the center of the Galactic Nuclear Disc Open
We have made the first attempt to derive the chemical properties of the Galactic disc at its very central part using high-resolution infrared spectroscopic observations of four classical Cepheids. Those stars are located at Galactocentric …
View article: O CAESAR: The Optical CAtalogue of Extragalactic SupernovA Remnants
O CAESAR: The Optical CAtalogue of Extragalactic SupernovA Remnants Open
We present O CAESAR, the Optical CAtalogue of Extragalactic SupernovA Remnants. O CAESAR will provide the largest homogeneous optical survey of extragalactic SNR candidates taken by the same telescope, the same instrument, and under simila…
View article: Elemental abundances in the centre of the Galactic nuclear disc
Elemental abundances in the centre of the Galactic nuclear disc Open
We have made the first attempt to derive the chemical properties of the Galactic disc at its very central part using high-resolution infrared spectroscopic observations of four classical Cepheids. These stars are located at Galactocentric …
View article: 3D optical spectroscopic study of NGC 3344 with SITELLE: I. Identification and confirmation of supernova remnants
3D optical spectroscopic study of NGC 3344 with SITELLE: I. Identification and confirmation of supernova remnants Open
We present the first optical identification and confirmation of a sample of supernova remnants (SNRs) in the nearby galaxy NGC 3344. Using high spectral and spatial resolution data, obtained with the CFHT imaging Fourier transform spectrog…
View article: SITELLE: an Imaging Fourier Transform Spectrometer for the Canada–France–Hawaii Telescope
SITELLE: an Imaging Fourier Transform Spectrometer for the Canada–France–Hawaii Telescope Open
We present an overview of SITELLE, an Imaging Fourier Transform Spectrometer\n(iFTS) available at the 3.6-meter Canada-France-Hawaii Telescope. SITELLE is a\nMichelson-type interferometer able to reconstruct the spectrum of every light\nso…
View article: NGC628 with SITELLE: I. Imaging spectroscopy of 4285 H ii region candidates
NGC628 with SITELLE: I. Imaging spectroscopy of 4285 H ii region candidates Open
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-Ima…
View article: Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc – II
Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc – II Open
We have derived the abundances of 36 chemical elements in one Cepheid star, ASAS 181024-2049.6, located RG = 2.53 kpc from the Galactic Centre. This star falls within a region of the inner thin disc poorly sampled in Cepheids. Our spectral…
View article: SITELLE at the CFHT
SITELLE at the CFHT Open
SITELLE is the new imaging Fourier transform spectrograph of the Canada-France-Hawaii Telescope. It produces an impressive 4 million spectra in a single datacube in selected bandpasses from 350 to 900 nm. Its large FOV (11′x11′) and its hi…