VISTA: project status

McPherson, Alistair M.; Born, Andrew; Sutherland, William J.; Emerson, J. P.; Little, Bryan; Jeffers, Paul; Stewart, Malcolm; Murray, J. R.; Ward, Kim

doi:10.1117/12.671352

Cited by 117 publications

(121 citation statements)

References 6 publications

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“…This ESO public survey relies on the VIRCAM camera (Dalton et al 2006) of the ESO VISTA telescope (Emerson, McPherson & Sutherland 2006) to obtain deep NIR photometric data in the Y , J and Ks filters. The main aims are: i) to reconstruct the spatially-resolved star-formation history (SFH) and ii) to infer an accurate 3D map of the whole Magellanic system.…”

Section: Introductionmentioning

confidence: 99%

The VMC Survey – XIII. Type II Cepheids in the Large Magellanic Cloud★

Ripepi

Moretti

Marconi

et al. 2014

Monthly Notices of the Royal Astronomical Society

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The VISTA survey of the Magellanic Clouds System (VMC) is collecting deep K s -band time-series photometry of the pulsating variable stars hosted in the system formed by the two Magellanic Clouds and the Bridge connecting them. In this paper we have analysed a sample of 130 Large Magellanic Cloud (LMC) Type II Cepheids (T2CEPs) found in tiles with complete or near complete VMC observations for which identification and optical magnitudes were obtained from the OGLE III survey. We present J and K s light curves for all 130 pulsators, including 41 BL Her, 62 W Vir (12 pW Vir) and 27 RV Tau variables. We complement our near-infrared photometry with the V magnitudes from the OGLE III survey, allowing us to build a variety of PeriodLuminosity (P L), Period-Luminosity-Colour (P LC) and Period-Wesenheit (P W ) relationships, including any combination of the V, J, K s filters and valid for BL Her and W Vir classes. These relationships were calibrated in terms of the LMC distance modulus, while an independent absolute calibration of the P L(K s ) and the P W (K s , V ) was derived on the basis of distances obtained from Hubble Space T elescope parallaxes and Baade-Wesselink technique. When applied to the LMC and to the Galactic Globular Clusters hosting T2CEPs, these relations seem to show that: 1) the two population II standard candles RR Lyrae and T2CEPs give results in excellent agreement with each other; 2) there is a discrepancy of ∼0.1 mag between population II standard candles and Classical Cepheids when the distances are gauged in a similar way for all the quoted pulsators. However, given the uncertainties, this discrepancy is within the formal 1σ uncertainties.

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Section: Introductionmentioning

confidence: 99%

The VMC Survey – XIII. Type II Cepheids in the Large Magellanic Cloud★

Ripepi

Moretti

Marconi

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…To obtain optical, mid-IR, and far-IR photometry for the XMM-ATLAS sources, we cross-matched the X-ray catalogue with the SDSS-DR13 (Albareti et al 2015), the WISE (Wright et al 2010), and the VISTA-VIKING catalogues (Emerson et al 2006;Dalton et al 2006) with the ARCHES cross-correlation tool xmatch, which symmetrically matches an arbitrary number of catalogues providing a Bayesian probability of association or non-association (Pineau 2016). xmatch associates one or more tuples with each X-ray source, including possible counterparts in VISTA and/or WISE, with the corresponding probability.…”

Section: X-ray Samplementioning

confidence: 99%

Estimating photometric redshifts for X-ray sources in the X-ATLAS field using machine-learning techniques

