The VLT‐VIRMOS Mask Manufacturing Unit

Conti, G.; Mattaini, E.; Chiappetti, L.; Maccagni, D.; Santambrogio, E.; Bottini, D.; Garilli, B.; Fèvre, O. Le; Saïsse, M.; Voet, Clothaire; Caputi, O.; Cascone, E.; Mancini, D.; Mancini, Guido; Perrotta, Francesco; Schipani, P.; Vettolani, G.

doi:10.1086/319548

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…ADPs contain the positions, length and width of all slits to be observed, produced using the VIMOS internal transformation matrix from the mask focal plane to the CCD focal plane to transform the coordinates of any VVDS source in the photometric catalog to VIMOS mask coordinates. The ADPs are then sent to the Mask Manufacturing Machine (MMU, Conti et al 2001) for the masks to be cut and stored in the VIMOS "mask cabinets" ready for observation. Database handling of objects already targeted ensures no duplication of observations in overlapping areas of adjacent pointings.…”

Section: Preparation Of Vimos Observations: Vmmps and Database Toolsmentioning

confidence: 99%

The VIMOS VLT deep survey

Fèvre¹,

Vettolani

Garilli

et al. 2005

A&A

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610

525

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This paper presents the "First Epoch" sample from the VIMOS VLT Deep Survey (VVDS). The VVDS goals, observations, data reduction with the VIPGI pipeline and redshift measurement scheme with KBRED are discussed. Data have been obtained with the VIsible Multi Object Spectrograph (VIMOS) on the ESO-VLT UT3, allowing us to observe 600 slits simultaneously at a spectral resolution R 230. A total of 11 564 objects have been observed in the VVDS-02h and VVDS-CDFS "Deep" fields over a total area of 0.61 deg 2 , selected solely on the basis of apparent magnitude 17.5 ≤ I AB ≤ 24. The VVDS efficiently covers the redshift range 0 < z ≤ 5. It is successfully going through the "redshift desert" 1.5 < z < 2.2, while the range 2.2 < z < 2.7 remains of difficult access because of the VVDS wavelength coverage. A total of 9677 galaxies have a redshift measurement, 836 objects are stars, 90 objects are AGN, and a redshift could not be measured for 961 objects. There are 1065 galaxies with a measured redshift z ≥ 1.4. When considering only the primary spectroscopic targets, the survey reaches a redshift measurement completeness of 78% overall (93% including less reliable flag 1 objects), with a spatial sampling of the population of galaxies of ∼25% and ∼30% in the VVDS-02h and VVDS-CDFS respectively. The redshift accuracy measured from repeated observations with VIMOS and comparison to other surveys is ∼276 km s −1. From this sample we are able to present for the first time the redshift distribution of a magnitude-limited spectroscopic sample down to I AB = 24. The redshift distribution N(z) has a median of z = 0.62, z = 0.65, z = 0.70, and z = 0.76, for magnitudelimited samples with I AB ≤ 22.5, 23.0, 23.5 and 24.0 respectively. A high redshift tail above redshift 2 and up to redshift 5 becomes readily apparent for I AB > 23.5, probing the bright star-forming population of galaxies. This sample provides an unprecedented dataset to study galaxy evolution over ∼90% of the life of the universe.

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Section: Preparation Of Vimos Observations: Vmmps and Database Toolsmentioning

confidence: 99%

The VIMOS VLT deep survey

Fèvre¹,

Vettolani

Garilli

et al. 2005

A&A

Self Cite

610

525

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“…The VMMPS code was then run on the EIS catalog for all sources brighter than I AB = 24 to optimize the number and positions of slits for each of the 4 masks per pointing. Masks have been cut by ESO Paranal Staff using the Mask Manufacturing Unit (Conti et al 2001). …”

Section: Mask Preparationmentioning

confidence: 99%

The VIMOS VLT Deep Survey

Fèvre¹,

Vettolani²,

Paltani³

et al. 2004

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Abstract. This paper presents the VIMOS VLT Deep Survey around the Chandra Deep Field South (CDFS). We have measured 1599 new redshifts with VIMOS on the European Observatory Very Large Telescope -UT3, in an area 21 × 21.6 arcmin 2 , including 784 redshifts in the Hubble Space Telescope -Advanced Camera for Surveys GOODS area. 30% of all objects with I AB = 24 have been observed independently of magnitude, indicating that the sample is purely magnitude limited. We have reached an unprecedented completeness level of 84% in terms of the ratio of secure measurements vs. observed objects, while 95% of all objects have a redshift measurement. A total of 1452 galaxies, 139 stars, 8 QSOs have a redshift identification, 141 of these being unsecure measurements. The redshift distribution down to I AB = 24 is peaked at a median redshift z = 0.73, with a significant high redshift tail extending up to ∼4. Several high density peaks in the distribution of galaxies are identified. In particular, the strong peak at z = 0.735 contains more than 130 galaxies in a velocity range ±2000 km s −1 distributed all across the transverse ∼20 h −1 Mpc of the survey. We are releasing all redshifts to the community, along with the cross identification with HST-ACS GOODS sources on the CENCOS database environment http://cencosw.oamp.fr.

