SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE | |
Yan, Renbin1; Tremonti, Christy2; Bershady, Matthew A.2; Law, David R.3; Schlegel, David J.4; Bundy, Kevin5; Drory, Niv6; MacDonald, Nicholas7; Bizyaev, Dmitry8,9; Blanc, Guillermo A.10,11,12 | |
刊名 | ASTRONOMICAL JOURNAL |
2016 | |
卷号 | 151期号:1页码:8 |
关键词 | atmospheric effects methods: observational surveys techniques: imaging spectroscopy |
英文摘要 | Mapping Nearby Galaxies at Apache Point Observatory (MaNGA), one of three core programs in the Sloan Digital Sky Survey-IV, is an integral-field spectroscopic survey of roughly 10,000 nearby galaxies. It employs dithered observations using 17 hexagonal bundles of 2'' fibers to obtain resolved spectroscopy over a wide wavelength range of 3600-10300 angstrom. To map the internal variations within each galaxy, we need to perform accurate spectral surface photometry, which is to calibrate the specific intensity at every spatial location sampled by each individual aperture element of the integral field unit. The calibration must correct only for the flux loss due to atmospheric throughput and the instrument response, but not for losses due to the finite geometry of the fiber aperture. This requires the use of standard star measurements to strictly separate these two flux loss factors (throughput versus geometry), a difficult challenge with standard single-fiber spectroscopy techniques due to various practical limitations. Therefore, we developed a technique for spectral surface photometry using multiple small fiber-bundles targeting standard stars simultaneously with galaxy observations. We discuss the principles of our approach and how they compare to previous efforts, and we demonstrate the precision and accuracy achieved. MaNGA's relative calibration between the wavelengths of H alpha and H beta has an rms of 1.7%, while that between [N II] lambda 6583 and [O II] lambda 3727 has an rms of 4.7%. Using extinction-corrected star formation rates and gas-phase metallicities as an illustration, this level of precision guarantees that flux calibration errors will be sub-dominant when estimating these quantities. The absolute calibration is better than 5% for more than 89% of MaNGA's wavelength range. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | DIGITAL SKY SURVEY ; 2.5 M TELESCOPE ; GALAXY SURVEY ; DATA RELEASE ; ULTRAVIOLET ; ABUNDANCES ; STANDARDS ; CALIFA ; STAR |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000368250900008 |
内容类型 | 期刊论文 |
源URL | [http://119.78.226.72/handle/331011/28535] |
专题 | 上海天文台_星系宇宙学重点实验室 |
作者单位 | 1.Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA 2.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA 3.Space Telescope Sci Inst, Baltimore, MD 21218 USA 4.Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA 5.Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan 6.Univ Texas Austin, Dept Astron, McDonald Observ, Austin, TX 78712 USA 7.Univ Washington, Dept Astron, Seattle, WA 98195 USA 8.Apache Point Observ, Sunspot, NM 88349 USA 9.Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia 10.Univ Chile, Dept Astron, Santiago, Chile |
推荐引用方式 GB/T 7714 | Yan, Renbin,Tremonti, Christy,Bershady, Matthew A.,et al. SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE[J]. ASTRONOMICAL JOURNAL,2016,151(1):8. |
APA | Yan, Renbin.,Tremonti, Christy.,Bershady, Matthew A..,Law, David R..,Schlegel, David J..,...&Zhang, Kai.(2016).SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE.ASTRONOMICAL JOURNAL,151(1),8. |
MLA | Yan, Renbin,et al."SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE".ASTRONOMICAL JOURNAL 151.1(2016):8. |
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