Results 41 to 50 of about 976,493 (346)

Star formation rates and the kinematics of gas in the spiral arms of NGC 628

, 2015
Relations between star formation rates along the spiral arms and the velocities of gas inflow into the arms in grand-design galaxy NGC 628 were studied.
Efremov, Yury N., Gusev, Alexander S., Sakhibov, Firouz   +2 more
core   +1 more source

The Presolar Heritage of 50Ti and 26Al Heterogeneity in the Protoplanetary Disk

The Astrophysical Journal
Nucleosynthetic isotope anomalies have been documented within the solar protoplanetary disk for several isotopes, including ^48 Ca, ^50 Ti, ^54 Cr, ^94 Mo, and ^96 Zr.
Kirsten K. Larsen, Troels Haugbølle, James N. Connelly, Elishevah van Kooten, Martin Bizzarro, Martin Schiller   +5 more
doaj   +1 more source

Radio Triggered Star Formation in Cooling Flows

, 1999
The giant galaxies located at the centers of cluster cooling flows are frequently sites of vigorous star formation. In some instances, star formation appears to have been triggered by the galaxy's radio source.
Allen, Allen, Allen, B.R. McNamara, Baum, Begelman, Burns, Cardiel, Crawford, Daly, De Young, di Serego Alighieri, Fabian, Heckman, Jannuzi, Johnstone, Koekemoer, McCarthy, McNamara, McNamara, McNamara, McNamara, McNamara, McNamara, Murphy, Pinkney, Porter, Sarazin, Sarazin, Schombert, Shields, Uson, van Breugel, van Breugel, Voit   +34 more
core   +2 more sources

Massive star and star cluster formation [PDF]

Proceedings of the International Astronomical Union, 2006
AbstractI review the status of massive star formation theories: accretion from collapsing, massive, turbulent cores; competitive accretion; and stellar collisions. I conclude the observational and theoretical evidence favors the first of these models.
openaire   +4 more sources

The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada

Population Ecology, EarlyView.
We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley   +1 more source

Physical Processes in Star Formation [PDF]

Space Science Reviews, 2020
Star formation is a complex multi-scale phenomenon that is of significant importance for astrophysics in general. Stars and star formation are key pillars in observational astronomy from local star forming regions in the Milky Way up to high-redshift galaxies.
Martin Krause, Alexei G. Kritsuk, Marco Padovani, Simon C. O. Glover, Stella S. R. Offner, J. M. Diederik Kruijssen, Philipp Girichidis, Patrick Hennebelle, Patrick Hennebelle, Ralf S. Klessen   +9 more
openaire   +6 more sources

Network topology drives population temporal variability in experimental habitat networks

Population Ecology, EarlyView.
Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu, J. Angus Webb, William D. Bovill, Elise L. King   +3 more
wiley   +1 more source

Redox evolutions of planetary mantle reservoirs constrained by titanium isotopes

Communications Earth & Environment
The oxygen fugacity (hereafter referred as fO2) of terrestrial planets is key in defining the outcome of planetary-scale differentiation and the planets’ potential habitability.
Zhengbin Deng, Katrine Nikolajsen, Martin Schiller, Lu Pan, Wenzhong Wang, Martin Bizzarro   +5 more
doaj   +1 more source

The specific star formation rate of high redshift galaxies: the case for two modes of star formation

, 2010
We study the specific star formation rate (SSFR) and its evolution at $z\gtsim 4$, in models of galaxy formation, where the star formation is driven by cold accretion flows.
Antonuccio-Delogu, Benson, Binney, Birnboim, Booth, Bouche, Boylan-Kolchin, Cattaneo, Conselice, Croton, Daddi, Daddi, Dekel, Dekel, Dekel, Dutton, Genel, Genzel, González, Hopkins, Jiang, Jogee, Joseph Silk, Kang, Kang, Kauffmann, Kennicutt, Kereš, Kereš, Khochfar, Khochfar, Khochfar, Khochfar, Khochfar, King, Lacey, Maio, Mo, Neistein, Neistein, Ocvirk, Oppenheimer, Peirani, Pérez-González, Rees, Sadegh Khochfar, Schaerer, Schaye, Silk, Silk, Silk, Springel, Stark, Tacconi, Yabe   +54 more
core   +1 more source

Geographic variation in walking activity in the red flour beetle Tribolium castaneum

Population Ecology, EarlyView.
This study examined whether there is geographic variation in field populations, focusing on the moving activity in the red flour beetle Tribolium castaneum. Results showed significant differences in moving activity among field populations but no correlation with latitude or meteorological factors.
Kentarou Matsumura
wiley   +1 more source