NAOC Open IR
A Cuspy Dark Matter Halo
Shi, Yong1,2; Zhang, Zhi-Yu1,2; Wang, Junzhi3; Chen, Jianhang1; Gu, Qiusheng1; Yu, Xiaoling1; Li, Songlin1
2021-03-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume909Issue:1Pages:20
AbstractThe cusp-core problem is one of the main challenges of the cold dark matter paradigm on small scales; the density of a dark matter halo is predicted to rise rapidly toward the center as rho(r) proportional to r(alpha) with alpha between -1 and -1.5, while such a cuspy profile has not been clearly observed. We have carried out the spatially resolved mapping of gas dynamics toward a nearby ultradiffuse galaxy (UDG), AGC 242019. The derived rotation curve of dark matter is well fitted by the cuspy profile as described by the Navarro-Frenk-White model, while the cored profiles including both the pseudo-isothermal and Burkert models are excluded. The halo has alpha = -(0.90 0.08) at the innermost radius of 0.67 kpc, M-halo = (3.5 1.2) x 10(10) M, and a small concentration of 2.0 0.36. The UDG AGC 242019 challenges alternatives of cold dark matter by constraining the particle mass of fuzzy dark matter to be 3.3 x 10(-22) eV, the cross section of self-interacting dark matter to be <1.63 cm(2) g(-1), and the particle mass of warm dark matter to be >0.23 keV, all of which are in tension with other constraints. The modified Newtonian dynamics is also inconsistent with a shallow radial acceleration relationship of AGC 242019. For the feedback scenario that transforms a cusp to a core, AGC 242019 disagrees with the stellar-to-halo mass ratio dependent model but agrees with the star formation threshold dependent model. As a UDG, AGC 242019 is in a dwarf-sized halo with weak stellar feedback, late formation time, normal baryonic spin, and low star formation efficiency (SFR/gas).
KeywordGalaxy dynamics Interstellar atomic gas Galaxy dark matter halos Dark matter density Dwarf galaxies
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC
DOI10.3847/1538-4357/abd777
Language英语
Funding ProjectNational Key R&D Program of China[2018YFA0404502] ; National Key R&D Program of China[2017YFA0402704] ; National Natural Science Foundation of China (NSFC)[11825302] ; National Natural Science Foundation of China (NSFC)[11733002] ; National Natural Science Foundation of China (NSFC)[11773013] ; Tencent Foundation through the XPLORER PRIZE ; NSFC[11590783]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; NSFC ; NSFC
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000624510300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79602
Collection中国科学院国家天文台
Corresponding AuthorShi, Yong
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Shanghai, Peoples R China
Recommended Citation
GB/T 7714
Shi, Yong,Zhang, Zhi-Yu,Wang, Junzhi,et al. A Cuspy Dark Matter Halo[J]. ASTROPHYSICAL JOURNAL,2021,909(1):20.
APA Shi, Yong.,Zhang, Zhi-Yu.,Wang, Junzhi.,Chen, Jianhang.,Gu, Qiusheng.,...&Li, Songlin.(2021).A Cuspy Dark Matter Halo.ASTROPHYSICAL JOURNAL,909(1),20.
MLA Shi, Yong,et al."A Cuspy Dark Matter Halo".ASTROPHYSICAL JOURNAL 909.1(2021):20.
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