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The properties of filamentary interstellar clouds observed at sub-millimetre wavelengths, especially by the Herschel Space Observatory, are analysed with polytropic models in cylindrical symmetry. The observed radial density profiles are…

Solar and Stellar Astrophysics · Physics 2015-06-23 Claudia Toci , Daniele Galli

We present a statistical study of the filamentary structures of the cosmic web in the large hydro-dynamical simulations Illustris-TNG, Illustris, and Magneticum at redshift z=0. We focus on the radial distribution of the galaxy density…

Cosmology and Nongalactic Astrophysics · Physics 2020-09-30 Daniela Galárraga-Espinosa , Nabila Aghanim , Mathieu Langer , Céline Gouin , Nicola Malavasi

In recent high resolution N-body CDM simulations, it has been had found that nonsingular three-parameter models, e.g. the Einasto profile has a better performance better than the singular two-parameter models, e.g. the Navarro, Frenk and…

Cosmology and Nongalactic Astrophysics · Physics 2011-08-25 E. Retana-Montenegro , F. Frutos-Alfaro

Aims. This work provides an analysis of how the galaxy number density of the input data affects the filaments detected with the Bisous filament finder and gives estimates of the reliability of the method itself to assess the robustness of…

Cosmology and Nongalactic Astrophysics · Physics 2021-05-26 Moorits Mihkel Muru , Elmo Tempel

Cosmic filaments, the most prominent features of the cosmic web, possibly hold untapped potential for cosmological inference. While it is natural to expect the structure of filaments to show universality similar to that seen in dark matter…

Cosmology and Nongalactic Astrophysics · Physics 2024-09-20 Saee Dhawalikar , Aseem Paranjape

The E/SO sequence of a cluster defines a boundary redward of which a reliable weak lensing signal can be obtained from background galaxies, uncontaminated by cluster members. For bluer colors, both background and cluster members are…

The thermal emission of dust is one of the most important tracers of the interstellar medium: multi-wavelength photometry in the far-infrared (FIR) and submillimeter (submm) can be fitted with a model, providing estimates of the dust mass.…

Astrophysics of Galaxies · Physics 2020-10-07 Lapo Fanciullo , Francisca Kemper , Peter Scicluna , Thavisha E. Dharmawardena , Sundar Srinivasan

We apply a flexible parametric model, a combination of generalized Plummer profiles, to infer the shapes of the stellar density profiles of the Milky Way's satellite dwarf spheroidal galaxies (dSphs). We apply this model to 40 dSphs using…

Astrophysics of Galaxies · Physics 2020-03-26 A. G. Moskowitz , M. G. Walker

We construct two linear filtering techniques based on weak gravitational lensing to constrain the inner slope $\alpha$ of the density profile of dark-matter halos. Both methods combine all available information into an estimate of this…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 M. Viola , M. Maturi , M. Bartelmann

In the context of the cosmological and constrained ELUCID simulation, this study explores the statistical characteristics of filaments within the cosmic web, focussing on aspects such as the distribution of filament lengths and their radial…

Cosmology and Nongalactic Astrophysics · Physics 2024-08-21 Youcai Zhang , Hong Guo , Xiaohu Yang , Peng Wang

Filaments are an important part of star-forming interstellar clouds. Theie properties hold clues to their formation mechanisms and role in the star-formation process. We compare the properties of filaments in the Orion Molecular Cloud 3…

Astrophysics of Galaxies · Physics 2023-03-15 M. Juvela , E. Mannfors

The realism of current models of the penumbra is assessed by comparing their predictions with the plasma properties of penumbral filaments as retrieved from spectropolarimetric observations. The spectropolarimeter onboard Hinode allows us…

Astrophysics · Physics 2009-11-13 J. Jurcak , L. R. Bellot Rubio

Dense filaments are believed to be representative of the initial conditions of star formation in molecular clouds. We have used the MIRI instrument on JWST to image the massive filament NGC6334M at d~1.3 kpc with unprecedented resolution…

Following from our recent work, we present a detailed analysis of star-formation and interstellar medium (ISM) scaling relations, done on a representative sample of nearby galaxies. H$\alpha$ images are analysed in order to derive the…

Astrophysics of Galaxies · Physics 2024-01-12 Bogdan A. Pastrav

We report on the weak lensing detection of a filament between two galaxy clusters at $z=0.55$, CL0015.9+1609 and RX J0018.3+1618. We conduct weak lensing analysis of deep multi-band Subaru/Suprime-Cam images with $Lensfit$. The weak lensing…

Cosmology and Nongalactic Astrophysics · Physics 2015-03-24 Yuichi Higuchi , Masamune Oguri , Masayuki Tanaka , Junya Sakurai

Large scale filaments, with lengths that can reach tens of Mpc, are the most prominent features in the cosmic web. These filaments have only been observed indirectly through the positions of galaxies in large galaxy surveys or through…

Cosmology and Nongalactic Astrophysics · Physics 2018-11-07 Robin Kooistra , Marta B. Silva , Saleem Zaroubi

Surface integrals on density level sets often appear in asymptotic results in nonparametric level set estimation (such as for confidence regions and bandwidth selection). Also surface integrals can be used to describe the shape of level…

Statistics Theory · Mathematics 2019-04-30 Wanli Qiao

Recent \herschel\ and \planck\ observations of submillimeter dust emission revealed the omnipresence of filamentary structures in the interstellar medium (ISM). The ubiquity of filaments in quiescent clouds as well as in star-forming…

Astrophysics of Galaxies · Physics 2017-12-05 Doris Arzoumanian

We report the first measurement of polarized thermal dust emission toward the entire early and massive Infrared Dark Cloud G11.11$-$0.12 taken by the polarimeter SOFIA/HAWC+ at 214 $\mu m$ wavelength. Magnetic fields (B-fields) obtained…