Probing the Universe's Tilt with the Cosmic Infrared Background Dipole

Conventional interpretation of the observed cosmic microwave background (CMB) dipole is that all of it is produced by local peculiar motions. Alternative explanations requiring part of the dipole to be primordial have received support from measurements of large-scale bulk flows. A test of the two hypothesis is whether other cosmic dipoles produced by collapsed structures later than last scattering coincide with the CMB dipole. One background is the cosmic infrared background (CIB) whose absolute spectrum was measured to ~30% by the COBE satellite. Over the 100 to 500 {\mu}m wavelength range its spectral energy distribution can provide a probe of its alignment with CMB. This is tested with the COBE FIRAS dataset which is available for such a measurement because of its low noise and frequency resolution important for Galaxy subtraction. Although the FIRAS instrument noise is in principle low enough to determine the CIB dipole, the Galactic foreground is sufficiently close spectrally to keep the CIB dipole hidden. A similar analysis is performed with DIRBE, which - because of the limited frequency coverage - provides a poorer a dataset. We discuss strategies for measuring the CIB dipole with future instruments to probe the tilt and apply it to the Planck, Herschel and the proposed Pixie missions. We demonstrate that a future FIRAS-like instrument with instrument noise a factor of ~10 lower than FIRAS would make a statistically significant measurement of the CIB dipole. We find that the Planck and Herschel data sets will not allow a robust CIB dipole measurement. The Pixie instrument promises a determination of the CIB dipole and its alignment with either the CMB dipole or the dipole galaxy acceleration vector.Comment: 9 pages 9 figure

Fragile minds, porous selves: Shining a light on autoethnography of mental illness

This article sheds light on autoethnographic accounts of mental illness, to address author and reader concerns and questions and to consider what practitioners can learn from these narrative accounts. Drawing from my own and others’ trajectories, I discuss the drawbacks and dangers of exposing a ‘flawed’ identity, the stigma of serious mental illness, intertextuality issues, the tangled nature of revelation and redemption, framing the ‘Other’ in mental illness autoethnography and depictions of ‘life in the asylum.’ I explain how in telling my own ‘psychiatric’ tale, I looked to the symbolic concept of ‘communitas’ as a means of examining inter-relational processes and collective experience in a psychiatric facility. I argue that, while the act of writing about one’s illness experience can be rightly perceived as a way of reclaiming personal ‘power’ and facilitating healing, attempts to ‘evidence’ recovery can run counter to the writer’s reality of life with or beyond mental illness as personally and socially messy. In answer to the question, ‘at what point does a ‘life in the asylum’ narrative become autoethnographic?' I argue for the potential of autoethnography to contribute to broader sociological, ethnographic and medical debates and thus impact on policy. Speaking up about mental health through autoethnography can help to promote awareness of the unpredictability and socially constructed nature of mental illness and can inform strategies toward reducing public stigma, tackle the cyclical impact of labels, highlight the need to change social and medical attitudes, and revisualize treatment and support

ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz

The ARCADE 2 instrument has measured the absolute temperature of the sky at frequencies 3, 8, 10, 30, and 90 GHz, using an open-aperture cryogenic instrument observing at balloon altitudes with no emissive windows between the beam-forming optics and the sky. An external blackbody calibrator provides an {\it in situ} reference. Systematic errors were greatly reduced by using differential radiometers and cooling all critical components to physical temperatures approximating the CMB temperature. A linear model is used to compare the output of each radiometer to a set of thermometers on the instrument. Small corrections are made for the residual emission from the flight train, balloon, atmosphere, and foreground Galactic emission. The ARCADE 2 data alone show an extragalactic rise of $50\pm7$ mK at 3.3 GHz in addition to a CMB temperature of $2.730\pm .004$ K. Combining the ARCADE 2 data with data from the literature shows a background power law spectrum of $T=1.26\pm 0.09$ [K] $(\nu/\nu_0)^{-2.60\pm 0.04}$ from 22 MHz to 10 GHz ($\nu_0=1$ GHz) in addition to a CMB temperature of $2.725\pm .001$ K.Comment: 11 pages 5 figures Submitted to Ap

ARCADE: Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission

The Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE) is a balloon-borne instrument designed to measure the temperature of the cosmic microwave background at centimeter wavelengths. ARCADE searches for deviations from a blackbody spectrum resulting from energy releases in the early universe. Long-wavelength distortions in the CMB spectrum are expected in all viable cosmological models. Detecting these distortions or showing that they do not exist is an important step for understanding the early universe. We describe the ARCADE instrument design, current status, and future plans.Comment: 12 pages, 6 figures. Proceedings of the Fundamental Physics With CMB workshop, UC Irvine, March 23-25, 2006, to be published in New Astronomy Review

