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- Thomas, Guillaume F., et al.
(författare)
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The Hidden Past of M92 : Detection and Characterization of a Newly Formed 17 degrees Long Stellar Stream Using the Canada-France Imaging Survey
- 2020
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 902:2
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Tidskriftsartikel (refereegranskat)abstract
- We present an analysis of the structure, kinematics, and orbit of a newly found stellar stream emanating from the globular cluster M92 (NGC 6341). This stream was discovered in an improved matched-filter map of the outer Galaxy, based on a color-color-magnitude diagram, created using photometry from the Canada-France Imaging Survey and the Pan-STARRS 1 3 pi survey. We find the stream to have a length of 17 degrees (2.5 kpc at the distance of M92), a width dispersion of 029(42 pc), and a stellar mass of [3.17 0.89] x 10(4)M(10% of the stellar mass of the current main body of M92). We examine the kinematics of main-sequence, red giant, and blue horizontal branch stars belonging to the stream and that have proper motion measurements from the second data release of Gaia.N-body simulations suggest that the stream was likely formed very recently (during the last similar to 500 Myr) forcing us to question the orbital origin of this ancient, metal-poor globular cluster.
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| 2. |
- Vingeliene, Snieguole, 1985-, et al.
(författare)
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Atopic dermatitis, systemic inflammation and subsequent dementia risk
- 2023
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Ingår i: JEADV Clinical Practice. - 2768-6566. ; 2:4, s. 839-848
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Tidskriftsartikel (refereegranskat)abstract
- Background: Atopic dermatitis is a chronic inflammatory skin disease and inflammation has been implicated in development of other chronic diseases, but few studies have examined the relationship with dementia.Objectives: This study examines associations of atopic dermatitis (AD) and systemic inflammation in adolescence measured using erythrocyte sedimenta-tion rate (ESR), as well as AD diagnosed in adulthood, with dementia risk.Methods: We used three Swedish register‐based cohorts. Cohort I (N= 795,680) comprised men, born in 1951–1968, who participated in themilitary conscription examinations with physician‐assessed AD and ESR; Cohort II (N= 1,757,600) included men and women, born in 1951–1968; and Cohort III (N= 3,988,783) included all individuals in Sweden, born in 1930–1968. We used Cox regression, estimating hazard ratios (HR), with thefollow‐up from 50 years of age to dementia diagnosis, date of emigration, death, or 31 December 2018, which ever occurred first. Further, we used asibling comparison design to adjust for unmeasured confounders shared among siblings.Results: Cohort I: 1466 dementia events were accrued during follow‐up of 7.8 years, with a crude rate of 21.6 [95% confidence interval (CI): 20.6, 22.8] per 100,000 person‐years. Cohort II: 3549 dementia events were accrued duringfollow‐up of 7.4 years, with a crude rate of 23.7 (95% CI: 22.9, 24.5) per 100,000 person‐years. Cohort III: 120,303 dementia events were accrued during follow‐up of 23.7 years, with a crude rate of 180.3 (95% CI: 179.3, 181.3) per 100,000 person‐years. In multivariable analysis using Cohort I, there was no association between AD and dementia [HR 0.68 (95% CI 0.32, 1.43)], norwith moderate [HR 0.71 (95% CI: 0.46, 1.10)] or high [HR 1.23 (95% CI: 0.87, 1.75)] ESR. AD was not associated with dementia risk in Cohort II [HR 1.28(0.97, 1.71)] or Cohort III [HR 1.01 (0.92, 1.11)].Conclusions: AD was not associated with dementia risk, neither was systemic inflammation measured by ESR in adolescence.
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