Results 91 to 100 of about 8,619 (182)
Spiral structure in external galaxies [PDF]
Symposium - International Astronomical Union, 1970 The need for observing at least four different categories of optical objects for a satisfactory definition of optical spiral structure is emphasized. A sequence of optical form-types for the description of spiral structure is outlined. A pronounced difference in the nature of the spiral structure of the outer and inner parts of Messier 33 is ...
openaire +1 more source
The formation of molecular clouds in spiral galaxies [PDF]
, 2007 Molecular clouds are imperative to astronomy as the sites of all known star formation. The problem of how molecular clouds are formed in spiral galaxies is approached numerically, by modelling the response of a gas disk to a spiral potential.
Dobbs, Clare L.
core
Magnetic fields in spiral galaxies [PDF]
The Astronomy and Astrophysics Review, 1990 Radio synchrotron emission is a powerful tool to study the strength and structure of magnetic fields in galaxies. Unpolarized synchrotron emission traces isotropic turbulent fields which are strongest in spiral arms and bars (20-30 μG) and in central starburst regions (50-100 μG).
openaire +5 more sources
The relationship between Gas and Galaxies [PDF]
, 2009 We have investigated the 2D 2-point correlation function, ƐAG, between low column density Lya absorbers and galaxies at a redshift z ~ 1 for the first time.
Shone, Allen Maurice
core
A Model of a Spiral Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 1951 McVittie, G. C. +1 more
openaire +2 more sources
The star formation history of early-type galaxies in the fornax cluster [PDF]
, 1998 We have measured central line strengths and line-strength gradients for a complete sample of early-type galaxies in the Fornax cluster, comprising 11 elliptical and 11 lenticular galaxies, more luminous than M(_B) = -17.
Kuntschner, Harald, Kuntschner, H.
core
SDSS-IV MaNGA: Stellar Population Gradients Within Barred Galaxies [PDF]
, 2019 Bars in galaxies are thought to stimulate both inflow of material and radial mixing along them. Observational evidence for this mixing has been inconclusive so far however, limiting the evaluation of the impact of bars on galaxy evolution.
Knapen, Johan Hendrik +26 more
core +2 more sources
Origin Of Red Sequence Barred Spiral Galaxies [PDF]
, 2022 Spiral galaxies contain spiral arms that are sites of ongoing star formation, typically making these galaxies appear blue in color. Several studies, however, have recently found that a small fraction of cluster spiral galaxies (~10%) appear red in color.
Lesser, Jenica
core +1 more source
Are spiral galaxies heavy smokers? [PDF]
, 1990 The dustiness of spiral galaxies is discussed. Starburst galaxies and the shortage of truly bright spiral galaxies is cited as evidence that spiral galaxies are far dustier than has been thought.
Disney, Michael John +2 more
core
Polarimetric Observations of Spiral Galaxies
Publications of the Astronomical Society of the Pacific, 1967 The extragalactic systems NCC 3031, NCC 4594, NGC 5194, and NGC 5457 have been observed polarimetrically. Linear polarization between 0.1 and 1.0 percent was detected in the spiral arms of all four galaxies. The planes of vibration indicate that reflection as well as interstellar absorption of starlight by the internal dust clouds of the observed ...
openaire +1 more source