A SITELLE view of M31’s central region – I. Calibrations and radial velocity catalogue of nearly 800 emission-line point-like sources

Martin, Thomas; Drissen, Laurent; Melchior, A. L.

doi:10.1093/mnras/stx2513

Cited by 30 publications

(40 citation statements)

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“…The uncertainty on the measurements depends on the SNR and the proper selection of the line model (sinc or sinc+Gaussian) and the set of lines to be fitted for each pixel (all lines must be fitted simultaneously, and if multiple components are present, they must be fitted simultaneously as well). As also described in Martin et al (2018), the precision on the velocity obtained over the planetary nebulae in M31 ranged from 2 to 6 km s −1 for sources of surface brightness much lower than what is expected for most H II regions.…”

Section: Data Reduction and Calibrationsmentioning

confidence: 69%

“…As they come out of the reduction pipeline, datacubes have a pixel-to-pixel velocity error estimated to be of the order of 0.1 km s −1 at R = 5000. Additional correction is applied to the absolute wavelength calibration using the skylines centroid map as described in Martin et al (2018) resulting in an accuracy of ∼1 km s −1 on the measured relative velocities across the FOV (see appendix B of Martin et al 2016 for details).…”

Section: Data Reduction and Calibrationsmentioning

confidence: 99%

“…The rich SIGNALS dataset will be valuable for investigating other complementary astrophysical topics. Some possibilities include: 1) planetary nebula abundance distributions and luminosity functions (Kreckel et al 2017;Martin et al 2018); 2) supernova remnant ionization conditions, occurrence, and feedback contribution (Moumen et al 2019); 3) detection of background emission line objects (e.g. [O II] and Ly-α emitters); and 4) large-scale velocity mapping of galaxies.…”

Section: Legacy Valuementioning

confidence: 99%

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SIGNALS: I. Survey description

Rousseau-Nepton

Martin

Robert

et al. 2019

Monthly Notices of the Royal Astronomical Society

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SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing program designed to investigate massive star formation and H II regions in a sample of local extended galaxies. The program will use the imaging Fourier transform spectrograph SITELLE at the Canada-France-Hawaii Telescope. Over 355 hours (54.7 nights) have been allocated beginning in fall 2018 for eight consecutive semesters. Once completed, SIGNALS will provide a statistically reliable laboratory to investigate massive star formation, including over 50 000 resolved H II regions : the largest, most complete, and homogeneous database of spectroscopically and spatially resolved extragalactic H II regions ever assembled. For each field observed, three datacubes covering the spectral bands of the filters SN1 (363 -386 nm), SN2 (482 -513 nm), and SN3 (647 -685 nm) are gathered. The spectral resolution selected for each spectral band is 1000, 1000, and 5000, respectively. As defined, the project sample will facilitate the study of small-scale nebular physics and many other phenomena linked to star formation at a mean spatial resolution of ∼20 pc. This survey also has considerable legacy value for additional topics including planetary nebulae, diffuse ionized gas, and supernova remnants. The purpose of this paper is to present a general outlook of the survey, notably the observing strategy, galaxy sample, and science requirements.

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Section: Data Reduction and Calibrationsmentioning

confidence: 69%

Section: Data Reduction and Calibrationsmentioning

confidence: 99%

Section: Legacy Valuementioning

confidence: 99%

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SIGNALS: I. Survey description

Rousseau-Nepton

Martin

Robert

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…Given the size of the spectral datacubes (up to 34 Go), the unusual instrumental line shape (ILS), and the very large number of spectra to analyze, a specific data analysis library (ORCS) has been developed to help the user to handle SITELLE's datacube. Different tools are proposed which have already been used for the analysis of different astrophysical objects (Shara et al 2017;Martin et al 2016Martin et al , 2018Gendron-Marsolais et al 2018;Rousseau-Nepton et al 2018); they include:…”

Section: Discussionmentioning

confidence: 99%

“…A typical example of the atmospheric transmission function measured during the acquisition of a datacube on the center of M31 observed through the SN3 filter is reproduced in Figure 5. This trans- Martin et al 2018). The computed transmission is normalized to its 99th percentile.…”

Section: Data Reductionmentioning

confidence: 99%

SITELLE: an Imaging Fourier Transform Spectrometer for the Canada–France–Hawaii Telescope

Drissen

Martin

Rousseau-Nepton

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present an overview of SITELLE, an Imaging Fourier Transform Spectrometer (iFTS) available at the 3.6-meter Canada-France-Hawaii Telescope. SITELLE is a Michelson-type interferometer able to reconstruct the spectrum of every light source within its 11 field of view in filter-selected bands of the visible (350 to 900 nm). The spectral resolution can be adjusted up to R = 10 000 and the spatial resolution is seeinglimited and sampled at 0.32 per pixel. We describe the design of the instrument as well as the data reduction and analysis process. To illustrate SITELLE's capabilities, we present some of the data obtained during and since the August 2015 commissioning run. In particular, we demonstrate its ability to separate the components of the [OII] λλ 3726,29 doublet in Orion and to reach R = 9500 around Hα; to detect diffuse emission at a level of 4 × 10 −17 erg cm −2 s −1 arcsec −2 ; to obtain integrated spectra of stellar absorption lines in galaxies despite the well-known multiplex disadvantage of the iFTS; and to detect emission-line galaxies at different redshifts.

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A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE)

Boselli

Fossati

Ferrarese

et al. 2018

A&A

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The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band (NB) Hα+[NII] imaging survey carried out with MegaCam at the Canada–France–Hawaii Telescope. The survey covers the whole Virgo cluster region from its core to one virial radius (104 deg2). The sensitivity of the survey is of f(Hα) ~ 4 × 10−17 erg s−1 cm−2 (5σ detection limit) for point sources and Σ(Hα) ~ 2 × 10−18 erg s−1 cm−2 arcsec−2 (1σ detection limit at 3 arcsec resolution) for extended sources, making VESTIGE the deepest and largest blind NB survey of a nearby cluster. This paper presents the survey in all its technical aspects, including the survey design, the observing strategy, the achieved sensitivity in both the NB Hα+[NII] and in the broad-band r filter used for the stellar continuum subtraction, the data reduction, calibration, and products, as well as its status after the first observing semester. We briefly describe the Hα properties of galaxies located in a 4 × 1 deg2 strip in the core of the cluster north of M87, where several extended tails of ionised gas are detected. This paper also lists the main scientific motivations for VESTIGE, which include the study of the effects of the environment on galaxy evolution, the fate of the stripped gas in cluster objects, the star formation process in nearby galaxies of different type and stellar mass, the determination of the Hα luminosity function and of the Hα scaling relations down to ~106 M⊙ stellar mass objects, and the reconstruction of the dynamical structure of the Virgo cluster. This unique set of data will also be used to study the HII luminosity function in hundreds of galaxies, the diffuse Hα+[NII] emission of the Milky Way at high Galactic latitude, and the properties of emission line galaxies at high redshift.

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A SITELLE view of M31’s central region – I. Calibrations and radial velocity catalogue of nearly 800 emission-line point-like sources

Cited by 30 publications

References 32 publications

SIGNALS: I. Survey description

SIGNALS: I. Survey description

SITELLE: an Imaging Fourier Transform Spectrometer for the Canada–France–Hawaii Telescope

A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE)

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