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 ($N_{\rm HI} < 4\times10^{20}\,\rm cm^{-2}$ or $E(B-V)\approx 45\rm\, mmag$) at $16\overset{'}{.}1$ 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 $N_{\rm HI}/E(B-V) = 8.8\times10^{21}\, \rm\, cm^{2}\, mag^{-1}$ for gas with $|v_{\rm LSR}| < 90\,\rm km\, s^{-1}$ 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 $\simeq 5\,\rm mmag$. Further, the differences between our map and the SFD map are in excellent agreement with the low resolution ($4\overset{\circ}{.}5$) 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 $\simeq 20\%$ 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 $\simeq 20$. 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 $\left[p_V/E\left(B-V\right)\right]_{\rm max} = 9$%mag$^{-1}$ and is at least as high as 13%mag$^{-1}$ 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