scispace - formally typeset
Search or ask a question
Author

Frederic Grandmont

Bio: Frederic Grandmont is an academic researcher from Laval University. The author has contributed to research in topics: Telescope & United States Space Surveillance Network. The author has an hindex of 2, co-authored 7 publications receiving 21 citations.

Papers
More filters
Proceedings ArticleDOI
TL;DR: SITELLE as mentioned in this paper is an Integral Field Unit (IFU) spectrograph capable of obtaining the visible spectrum of every pixel of a 2k x 2k CCD imaging a field of view of 11 x 11 arcminutes, with 100% spatial coverage and a spectral resolution ranging from R = 1 (deep panchromatic image) to R < 104 (for gas dynamics).
Abstract: We report here on the current status of SITELLE, an imaging Fourier transform spectrometer to be installed on the Canada-France Hawaii Telescope in 2013. SITELLE is an Integral Field Unit (IFU) spectrograph capable of obtaining the visible (350 nm – 900 nm) spectrum of every pixel of a 2k x 2k CCD imaging a field of view of 11 x 11 arcminutes, with 100% spatial coverage and a spectral resolution ranging from R = 1 (deep panchromatic image) to R < 104 (for gas dynamics). SITELLE will cover a field of view 100 to 1000 times larger than traditional IFUs, such as GMOS-IFU on Gemini or the upcoming MUSE on the VLT. SITELLE follows on the legacy of BEAR, an imaging conversion of the CFHT FTS and the direct successor of SpIOMM, a similar instrument attached to the 1.6-m telescope of the Observatoire du Mont-Megantic in Quebec. SITELLE will be used to study the structure and kinematics of HII regions and ejecta around evolved stars in the Milky Way, emission-line stars in clusters, abundances in nearby gas-rich galaxies, and the star formation rate in distant galaxies.

20 citations

Proceedings ArticleDOI
03 Feb 2003
TL;DR: An Imaging FTS has been designed and tested at the Megantic 1.6m telescope to produce astronomical cubes of data as discussed by the authors, which modulates light from 350 to 900 nm for a 1300X1340 CCD that images 12 arcminutes.
Abstract: An Imaging FTS has been designed and tested at Megantic 1.6m telescope to produce astronomical cubes of data. The interferometer modulates light from 350 to 900 nm for a 1300X1340 CCD that images 12 arcminutes.

2 citations

Proceedings ArticleDOI
23 Jun 2013
TL;DR: SITELLE as mentioned in this paper is a wide field imaging FTS to be deployed at the Canada-France-Hawaii telescope in late 2013, and its large size and high mass is a testimony of its uniquely large throughput for a visible range FTS.
Abstract: SITELLE is a wide field imaging FTS to be deployed at Canada-France-Hawaii telescope in late 2013. Its large size (few meters across) and high mass (half a ton) is a testimony of its uniquely large throughput for a visible range FTS. This paper presents preliminary characterization results of the instrument.

1 citations

Proceedings ArticleDOI
22 Apr 2020
TL;DR: The conclusion from this work contribute to the global effort in Space Situational Awareness (SSA) by assessing the impact of including space based optical imagery in the detection mix.
Abstract: The United States Space Surveillance Network catalogs around 23,000 Resident Space Objects (RSOs). The completeness of their coverage of the true RSO population decreases gradually with object size and radar reflectivity. While the population of cm level space debris is poorly represented in the catalogs these space bullets can cause severe damage to satellites and spacecrafts in addition to being likely much more numerous than larger pieces. This research project focuses on the ability to peek into this debris population using space-based high sensitivity, fast frame rate, wide field visible imaging from low Earth orbit. The simulator developed focuses on a LEO to LEO (sensor to RSO) scenario and the capacity to constrain their orbit trajectory. In the Matlab simulator, a simple specular/diffuse sphere model is used for the debris in order to generate the object’s apparent magnitude for any sun-debris-observer arrangement. Satellite and debris relative velocities and orbits are also considered in order to determine the length of the streak left by the debris on any given exposure sequence and the number of photons per pixel. The exact timing, position, length and orientation of the streak contains information constraining the object’s orbit. The generation of representative star backgrounds matched to the sensor high sensitivity is also an important part of the simulator since it affects the effective limiting sensitivity to faint transiting source. This simulator allows us to trade various sensor parameters in order to optimize the camera design. The conclusion from this work contribute to the global effort in Space Situational Awareness (SSA) by assessing the impact of including space based optical imagery in the detection mix.

