10 research outputs found
Evolutionary Status of Brightest and Youngest Source in the Orion Molecular Cloud-3 Region
Full text linkThe brightest continuum source in the Orion Molecular Cloud-3 region (OMC-3),
MMS 6, was observed with the Very Large Array (VLA), the Nobeyama Millimeter
Array (NMA), and the Submillimeter Array (SMA). Our data were supplemented by
near- to mid-infrared archival data taken by Spitzer Space Telescope. The
compact continuum source, MMS 6-main, was detected with an H_2 mass of 3.0 Msun
with a size of 510 AU. Despite its compact and well condensed appearance,
neither clear CO outflow, radio jet, nor infrared sources (at a wave-length
shorter than 8 um) were detected at MMS 6-main even with the present
high-spatial resolution and high-sensitivity observations. The derived H_2
column density, 2.6x10^25 cm^-2, corresponds to a visual extinction of
A_v~15000 mag., and the derived number density is at least two orders of
magnitude higher than for the other OMC-2/3 continuum sources. The volume
density profile of the source was estimated to have a power-law index of 2 or
steeper down to a radius of ~450 AU. The time scale to form a protostar at the
center or the time scale elapsed after its formation is estimated to be 830 to
7600 yr. This is much shorter than the typical lifetime of the Class 0/I
protostars, which is ~10^(4-5) yr, suggesting that MMS 6-main is probably in
either the earliest stage of the proto-stellar core or in the latest stage of
the pre-stellar phase.Comment: 34 pages, 7 figures, accepted to Ap
Intention to return to the town of Tomioka in residents 7 years after the accident at Fukushima Daiichi Nuclear Power Station: a cross-sectional study
Get PDFThe aim of our study was to identify the factors associated with intention to return (ITR) in residents of Tomioka town, Fukushima Prefecture. We contacted approximated 8000 residents aged 20 years or older who lived in Tomioka. We invited them to take part in a written survey on ITR. In all, 1749 residents\u27 replies were included in the analysis. We asked about ITR in former residents of Tomioka town. We also asked about relevant factors and about risk perception in relation to the health effects of radiation exposure. Of those contacted, 469 (26.8%) had an ITR. Logistic regression analysis revealed that being male (OR = 1.6, 95% Cl: 1.24-1.96, P < 0.001),the anticipation of improving shopping in the town (OR = 1.5, 95% Cl: 1.26-1.67, P < 0.001) and requests for individual consultation with experts on the health effects of radiation (OR = 2.7, 95% Cl: 2.10-3.48, P <0.001) were associated with the ITR (+), and living with children under 18 years of age (OR = 0.7, 95% Cl: 0.51-0.95, P = 0.023), reluctance to drink tap water (OR = 0.5, 95% Cl: 0.36-0.69, P < 0.001) and anxiety regarding genetic effects of radiation in the next generation (OR = 0.6, 95% Cl: 0.45-079, P <0.001) were associated with the ITR (-) to Tomioka town, independent of other covariates. To allay the anxieties of residents who have an ITR to their hometown, careful risk communication, including information on the potential effects of radiation on health, is important
Tuberculosis Exposure among Evacuees at a Shelter after Earthquake, Japan, 2011
Get PDFTuberculosis was diagnosed in a person who had stayed in a shelter after the 2011 Great East Japan Earthquake. A contact investigation showed that the prevalence of latent tuberculosis infection among other evacuees at the shelter was 20%. Our report underscores the importance of tuberculosis prevention and control after natural disasters
