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	Towards understanding the planck thermal dust models
	Liu, Hao1,2,3; von Hausegger, Sebastian1,2; Naselsky, Pavel1,2
刊名	Physical review d
	2017-05-30
卷号	95期号:10页码:7
ISSN号	2470-0010
DOI	10.1103/physrevd.95.103517
通讯作者	Liu, hao(liuhao@nbi.dk)
英文摘要	Understanding the properties of dust emission in the microwave domain is an important premise for the next generation of cosmic microwave background (cmb) experiments, devoted to the measurement of the primordial b-modes of polarization. in this paper, we compare three solutions to thermal dust emission by the planck collaboration [a. abergel, p. a. r. ade et al. (planck collaboration), astron. astrophys. 571, a11 (2014)., r. adam, p. a. r. ade et al. (planck collaboration), astron. astrophys. 594, a10 (2016)., n. aghanim, m. ashdown et al. (planck collaboration), astron. astrophys. 596, a109 (2016).] to point out significant differences between their respective parameters (the spectral index beta, the optical depth tau, and the dust temperature t-d). these differences originate from, e. g., the priors on the parameters or the contribution of the cosmic infrared background (cib). in addition to investigating the angular distributions and statistical properties of each of the beta, tau, and t-d-maps for the whole sky, we also compute crosscorrelations among the maps, specifically the beta - t-d and tau -t-d correlations. all power spectra differ noticeably from each other, which we claim is partly due to the influence of the cib. peculiar behavior in the cross-correlations at dust temperatures greater than or similar to 21 k supports this claim; the precise differences depend on the particular solutions considered. finally, by the example of two zones on the sky (the bicep2 zone and a region around the north celestial pole), we show that not only the properties of dust are different in these regions on the sky, but moreover the dust emission products do not agree. furthermore, it is illustrated that the use of average values for dust parameters in one zone will not necessarily be applicable to another zone. in this context, we therefore recommend pixel-based approaches for future analyses, with less stringent constraints in form of priors, despite its higher computational expenditure, and an inclusion of a cib treatment, which finally allows for a direction dependent removal of dust foregrounds. the central statement of this brief analysis is that while all available solutions are in rough agreement at similar to 5%-20%, further progress must be made to match the goals of planned b-mode experiments.
WOS关键词	INTERSTELLAR DUST ; POWER SPECTRUM ; EMISSION ; POLARIZATION ; LITEBIRD
WOS研究方向	Astronomy & Astrophysics ; Physics
WOS类目	Astronomy & Astrophysics ; Physics, Particles & Fields
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000402473700006
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177386
专题	高能物理研究所
通讯作者	Liu, Hao
作者单位	1.Niels Bohr Inst, Blegdamsvej 17, DK-2100 Copenhagen, Denmark 2.Discovery Ctr, Blegdamsvej 17, DK-2100 Copenhagen, Denmark 3.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle & Astrophys, 19B YuQuan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hao,von Hausegger, Sebastian,Naselsky, Pavel. Towards understanding the planck thermal dust models[J]. Physical review d,2017,95(10):7.
APA	Liu, Hao,von Hausegger, Sebastian,&Naselsky, Pavel.(2017).Towards understanding the planck thermal dust models.Physical review d,95(10),7.
MLA	Liu, Hao,et al."Towards understanding the planck thermal dust models".Physical review d 95.10(2017):7.

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