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“…Multislit masks are cut in Invar sheets to excellent accuracy (a few microns, less than one hundredth of an arcsecond) using a dedicated laser machine (Conti et al 2001). Besides the total spectrograph throughput, the ability to observe faint targets relies heavily on the sky signal-subtraction accuracy.…”

Section: Vimos On the Vltmentioning

confidence: 99%

The VIMOS VLT Deep Survey final data release: a spectroscopic sample of 35 016 galaxies and AGN out toz~ 6.7 selected with 17.5 ≤i_AB ≤ 24.75

Fèvre

Cassata

Cucciati

et al. 2013

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Context. Deep representative surveys of galaxies at different epochs are needed to make progress in understanding galaxy evolution. Aims. We describe the completed VIMOS VLT Deep Survey and the final data release of 35 016 galaxies and type-I AGN with measured spectroscopic redshifts covering all epochs up to redshift z ∼ 6.7, in areas from 0.142 to 8.7 square degrees, and volumes from 0.5×10 6 to 2×10 7 h −3 Mpc 3 . Methods. We selected samples of galaxies based solely on their i-band magnitude reaching i AB = 24.75. Spectra were obtained with VIMOS on the ESO-VLT integrating 0.75 h, 4.5 h, and 18 h for the Wide, Deep, and Ultra-Deep nested surveys, respectively. We demonstrate that any "redshift desert" can be crossed successfully using spectra covering 3650 ≤ λ ≤ 9350 Å. A total of 1263 galaxies were again observed independently within the VVDS and from the VIPERS and MASSIV surveys. They were used to establish the redshift measurements reliability, to assess completeness in the VVDS sample, and to provide a weighting scheme taking the survey selection function into account. We describe the main properties of the VVDS samples, and the VVDS is compared to other spectroscopic surveys in the literature. Results. In total we have obtained spectroscopic redshifts for 34 594 galaxies, 422 type-I AGN, and 12 430 Galactic stars. The survey enabled identifying galaxies up to very high redshifts with 4669 redshifts in 1 ≤ z spec ≤ 2, 561 in 2 ≤ z spec ≤ 3, and 468 with z spec > 3, and specific populations like Lyman-α emitters were identified out to z = 6.62. We show that the VVDS occupies a unique place in the parameter space defined by area, depth, redshift coverage, and number of spectra. Conclusions. The VIMOS VLT Deep Survey provides a comprehensive survey of the distant universe, covering all epochs since z ∼ 6, or more than 12 Gyr of cosmic time, with a uniform selection, which is the largest such sample to date. A wealth of science results derived from the VVDS have shed new light on the evolution of galaxies and AGN and on their distribution in space over this large cosmic time. The VVDS further demonstrates that large deep spectroscopic redshift surveys over all these epochs in the distant Universe are a key tool to observational cosmology. To enhance the legacy value of the survey, a final public release of the complete VVDS spectroscopic redshift sample is available at http:// cesam.lam.fr/vvds.

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The VLT‐VIRMOS Mask Manufacturing Unit

Cited by 7 publications

References 6 publications

The VIMOS VLT deep survey

The VIMOS VLT deep survey

The VIMOS VLT Deep Survey

The VIMOS VLT Deep Survey final data release: a spectroscopic sample of 35 016 galaxies and AGN out toz~ 6.7 selected with 17.5 ≤i_AB ≤ 24.75

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The VLT‐VIRMOS Mask Manufacturing Unit

Cited by 7 publications

References 6 publications

The VIMOS VLT deep survey

The VIMOS VLT deep survey

The VIMOS VLT Deep Survey

The VIMOS VLT Deep Survey final data release: a spectroscopic sample of 35 016 galaxies and AGN out toz~ 6.7 selected with 17.5 ≤iAB ≤ 24.75

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Product

Resources

About

The VIMOS VLT Deep Survey final data release: a spectroscopic sample of 35 016 galaxies and AGN out toz~ 6.7 selected with 17.5 ≤i_AB ≤ 24.75