Results 51 to 60 of about 281 (182)

Feedback shaped the galaxy morphological sequence in presence of mergers

The Open Journal of Astrophysics
Bulges and disks are major structural components that define galaxy morphology. The mass ratios of bulges and disks increase statistically with the galaxy mass, with the high-mass end occupied by elliptical galaxies. Although previous theoretical studies
Masafumi Noguchi
doaj   +1 more source

To multicellularity and back again: Description of two new coccoid genera (Portococcus gen. nov. and Pseudanabaenococcus gen. nov.) in the basal “filamentous” order Pseudanabaenales, Cyanobacteria

Journal of Phycology, Volume 62, Issue 1, Page 234-255, February 2026.
Abstract Despite recent efforts in taxonomic revision of phylogenetically basal photosynthetic cyanobacteria, cryptic diversity and recurrence of simple plesiomorphic morphotypes has continued to appear in phylogenies with poorly characterized “Synechococcus” and “Pseudanabaena” strains.
Otakar Strunecký, Eliška Kozlíková‐Zapomělová, Jitka Jezberová, João Morais, María Alicia Toledo Lemus, Lenka Štenclová, Jeffrey R. Johansen, Kateřina Čapková, Vitor M. O. Vasconcelos, Jan Mareš   +9 more
wiley   +1 more source

Rotation Curves of Galaxies: A New Theoretical Approach and Comparison With Observations

Advances in Astronomy, Volume 2026, Issue 1, 2026.
Observational results on the rotation curve of a rotating galaxy are used in thought experiments. A binary system is inserted in the galaxy, and equations for radial accelerations of the two bodies are found. Similarly, a single body is inserted in a multicomponent galaxy, and an equation for radial acceleration of the body is discussed.
J. Klačka, Sándor Frey
wiley   +1 more source

Bulges on the Fundamental Plane of early-type galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
In an ongoing effort to study the formation and evolution of galactic bulges we have investigated the position of 19 bulges of type S0-Sbc on the fundamental plane (FP). We find that bulges, both in B and K band, lie close to but slightly below the FP defined by ellipticals and S0s, i.e. are slightly brighter.
Falcón-Barroso, Jesús, Peletier, Reynier F., Balcells, Marc   +2 more
openaire   +2 more sources

Astragalus zhobensis, a new species of section Caprini (Fabaceae) from Zhob, northern Balochistan, Pakistan

Nordic Journal of Botany, Volume 2025, Issue 12, December 2025.
A new species Astragalus zhobensis, from Qamardin Karez, Zhob district, northern Balochistan, Pakistan is described and illustrated. The new species is morphologically similar to A. cartilagineus, but can be distinguished by strigose hairs 3–5 mm long, (not stiff 1.5−4.0 mm long hairs); stipules 5–15 mm (not 8−12 mm) long; leaflets in 4–6 pairs, (not 3–
Tahir Khan, Nazar Khan, Amjad Khan, Amir Sultan, Kamran Ishaq   +4 more
wiley   +1 more source

Landslide preparation by forestry activity in a region of high erosion rates: Waingake Landslide, northeast New Zealand

New Zealand Journal of Geology and Geophysics, Volume 68, Issue 5, Page 1015-1030, December 2025.
ABSTRACT Northeastern New Zealand’s sedimentary rocks and soils are particularly vulnerable to landsliding, with some of the highest specific sediment yields, globally. In addition to earthquakes, rainfall is considered an important landslide triggering process.
Jivyde Despojo, Martin S. Brook, David Alama, Matthew E. Cook, Murry Cave   +4 more
wiley   +1 more source

Grand Design versus Multiarmed Spiral Galaxies: Dependence on Galaxy Structure

The Astronomical Journal
We developed an algorithm to use Galaxy Zoo 3D spiral arm masks produced by citizen scientist volunteers to semiautomatically classify spiral galaxies as either multiarmed or grand design spirals. Our final sample consists of 299 multiarmed and 245 grand
Beverly J. Smith, Matthew Watson, Mark L. Giroux, Curtis Struck   +3 more
doaj   +1 more source

Understanding the Fundamental Plane and the Tully Fisher Relation

Frontiers in Astronomy and Space Sciences, 2020
The relation between early type galaxy size, surface brightness and velocity dispersion, “the fundamental plane,” has long been understood as resulting from equilibrium in their largely pressure supported stellar dynamics.
Jeremy Mould
doaj   +1 more source

Bayesian bulge–disc decomposition of galaxy images [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
We introduce PHI, a fully Bayesian Markov-chain Monte Carlo algorithm designed for the structural decomposition of galaxy images. PHI uses a triple layer approach to effectively and efficiently explore the complex parameter space. Combining this with the use of priors to prevent nonphysical models, PHI offers a number of significant advantages for ...
Argyle, JJ, Mendez-Abreu, J, Wild, V, Mortlock, DJ   +3 more
openaire   +4 more sources

A new genus of jumping spiders (Araneae: Salticidae) inhabiting the South Island New Zealand rocky alpine zone

New Zealand Journal of Zoology, Volume 52, Issue 5, Page 716-795, December 2025.
ABSTRACT The spider family Salticidae (jumping spiders) is among the most heavily researched groups of invertebrates globally. Nevertheless, in Aotearoa New Zealand most species have never been studied. While it is estimated that approximately 200 endemic salticid species are found across the country, only around 50 have been described and fewer than ...
Robin G. Long, Cor J. Vink, Adrian M. Paterson   +2 more
wiley   +1 more source