TESTING LSST DITHER STRATEGIES FOR SURVEY UNIFORMITY AND LARGE-SCALE STRUCTURE SYSTEMATICS
文献类型：期刊论文
| 作者 | Awan, Humna1; Gawiser, Eric1; Kurczynski, Peter1; Jones, R. Lynne2; Zhan, Hu3 ; Padilla, Nelson D.4; Munoz Arancibia, Alejandra M.4,5; Orsi, Alvaro6; Cora, Sofia A.7,8,9; Yoachim, Peter2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-09-20 |
| 卷号 | 829期号:1 |
| 关键词 | dark energy large-scale structure of universe surveys |
| 英文摘要 | The Large Synoptic Survey Telescope (LSST) will survey the southern sky from 2022-2032 with unprecedented detail. Since the observing strategy can lead to artifacts in the data, we investigate the effects of telescope-pointing offsets (called dithers) on the r-band coadded 5 sigma depth yielded after the 10-year survey. We analyze this survey depth for several geometric patterns of dithers (e.g., random, hexagonal lattice, spiral) with amplitudes as large as the radius of the LSST field of view, implemented on different timescales (per season, per night, per visit). Our results illustrate that per night and per visit dither assignments are more effective than per season assignments. Also, we find that some dither geometries (e.g., hexagonal lattice) are particularly sensitive to the timescale on which the dithers are implemented, while others like random dithers perform well on all timescales. We then model the propagation of depth variations to artificial fluctuations in galaxy counts, which are a systematic for LSS studies. We calculate the bias in galaxy counts caused by the observing strategy accounting for photometric calibration uncertainties, dust extinction, and magnitude cuts; uncertainties in this bias limit our ability to account for structure induced by the observing strategy. We find that after 10 years of the LSST survey, the best dither strategies lead to uncertainties in this bias that are smaller than the minimum statistical floor for a galaxy catalog as deep as r < 27.5. A few of these strategies bring the uncertainties close to the statistical floor for r < 25.7 after the first year of survey. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | POWER-SPECTRUM ; HIERARCHICAL UNIVERSE ; GALAXIES ; CALIBRATION ; CLUSTER ; ERRORS ; EMISSION ; MODEL ; MAPS ; I. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000385374500050 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6908]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08554 USA 2.Univ Washington, Dept Astron, 3910 15th Ave NE, Seattle, WA 98195 USA 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China 4.Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile 5.Univ Valparaiso, Inst Fis & Astron, Av Gran Bretana 1111, Valparaiso, Chile 6.Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain 7.UNLP, CONICET, CCT La Plata, Inst Astrofis La Plata, Paseo Bosque S-N,B1900FWA, La Plata, Buenos Aires, Argentina 8.Univ Nacl La Plata, Fac Ciencias Astron & Geofis, Paseo Bosque S-N,B1900FWA, La Plata, Buenos Aires, Argentina 9.Consejo Nacl Invest Cient & Tecn, Av Rivadavia 1917, Caba, Argentina |
| 推荐引用方式 GB/T 7714 | Awan, Humna,Gawiser, Eric,Kurczynski, Peter,et al. TESTING LSST DITHER STRATEGIES FOR SURVEY UNIFORMITY AND LARGE-SCALE STRUCTURE SYSTEMATICS[J]. ASTROPHYSICAL JOURNAL,2016,829(1). |
| APA | Awan, Humna.,Gawiser, Eric.,Kurczynski, Peter.,Jones, R. Lynne.,Zhan, Hu.,...&Zhan,Hu.(2016).TESTING LSST DITHER STRATEGIES FOR SURVEY UNIFORMITY AND LARGE-SCALE STRUCTURE SYSTEMATICS.ASTROPHYSICAL JOURNAL,829(1). |
| MLA | Awan, Humna,et al."TESTING LSST DITHER STRATEGIES FOR SURVEY UNIFORMITY AND LARGE-SCALE STRUCTURE SYSTEMATICS".ASTROPHYSICAL JOURNAL 829.1(2016). |
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来源：国家天文台
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