Results 31 to 40 of about 390,122 (225)

Global properties of irregular galaxies

The Astrophysical Journal Supplement Series, 1982
We present optical and radio observations of global properties for a sample of noninteracting irregular galaxies and a few comparison objects. Program galaxies were chosen primarily on the basis of their blue colors and thus may be expected to represent systems with high rates of star formation.
D. A. Hunter, J. S. Gallagher, D. Rautenkranz   +2 more
openaire   +1 more source

Concatenated Irregular Variable Length Coding and Irregular Unity Rate Coding [PDF]

, 2009
In this contribution we propose the novel serial concatenation of Irregular Variable Length Coding (IrVLC) and Irregular Unity Rate Coding (IrURC), where we matched the corresponding EXtrinsic Information Transfer (EXIT) functions to each other.
R. G. Maunder, L. Hanzo, Hanzo, L., Maunder, R. G.   +3 more
core   +1 more source

Scalable Computation of Topological Abstractions for Scalar Data

Computer Graphics Forum, EarlyView.
Abstract Topological data analysis has become an important tool for large scale scalar data analysis and visualization, efficiently extracting the inherent structure and features of interest of the data. However, with growing dataset sizes and complexity, it is increasingly becoming infeasible to compute topological abstractions of interest in serial ...
M. Will, J. Lukasczyk, J. Tierny, A. Gyulassy, G. H. Weber, H. Carr, C. Garth   +6 more
wiley   +1 more source

Nitrogen in irregular galaxies

The Astrophysical Journal, 1990
A study of nitrogen in giant H II regions located within low-abundance irregular galaxies is presented. Both observations and theoretical models are used to examine variations in the abundance of nitrogen relative to oxygen in these galaxies. Analysis of these and previously published observations suggests that the use of low spectral resolution is the
openaire   +1 more source

Mapping the dynamics, star-formation rates, and chemical properties of galaxies with integral field spectroscopy [PDF]

, 2005
Major advances in the development of instruments for eight and ten meter class telescopes are revolutionising our understanding of galaxy formation. In particular, Integral Field Spectrographs (which produce a three dimensional {x, y, velocity) map of a ...
Swinbank, Anthony Mark, Swinback, Anthony Mark   +1 more
core  

FEAST: Probing the Stellar Population of the Starburst Dwarf Galaxy NGC 4449 with JWST/NIRCam

The Astrophysical Journal
We present new JWST/NIRCam observations of the starburst irregular galaxy NGC 4449, obtained in Cycle 1 as part of the Feedback in Emerging extrAgalactic Star clusTers program, which we use to investigate its resolved stellar populations and their ...
Matteo Correnti, Giacomo Bortolini, Flavia Dell’Agli, Angela Adamo, Michele Cignoni, Elena Sacchi, Monica Tosi, Alex Pedrini, Anne S. M. Buckner, Daniela Calzetti, Ana Duarte-Cabral, Bruce G. Elmegreen, Helena Faustino Vieira, John S. Gallagher, Kathryn Grasha, Benjamin Gregg, Kelsey E. Johnson, Thomas S.-Y. Lai, Drew Lapeer, Sean T. Linden, Matteo Messa, Goran Ostlin, Elena Sabbi, Linda J. Smith, Paolo Ventura   +24 more
doaj   +1 more source

Chemical composition and kinematics of ionised gas in low-mass star-forming galaxies with extremely high [O III]/[O II] ratios★

Astronomy & Astrophysics
We present Very Large Telescope/Xshooter spectrophotometric observations of eleven low-redshift (z < 0.085) compact star-forming galaxies (the ‘high O32 sample’). These galaxies are characterised by extremely high emission-line ratios, [O III]λ5007/[O II]
Izotov Y. I., Guseva N. G., Schaerer D., Amorín R. O.   +3 more
doaj   +1 more source

A Young Star Cluster in the Leo a Galaxy

Open Astronomy, 2015
We report a serendipitous discovery of a star cluster in the dwarf irregular galaxy Leo A. Young age (~28 Myr) and low mass (~510 M⊙) estimates are based on the isochrone fit assuming a metallicity derived for HII regions (Z = 0.0007).
Stonkutė R., Narbutis D., Bridžius A., Leščinskaitė A., Vansevičius V.   +4 more
doaj   +1 more source

Survey on Visualization of Information Diffusion over Networks

Computer Graphics Forum, EarlyView.
Abstract Information Diffusion (ID) describes how a value (e.g., a pathogen, a rumor, a packet) spreads through an underlying “medium” network of elements (e.g., a social or computer network). Understanding the information diffusion process is essential to predicting trends, controlling misinformation, and enhancing decision‐making as well as ...
T. Baumgartl, M. Sondag, V. Filipov, M. Tuscher, S. Rajendran, S. Miksch, D. Archambault, A. Arleo, T. von Landesberger   +8 more
wiley   +1 more source

Optical polarimetry studies of Seyfert galaxies [PDF]

, 1999
Optical imaging polarimetry has been performed on seven nearby Seyfert galaxies, three with face-on and four with edge-on host galaxies of various morphological classifications.
Felton, Michelle Ann
core