The SDSS-V Local Volume Mapper Instrument

Nicholas P. Konidaris II; Thomas Herbst; Cynthia Froning; Stefanie Wachter; Solange Ramírez; Juna Kollmeier; Hans-Walter Rix; Niv Drory; Guillermo Blanc; Jose Sánchez-Gallego; Carlos Godoy Alfaro; Hojae Ahn; Leon Aslan; Felipe Besser; Pavan Bilgi; Peter Bizenberger; Dmitry Bizyaev; Julia Brady; Rebecca Brown; Florian Briegel; Mauricio Flores Cabrales; Scott Case; John Donor; Tobias Feger; Wolfgang Gaessler; Maximilian Häberle; Ellen Houston; Charlie Hull; Amy Jones; Changgon Kim; Vince Kowal; Yevgen Kripak; Kathryn Kreckel; Markus Kuhlberg; Alicia Lanz; Michael Lesser; Richard Mathar; Lars Mohr; Francisco Morales; Soojong Pak; Povilas Palunas; Richard Pogge; Christopher Ritz; David Robertson; Marcelo Rodriguez; Ralf-Rainer Rohloff; Alan Uomoto; Ming Yeong; Abner Zapata; Ross Zhelem

doi:10.1117/12.3019892

18 July 2024 The SDSS-V Local Volume Mapper Instrument

Nicholas P. Konidaris II, Thomas Herbst, Cynthia Froning, Stefanie Wachter, Solange Ramírez, Juna Kollmeier, Hans-Walter Rix, Niv Drory, Guillermo Blanc, Jose Sánchez-Gallego, Carlos Godoy Alfaro, Hojae Ahn, Leon Aslan, Felipe Besser, Pavan Bilgi, Peter Bizenberger, Dmitry Bizyaev, Julia Brady, Rebecca Brown, Florian Briegel, Mauricio Flores Cabrales, Scott Case, John Donor, Tobias Feger, Wolfgang Gaessler, Maximilian Häberle, Ellen Houston, Charlie Hull, Amy Jones, Changgon Kim, Vince Kowal, Yevgen Kripak, Kathryn Kreckel, Markus Kuhlberg, Alicia Lanz, Michael Lesser, Richard Mathar, Lars Mohr, Francisco Morales, Soojong Pak, Povilas Palunas, Richard Pogge, Christopher Ritz, David Robertson, Marcelo Rodriguez, Ralf-Rainer Rohloff, Alan Uomoto, Ming Yeong, Abner Zapata, Ross Zhelem

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130961Z (2024) https://doi.org/10.1117/12.3019892
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

We describe the Sloan Digital Sky Survey Local Volume Mapper Instrument (LVM-I) construction, testing, and initial performance. The facility is designed to produce the first integral map of thousands of degrees of the Southern sky. The map will cover spectra from bluer than [O II] to 980 nm with a dispersion of over R = Δλ/λ > 4, 000 at Hα wavelength. Each spaxel will have a pitch of ∼35′′, and the survey will be conducted using four integral field units (IFUs) with an instantaneous field of view of 530 arcmin². The LVM facility is designed to achieve the required sub-Rayleigh spectroscopy over large sky areas with outstanding spectrophotometric accuracy and precision. LVM-I is designed to produce this unique dataset using four siderostats on commercial mounts. The four beams are fed into 16-cm-diameter f/11.4 apochromatic objectives, and the sky is derotated with K mirrors. These telescopes produce an image of the field onto both guider cameras and a lenslet array. The array reimages the field at f/3.7 onto 107-micron-diameter fibers. Blue throughput is maximized with a short 18.5-m fiber run from the IFUs to the spectrographs. The fibers are reconfigured inside a splicing box to distribute the fibers from the four telescopes to three spectrographs. The spectrographs are near-copies of the Dark Energy Survey three-band f/1.7 spectrographs, which deliver sharp images over the entire chromatic range. Nine STA charge-coupled devices (CCDs), cooled with liquid-nitrogen dewars, are used for the survey. The LVM-I is controlled with custom Python software and distributed over various computers using power-over-ethernet networking. The system is housed in a custom enclosure with a roll-off roof to grant access to the sky. The enclosure allows all four telescopes to point all over the sky and measure the transmissivity of the atmosphere and the sky background. Some of the first-light data products are highlighted here.

Conference Presentation

Citation Download Citation

Nicholas P. Konidaris II, Thomas Herbst, Cynthia Froning, Stefanie Wachter, Solange Ramírez, Juna Kollmeier, Hans-Walter Rix, Niv Drory, Guillermo Blanc, Jose Sánchez-Gallego, Carlos Godoy Alfaro, Hojae Ahn, Leon Aslan, Felipe Besser, Pavan Bilgi, Peter Bizenberger, Dmitry Bizyaev, Julia Brady, Rebecca Brown, Florian Briegel, Mauricio Flores Cabrales, Scott Case, John Donor, Tobias Feger, Wolfgang Gaessler, Maximilian Häberle, Ellen Houston, Charlie Hull, Amy Jones, Changgon Kim, Vince Kowal, Yevgen Kripak, Kathryn Kreckel, Markus Kuhlberg, Alicia Lanz, Michael Lesser, Richard Mathar, Lars Mohr, Francisco Morales, Soojong Pak, Povilas Palunas, Richard Pogge, Christopher Ritz, David Robertson, Marcelo Rodriguez, Ralf-Rainer Rohloff, Alan Uomoto, Ming Yeong, Abner Zapata, and Ross Zhelem "The SDSS-V Local Volume Mapper Instrument", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130961Z (18 July 2024); https://doi.org/10.1117/12.3019892

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