SPHEREx: An All-Sky Spectral Survey A NASA Small Explorer Satellite Selected for Phase A

Jamie Bock for the SPHEREx team

SPHEREx Addresses All 3 NASA Science Goals in Astrophysics High Throughput Spectroscopy

Map the large scale Wide-field structure of galaxies to telescope study the process of 20 cm eff. Inflation in the early aperture universe, addressing NASA’s objective to Passive Probe the origin and cooling High-throughput spectrometer system uses a linear-variable filter in destiny of the Universe. front of each detector array

SPHEREx has uniquely large spectral light-collecting power designed for mapping the full sky Determine how Parameter Value interstellar ices bring Telescope Aperture 20 cm effective Pixel Size 6.2" x 6.2" • Large AΩ optical system water and organics into Field of View 2 x (3.5° x 7.0°); dichroic • LVF spectrometer has no moving parts proto-planetary systems, Wavelength Range and λ = 0.75 - 4.1 µm; λ/Δλ = 41.5; 72 spectral channels Spectral Resolution λ = 4.1 - 4.8 µm; λ/Δλ = 150; 24 spectral channels • All-passive cooling with large margins furthering NASA’s Arrays 2x Hawaii-2RG 2.5; 2x Hawaii-2RG 5.3 µm Point Source Sensitivity 18 - 19 AB mag (5σ) per spectral channel • High-readiness technologies objective to Explore Cooling All-Passive to 80 K (optics); 55 K (5 µm arrays) whether planets around other stars could harbor life. Deployed photon SPHEREx Mission Overview shields Parameter Value Orbit Low-earth sun-synchronous Science Survey 4 maps produced over 2 years Measure the total light Spacecraft Ball BCP 100 production from stars Pointing ≤ 3″ (1σ) in 200 s ≤ 150 s for 70° maneuver Slew & Settle Agility and galaxies across ≤ 20 s for 9′ maneuver PI, instrument development, Caltech cosmic history, instrument I&T

addressing NASA’s 185 cm Management, thermal system, mechanisms, electronics, software, Hardware Roles JPL objective to Explore the mission assurance, system origin and evolution of engineering BATC Spacecraft galaxies. KASI Filter, detectors, test chamber Caltech Data pipeline Science JPL Project scientist BCP 100 Deployed Responsibilities IPAC Data archive at IRSA spacecraft solar panels

Probing Inflation History of Galaxy Formation Science Team All-Sky Spectral Legacy Catalog Core Science Objecves Jamie Bock (PI) CIT Interstellar Ices Matt Ashby CfA Peter Capak IPAC Asantha Cooray UCI Roland DePutter CIT Olivier Doré (PS) JPL Tim Eifler JPL Nicolas Flagey IfA Yan Gong UCI Salman Habib ANL Katrin Heimann ANL Chris Hirata OSU Woong-Seob Jeong KASI λ Phil Korngut CIT Elisabeth Krause SU Dae-Hee Lee KASI Daniel Masters CIT Phil Mauskopf ASU Gary Melnick CfA SPHEREx tests models of inflation by measuring the 3D clustering of SPHEREx surveys the abundance and composition of biogenic ices (H O, SPHEREx explores the history of galaxy formation through deep 2 Bertrand Menneson JPL galaxies in a large-volume low-redshift survey (see above). We measure CO2, CO, XCN and CH3OH) in dense molecular clouds and protoplanetary mapping of large-scale clustering anisotropy in two 100 sq. degree deep regions near the ecliptic poles. We will use the many multi-band inflationary non-Gaussianity to a combined accuracy of ΔfNL < 1 (2σ) using disks. We will produce at least 20,000 high-quality spectra of isolated Hien Nguyen JPL Image Credit both the power spectrum and the bispectrum. SPHEREx also probes the sources with S/N > 100 per spectral channel. The spectral resolution of cross-correlations to deconvolve the history of light production. Karin Öberg CfA 2MASS All-Sky Near-IR Survey band 4 is optimized to resolve these ice spectral features. SPHEREx has sufficient raw sensitivity to detect the background running of the spectral index (αs) and the departure from flatness (Ωk). Anthony Pullen CMU component from first galaxies at the epoch of reionization (EOR). Cosmological Parameter Sensitivity Alvise Raccanelli JHU SPHEREx (MEV) Roger Smith CIT SPHEREx provides a near-IR spectrum for every point on the sky, rich science 1σ errors Euclid Current PS BS PS+BS Yong-Seon Song KASI 9 ASTROPHYSICS WITH THE SPHEREX Volker Tolls CfA ● 10 detected galaxies ● 0-300 QSOs at z > 7 fNL 0.87 0.23 0.20 5.59 5.8 8 4 Spectral Index n (x 10-3) 2.7 2.3 2.2 2.6 5.4 More Informaon ALL-SKY SPECTRAL SURVEY Stephen Unwin JPL ● 10 galaxies with σz/(1+z) < 3 % redshifts ● >10 clusters, redshifts, virial masses s Running (x10-3) 1.3 1.2 0.65 1.1 17 A Community Workshop on the New Sciences Enabled by the Michael Werner JPL ● 106 galaxies with /(1+z) < 0.3 % redshifts ● >107 stars; 103 with hot dust αs σz Curvature Ω (x10-4) 9.8 9.5 6.6 7.0 66 SPHEREx Optical to Near-Infrared Spectroscopic Survey Marco Viero SU 6 k http://spherex.caltech.edu ● >10 QSOs ● All-sky line maps Dark Energy FOM 202 NC NC 309 14 February 24-26, 2016 in Pasadena Michael Zemcov RIT