Results 81 to 90 of about 1,810 (211)

Physical Parameters of Late Type Spiral Galaxies I-Mass and Luminosity of NGC 6946 [PDF]

open access: yesJournal of Astronomy and Space Sciences, 1985
Using Brandt model the mass distribution of the late type spiral galaxy NGC 6946 was derived, and the total mass was reestimated to understand the M/L ratio of this galaxy. Two kinds of the rotation curve with shape parameter n = 1 and 3.3 were examined.
Sug-Whan Kim, Mun-Suk Chun
doaj  

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  

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

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

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

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

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