2,371 research outputs found
A new, large-scale map of interstellar reddening derived from HI emission
We present a new map of interstellar reddening, covering the 39\% of the sky
with low {\rm HI} column densities (
or ) at resolution, based on
all-sky observations of Galactic HI emission by the HI4PI Survey. In this low
column density regime, we derive a characteristic value of for gas with and find no significant reddening associated with gas at
higher velocities. We compare our HI-based reddening map with the Schlegel,
Finkbeiner, and Davis (1998, SFD) reddening map and find them consistent to
within a scatter of . Further, the differences between our
map and the SFD map are in excellent agreement with the low resolution
() corrections to the SFD map derived by Peek and Graves
(2010) based on observed reddening toward passive galaxies. We therefore argue
that our HI-based map provides the most accurate interstellar reddening
estimates in the low column density regime to date. Our reddening map is made
publicly available (http://dx.doi.org/10.7910/DVN/AFJNWJ).Comment: Re-submitted to ApJ. The reddening map is available at
http://dx.doi.org/10.7910/DVN/AFJNW
Blurred Boundaries: Interpreters as Researchers in Cross-Cultural Settings
This is a study of ambiguities and tensions that occur within the role of the bilingual/bicultural researcher in an ethnographic study. This manuscript presents an analysis of three instances from two interviews in a study on the acculturation of deaf students in deaf kindergarten classrooms in Japan and the US. This is an auto-ethnographic analysis of conflicts found in fluctuating between multiple roles: research assistant, interpreter, cultural mediator, and sociolinguistic consultant. In these examples my bicultural knowledge allowed me to identify “hidden” meanings overlooked by other members of the research team. However, my interpreter role at times made it awkward to contribute my insights to the research team. The findings of this study show that interpreters who are linguistically and culturally in-between the researchers and researched play a crucial but delicate role in cross-cultural studies
“Will you help me with my homework?”: A Case Use of Visual Methodologies in Research with (Deaf) Children
This is an analysis of a qualitative study and the visually compelling methodology that aimed to create child-friendly/child-inclusive research conducted with deaf children. The researcher engaged in one-on-one and focus group interviews with young deaf children, ages 6 to 12 years old, in signing, deaf schools around the United States. The methodology employed a combination of videos, pictures, and modeling to portray the abstract concept of “research” and participation in research as a means to informed consent and to engage children in the task of considering personal reflections compared to others’ experiences. This article reviews techniques applied and the resulting effect, explicit and implicit, on data generation. The resulting discussion from this study of method provides implications and a recommendation on the implementation of visual-verbal assent in future research with children, specifically deaf children
I Found a Boot
A hardworking and well-worn boot, complete with intense personality from shadow and much texture. Its very appearance spoke volumes to me. I wonder if the person who lost it shares the same intensity and texture
Extreme Starlight Polarization in a Region with Highly Polarized Dust Emission
Galactic dust emission is polarized at unexpectedly high levels, as revealed
by Planck. The origin of the observed polarization fractions can
be identified by characterizing the properties of optical starlight
polarization in a region with maximally polarized dust emission. We measure the
R-band linear polarization of 22 stars in a region with a submillimeter
polarization fraction of . A subset of 6 stars is also measured in
the B, V and I bands to investigate the wavelength dependence of polarization.
We find that starlight is polarized at correspondingly high levels. Through
multiband polarimetry we find that the high polarization fractions are unlikely
to arise from unusual dust properties, such as enhanced grain alignment.
Instead, a favorable magnetic field geometry is the most likely explanation,
and is supported by observational probes of the magnetic field morphology. The
observed starlight polarization exceeds the classical upper limit of
%mag and is at least
as high as 13%mag that was inferred from a joint analysis of Planck
data, starlight polarization and reddening measurements. Thus, we confirm that
the intrinsic polarizing ability of dust grains at optical wavelengths has long
been underestimated.Comment: Accepted by A&AL, data to appear on CDS after publication. 6 page
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