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We present multi-wavelength studies of optically-defined merging clusters, based on the Hyper Suprime-Cam Subaru Strategic Program. Luminous red galaxies, tracing cluster mass distributions, enable to identify cluster subhalos at various…

I review recent results derived from numerical simulations of the turbulent interstellar medium (ISM), in particular concerning the nature and formation of turbulent clouds, methods for comparing the structure in simulations and…

Astrophysics · Physics 2018-03-28 Enrique Vázquez-Semadeni

Projection tends to skew the mass-observable relation of galaxy clusters by creating a small fraction of severely blended systems, those for which the measured observable property of a cluster is strongly boosted relative to the value of…

Cosmology and Nongalactic Astrophysics · Physics 2012-04-04 Brandon M. S. Erickson , Carlos E. Cunha , August E. Evrard

The evolution of molecular clouds in galactic centres is thought to differ from that in galactic discs due to a significant influence of the external gravitational potential. We present a set of numerical simulations of molecular clouds…

Radiation feedback from young star clusters embedded in giant molecular clouds (GMCs) is believed to be important to the control of star formation. For the most massive and dense clouds, including those in which super star clusters (SSCs)…

Astrophysics of Galaxies · Physics 2015-09-09 M. Aaron Skinner , Eve C. Ostriker

We introduce a model for the large-scale, global 3D structure of molecular clouds. Motivated by the morphological appearance of clouds in surface density maps, we model clouds as cylinders, with the aim of backing out information about the…

Astrophysics of Galaxies · Physics 2023-09-12 Nia Imara , John C. Forbes

Bright sub-mm galaxies are expected to arise in massive highly-biased haloes, and hence exhibit strong clustering. We argue that a valuable tool for measuring these clustering properties is the cross-correlation of sub-mm galaxies with…

Astrophysics · Physics 2009-11-11 Chris Blake , Alexandra Pope , Douglas Scott , Bahram Mobasher

(Abridged) We explore the chemistry of the most abundant C, O, S, and N bearing species in molecular clouds, in the context of the IRAM 30 m Large Programme Gas phase Elemental abundances in Molecular Clouds (GEMS). In this work, we aim to…

The increasing complexity and interconnectedness of systems across various fields have led to a growing interest in studying complex networks, particularly Scale-Free (SF) networks, which best model real-world systems. This paper…

Systems and Control · Electrical Eng. & Systems 2026-01-05 Mohammadreza Doostmohammadian , Hamid R. Rabiee

If dark matter has a large self-interaction scattering cross section, then interactions among dark-matter particles will drive galaxy and cluster halos to become spherical in their centers. Work in the past has used this effect to rule out…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 Annika H. G. Peter , Miguel Rocha , James S. Bullock , Manoj Kaplinghat

The properties of substructure in galaxy clusters, exquisitely probed by gravitational lensing, offer a stringent test of dark matter (DM) models. Combining strong- and weak-lensing data for massive clusters, we map their total mass --…

Cosmology and Nongalactic Astrophysics · Physics 2026-05-12 Priyamvada Natarajan , Barry T. Chiang , Isaque Dutra

We present a set of numerical simulations addressing the effects of magnetic field strength and orientation on the flow-driven formation of molecular clouds. Fields perpendicular to the flows sweeping up the cloud can efficiently prevent…

Astrophysics · Physics 2011-02-11 F. Heitsch , J. M. Stone , L. W. Hartmann

The nature of cosmic rays (CRs) and cosmic ray transport in galaxy clusters is probed by a number of observations. Radio observations reveal the synchrotron radiation of cosmic ray electrons (CRe) spiraling around cluster magnetic fields.…

High Energy Astrophysical Phenomena · Physics 2019-06-26 Joshua Wiener , Ellen G. Zweibel

We review the progress made in understanding molecular cloud formation and evolution toward star formation since the first Crete conference in 1990. It now seems clear that molecular clouds in the Galaxy at least form from compressed HI…

Astrophysics · Physics 2009-09-25 Leo Blitz , Jonathan P. Williams

In order to understand the physical processes underlying clump formation in outflow from supercritical accretion flow, we performed two-dimensional radiation hydrodynamic (RHD) simulations. We focus our discussion on the nature of RHD…

High Energy Astrophysical Phenomena · Physics 2015-06-18 S. Takeuchi , K. Ohsuga , S. Mineshige

Cosmic rays (CRs) are the primary driver of ionization in star forming molecular clouds (MCs). Despite their potential impacts on gas dynamics and chemistry, no simulations of star cluster formation following the creation of individual…

Astrophysics of Galaxies · Physics 2024-07-26 Margot Fitz Axen , Stella Offner , Phillip F. Hopkins , Mark R. Krumholz , Michael Y. Grudic

Molecular clouds are turbulent structures whose star formation efficiency (SFE) is strongly affected by internal stellar feedback processes. In this paper we determine how sensitive the SFE of molecular clouds is to randomised inputs in the…

Astrophysics of Galaxies · Physics 2019-06-20 Sam Geen , Stuart K. Watson , Joakim Rosdahl , Rebekka Bieri , Ralf S. Klessen , Patrick Hennebelle

Clouds affected by solar eclipses could influence the reflection of sunlight back into space and might change local precipitation patterns. Satellite cloud retrievals have so far not taken into account the lunar shadow, hindering a reliable…

Atmospheric and Oceanic Physics · Physics 2024-02-14 Victor J. H. Trees , Stephan R. de Roode , Job I. Wiltink , Jan Fokke Meirink , Ping Wang , Piet Stammes , A. Pier Siebesma

The clustering properties of SCUBA-selected galaxies are investigated within the framework of a unifying scheme relating the formation of QSOs and spheroids. The theoretical angular correlation function is derived for different bias…

Astrophysics · Physics 2007-05-23 M. Magliocchetti , L. Moscardini , G. de Zotti , G. L. Granato , L. Danese

We investigate binary mergers of galaxy clusters, the formation of shocks, and the resulting radio relics using three-dimensional simulations. The initial setup consists of two idealized spherical subclusters with a mass ratio below three,…

High Energy Astrophysical Phenomena · Physics 2026-05-27 Hyesung Kang , Dongsu Ryu , Jeongbhin Seo