&lt;title&gt;Exploring ultraviolet astronomical polarimetry: results from the Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE)&lt;/title&gt;

Nordsieck, K. H.; Code, A. D.; Anderson, Christopher M.; Meade, M. R.; Babler, B.; Michalski, D. E.; Pfeifer, R. H.; Jones, T. E.

doi:10.1117/12.168568

Cited by 23 publications

(5 citation statements)

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“…They are attractive because of their simplicity and compactness, what explains their use in such fields as astronomy [1,2]. These remarks remain correct also for combinations of gratings and prisms.…”

Section: Introductionmentioning

confidence: 91%

Optical schemes of spectrographs with a diffractive optical element in a converging beam

Muslimov

Pavlycheva

2015

J. Eur. Opt. Soc.-Rapid Publ.

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Optical schemes of spectrographs based on transmission concave holographic gratings working in converging beams are considered. General description of the design techniques are provided. Each of them is supported by a certain example with calculation and modeling results. In particular, it's shown that combination of such element with a spherical wedge allows to create a spectrograph with correction of astigmatism and a variable-dispersion spectrograph.

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Section: Introductionmentioning

confidence: 91%

Optical schemes of spectrographs with a diffractive optical element in a converging beam

Muslimov

Pavlycheva

2015

J. Eur. Opt. Soc.-Rapid Publ.

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“…The current state-of-the-art in space UV polarimetry was set by the combination of two instruments: 1) the Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) which flew on the Space Shuttle as part of the Astro-1 and −2 missions (Nordsieck et al 1994) and 2) the Faint Object Spectrograph (FOS) aboard the Hubble Space Telescope (HST; e.g. Allen and Angel (1982), Clayton et al (1995)).…”

Section: The Need For Uv Polarimetry To Tackle Open Questions In Ism ...mentioning

confidence: 99%

Ultraviolet spectropolarimetry with polstar: interstellar medium science

Andersson

Clayton

Doney

et al. 2022

Astrophys Space Sci

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Continuum polarization over the UV-to-microwave range is due to dichroic extinction (or emission) by asymmetric, aligned dust grains. Scattering can also be an important source of polarization, especially at short wavelengths. Because of both grain alignment and scattering physics, the wavelength dependence of the polarization, generally, traces the size of the aligned grains. Similarly because of the differing wavelength dependencies of dichroic extinction and scattering polarization, the two can generally be reliably separated. Ultraviolet (UV) polarimetry therefore provides a unique probe of the smallest dust grains (diameter$< 0.09~\upmu \text{m}$ < 0.09 μm ), their mineralogy and interaction with the environment. However, the current observational status of interstellar UV polarization is very poor with less than 30 lines of sight probed. With the modern, quantitative and well-tested, theory of interstellar grain alignment now available, we have the opportunity to advance the understanding of the interstellar medium (ISM) by executing a systematic study of the UV polarization in the ISM of the Milky Way and near-by galaxies. The Polstar mission will provide the sensitivity and observing time needed to carry out such a program (probing hundreds of stars in the Milky Way and dozens of stars in the LMC/SMC), addressing questions of dust composition as a function of size and location, radiation- and magnetic-field characteristics as well as unveiling the carrier of the 2175 Å extinction feature. In addition, using high-resolution UV line spectroscopy Polstar will search for and probe the alignment of, and polarization from, aligned atoms and ions - so called “Ground State Alignment”, a potentially powerful new probe of magnetic fields in the diffuse ISM.

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“…1). To account for the UV band, we retrieved the old and unpublished polarization measurements taken by the Wisconsin Ultraviolet Photo Polarimeter Experiment (WUPPE, Code et al 1993;Nordsieck et al 1994). Five polarimetric observations in the 0.15 -0.32 µm band were obtained with WUPPE and compiled by the WUPPE team into a 3136 seconds long exposure spectrum visible in Fig.…”

Section: Compiling the Datamentioning

confidence: 99%

The polarized spectral energy distribution of NGC 4151

Marin,

Cam,

Lopez-Rodriguez

et al. 2020

Preprint

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NGC 4151 is among the most well-studied Seyfert galaxies that does not suffer from strong obscuration along the observer's line-of-sight. This allows to probe the central active galactic nucleus (AGN) engine with photometry, spectroscopy, reverberation mapping or interferometry. Yet, the broadband polarization from NGC 4151 has been poorly examined in the past despite the fact that polarimetry gives us a much cleaner view of the AGN physics than photometry or spectroscopy alone. In this paper, we compile the 0.15 -89.0 µm total and polarized fluxes of NGC 4151 from archival and new data in order to examine the physical processes at work in the heart of this AGN. We demonstrate that, from the optical to the near-infrared (IR) band, the polarized spectrum of NGC 4151 shows a much bluer power-law spectral index than that of the total flux, corroborating the presence of an optically thick, locally heated accretion flow, at least in its near-IR emitting radii. Specific signatures from the atmosphere of the accretion structure are tentatively found at the shortest ultraviolet (UV) wavelengths, before the onset of absorption opacity. Otherwise, dust scattering appears to be the dominant contributor from the near-UV to near-IR polarized spectrum, superimposed onto a weaker electron component. We also identify a change in the polarization processes from the near-IR to the mid-IR, most likely associated with the transition from Mie scattering to dichroic absorption from aligned dust grains in the dusty torus or narrow-line region. Finally, we present and discuss the very first far-infrared polarization measurement of NGC 4151 at 89 µm.

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<title>Exploring ultraviolet astronomical polarimetry: results from the Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE)</title>

Cited by 23 publications

References 0 publications

Optical schemes of spectrographs with a diffractive optical element in a converging beam

Optical schemes of spectrographs with a diffractive optical element in a converging beam

Ultraviolet spectropolarimetry with polstar: interstellar medium science

The polarized spectral energy distribution of NGC 4151

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