Results 111 to 120 of about 451,169 (273)

The SWELLS survey - V. A Salpeter stellar initial mass function in the bulges of massive spiral galaxies [PDF]

, 2012
Recent work has suggested that the stellar initial mass function (IMF) is not universal, but rather is correlated with galaxy stellar mass, stellar velocity dispersion or morphological type.
A. Dutton, A. Dutton, T. Treu, B. Brewer, B. Brewer, P. J. Marshall, M. Auger, M. Auger, M. Barnabè, D. Koo, A. Bolton, L. Koopmans   +11 more
semanticscholar   +1 more source

Scheffrahnitermes ubuntu (Isoptera: Apicotermitinae), Description of a New Termite Using a Collaborative Approach to Address the Wallacean Shortfall

New Zealand Journal of Zoology, Volume 53, Issue 2, June 2026.
The study of Neotropical Apicotermitinae remains challenging due to the large number of undescribed taxa (Linnean shortfall) as well as the scarcity of distributional data (Wallacean shortfall). Despite recent efforts to reduce the first one, the second remains an even more significant challenge.
Camila C. Mellado, Giordano G. Messina, Antonio Carvalho, Danilo E. Oliveira, Rayssa Almeida‐Azevedo, Renato Almeida de Azevedo, Hélida F. Cunha, Emanuelly F. Lucena, Joice P. Constantini, Olga P. Pinzón‐Florián, Tiago F. Carrijo   +10 more
wiley   +1 more source

A simple model of spiral galaxies from geometric optics

AIP Advances
We propose a simple model of spiral galaxies based on the interference of gravitational waves. The interference is deduced from geometric optics analysis of the refractive index profiles that mimic the behavior of gravitational potentials −1/r and r2. We
Bogdan Szafraniec, James N. Blake
doaj   +1 more source

Radial Metallicity Distribution Breaks at Corotation Radius in Spiral Galaxies [PDF]

, 2012
We analyzed the relation between the corotation radii and the galactic radii at which breaks or changes of slope of the metallicity gradients occur in spiral galaxies.
S. Scarano, J. L'epine
semanticscholar   +1 more source

FORMATION AND MAINTENANCE OF SPIRAL STRUCTURE IN GALAXIES [PDF]

Symposium - International Astronomical Union, 1985
The formation and maintenance of spiral structure in galaxies is discussed in terms of spiral modes with a general perception consistent with the hypothesis of quasi-stationary spiral structure. The latter is explained in some detail to give it the original proper perspective and to contrast it with recent studies of non-stationary spiral structures ...
C. C. Lin, G. Bertin
openaire   +1 more source

On the Detection of Low‐Frequency Planetary Radio Emission With an Orbiting Interferometer

Radio Science, Volume 61, Issue 6, June 2026.
Abstract The magnetized planets of the outer Solar System produce kilometric radio emissions at very low frequencies (<1 ${< } 1\,$MHz). They reveal the planetary magnetic dynamics and their interaction with the solar wind. Those radio emissions can also serve as a proxy for interplanetary space weather monitoring.
E. Rouillé, B. Cecconi, B. Segret, J. N. Girard, A. Loh   +4 more
wiley   +1 more source

H i Gas and Star Formation in Major Galaxy Pairs from the FAST All Sky H i Survey (FASHI)

The Astrophysical Journal
Atomic hydrogen (H i ) plays a fundamental role in fueling star formation in galaxies. However, the behavior of H i gas in interacting systems, particularly galaxy pairs, remains elusive.
Shulan Yan, Qingzheng Yu, Taotao Fang, Chuan He, Andrew Ma, Junfeng Wang, C.Kevin Xu, Ming Zhu, Weishan Zhu   +8 more
doaj   +1 more source

The Study of Nebular Emission on Nearby Spiral Galaxies in the IFU Era

Advances in Astronomy, 2013
A new generation of wide-field emission-line surveys based on integral field units (IFU) is allowing us to obtain spatially resolved information of the gas-phase emission in nearby late-type galaxies, based on large samples of HII regions and full two ...
Fernando Fabián Rosales-Ortega
doaj   +1 more source

The influence of the cluster environment on the star formation efficiency of 12 Virgo spiral galaxies [PDF]

, 2012
The influence of the environment on gas surface density and star formation efficiency of cluster spiral galaxies is investigated. We extend previous work on radial profiles by a pixel-to pixel analysis looking for asymmetries due to environmental ...
B. Wong, J. Braine, A. Chung, J. Cds, O. Strasbourg, France., Csiro Astronomy, S. Science, Epping, Australia., U. Bordeaux, L. Bordeaux, D. O. Astronomy, Yonsei University Observatory, R. Korea., Y. A. Department, New Haven, Usa   +17 more
semanticscholar   +1 more source

Rotation Curves of 967 Spiral Galaxies [PDF]

The Astrophysical Journal Supplement Series, 1995
We present the rotation curves (RCs) of 967 spiral galaxies, obtained by folding and deprojecting the raw optical data by Mathewson et al. (1992). Out of these, we have identified 80 excellent RCs and 820 fair RCs. The 80 excellent RCs are smooth, symmetric, have negligible rms internal error, extend to at least the optical radius, and have high and ...
Persic, M., Salucci, P.
openaire   +3 more sources