Mountrichas

Corral

Masoura

et al. 2017

A&A

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We present photometric redshifts for 1031 X-ray sources in the X-ATLAS field using the machine-learning technique TPZ. X-ATLAS covers 7.1 deg 2 observed with XMM-Newton within the Science Demonstration Phase of the H-ATLAS field, making it one of the largest contiguous areas of the sky with both XMM-Newton and Herschel coverage. All of the sources have available SDSS photometry, while 810 additionally have mid-IR and/or near-IR photometry. A spectroscopic sample of 5157 sources primarily in the XMM/XXL field, but also from several X-ray surveys and the SDSS DR13 redshift catalogue, was used to train the algorithm. Our analysis reveals that the algorithm performs best when the sources are split, based on their optical morphology, into point-like and extended sources. Optical photometry alone is not enough to estimate accurate photometric redshifts, but the results greatly improve when at least mid-IR photometry is added in the training process. In particular, our measurements show that the estimated photometric redshifts for the X-ray sources of the training sample have a normalized absolute median deviation, nmad ≈ 0.06, and a percentage of outliers, η = 10-14%, depending upon whether the sources are extended or point like. Our final catalogue contains photometric redshifts for 933 out of the 1031 X-ray sources with a median redshift of 0.9.

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“…The survey was carried out with VISTA (Visual and Infrared Survey Telescope for Astronomy; Emerson et al 2006), which is the ESO 4.1 m telescope located on Cerro Paranal. This telescope is equipped with VIRCAM (VISTA InfraRed CAMera; Dalton et al 2006), which is a wide field near-infrared imager producing ∼1 × 1.5 deg 2 tiles 2 .…”

Section: Vvv Surveymentioning

confidence: 99%

Candidate star clusters toward the inner Milky Way discovered on deep-stackedK_S-band images from the VVV Survey

Ivanov

Piatti

Beamin

et al. 2017

A&A

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Context. The census of star clusters in the inner Milky Way is incomplete because of extinction and crowding. Aims. We embarked on a program to expand the star cluster list in the direction of the inner Milky Way using deep stacks of K S -band images from the VISTA Variables in Via Lactea (VVV) Survey. Methods. We applied an automated two-step procedure to the point-source catalog derived from the deep K S images: first, we identified overdensities of stars, and then we selected only candidate clusters with probable member stars that match an isochrone with a certain age, distance, and extinction on the color-magnitude diagram.Results. This pilot project only investigates the cluster population in part of one VVV tile, that is, b201. We identified nine cluster candidates and estimated their parameters. The new candidates are compact with a typical radius on the sky of ∼0.2-0.4 arcmin (∼0.4-1.6 pc at their estimated distances). They are located at distances of ∼5-14 kpc from the Sun and are subject to moderate extinction of E(B − V) = 0.4-1.0 mag. They are sparse, probably evolved, with typical ages log(t/1 yr) ∼9. Based on the locations of the objects inside the Milky Way, we conclude that one of these objects is probably associated with the disk or halo and the remaining objects are associated with the bulge or the halo. Conclusions. The cluster candidates reported here push the VVV Survey cluster detection to the limit. These new objects demonstrate that the VVV survey has the potential to identify thousands of additional cluster candidates. The sub-arcsec angular resolution and the near-infrared wavelength regimen give it a critical advantage over other surveys.

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VISTA: project status

Cited by 117 publications

References 6 publications

The VMC Survey – XIII. Type II Cepheids in the Large Magellanic Cloud★

The VMC Survey – XIII. Type II Cepheids in the Large Magellanic Cloud★

Estimating photometric redshifts for X-ray sources in the X-ATLAS field using machine-learning techniques

Candidate star clusters toward the inner Milky Way discovered on deep-stackedK_S-band images from the VVV Survey

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VISTA: project status

Cited by 117 publications

References 6 publications

The VMC Survey – XIII. Type II Cepheids in the Large Magellanic Cloud★

The VMC Survey – XIII. Type II Cepheids in the Large Magellanic Cloud★

Estimating photometric redshifts for X-ray sources in the X-ATLAS field using machine-learning techniques

Candidate star clusters toward the inner Milky Way discovered on deep-stackedKS-band images from the VVV Survey

Contact Info

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Candidate star clusters toward the inner Milky Way discovered on deep-stackedK_S-band images from the VVV Survey