3D Astrophysics Newsletter

2017_7_3_diemer7.3 Todays new entry:

The Fabric of the Universe: Exploring the cosmic web in 3D prints and woven textiles

Benedikt Diemer & Isaac Facio

Abstract: We introduce The Fabric of the Universe, an art and science collaboration focused on exploring the cosmic web of dark matter with unconventional techniques and materials. We discuss two of our projects in detail. First, we describe a pipeline for translating three-dimensional density structures from N-body simulations into solid surfaces suitable for 3D printing, and present prints of a cosmological volume and of the infall region around a massive cluster halo. In these models, we discover wall-like features that are invisible in two-dimensional projections. Going beyond the sheer visualization of simulation data, we undertake an exploration of the cosmic web as a three-dimensional woven textile. To this end, we develop experimental 3D weaving techniques to create sphere-like and filamentary shapes and radically simplify a region of the cosmic web into a set of filaments and halos. We translate the resulting tree structure into a series of commands that can be executed by a digital weaving machine, and describe the resulting large-scale textile installation.

Journal: arXiv preprint server
URL of preprint: https://arxiv.org/abs/1702.03897
Submitted by: Benedikt Diemer

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3D Astrophysics Newsletter

2017_7_2_pomarede7.2 Today´s new entry:

Cosmography and Data Visualization

Daniel Pomarede, Helene M. Courtois, Yehuda Hoffman, R. Brent Tully

Abstract: Cosmography, the study and making of maps of the universe or cosmos, is a field where visual representation benefits from modern three-dimensional visualization techniques and media. At the extragalactic distance scales, visualization is contributing in understanding the complex structure of the local universe, in terms of spatial distribution and flows of galaxies and dark matter. In this paper, we report advances in the field of extragalactic cosmography obtained using the SDvision visualization software in the context of the Cosmicflows Project. Here, multiple visualization techniques are applied to a variety of data products: catalogs of galaxy positions and galaxy peculiar velocities, reconstructed velocity field, density field, gravitational potential field, velocity shear tensor viewed in terms of its eigenvalues and eigenvectors, envelope surfaces enclosing basins of attraction. These visualizations, implemented as high-resolution images, videos, and interactive viewers, have contributed to a number of studies: the cosmography of the local part of the universe, the nature of the Great Attractor, the discovery of the boundaries of our home supercluster of galaxies Laniakea, the mapping of the cosmic web, the study of attractors and repellers.

Journal or Name of Publication: PASP Special Focus Issue: Techniques and Methods for Astrophysical Data Visualization, in press
URL of preprint: https://arxiv.org/abs/1702.01941
Submitted by: Daniel Pomarede

3D Astrophysics Newsletter

2017_sabin_2507.1 Today´s new entry:

Catching a Grown-Up Starfish Planetary Nebula: I. Morpho-Kinematical study of PC 22

Sabin L., Gómez-Muñoz M. A., Guerrero M. A., Zavala S., Ramos-Larios G., Vázquez R., Corral L., Blanco Cárdenas M.W., Guillén P.F., Olguín L., Morisset C., Navarro S.

Abstract: We present the first part of an investigation on the planetary nebula (PN) PC 22 which focuses on the use of deep imaging and high resolution echelle spectroscopy to perform a detailed morpho-kinematical analysis. PC 22 is revealed to be a multipolar PN emitting predominantly in [O III] and displaying multiple non-symmetric outflows. Its central region is found to be also particularly inhomogeneous with a series of low ionization structures (knots) located on the path of the outflows. The morpho-kinematical model obtained with SHAPE indicates that i) the de-projected velocities of the outflows are rather large, > 100 km/s, while the central region has expansion velocities in the range ~25 to ~45 km/s following the “Wilson effect”, ii) the majority of the measured structures share similar inclination, ~100 degrees, i.e. they are coplanar, and iii) all outflows and lobes are coeval (within the uncertainties). All these results make us to suggest that PC 22 is an evolved starfish PN. We propose that the mechanism responsible for the morphology of PC 22 consists of a wind-shell interaction, where the fast post-AGB wind flows through a filamentary AGB shell with some large voids.

Journal: Monthly Notices of the Royal Astronomical Society, in press
Comments: 11 pages, 9 figures, Rep.Fig.7
URL of preprint: http://arxiv.org/abs/1702.00029
Submitted by: Laurence Sabin