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The SDSS-V Local Volume Mapper (LVM): Scientific Motivation and Project Overview
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abstract
We present the Sloan Digital Sky Survey V (SDSS-V) Local Volume Mapper (LVM). The LVM is an integral-field spectroscopic survey of the Milky Way, Magellanic Clouds, and of a sample of local volume galaxies, connecting resolved pc-scale individual sources of feedback to kpc-scale ionized interstellar medium (ISM) properties. The 4-year survey covers the southern Milky Way disk at spatial resolutions of 0.05 to 1 pc, the Magellanic Clouds at 10 pc resolution, and nearby large galaxies at larger scales totaling $>4300$ square degrees of sky, and more than 55M spectra. It utilizes a new facility of alt-alt mounted siderostats feeding 16 cm refractive telescopes, lenslet-coupled fiber-optics, and spectrographs covering 3600-9800A at R ~ 4000. The ultra-wide field IFU has a diameter of 0.5 degrees with 1801 hexagonally packed fibers of 35.3 arcsec apertures. The siderostats allow for a completely stationary fiber system, avoiding instability of the line spread function seen in traditional fiber feeds. Scientifically, LVM resolves the regions where energy, momentum, and chemical elements are injected into the ISM at the scale of gas clouds, while simultaneously charting where energy is being dissipated (via cooling, shocks, turbulence, bulk flows, etc.) to global scales. This combined local and global view enables us to constrain physical processes regulating how stellar feedback operates and couples to galactic kinematics and disk-scale structures, such as the bar and spiral arms, as well as gas in- and out-flows.
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Cited by 6 Pith papers
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SRG/eROSITA X-ray selected cataclysmic variable candidates observed in SDSS-V DR20
eROSITA-selected SDSS-V DR20 spectroscopy yields 587 cataclysmic variables (274 known), including new nearby systems, AM CVns, and a low-accretion-rate polar.
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The Twentieth Data Release of the Sloan Digital Sky Survey: First All-Sky BOSS Spectra, eROSITA-SDSS-V Mapper Coordinated Observations, and a Preview of the Local Volume Mapper
DR20 releases over three million BOSS spectra (first southern-hemisphere SDSS-V optical data), 169 LVM integral-field tiles over six targets, and eighteen value-added catalogs.
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Physical properties of HII regions at sub-kpc scales using integral field spectroscopy on IC 342
The first large integral-field map of IC 342 reveals 1155 HII regions whose radial dust, metallicity, and star-formation gradients are typical for a galaxy of its stellar mass.
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The SDSS-V Local Volume Mapper (LVM): Data Analysis Pipeline
The LVM-DAP recovers gas emission-line fluxes and kinematics with claimed survey-grade accuracy, but its stellar parameter estimates are reliable only for single stars and biased for mixed stellar populations.
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Exploring the Galactic plasma with pulsars in the SKA Era
Pulsars map Galactic, solar-wind, and ionospheric plasma via DM, RM, scintillation, and scattering; SKA-Low/Mid AA4 will push DM precision to ~10^{-8} pc cm^{-3} and transform IISM models.
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