Polarization Properties of A Multi-Moded Concentrator

We present the design and performance of a non-imaging concentrator for use in broad-band polarimetry at millimeter through submillimeter wavelengths. A rectangular geometry preserves the input polarization state as the concentrator couples f/2 incident optics to a 2 pi sr detector. Measurements of the co-polar and cross-polar beams in both the few-mode and highly over-moded limits agree with a simple model based on mode truncation. The measured co-polar beam pattern is nearly independent of frequency in both linear polarizations. The cross-polar beam pattern is dominated by a uniform term corresponding to polarization efficiency 94%. After correcting for efficiency, the remaining cross-polar response is -18 dB.Comment: 9 pages including 8 figures. Accepted for publication in the Journal of the Optical Society of America

A Low Noise Thermometer Readout for Ruthenium Oxide Resistors

The thermometer and thermal control system, for the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE) experiment, is described, including the design, testing, and results from the first flight of ARCADE. The noise is equivalent to about 1 Omega or 0.15 mK in a second for the RuO_2 resistive thermometers at 2.7 K. The average power dissipation in each thermometer is 1 nW. The control system can take full advantage of the thermometers to maintain stable temperatures. Systematic effects are still under investigation, but the measured precision and accuracy are sufficient to allow measurement of the cosmic background spectrum. Journal-ref: Review of Scientific Instruments Vol 73 #10 (Oct 2002)Comment: 5 pages text 7 figure

The Social Construction of a Concept- Orthorexia Nervosa: Morality Narratives and Psycho-politics

Our article explores orthorexia nervosa (ON) – an extreme fixation with healthy eating- from a social construction perspective. Interviews with people self-identified as “obsessed” with healthy eating or having ON (“Identifiers”) and non-medical professionals working with ON (“Professionals”) were comparatively analyzed, along with orthorexia threads from an eating disorder website (“Posters”). Participants made sense of and rationalized their attitudes and feelings concerning healthy eating and aligned themselves according to their interests. Identifiers and Posters applauded “healthy eating” and regarded consumption of “impure” foods as leading to ill-health. Some framed their dietary discipline within an ethically motivated lifestyle, others were preoccupied with appearance or weight management. Professionals expressed concern for, and disapproval of, extreme views and behaviors in clients and parental and social influences supporting them. Debates surrounding orthorexic practices are tangled; some individuals need help, yet dangers lie in over medicalising or “troubling” what may be a preferred lifestyle

Weathering the storm: A qualitative study of social prescribing in urban and rural Scotland during the COVID-19 pandemic

Objectives The non-clinical approach known as social prescribing aims to tackle multi-morbidity, reduce GP workload and promote wellbeing by directing patients to community services. Usual in-person modes of delivery of social prescribing have been virtually impossible under social distancing rules. Our study qualitatively examined and compared the responses of three social prescribing schemes in Scotland to the Covid-19 pandemic. Methods We interviewed a theoretical sample of 23 stakeholders of urban and rural social prescribing schemes at the start of Covid-19 pandemic. Follow up interviews with a representative sample were conducted around ten months later. Interviewees included social prescribing coordinators (SPCs) GPs, managers, researchers and representatives of third sector organizations. Interview transcripts were analysed in stages and an inductive approach to coding was supported by NVivo. Results Findings revealed a complex social prescribing landscape in Scotland with schemes funded, structured and delivering services, in diverse ways. Across all schemes, working effectively during the pandemic and shifting to online delivery had been challenging and demanding, however their priorities in response to the pandemic had differed. With GP time and services stretched to limits, GP practice-attached ‘Link Workers’ had taken on counselling and advocacy roles, sometimes for serious mental health cases. Community-based SPCs had mostly assumed a health education role, and those on the Western Isles of Scotland a digital support role. In both rural or urban areas, combatting loneliness and isolation- especially given social distancing- remained a pivotal aspect of the SPC role. Conclusions Our study highlights significant challenges and shifts in focus in social prescribing in response to the pandemic. Use of multiple digital technologies has assumed a central role in social prescribing and this situation seems likely to remain. With statutory and non-statutory services stretched to their limits, there is a danger of SPCs assuming new tasks without adequate training or support