Results 101 to 110 of about 1,782 (230)

The Inner Regions of Disk Galaxies: A Constant Baryonic Fraction?

open access: yesGalaxies, 2014
For disk galaxies (spirals and irregulars), the inner circular-velocity gradient dRV0 (inner steepness of the rotation curve) correlates with the central surface brightness ∑*,0 with a slope of ~0.5.
Federico Lelli
doaj   +1 more source

Spectroscopic Studies of Starburst Galaxies; the Dynamical Structure of Blue Compact Dwarf Galaxy Haro 6 [PDF]

open access: yesJournal of Astronomy and Space Sciences, 1995
We carried out photometric and spectroscopic observations of the blue compact dwarf galaxy Haro 6 in the Virgo Cluster of Galaxies. The long-slit spectroscopy was employed at three position angles, ϕ = 0°, ϕ = 30°, and ϕ = 120° CCD camera mounted on the ...
Mun-Suk Chun   +2 more
doaj  

Stellar dynamics around transient co-rotating spiral arms

open access: yesEPJ Web of Conferences, 2012
Spiral density wave theory attempts to describe the spiral pattern in spiral galaxies in terms of a long-lived wave structure with a constant pattern speed in order to avoid the winding dilemma.
Cropper M., Grand R.J.J., Kawata D.
doaj   +1 more source

Reanalysis of the MACHO Constraints on PBH in the Light of Gaia DR3 Data

open access: yesUniverse
The recent astrometric data of hundreds of millions of stars from Gaia DR3 has allowed for a precise determination of the Milky Way rotation curve up to 28 kpc. The data suggest a rapid decline in the density of dark matter beyond 19 kpc.
Juan García-Bellido, Michael Hawkins
doaj   +1 more source

An Equilibrium Model of the Galaxy Determined by Element Abundance Gradients

open access: yesThe Astrophysical Journal
We present a method to determine the gravitational potential of the Milky Way from measurements of the locations, velocities, and element abundances of stars in the Galactic disk.
Lawrence M. Widrow   +4 more
doaj   +1 more source

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