Introduction to SDSS-IV and DESI
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1 Introduction to SDSS-IV and DESI Ho Seong HWANG (KIAS) 2015 January 27 The 4th Survey Science Group Workshops
2 SDSS-I: SDSS-II: SDSS-III: SDSS-IV:
3 SDSS-IV: Project Members
4 SDSS-IV: Programs
5 MaNGA
6 MaNGA (Mapping Nearby Galaxies at APO) PI: Kevin Bundy (Kavli IPMU)
7 MaNGA: Technical Details Dark-time observations (half of SDSS-IV) Fall 2014 Spring IFUs per 7 deg 2 plate Wavelength: nm, R~2000 (~64 km s -1 ) 3-hour exposures with dithering (sub-fiber-diameter)
8 MaNGA: Sample Selection 10,000 galaxies at 0.01<z<0.15 across ~4000 deg 2 Flat Mstar distribution with M > 10 9 Msun No size or inclination cuts Only redshift and a color-based stellar mass estimate Primary sample: 67%, spatial coverage to 1.5 Re Secondary sample: 33%, spatial coverage to 2.5 Re
9 MaNGA: Instrumentation IFU complement per plate : diameter 17 IFUs deployed to targets anywhere within the 3 diameter focal plane Fibers with 2 diameters
10 MaNGA Bundy+14
11 MaNGA: Science Goals How does gas accretion drive the growth of galaxies? What are the roles of stellar accretion, major mergers, and instabilities in forming galactic bulges and ellipticals? What quenches star formation? How was angular momentum distributed among baryonic and nonbaryonic components as the galaxy formed?
12 MaNGA: Star Formation History of Galaxies Bundy+14
13 MaNGA: Dynamical & Stellar Population Constraints Bundy+14
14 eboss (Extended Baryon Oscillation Spectroscopic Survey) PI: Jean-Paul Kneib (EPFL)
15 eboss: Technical Details Dark-time observations Fall 2014 Spring fibers per 7 deg 2 plate Wavelength: nm, R~2000
16 eboss: Technical Details 375,000 luminous red galaxies over 7500 deg 2, 0.6 < z < ,000 emission line galaxies over 1500 deg 2, 0.6 < z < ,000 quasars over 7500 deg 2, 0.9 < z < 3.5 SDSS WP
17 eboss: Science Goals BAO: Baryon Acoustic Oscillations Eisenstein+05
18 eboss: Science Goals BAO: the effects of dark energy on the expansion history SDSS WP Anderson+14
19 eboss: Science Goals Redshift-Space Distortion (RSD): Growth of Structure Test of General Relativity SDSS WP 2D correlation function of DR9 CMASS (Reid+12)
20 eboss: Science Goals RSD: Growth of Structure Test of General Relativity Jain & Khoury 10
21 eboss: Science Goals Cosmology Beyond Dark Energy Test of non-gaussianity in the primordial density field Test of inflation Measure of the sum of the neutrino masses More info : SDSS-IV White Paper at
22 eboss: Sub-Programs (~5% each) TDSS (Time-Domain Spectroscopic Survey) ~10 5 PanSTARRS-1 photometric variables at i 21 No preselection based on colors or light curves PI: Paul Green (SAO) & Scott Anderson (UW) SPIDERS (Spectroscopic Identification of erosita Sources) ~10 5 erosita sources (AGN & Galaxy Clusters) erosita (extended ROentgen Survey with an Imaging Telescope Array) all-sky survey at kev to be launched early 2016 PI: Andrea Merloni & Kirpal Nandra (MPE)
23 APOGEE-2: APO Galactic Evolution Experiment 2 PI: Steve Majewski (EPFL)
24 APOGEE-2: Technical Details Bright-time observations at APO and LCO 300 fibers per 7 deg² plate (APO), 3.5 deg² plate (LCO) Fall 2014 Fall 2020 Wavelength: µm (H-band), R~22, ,000 stars with signal-to-noise S/N > 100 Radial velocity precision ~ 100 m/s
25 APOGEE-2: Technical Details APOGEE-1, APOGEE-2 (orange and green (Kepler) for APO, yellow for LCO) (SDSS WP)
26 APOGEE-2: Science Goals What is the history of star-formation and chemical enrichment of the Milky Way? What are the dynamics of the disk, bulge and halo of the Milky Way? What is the age distribution of stars in the Milky Way? Are certain properties of stars associated with whether or not they have planets?
27 APOGEE-2: Richness & Power of H-band Spectra A Sagittarius dsph star (SDSS WP)
28 APOGEE-2: Fundamental Stellar Parameters 35,000 stars from APOGEE-1 (SDSS WP)
29 APOGEE-2: Technical Details SDSS WP
30 DESI (Dark Energy Spectroscopic Instrument) Formally BigBOSS (Talk by Prof. Juhan Kim in 2013) (Imaging &) Spectroscopic Survey with 4m Mayall telescope
31 DESI: Project Members
32 DESI: Instrument Schlegel+
33 DESI: Sample Selection Schlegel+
34 DESI: Sample Selection g=24.0 r=23.6 z=23.0 DESI CDR
35 DESI: Science Goals BAO: the effects of dark energy on the expansion history DESI CDR
36 DESI: Science Goals RSD: Growth of Structure Test of General Relativity Samushia+14 Huterer+13
37 DESI: Science Goals Cosmology Beyond Dark Energy Test of non-gaussianity in the primordial density field Test of inflation Measure of the sum of the neutrino masses More info : Conceptual Design Report at
38 Current/Planned BAO capable Spectroscopic Surveys DESI CDR
39 Conclusion SDSS4 started! ( ) DESI will start soon ( )
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