1,721,119 research outputs found
Galaxy Groups Associated with Gravitational Lenses and H0 from B1608+656
Get PDFCompact groups of galaxies recently have been discovered in association with several strong gravitational lens systems. These groups provide additional convergence to the lensing potential and thus affect the value of H0 derived from the systems. Lens system time delays are now being measured with uncertainties of only a few percent or better. Additionally, vast improvements are being made in incorporating observational constraints such as Einstein ring structures and stellar velocity dispersions into the lens models. These advances are reducing the uncertainties on H0 to levels at which the the effects of associated galaxy groups may contribute significantly to the overall error budget. We describe a dedicated multiwavelength program, using Keck, HST, and Chandra, to find such groups and measure their properties. We present, as a case study, results obtained from observations of the CLASS lens system B1608+656 and discuss the implications for the value of H0 derived from this system
Hubble, Chandra and Keck Constraints on Massive Galaxy Clusters at z=0.2 and z=0.5
Get PDFI present recent observations from two Hubble Space Telescope(HST)/ACS programs that target the most X–ray luminous and thus (presumably) most massive galaxy clusters at – the highest redshift at which complete, well–defined samples of such rare systems are available. The first program (GO:9836, PI: R.S. Ellis) exploits a huge mosaic of 41 ACS pointings spanning a 10 Mpc region centered on MS0451-03. This is the largest contiguous space–based image of a cluster to date. I describe a preliminary weak–lensing analysis and a new Keck/DEIMOS redshift catalog of 1000 galaxies in this field. The second program (GO:9722, PI: H. Ebeling) studies the core regions of the twelve most luminous clusters at from the MAssive Cluster Survey (MACS; Ebeling et al. 2001). Multi–color ACS observations in combination with recent Keck/LRIS spectroscopy of gravitational arcs constrain the distribution of mass in the cluster cores, thus laying the foundation for detailed multi–diagnostic (lensing, X–ray, near–infrared, SZE) investigation of this sample. For example, it is of particular interest to explore how the structure and state of relaxation of massive clusters evolved between this sample at that measured by Smith et al. (2004, astro–ph/0403588) at .To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.htm
Euclid SGS SDC-IT PAQA Report (05/2020 - 11/2020)
No full textThis PAQA report was jointly prepared by the ECSGS Management and by SDC-IT. The report concerns SDC-IT itself and the following Processing Functions for which SDC-IT is primary: NIR version 1.1.0, SIR version 1.2.0 and MER version 8.1.1. This PAQA report covers the period: May 2020 - November 2020.Version 20.11 provided as reference document for the ESA Euclid SGS Implementation Review (2021
ECSGS Management Plan
Get PDFThe ECSGS Management Plan is focused on the following topics: ECSGS organisation, responsibilities, reporting; ECSGS costing, manpower, effort tracking; ECSGS logistic (when relevant); organisation of individual OUs and SDCs under ECSGS coordination. Sections 9 and 10 contain global and local organisation details, and the names of responsible staff. The management principles expressed in this document are a coherent extension of those described in the ECSGS Science Implementation Plan. The document is compliant with the ECSS standards, as tailored for the Euclid SGS.Version 0.9 reviewed by ESA at the Euclid SGS Preliminary Requirements Review (2013)
Version 1.9 reviewed by ESA at the Euclid SGS System Requirements Review (2015
Euclid SGS SDC-IT PAQA Report (07/2022 - 09/2022)
No full textThis PAQA report was jointly prepared by the ECSGS Management and by SDC-IT. The report concerns SDC-IT itself and the following Processing Functions for which SDC-IT is primary (NIR, SIR, MER and LE1 NISP).
The PAQA report covers the period: July 2022 - September 2022.Version 22.09 provided as reference document for the ESA Euclid Readiness Review (2022
Euclid SGS NIR Software Test Report
No full textThis document aims at specifying the Software Test Plan to be implemented in the context of a specific test campaign conducted at the product level for the NIR software product, and at reporting the outcome of the execution of the specified test plan.
This document is based on the Euclid SGS NIR Validation Plan & Software Tests Specifications document, which specifies all tests and test cases for the NIR PF validation. The first part of the test plan describes the objectives of the test campaign.
The technical and scientific objectives to be pursued by means of the execution of the test campaign are identified considering the NIR requirements that are planned to be validated during the test campaign. Some of the objectives can be related to the integration of the software product in the Euclid SGS infrastructure. Other objectives relate to the functionalities of the software product, the performances, the integration of the product in the whole SGS system, the design and the sizing (allocation and consumption of hardware resources), the integration, validation, quality, reliability, maintainability, packaging and operability of the software product.
