4MOST: the high-resolution spectrograph

Seifert, W.; Xu, Wei; Buschkamp, P.; Feiz, C.; Saviauk, Allar; Barden, Samuel C.; Quirrenbach, A.; Mandel, H.

doi:10.1117/12.2233252

Cited by 6 publications

(2 citation statements)

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“…On the aspect of mechanical accessibility, the on-axis design provides only limited space of 150mm x 15mm x 200mm (X/Y/Z) for the fiber assembly, and the off-axis design enable to give at least 500mm space along the main optical axis (Z). On the aspect of exit pupil, the off-axis system leads an anamorphic pupil with compression ratio of 10% in the dispersed dimension (Y), see Figure 11 (a), which is similar with 4MOST high resolution spectrograph [12]. The disperser design can be used to get a corrected circular pupil, same as the on-axis design, see Figure 11 (b).…”

Section: Optical Designmentioning

confidence: 70%

Mauna Kea Spectroscopic Explorer (MSE): a preliminary design of multi-object high resolution spectrograph

Zhang

Zhou

Tang

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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The Maunakea Spectroscopic Explorer (MSE) project will transform the CFHT 3.6m optical telescope to a 10m class dedicated multi-object spectroscopic facility, with an ability to measure thousands of objects with three spectral resolution modes respectively low resolution of R≈3,000, moderate resolution of R≈6,000 and high resolution of R≈ 40,000. Two identical multi-object high resolution spectrographs are expected to simultaneously produce 1084 spectra with high resolution of 40,000 at Blue (401-416nm) and Green (472-489nm) channels, and 20,000 at Red (626-674nm) channel. At the Conceptual Design Phase (CoDP), different optical schemes were proposed to meet the challenging requirements, especially a unique design with a novel transmission image slicer array, and another conventional design with oversize Volume Phase Holographic (VPH) gratings. It became clear during the CoDP that both designs presented problems of complexity or feasibility of manufacture, especially high line density disperser (general name for all kinds of grating, grism, prism). At the present, a new design scheme is proposed for investigating the optimal way to reduce technical risk and get more reliable estimation of cost and timescale. It contains new dispersers, F/2 fast collimator and so on. Therein, the disperser takes advantage of a special grism and a prism to reduce line density on grating surface, keep wide opening angle of optical path, and get the similar spectrum layout in all three spectral channels. For the fast collimator, it carefully compares on-axis and off-axis designs in throughput, interface to fiber assembly and technical risks. The current progress is more competitive and credible than the previous design, but it also indicates more challenging work will be done to improve its accessibility in engineering.

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Section: Optical Designmentioning

confidence: 70%

Mauna Kea Spectroscopic Explorer (MSE): a preliminary design of multi-object high resolution spectrograph

Zhang

Zhou

Tang

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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“…2. The preliminary designs of the two spectrographs are further described in Laurent et al (2016) and Seifert et al (2016). A complete list of papers from the 4MOST consortium can be found at https://www.4most.eu/cms/ publications/.…”

Section: A Brief Introduction To the 4most Facilitymentioning

confidence: 99%

Galactic Archeology with 4MOST

et al. 2017

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4MOST is a new wide-field, high-multiplex spectroscopic survey facility for the VISTA telescope of ESO. Starting in 2022, 4MOST will deploy more than 2400 fibres in a 4.1 square degree field-of-view using a positioner based on the tilting spine principle. In this contribution we give an outline of the major science goals we wish to achieve with 4MOST in the area of Galactic Archeology. The 4MOST Galactic Archeology surveys have been designed to address long-standing and far-reaching problems in Galactic science. They are focused on four major themes: 1) Near-field cosmology tests, 2) Chemo-dynamical characterisation of the major Milky Way stellar components, 3) The Galactic Halo and beyond, and 4) Discovery and characterisation of extremely metal-poor stars.In addition to a top-level description of the Galactic surveys we provide information about how the community will be able to join 4MOST via a call for Public Spectroscopic Surveys that ESO will launch.

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The LOFAR Two-metre Sky Survey

Duncan

Sabater

Röttgering

et al. 2019

A&A

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The LOFAR Two-metre Sky Survey (LoTSS) is a sensitive, high-resolution 120–168 MHz survey of the Northern sky. The LoTSS First Data Release (DR1) presents 424 square degrees of radio continuum observations over the HETDEX Spring Field (10h45m00s < right ascension < 15h30m00s and 45°00′00″ < declination < 57°00′00″) with a median sensitivity of 71 μJy beam−1 and a resolution of 6″. In this paper we present photometric redshifts (photo-z) for 94.4% of optical sources over this region that are detected in the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS) 3π steradian survey. Combining the Pan-STARRS optical data with mid-infrared photometry from the Wide-field Infrared Survey Explorer, we estimate photo-zs using a novel hybrid photometric redshift methodology optimised to produce the best possible performance for the diverse sample of radio continuum selected sources. For the radio-continuum detected population, we find an overall scatter in the photo-z of 3.9% and an outlier fraction (|zphot−zspec|/(1 + zspec) > 0.15) of 7.9%. We also find that, at a given redshift, there is no strong trend in photo-z quality as a function of radio luminosity. However there are strong trends as a function of redshift for a given radio luminosity, a result of selection effects in the spectroscopic sample and/or intrinsic evolution within the radio source population. Additionally, for the sample of sources in the LoTSS First Data Release with optical counterparts, we present rest-frame optical and mid-infrared magnitudes based on template fits to the consensus photometric (or spectroscopic when available) redshift.

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4MOST: the high-resolution spectrograph

Cited by 6 publications

References 0 publications

Mauna Kea Spectroscopic Explorer (MSE): a preliminary design of multi-object high resolution spectrograph

Mauna Kea Spectroscopic Explorer (MSE): a preliminary design of multi-object high resolution spectrograph

Galactic Archeology with 4MOST

The LOFAR Two-metre Sky Survey

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