نتایج جستجو برای: starburst galaxies
تعداد نتایج: 47427 فیلتر نتایج به سال:
The oxygen (O/H) and N/O abundance ratios along the bar of 16 barred spiral starburst galaxies are determined using long–slit spectroscopy. The abundance gradients and the spatial distribution of the ionized gas along the bar are used to understand the role of bars in starburst galaxies. The oxygen abundance gradients are steeper than in normal barred galaxies, with a mean of –0.15 dex/kpc, whi...
We present the first large-scale study of E+A galaxies that incorporates photometry in the ultraviolet (UV ) wavelengths. E+A galaxies are ‘post-starburst’ systems, with strong Balmer absorption lines indicating significant recent star formation, but without [OII] and Hα emission lines which are characteristic of ongoing star formation. The starburst that creates the E+A galaxy typically takes ...
We present high-resolution optical HST Space Telescope Imaging Spectrograph (STIS) observations made with two slits crossing four of the optically brightest starburst clumps in the vicinity of the nucleus of M82. These provide Hα kinematics, extinction, electron density and emission measures. From the radial velocity curves derived from both slits we confirm the presence of a stellar bar. We al...
Aims. It is still not understood why star-forming galaxies deviate from the ultraviolet colour-attenuation relation of starburst galaxies. Previous work and models hint that the role of the shape of the attenuation curve and the age of stellar populations play an important role. In this paper we aim at understanding the fundamental reasons for this deviation. Methods. We have used the CIGALE sp...
We present submillimeter SCUBA images of the nearby, starburst galaxies NGC 253, NGC 4631 and M82 (primarily at wavelengths of 450 and 850 μm). The edge-on orientation of our targets, in conjunction with the resolution of the instrument (15′′ FWHM at 850 μm), allows us to probe the optically-obscured centre and resolve the minor-axis superwind from the main disk. For NGC 253 and M82, we detect ...
Although starburst galaxies have relatively flat spectral energy distributions, their strong optical emission lines and near-UV continua make it very feasible to estimate their redshifts photometrically. In this work, I describe a photometric technique that simultaneously (1) identifies galaxies by star formation rate and (2) measures their redshifts with an accuracy of σz = 0.05 for objects at...
The issue of a starburst-AGN connection in local and distant galaxies is relevant for understanding galaxy formation and evolution, the star formation and metal enrichment history of the universe, the origin of the extragalactic background at low and high energies, and the origin of nuclear activity in galaxies. Here I review some of the observational evidence recently brought forward in favor ...
This review covers age-dating methods applied to young stellar populations in starburst galaxies with ages of 10 yr and less. First, recent advances in stellar modeling, both for the interior and the atmospheres, are discussed and spectral lines and colors suitable for age-dating are identified. These age indicators are then applied to single stellar populations, the simplest building blocks of...
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