A5017013201- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- Neutrino Physics Research
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Remote Sensing in Agriculture
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Impact of Light on Environment and Health
- Geophysics and Gravity Measurements
- Spectroscopy and Chemometric Analyses
Institute of Nuclear Physics of Lyon
2015-2025
Institut de Physique des 2 Infinis de Lyon
2019-2025
Centre National de la Recherche Scientifique
2015-2025
Université Claude Bernard Lyon 1
2015-2025
Institut National de Physique Nucléaire et de Physique des Particules
2011-2022
Lyon College
2004-2022
Institut de Physique
2008-2020
SmartFactory (Germany)
2007
Centre de Recherche Astrophysique de Lyon
2000-2004
Leiden Observatory
2000-2004
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we an overview organization project summarize features in package, recent major release, version 2.0. We then describe infrastructure designed facilitate support a broader ecosystem...
We present new techniques to perform adaptive spatial binning of Integral-Field Spectroscopic (IFS) data reach a chosen constant signal-to-noise ratio per bin. These methods are required for the proper analysis IFS observations, but can also be used standard photometric imagery or any other two-dimensional data. Various schemes tested and compared by extracting stellar kinematics Sa galaxy NGC2273 from spectra obtained with panoramic SAURON.
Early results are reported from the SAURON survey of kinematics and stellar populations a representative sample nearby E, S0 Sa galaxies. The is aimed at determining intrinsic shape galaxies, their orbital structure, mass-to-light ratio as function radius, age metallicity populations, frequency kinematically decoupled cores nuclear black holes. construction described, its properties illustrated. A comparison with long-slit spectroscopic data establishes that measurements comparable to, or...
We present a generalisation of surface photometry to the higher-order moments line-of-sight velocity distribution galaxies observed with integral-field spectrographs. The follows approach by determining best fitting ellipses along which profiles can be extracted and analysed means harmonic expansion. assumption for odd (e.g. mean velocity) is that profile an ellipse satisfies simple cosine law. even (e.g dispersion) constant, as it used in photometry. find early-type are well represented law...
A new integral-field spectrograph, SAURON, is described. It based on the TIGER principle, and uses a lenslet array. SAURON has large field of view high throughput, allows simultaneous sky subtraction. Its design optimized for studies stellar kinematics, gas line-strength distributions nearby early-type galaxies. The instrument specifications are described, as well extensive analysis software which was developed to obtain fully calibrated spectra, associated kinematic measurements. companion...
We present the stellar kinematics of 48 representative elliptical and lenticular galaxies obtained with our custom-built integral-field spectrograph SAURON operating on William Herschel Telescope. The data were homogeneously processed through a dedicated reduction analysis pipeline. All resulting cubes spatially binned to constant minimum signal-to-noise ratio. have measured an optimized (penalized pixel-fitting) routine which fits spectra in pixel space, via use optimal templates, prevents...
We present photometric and spectroscopic observations of SN 2007if, an overluminous (MV = −20.4), red (B − V 0.16 at B-band maximum), slow-rising (trise 24 days) type Ia supernova (SN Ia) in a very faint (Mg −14.10) host galaxy. A spectrum 5 days past maximum light is direct match to the super-Chandrasekhar-mass candidate 2003fg, showing Si ii C ∼9000 km s−1. high signal-to-noise co-addition spectral time series reveals no Na i D absorption, suggesting negligible reddening galaxy, late-time...
The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct expansion history Universe growth cosmic structures. Estimation expected performance experiment, in terms predicted constraints on cosmological parameters, has so far relied different methodologies numerical implementations, developed for observational probes their combination. In this paper we present validated forecasts, that combine both theoretical expertise probes. This is presented provide...
Euclid is an ESA mission designed to constrain the properties of dark energy and gravity via weak gravitational lensing galaxy clustering. It will carry out a wide area imaging spectroscopy survey (EWS) in visible near-infrared, covering roughly 15,000 square degrees extragalactic sky on six years. The wide-field telescope instruments are optimized for pristine PSF reduced straylight, producing very crisp images. This paper presents building reference survey: sequence pointings EWS, Deep...
Previously we used the Nearby Supernova Factory sample to show that Type Ia supernovae (SNe Ia) having locally star-forming environments are dimmer than SNe passive environments. Here use Constitution together with host galaxy data from GALEX independently confirm result. The effect is seen using both SALT2 and MLCS2k2 lightcurve fitting standardization methods, brightness differences of 0.094 ± 0.037 mag for 0.155 0.041 RV = 2.5. When combined our previous measurement 0.025 SALT2. If ratio...
As part of an on-going effort to identify, understand and correct for astrophysics biases in the standardization Type Ia supernovae (SNIa) cosmology, we have statistically classified a large sample nearby SNeIa into those located predominantly younger or older environments. This classification is based on specific star formation rate measured within projected distance 1kpc from each SN location (LsSFR). important refinement compared using local directly as it provides normalization relative...
We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), fast and accurate predictor for nonlinear correction matter power spectrum. Percent-level emulation is now supported in eight-dimensional parameter space $w_0w_a$CDM$+\sum m_\nu$models between redshift $z=0$ $z=3$ spatial scales within range 0.01 $h$/Mpc $\leq k \leq$ 10 $h$/Mpc. In order to achieve this level accuracy, we have had improve quality underlying N-body simulations used as training data: (1) use...
