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SDSS-IV/MaNGA: SPECTROPHOTOMETRIC CALIBRATION TECHNIQUE

文献类型:期刊论文

作者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
出版日期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
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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来源:上海天文台

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