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We use high-resolution MHD simulations of isolated disk galaxies to investigate the co-evolution of magnetic fields with a self-regulated, star-forming interstellar medium (ISM). The simulations are conducted using the Ramses AMR code on…

星系天体物理 · 物理学 2024-06-05 Hector Robinson , James Wadsley

We investigate how a protoplanetary disc's susceptibility to gravitational instabilities and fragmentation depends on the mass of its host star. We use 1D disc models in conjunction with 3D SPH simulations to determine the critical…

地球与行星天体物理 · 物理学 2020-01-29 James Cadman , Ken Rice , Cassandra Hall , Thomas J. Haworth , Beth Biller

We study the properties of kinematically disturbed galaxies in the SAMI Galaxy Survey using a quantitative criterion, based on kinemetry (Krajnovic et al.). The approach, similar to the application of kinemetry by Shapiro et al. uses…

We estimate the masses of disks of galaxies using the marginal gravitational stability criterion and compare them with the photometrical disk mass evaluations. The comparison reveals that the stellar disks of most of spiral galaxies we…

宇宙学与河外天体物理 · 物理学 2015-06-12 A. Saburova , A. Zasov

Self-regulation of star formation in disks is controlled by two dimensionless parameters: the Toomre parameter for gravitational instability and the porosity of the interstellar medium to supernova remnant-heated gas. An interplay between…

天体物理学 · 物理学 2010-11-23 Joseph Silk

Gravitational instabilities play a primary role in shaping the clumpy structure and powering the star formation activity of gas-rich high-redshift galaxies. Here we analyse the stability of such systems, focusing on the size and mass ranges…

星系天体物理 · 物理学 2015-06-19 Alessandro B. Romeo , Oscar Agertz

An analysis is presented of a numerical investigation of the dynamics and geometry of accretion discs in binary systems with mass ratios q < 0.1, applicable to ultra-compact X-ray binaries, AM CVn stars and very short period cataclysmic…

天体物理学 · 物理学 2008-11-26 Michael Truss

We determined the chemical and kinematic properties of the Galactic thin and thick disk using a sample of 307,246 A/F/G/K-type giant stars from the LAMOST spectroscopic survey and Gaia DR2 survey. Our study found that the thick disk…

星系天体物理 · 物理学 2019-07-31 Yepeng Yan , Cuihua Du , Shuai Liu , Hefan Li , Jianrong Shi , Yuqin Chen , Jun Ma , Zhenyu Wu

[Abridged] Star and planet formation are the complex outcomes of gravitational collapse and angular momentum transport mediated by protostellar and protoplanetary disks. In this review we focus on the role of gravitational instability in…

太阳与恒星天体物理 · 物理学 2016-10-05 Kaitlin M. Kratter , Giuseppe Lodato

High-angular resolution observations at sub-millimeter/millimeter wavelengths of disks surrounding young stars have shown that their morphology is made of azimuthally-symmetric or point-symmetric substructures, in some cases with spiral…

地球与行星天体物理 · 物理学 2021-10-27 Diana Blanco , Luca Ricci , Mario Flock , Neal Turner

We study particle dynamics in local two-dimensional simulations of self-gravitating accretion discs with a simple cooling law. It is well known that the structure which arises in the gaseous component of the disc due to a gravitational…

地球与行星天体物理 · 物理学 2015-06-05 P. G. Gibbons , W. K. M. Rice , G. R. Mamatsashvili

We investigate the correlations among stellar mass (M_*), disk scale length (R_d), and rotation velocity at 2.2 disk scale lengths (V_2.2) for a sample of 81 disk-dominated galaxies (disk/total >= 0.9) selected from the SDSS. We measure…

The surface densities of star formation, Sigma_SFR, in 24 dwarf irregular (dIrr) galaxies from the LITTLE THINGS survey are combined with gas surface densities and midplane pressures to examine the correlations found previously for spiral…

星系天体物理 · 物理学 2025-12-12 Bruce G. Elmegreen , Deidre A. Hunter , Edvige Corbelli

We present the first comparison of the dynamical properties of different samples of z~1.4-3.4 star forming galaxies from spatially resolved imaging spectroscopy from SINFONI/VLT integral field spectroscopy and IRAM CO millimeter…

(abridged) We have analyzed the properties of the rest-frame optical emission lines of a sample of 53 intensely star forming galaxies at z=1.3 to 2.7 observed with SINFONI on the ESO-VLT. We find large velocity dispersions in the lines,…

宇宙学与河外天体物理 · 物理学 2015-06-15 M. D. Lehnert , L. Le Tiran , N. P. H. Nesvadba , W. van Driel , F. Boulanger , P. Di Matteo

We estimate the parameters of the Kennicutt-Schmidt (KS) relationship, linking the star formation rate (Sigma_SFR) to the molecular gas surface density (Sigma_mol), in the STING sample of nearby disk galaxies using a hierarchical Bayesian…

宇宙学与河外天体物理 · 物理学 2015-06-16 Rahul Shetty , Brandon C. Kelly , Nurur Rahman , Frank Bigiel , Alberto D. Bolatto , Paul C. Clark , Ralf S. Klessen , Lukas K. Konstandin

In this review I concentrate on three areas related to structure of disks in spiral galaxies. First I will review the work on structure, kinematics and dynamics of stellar disks. Next I will review the progress in the area of flaring of HI…

星系天体物理 · 物理学 2015-05-18 P. C. van der Kruit

We present an analysis of the gas dynamics of star-forming galaxies at z~1.5 using data from the KMOS Galaxy Evolution Survey (KGES). We quantify the morphology of the galaxies using $HST$ CANDELS imaging parametrically and…

We include feedback in global hydrodynamic simulations in order to study the star formation properties, and gas structure and dynamics, in models of galactic disks. We extend previous models by implementing feedback in gravitationally bound…

天体物理学 · 物理学 2009-11-13 Rahul Shetty , Eve C. Ostriker
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