The Near-Infrared Spectrometer and Photometer (NISP) on board the Euclid satellite provides multiband photometry R>=450 slitless grism spectroscopy in 950-2020nm wavelength range. In this reference article we illuminate background of NISP's functional calibration requirements, describe instrument's integral components, provide all its key properties. We also sketch processes needed to understand how NISP operates is calibrated, technical potentials limitations. Links articles providing more...
Context. As type Ia supernova cosmology transitions from a statistics-dominated to systematics-dominated era, it is crucial understand the remaining unexplained uncertainties that affect their luminosity, such as those stemming astrophysical biases. Type supernovae are standardisable candles whose absolute magnitude reaches scatter of typically 0.15 mag when empirical correlations with light-curve stretch and colour environmental properties accounted for. Aims. We investigate dependence...
Context. Type Ia supernova (SN Ia) cosmology studies will soon be dominated by systematic, uncertainties, rather than statistical ones. Thus, it is crucial to understand the unknown phenomena potentially affecting their luminosity that may remain, such as astrophysical biases. For accurate application in studies, SN magnitudes need standardised; namely, they must corrected for correlation with light-curve width and colour. Aims. Here, we investigate how standardisation procedure used reduce...
will provide deep near-infrared (NIR) imaging to ∼26.5 AB magnitude over ∼59 deg^2 in its and auxiliary fields. The Cosmic DAWN survey combines dedicated archival UV--NIR observations matched depth multiwavelength of the consistently measured NIR-selected photometric catalogues, accurate redshifts, measurements galaxy properties a redshift z∼ 10. catalogues include Spitzer IRAC data that are critical for stellar mass at z ≳ 2.5 high-z science. These complement standard which not data. In...
We present a study of the Type IIn supernova (SN) 2005gl, in relatively nearby (d ≈ 66 Mpc) galaxy NGC 266. Photometry and spectroscopy SN indicate that it is typical member its class. Pre-explosion Hubble Space Telescope (HST) imaging location SN, along with precise localization this event using laser guide star assisted adaptive optics (LGS-AO) system at Keck Observatory, are combined to identify luminous (MV = -10.3 mag) point source as possible progenitor 2005gl. If indeed single star,...
The Nearby Supernova Factory (<i>Snfactory</i>) is an international experiment designed to lay the foundation for next generation of cosmology experiments (such as <i>CFHTLS</i>, <i>w</i>P, <i>SNAP</i> and <i>LSST</i>) which will measure expansion history Universe using Type Ia supernovae. <i>Snfactory</i> discover obtain frequent lightcurve spectrophotometry covering 3200-10000Å roughly 300 supernovae at low-redshift end smooth Hubble flow. quantity, quality, breadth galactic...
We report Nearby Supernova Factory observations of SN 2005gj, the second confirmed case a "hybrid" Type Ia/IIn supernova. Our early-phase photometry 2005gj shows that interaction is much stronger than for prototype, 2002ic. first spectrum hot continuum with broad and narrow H-alpha emission. Later spectra, spanning over 4 months from outburst, show clear Ia features combined H-gamma, H-beta, HeI 5876,7065 in At higher resolution, P Cygni profiles are apparent. Surprisingly, we also observe...
The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations used constrain explosion scenarios. We base our discussion on three-dimensional simulations a delayed detonation Chandrasekhar-mass white dwarf violent merger two dwarfs-realizations models appropriate most...
We present 32 epochs of optical (3300-9700 \AA) spectrophotometric observations the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in galaxy M101, extending from -15 to +97 d with respect B-band maximum, obtained by Nearby Supernova Factory collaboration. is closest (\mu = 29.04) and brightest (Bmax 9.94 mag) observed since advent modern large scale programs for intensive periodic followup supernovae. Both synthetic light curve measurements spectral feature analysis...
We examine the relationship between Type Ia supernova (SN Ia) Hubble residuals and properties of their host galaxies using a sample 115 SNe from Nearby Supernova Factory. use galaxy stellar masses specific star formation rates fitted photometry for all hosts, as well gas-phase metallicities subset 69 star-forming (non-active galactic nucleus) to show that SN correlate with each these properties. With data we find new evidence correlation intrinsic color metallicity. When combine our those...
We present a sample of normal Type Ia supernovae (SNe Ia) from the Nearby Supernova Factory data set with spectrophotometry at sufficiently late phases to estimate ejected mass using bolometric light curve. measure 56Ni masses peak luminosity, then compare luminosity in 56Co-decay tail expected rate radioactive energy release ejecta given mass. infer Bayesian context semi-analytic model ejecta, incorporating constraints contemporary numerical models as priors on density structure and...
Current time domain facilities are discovering hundreds of new galactic and extra-galactic transients every week. Classifying the ever-increasing number is challenging, yet crucial to further our understanding their nature, discover classes, or ensuring sample purity, for instance, Supernova Ia cosmology. The Zwicky Transient Facility one example such a survey. In addition, it has dedicated very-low resolution spectrograph, SEDMachine, operating on Palomar 60-inch telescope. This...
(Abridged) We study the host galaxy regions in close proximity to Type Ia supernovae (SNe Ia) analyze relations between properties of SN events and environments most similar where their progenitors formed. focus on local H\alpha\ emission as an indicator young environments. The Nearby Supernova Factory has obtained flux-calibrated spectral timeseries for SNe using integral field spectroscopy, allowing simultaneous measurement its immediate vicinity. For 89 we measure tracing ongoing star...