MegaCam: the new Canada-France-Hawaii Telescope wide-field imaging camera

Boulade, O.; Charlot, X.; Abbon, P.; Aune, S.; Borgeaud, P.; Carton, Pierre-Henri; Carty, M.; Costa, J. Da; Deschamps, H.; Desforge, D.; Eppelle, Dominique; Gallais, P.; Gösset, L.; Granelli, R.; Gros, M.; Kat, J. de; Loiseau, D.; Ritou, J. L.; Rousse, Jean Yves; Starzynski, P.; Vignal, N.; Vigroux, L.

doi:10.1117/12.459890

Cited by 228 publications

(29 citation statements)

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“…NGVS (Ferrarese et al 2012) is a deep imaging survey of 104deg 2 of the sky toward the Virgo Cluster (located at 16.5 Mpc distance; Mei et al 2007), carried out with the MegaCam wide-field imager on CFHT (Boulade et al 2003). In this article, we focus on the core region of the Virgo Cluster, an area of 3.62deg 2 roughly centered on M87 for which K s -band data have been obtained with the CFHT/WIRCam instrument as part of the NGVS-IR project (Muñoz et al 2014).…”

Section: Optical and Near-infrared Imagesmentioning

confidence: 99%

The Next Generation Virgo Cluster Survey (Ngvs). Xxv. Fiducial Panchromatic Colors of Virgo Core Globular Clusters and Their Comparison to Model Predictions

Powalka

Lançon

Puzia

et al. 2016

ApJS

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The central region of the Virgo Cluster of galaxies contains thousands of globular clusters (GCs), an order of magnitude more than the number of clusters found in the Local Group. Relics of early star formation epochs in the universe, these GCs also provide ideal targets to test our understanding of the spectral energy distributions (SEDs) of old stellar populations. Based on photometric data from the Next Generation Virgo Cluster Survey (NGVS) and its near-infrared counterpart NGVS-IR, we select a robust sample of »2000 GCs with excellent photometry and that span the full range of colors present in the Virgo core. The selection exploits the well-defined locus of GCs in the uiK diagram and the fact that the GCs are marginally resolved in the images. We show that the GCs define a narrow sequence in five-dimensional color space, with limited but real dispersion around the mean sequence. The comparison of these SEDs with the predictions of 11 widely used population synthesis models highlights differences between the models and also shows that no single model adequately matches the data in all colors. We discuss possible causes for some of these discrepancies. Forthcoming papers of this series will examine how best to estimate photometric metallicities in this context, and compare the Virgo GC colors with those in other environments.

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Section: Optical and Near-infrared Imagesmentioning

confidence: 99%

The Next Generation Virgo Cluster Survey (Ngvs). Xxv. Fiducial Panchromatic Colors of Virgo Core Globular Clusters and Their Comparison to Model Predictions

Powalka

Lançon

Puzia

et al. 2016

ApJS

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“…As mentioned, our primary SN discovery images came from the square-degree CFHT/MegaCam camera (Boulade et al 2003). MegaCam has one ∼2 week queue run per month, and we aimed for one epoch every queue run.…”

Section: Real-time Imaging Data Reductionmentioning

confidence: 99%

THE MULTI-EPOCH NEARBY CLUSTER SURVEY: TYPE Ia SUPERNOVA RATE MEASUREMENT INz∼ 0.1 CLUSTERS AND THE LATE-TIME DELAY TIME DISTRIBUTION

Sand

Graham

Bildfell

et al. 2012

ApJ

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We describe the Multi-Epoch Nearby Cluster Survey, designed to measure the cluster Type Ia supernova (SN Ia) rate in a sample of 57 X-ray selected galaxy clusters, with redshifts of 0.05 < z < 0.15. Utilizing our real-time analysis pipeline, we spectroscopically confirmed twenty-three cluster SNe Ia, four of which were intracluster events. Using our deep Canada-France-Hawaii Telescope/MegaCam imaging, we measured total stellar luminosities in each of our galaxy clusters, and we performed detailed supernova (SN) detection efficiency simulations. Bringing these ingredients together, we measure an overall cluster SN Ia rate within +0.005−0.004 SNuM). The red-sequence SN Ia rate is consistent with published rates in early-type/elliptical galaxies in the "field." Using our red-sequence SN Ia rate, and other cluster SN measurements in early-type galaxies up to z ∼ 1, we derive the late-time (>2 Gyr) delay time distribution (DTD) of SN Ia assuming a cluster early-type galaxy star formation epoch of z f = 3. Assuming a power-law form for the DTD, Ψ(t) ∝ t s , we find s = −1.62 ± 0.54. This result is consistent with predictions for the double degenerate SN Ia progenitor scenario (s ∼ −1) and is also in line with recent calculations for the double detonation explosion mechanism (s ∼ −2). The most recent calculations of the single degenerate scenario DTD predicts an order-of-magnitude drop-off in SN Ia rate ∼6-7 Gyr after stellar formation, and the observed cluster rates cannot rule this out.

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“…A 200 s i-band snapshot of each target was obtained at Canada-France-Hawaii Telescope (CFHT) with MegaCam (Boulade et al 2003). SIMP J1501−0135 was observed on 2006 July 20 with a seeing of 0.…”

Section: Megacam Photometrymentioning

confidence: 99%

Discovery of Two L and T Binaries With Wide Separations and Peculiar Photometric Properties

Artigau

Lafrenière

Doyon

et al. 2011

ApJ

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We present spatially resolved photometric and spectroscopic observations of two wide brown dwarf binaries uncovered by the Sondage Infrarouge de Mouvement Propre (SIMP) near-infrared proper motion survey. The first pair (SIMP J1619275+031350AB) has a separation of 0. 691 (15.2 AU) and components T2.5+T4.0, at the cooler end of the ill-understood J-band brightening. The system is unusual in that the earlier-type primary is bluer in J − K s than the later-type secondary, whereas the reverse is expected for binaries in the late-L to T dwarf range. This remarkable color reversal can possibly be explained by very different cloud properties between the two components. The second pair (SIMP J1501530−013506AB) consists of an L4.5+L5.5 (separation 0. 96, 30-47 AU) with a surprisingly large flux ratio (ΔJ = 1.79 mag) considering the similar spectral types of its components. The large flux ratio could be explained if the primary is itself an equal-luminosity binary, which would make it one of the first known triple brown dwarf systems. Adaptive optics observations could not confirm this hypothesis, but it remains a likely one, which may be verified by high-resolution near-infrared spectroscopy. These two systems add to the handful of known brown dwarf binaries amenable to resolved spectroscopy without the aid of adaptive optics and constitute prime targets to test brown dwarf atmosphere models.

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MegaCam: the new Canada-France-Hawaii Telescope wide-field imaging camera

Cited by 228 publications

References 0 publications

The Next Generation Virgo Cluster Survey (Ngvs). Xxv. Fiducial Panchromatic Colors of Virgo Core Globular Clusters and Their Comparison to Model Predictions

The Next Generation Virgo Cluster Survey (Ngvs). Xxv. Fiducial Panchromatic Colors of Virgo Core Globular Clusters and Their Comparison to Model Predictions

THE MULTI-EPOCH NEARBY CLUSTER SURVEY: TYPE Ia SUPERNOVA RATE MEASUREMENT INz∼ 0.1 CLUSTERS AND THE LATE-TIME DELAY TIME DISTRIBUTION

Discovery of Two L and T Binaries With Wide Separations and Peculiar Photometric Properties

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