1 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: The LaZy-IFU toolkit as mentioned in this paper is a toolkit for fitting multiple emission lines simultaneously in integral field spectroscopy (IFS) data, which is useful for the investigation of the dynamical, physical and chemical properties of gas in galaxies.
Abstract: We present lzifu (LaZy-IFU), an idl toolkit for fitting multiple emission lines simultaneously in integral field spectroscopy (IFS) data. lzifu is useful for the investigation of the dynamical, physical and chemical properties of gas in galaxies. lzifu has already been applied to many world-class IFS instruments and large IFS surveys, including the Wide Field Spectrograph, the new Multi Unit Spectroscopic Explorer (MUSE), the Calar Alto Legacy Integral Field Area (CALIFA) survey, the Sydney-Australian-astronomical-observatory Multi-object Integral-field spectrograph (SAMI) Galaxy Survey. Here we describe in detail the structure of the toolkit, and how the line fluxes and flux uncertainties are determined, including the possibility of having multiple distinct kinematic components. We quantify the performance of lzifu, demonstrating its accuracy and robustness. We also show examples of applying lzifu to CALIFA and SAMI data to construct emission line and kinematic maps, and investigate complex, skewed line profiles presented in IFS data. The code is made available to the astronomy community through github. lzifu will be further developed over time to other IFS instruments, and to provide even more accurate line and uncertainty estimates.

87 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the Gemini Multi-Object Spectrograph (GMS) to study the ionization properties and energetics of AGN-driven outflows and found strong evidence that connect the extreme kinematics of the ionized gas with the AGN photoionization.
Abstract: Outflows have been shown to be prevalent in galaxies hosting luminous active galactic nuclei (AGNs) and present a physically plausible way to couple the AGN energy output with the interstellar medium of their hosts. Despite their prevalence, accurate characterization of these outflows has been challenging. In the second of a series of papers, we use Gemini Multi-Object Spectrograph IFU data of 6 local (z<0.1) and moderate-luminosity Type 2 AGNs to study the ionization properties and energetics of AGN-driven outflows. We find strong evidence that connect the extreme kinematics of the ionized gas with the AGN photoionization. The kinematic component related to the AGN-driven outflow is clearly separated from other kinematic components, such as virial motions or rotation, on the velocity and velocity dispersion diagram. Our spatially resolved kinematic analysis reveals that from 30% up to 90% of the total mass and kinetic energy of the outflow is contained within the central kpc of the galaxy. The spatially integrated mass and kinetic energy of the gas entrained in the outflow correlates well with the AGN bolometric luminosity and results in energy conversion efficiencies between 0.01% and 1%. Intriguingly, we detect ubiquitous signs of ongoing circumnuclear star formation. Their small size, the centrally contained mass and energy, and the universally detected circumnuclear star formation cast doubts on the potency of these AGN-driven outflows as agents of galaxy-scale negative feedback.

63 citations

Journal ArticleDOI
TL;DR: SITELLE as discussed by the authors 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).
Abstract: 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 seeing-limited and sampled at 0.32 arcsec 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] $\lambda\lambda$ 3726,29 doublet in Orion and to reach R = 9500 around H-alpha; to detect diffuse emission at a level of 4 x 10e-17 erg/cm2/s/arcsec2; 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.

38 citations

Journal ArticleDOI
TL;DR: In this article, the authors introduce the working principle of scanning Fabry-Perot and Fourier transform spectrometers and explain the most common integral field concepts based on mirror slicers, lenslet arrays, and fibers.
Abstract: Imaging spectroscopy has seen rapid progress over the past 25 years, leading to breakthroughs in many fields of astronomy that would not have been otherwise possible. This review overviews the visible/infrared imaging spectroscopy techniques as well as energy-resolving detectors. We introduce the working principle of scanning Fabry-Perot and Fourier transform spectrometers and explain the most common integral field concepts based on mirror slicers, lenslet arrays, and fibers. The main advantage of integral field spectrographs is the simultaneous measurement of spatial and spectral information. Although Fabry-Perot and Fourier transform spectrometers can provide a larger field of view, it is ultimately the higher sensitivity of integral field units that make them the technique of choice. This is arguably the case for image slicers, which make the most efficient use of the available detector pixels and have equal or higher transmission than lenslet arrays and fiber integral field units, respectively. We als...

15 citations