SDSS-IV MaNGA IFS GALAXY SURVEY—SURVEY DESIGN, EXECUTION, AND INITIAL DATA QUALITY

Abstract

The MaNGA Survey (Mapping Nearby Galaxies at Apache Point Observatory) is one of three core programs in the Sloan Digital Sky Survey IV. It is obtaining integral field spectroscopy for 10,000nearby galaxies at a spectral resolution of R∼2000 from 3622 to 10354 Å. The design of the survey is driven by a set of science requirements on the precision of estimates of the following properties: star formation rate surface density, gas metallicity, stellar population age, metallicity, and abundance ratio, and their gradients; stellar and gas kinematics; and enclosed The Astronomical Journal, 152:197 (32pp) 1 gravitational mass as a function of radius. We describe how these science requirements set the depth of the observations and dictate sample selection. The majority of targeted galaxies are selected to ensure uniform spatial coverage in units of effective radius (R e ) while maximizing spatial resolution. About two-thirds of the sample is covered out to 1.5R e (Primary sample), and one-thirdof the sample is covered to 2.5R e (Secondary sample). We describe the survey execution with details that would be useful in the design of similar future surveys. We also present statistics on the achieved data quality, specificallythe point-spread function, sampling uniformity, spectral resolution, sky subtraction, and flux calibration. For our Primary sample, the median r-band signal-to-noise ratio is ∼70 per 1.4 Å pixel for spectra stacked between 1R e and 1.5R e . Measurements of various galaxy properties from the first-year data show that we are meeting or exceeding the defined requirements for the majority of our science goals.

Biases in Metallicity Measurements from Global Galaxy Spectra: The Effects of Flux Weighting and Diffuse Ionized Gas Contamination

“…To achieve this task, we characterize the DIG emission line ratios using data from the SDSS-IV Mapping Nearby Galaxies at APO (MaNGA; Bundy et al 2015;Yan et al 2016;Law et al 2016) integral field spectroscopic (IFS) survey. The MaNGA IFS dataset provides spatially-resolved spectroscopic observations of a large number of local star-forming galaxies for which such an analysis of DIG emission is possible (Zhang et al 2017).…”

SDSS IV MaNGA: Dependence of Global and Spatially Resolved SFR–M∗ Relations on Galaxy Properties

“…The advent of the MaNGA survey (Bundy et al 2015;Law et al 2015;Yan et al 2016a), which spatially resolves stellar and gas properties, offers an excellent opportunity to examine the Hα-M * relation. MaNGA is part of the fourth generation of the Sloan Digital Sky Survey (SDSS-IV; Gunn et al 2006;Blanton et al 2017) and aims to obtain the spatially resolved spectroscopy of 10,000 galaxies with median redshift ∼0.03 by 2020.…”

SDSS-IV MaNGA: the different quenching histories of fast and slow rotators

“…For a further description of the instrumentation used by MaNGA see Drory et al (2015). For a detailed description of the observing strategy 1 Instrument resolution as a function of wavelength in shown in Figure 20 of Yan et al (2016) see Law et al (2015) and for a description of the survey design see Yan et al (2016).…”