Results 61 to 70 of about 5,855,247 (377)

A Comprehensive Perturbative Formalism for Phase Mixing in Perturbed Disks. II. Phase Spirals in an Inhomogeneous Disk Galaxy with a Nonresponsive Dark Matter Halo

The Astrophysical Journal, 2023
We develop a linear perturbative formalism to compute the response of an inhomogeneous stellar disk embedded in a nonresponsive dark matter (DM) halo to various perturbations like bars, spiral arms, and encounters with satellite galaxies.
Uddipan Banik, Frank C. van den Bosch, Martin D. Weinberg   +2 more
doaj   +1 more source

The Radio Emission of Interacting Galaxies [PDF]

Symposium - International Astronomical Union, 1982
Gravitational interaction is a straightforward interpretation of some of the peculiar optical morphologies shown by galaxies. There have also been attempts to study the effects of a gravitational interaction on the radio continuum emission. Statistically, the central radio sources (inner 1 kpc) in interacting spiral galaxies are about three times ...
J. M. van der Hulst, E. Hummel, C. G. Kotanyi, J. H. van Gorkom   +3 more
openaire   +2 more sources

Forming Young Bulges within Existing Disks: Statistical Evidence for External Drivers

, 2003
Contrary to traditional models of galaxy formation, recent observations suggest that some bulges form within preexisting disk galaxies. Such late-epoch bulge formation within disks seems to be linked to disk gas inflow and central star formation, caused ...
Abraham R. G., Andredakis Y. C., Becker R. H., Elizabeth J. Barton, Ellis R. S., Friedli D., Kauffmann G., Rolf A. Jansen, Schwarzkopf U., Sheila J. Kannappan, Shioya Y., Tully R. B.   +11 more
core   +1 more source

Hidden Interaction in SBO galaxies [PDF]

International Astronomical Union Colloquium, 1990
Galaxies, like plants, show a large variety of grafts: an individual of some type connects physically with a neighborhood of same or different type. The effects of these interactions between galaxies have a broad range of morphologies depending, among other quantities, on the distance of the closest approach between systems and the relative size of the
GALLETTA, GIUSEPPE, BETTONI, DANIELA, OOSTERLOO T., FASANO G.   +3 more
openaire   +3 more sources

Dark matter and generation of galactic magnetic fields [PDF]

, 2013
A new scenario for creation of galactic magnetic fields is proposed which is operative at the cosmological epoch of the galaxy formation, and which relies on unconventional properties of dark matter. Namely, it requires existence of feeble but long range
Berezhiani, Zurab, Dolgov, A. D., Tkachev, I. I.   +2 more
core   +2 more sources

Galaxy And Mass Assembly (GAMA): the effect of close interactions on star formation in galaxies [PDF]

, 2015
The modification of star formation (SF) in galaxy interactions is a complex process, with SF observed to be both enhanced in major mergers and suppressed in minor pair interactions.
L. Davies, A. Robotham, S. Driver, S. Driver, M. Alpaslan, I. Baldry, J. Bland-Hawthorn, S. Brough, Michael J. I. Brown, M. Cluver, M. Drinkwater, C. Foster, M. Grootes, I. Konstantopoulos, M. Lara-López, Á. López-Sánchez, Á. López-Sánchez, J. Loveday, M. Meyer, A. Moffett, P. Norberg, M. Owers, M. Owers, C. Popescu, C. Popescu, R. Propris, R. Sharp, R. Tuffs, Lijun Wang, Lijun Wang, S. Wilkins, L. Dunne, L. Dunne, N. Bourne, Matthew W. L. Smith   +34 more
semanticscholar   +1 more source

The Subtle Effects of Mergers on Star Formation in Nearby Galaxies

The Astrophysical Journal, 2023
Interactions and mergers play an important role in regulating the physical properties of galaxies, such as their morphology, gas content, and star formation rate (SFR).
Yang A. Li, Luis C. Ho, Jinyi Shangguan
doaj   +1 more source

THE IMPACT OF GALAXY INTERACTIONS ON ACTIVE GALACTIC NUCLEUS ACTIVITY IN zCOSMOS [PDF]

, 2011
Close encounters between galaxies are expected to be a viable mechanism, as predicted by numerical simulations, by which accretion onto supermassive black holes can be initiated.
J. Silverman, J. Silverman, P. Kampczyk, K. Jahnke, Rene Andrae, S. Lilly, M. Elvis, F. Civano, V. Mainieri, C. Vignali, G. Zamorani, P. Nair, O. Fèvre, L. Ravel, S. Bardelli, A. Bongiorno, M. Bolzonella, A. Cappi, K. Caputi, C. Carollo, T. Contini, G. Coppa, O. Cucciati, S. D. Torre, P. Franzetti, B. Garilli, C. Halliday, G. Hasinger, A. Iovino, C. Knobel, A. Koekemoer, K. Kovač, F. Lamareille, J. L. Borgne, V. Brun, C. Maier, M. Mignoli, R. Pelló, E. Pérez-Montero, E. Ricciardelli, Y. Peng, M. Scodeggio, Masayuki Tanaka, L. Tasca, L. Tresse, D. Vergani, E. Zucca, M. Brusa, N. Cappelluti, A. Comastri, A. Finoguenov, Hai Fu, R. Gilli, H. Hao, L. C. Ho, M. Salvato   +55 more
semanticscholar   +1 more source

The Effect of Galaxy Interactions on Starbursts in Milky Way-mass Galaxies in FIRE Simulations

The Astrophysical Journal
Simulations and observations suggest that galaxy interactions may enhance the star formation rate (SFR) in merging galaxies. One proposed mechanism is the torque exerted on the gas and stars in the larger galaxy by the smaller galaxy.
Fei Li, Mubdi Rahman, Norman Murray, Dušan Kereš, Andrew Wetzel, Claude-André Faucher-Giguère, Philip F. Hopkins, Jorge Moreno   +7 more
doaj   +1 more source

Gasdynamics and Starbursts in Interacting Galaxies [PDF]

Symposium - International Astronomical Union, 1999
The onset of gaseous inflows and central activity in interacting galaxies is driven largely by induced bars in the host galaxies. The stability of galaxies against growing bar modes is a direct function of their structural properties — galaxies with central bulges or low disk surface densities are more stable against central starbursts than are ...
openaire   +4 more sources