VISTA data flow system: overview

Emerson, J. P.; Irwin, M. J.; Lewis, Jim; Hodgkin, S. T.; Evans, D. W.; Bunclark, P.; McMahon, R. G.; Hambly, N. C.; Mann, Robert; Bond, I. A.; Sutorius, Eckhard; Read, M.; Williams, P. M.; Lawrence, A.; Stewart, Malcolm

doi:10.1117/12.551582

Cited by 52 publications

(12 citation statements)

References 10 publications

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“…One of the main scientific aims of the VHS survey is to search for high-redshift quasars, due to its deep and wide coverage. The work presented here uses an internal release of VHS data, processed by the Cambridge Astronomy Survey Unit (CASU; Emerson et al 2004) and covering observations taken from 2009 November to 2017 March (i.e ESO Period 84 to 98). We used the aperture corrected magnitude in a 2" diameter (apermag3) as it is the most reliable magnitude for point-source objects, giving the best signal-to-noise in typical seeing conditions.…”

Section: The Vista Hemisphere Surveymentioning

confidence: 99%

A new bright z = 6.82 quasar discovered with VISTA: VHS J0411–0907

Pons

McMahon

Simcoe

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present the discovery of a new z ∼ 6.8 quasar discovered with the near-IR VISTA Hemisphere Survey (VHS) which has been spectroscopically confirmed by the ESO New Technology Telescope (NTT) and the Magellan telescope. This quasar has been selected by spectral energy distribution (SED) classification using near infrared data from VISTA, optical data from Pan-STARRS, and mid-IR data from WISE. The SED classification algorithm is used to statistically rank two classes; foreground Galactic low-mass stars and high redshift quasars, prior to spectroscopic observation. Forced photometry on Pan-STARRS pixels for VHS J0411-0907 allows to improve the SED classification reduced-χ 2 and photometric redshift. VHS J0411-0907 (z = 6.82, y AB = 20.1 mag, J AB = 20.0 mag) has the brightest J-band continuum magnitude of the nine known quasars at z > 6.7 and is currently the highest redshift quasar detected in the Pan-STARRS survey. This quasar has one of the lowest black hole mass (M BH = (6.13 ± 0.51) × 10 8 M ) and the highest Eddington ratio (2.37 ± 0.22) of the known quasars at z > 6.5. The high Eddington ratio indicates that some very high-z quasars are undergoing super Eddington accretion. We also present coefficients of the best polynomials fits for colours vs spectral type on the Pan-STARRS, VISTA and WISE system for MLT dwarfs and present a forecast for the expected numbers of quasars at z > 6.5.

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Section: The Vista Hemisphere Surveymentioning

confidence: 99%

A new bright z = 6.82 quasar discovered with VISTA: VHS J0411–0907

Pons

McMahon

Simcoe

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…Combining a mosaic of six partially superimposed pawprint exposures results in a contiguous coverage of the so-called tile, an image of 1.64 deg 2 field of view (Saito et al 2011)). Images in Z, Y, J, H, and K s are processed and reduced using the VISTA Data Flow System (VDFS Emerson et al 2004;Irwin et al 2004), developed at the Cambridge Astronomical Survey Unit (CASU). VDFS also produces catalogues providing the positions of the objects detected, along with their aperture photometry.…”

Section: Observationsmentioning

confidence: 99%

The structure behind the Galactic bar traced by red clump stars in the VVV survey

Gonzalez

Minniti

Valenti

et al. 2018

Monthly Notices of the Royal Astronomical Society: Letters

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Red clump stars are commonly used to map the reddening and morphology of the inner regions of the Milky Way. We use the new photometric catalogues of the VISTA Variables in the Vía Láctea survey to achieve twice the spatial resolution of previous reddening maps for Galactic longitudes −10 • < l < 10 • and latitudes −1.5 • < b < 1.5 • . We use these de-reddened catalogues to construct the K s luminosity function around the red clump in the Galactic plane. We show that the secondary peak (fainter than the red clump) detected in these regions does not correspond to the bulge red-giant branch bump alone, as previously interpreted. Instead, this fainter clump corresponds largely to the over-density of red clump stars tracing the spiral arm structure behind the Galactic bar. This result suggests that studies aiming to characterise the bulge redgiant branch bump should avoid low galactic latitudes (|b| < 2 • ), where the background red clump population contributes significant contamination. It furthermore highlights the need to include this structural component in future modelling of the Galactic bar.

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“…Overviews of the further standard processing for all VISTA data that is done in the UK is given in Emerson et al 46,47 . The VDFS aims to deal with all VISTA data, regardless of origin, to ensure that instrumental effects and calibration use all the available information on the instrument, regardless of the program obtaining the data.…”

Section: The Generation Of Observation Blocks (Obs) For Vista Is Handmentioning

confidence: 99%

VISTA: status and performance

Emerson

Sutherland

2010

SPIE Proceedings

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VISTA, the Visible and Infrared Survey Telescope for Astronomy, is a 4-m class 1.65-degree wide field near-IR survey telescope with 0.34 arcsec pixels. VISTA was successfully commissioned and has been making surveys since 15 October 2009, and was formally accepted as a part of ESO's Cerro Paranal Observatory on 10 December 2009. We summarise the design and build process, report on commissioning and the as-built status. The most novel aspects of the system design have proved to all work well. We report the measured on-sky system performance that confirms that VISTA works as expected.

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VISTA data flow system: overview

Cited by 52 publications

References 10 publications

A new bright z = 6.82 quasar discovered with VISTA: VHS J0411–0907

A new bright z = 6.82 quasar discovered with VISTA: VHS J0411–0907

The structure behind the Galactic bar traced by red clump stars in the VVV survey

VISTA: status and performance

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