This release of the document has been produced in order to validate the NIR PF software delivered for the Performance Verification Rehearsal 1 tests (PV RH1).Version 2.1.1 reviewed by ESA at the Euclid SGS Readiness Revie
Euclid SGS NIR PF Software User Manual
No full textThe NIR processing function is part of the Euclid SGS data processing software and is intended to be executed automatically inside the Euclid SGS infrastructure. The operation environment and the interfaces of the software, both with the Euclid infrastructure and with the other processing functions, have been standardized across the whole Euclid SGS. Therefore, this document covers only what is specific to the processing function.
The NIR Processing Function is in charge of producing calibrated exposures and stacks by processing raw NISP scientific and calibration exposures and the associated auxiliary data produced by the LE1 processing function, operated by SOC. It reduces all NISP imaging data of the Euclid wide and deep surveys. It also reduces data from dedicated NISP-P calibration blocks, acquired during the Performance Verification phase or during nominal flight operations.
Part of the NIR PF processing steps performing the pre-reduction are also in charge of processing the images acquired by NISP spectroscopic channel and are therefore in common with the SIR Processing function.
This Software User Manual provides generic installation and usage instructions for the NIR pipelines.
This issue of the SUM is applicable for NIR PF release 2.1.1.Version 1.0 reviewed by ESA at the Euclid SGS Readiness Revie
Euclid SGS NIR Software Design Document
No full textThis software design document provides a description of the software architectural design and a detailed design of the NIR Processing Function (PF). It presents the high-level architectural overview and the architecture and design of each NIR PF software component. It also includes the traceability matrix from each software component to the requirements.
This document covers the functional architecture of the NIR PF. For each NIR pipeline processing step, a high-level description of the algorithm is provided together with references to the relevant documents which include more detailed information. This document explains what the software does and how, but it does not explain how to operate it; for that, refer to the software user manual.Version 0.7 reviewed by ESA at the Euclid SGS Design Review (2017)
Version 1.1 submitted as reference document for the Euclid SGS Implementation Review (2021)
Version 1.2 submitted as reference document for the Euclid SGS Readiness Review (2022
Euclid SGS Processing Budget Technical Note
No full textThis document gathers and summarizes the information from the latest performance figures from the Infrastructure and Scientific challenges reports. Release 4.2 of this document is based on the results and metrics from the Scientific Challenge 8 runs. It extrapolates these figures under assumptions clearly stated: for the prelaunch phase, simulation production plan, end-to-end scenarios, and operational rehearsal tests; for the post-launch phase, reprocessing ratio and simulation scenarios. This document highlights the most stringent assumptions and uncertainties about these figures, assesses the consequences of this processing budget on the SGS architecture, identifying bottlenecks, risks and action plans; it matches the infrastructure procurement strategy for the different stakeholders (SDC’s) of the Euclid Consortium with the infrastructure requirements derived from this document.
This document is a living document: its origins are in the Preliminary Requirements Review with raw inputs and rough estimates from OU/SDC’s. This document will continue to be updated as necessary.Version 1.0 reviewed by ESA at the Euclid SGS System Requirements Review (2015)
Version 3.2 reviewed by ESA at the Euclid SGS Design Review (2017)
Version 4.0 reviewed by ESA at the Euclid SGS Implementation Review (2021)
Version 4.2 reviewed by ESA at the Euclid SGS Readiness Review (2022
Euclid SGS SIR Processing Function Requirements Specifications
No full textThe SIR Processing Function (PF) is in charge of the reduction of the NISP spectroscopic data, starting from the Level 1 data to produce one-dimensional spectra that are fully wavelength and flux calibrated, and corrected for contamination from nearby objects. The PF is divided into two main processing blocks: the pre-processing, with the task of removing most detector signatures from the data; and the spectra extraction, with the task of locating and extracting the spectra from the NISP spectroscopic data, and to produce fully wavelength and flux calibrated one and two-dimensional spectra. In parallel to this “scientific” pipeline, within the SIR PF there is also a calibration pipeline, which is a collection of specific processing elements with the task of reducing the calibration observations and to prepare the calibration data needed by the scientific pipeline.
The Euclid SGS requirements specification process produces the Euclid SGS Requirements Specification Document and a set of Requirements Specification Documents for specific SGS products such as the Processing Functions. The present document is part of this set of documents. To ensure completeness and consistency with applicable documents, traceability and verification matrices complement the SGS Requirements Specification Documents.Version 0.9 reviewed by ESA at the Euclid SGS System Requirements Review (2015)
Version 1.9 provided as reference document for the ESA Euclid SGS Design Review (2017)
Version 2.8 provided as reference document for the ESA Euclid SGS Implementation Review (2021)
Version 3.1 provided as reference document for the ESA Euclid SGS Readiness Review (2022
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