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Dust properties and distribution in dwarf galaxies
U. Lisenfeld, M. Relano, J. Vilchez +2
We present a study of the extinction, traced by the Balmer decrement, in HII regions in the dwarf galaxies NGC 1569 and NGC 4214. We find that the large-scale extinction around the…
GH FaS : Galaxy H-alpha Fabry-Perot System for the WHT
O. Hernandez, K. Fathi, C. Carignan +11
GHFaS a new Fabry-Perot system, is now available at the William Herschel Telescope. It was mounted, for the first time, at the Nasmyth focus of the 4.2 meter WHT on La Palma in…
Spiral inflow feeding the nuclear starburst in M83, observed in H-alpha emission with the GHAFAS Fabry-Perot interferometer
Kambiz Fathi, John E. Beckman, Andreas A. Lundgren +8
We present observations of the nearby barred starburst galaxy, M83 (NGC5236), with the new Fabry-Perot interferometer GHAFAS mounted on the 4.2 meter William Herschel Telescope on…
On the metallicity dependence of the 24micron luminosity as a star formation tracer
M. Relano, U. Lisenfeld, P. G. Perez-Gonzalez +2
We investigate the use of the rest-frame 24microns luminosity as an indicator of the star formation rate (SFR) in galaxies with different metallicities by comparing it to the (exti…
An Evolutionary Sequence of Expanding Hydrogen Shells in Galaxy Discs
M. Relano, J. E. Beckman, O. Daigle +1
Large HI shells, with diameters of hundreds of pc and expansion velocities of 10-20kms-1 are well observed features of local gas rich galaxies. These shells could well be predicted…
Evolution of Structure in Late-type Spiral Galaxies I: Ionized Gas Kinematics in NGC 628
Kambiz Fathi, John E. Beckman, Almudena Zurita +5
We study two dimensional Fabry-Perot interferometric observations of the nearby face-on late-type spiral galaxy, NGC 628, in order to analyse the ionized gas component of the inter…
Structure and evolution of star-forming gas in late-type spiral galaxies
Kambiz Fathi, John E. Beckman, Almudena Zurita +7
We study two dimensional Fabry-Perot interferometric observations of the nearby face-on late-type spiral galaxy, NGC 628. We investigate the role of the individual HII regions toge…
Distribution of extinction and star formation in NGC1569
M. Relano, U. Lisenfeld, E. Battaner +2
We investigate the distribution of the intrinsic extinction in NGC1569 using an extinction map derived from the H_alpha/H_beta emission line ratio. We compare the extinction distri…
Distribution of the Extinction and Star Formation in NGC 1569
M. Relano, U. Lisenfeld, J. M. Vilchez +1
We investigate spatial the distribution of the intrinsic extinction in the starburst dwarf galaxy NGC1569 creating an extinction map of the whole galaxy derived from the Halpha/Hbe…
The internal dynamical equilibrium of HII regions: a statistical study
M. Relano, J. E. Beckman, A. Zurita +2
We present an analysis of the integrated Halpha emission line profiles for the HII region population of the spiral galaxies NGC 1530, NGC 6951 and NGC 3359. We show that 70% of the…
Expansive components in H II regions
M. Relano, J. E. Beckman
We study the presence of low intensity high velocity components, which we have termed wing features in the integrated Halpha emission line profiles of the HII region populations of…
Gas flows, star formation and galaxy evolution
John E. Beckman, Emilio Casuso, Almudena Zurita +1
In the first part of this article we show how observations of the chemical evolution of the Galaxy: G- and K-dwarf numbers as functions of metallicity, and abundances of the light…
Propagation of ionizing radiation in HII regions: the effects of optically thick density fluctuations
C. Giammanco, J. E. Beckman, A. Zurita +1
The accepted explanation of the observed dichotomy of two orders of magnitude between in situ measurements of electron density in HII regions, derived from emission line ratios, an…
Ionized gas kinematics and massive star formation in NGC 1530
A. Zurita, M. Relano, J. E. Beckman +1
We present emission line mapping of the strongly barred galaxy NGC 1530 obtained from Fabry-Perot interferometry in Halpha, at significantly enhanced angular resolution compared wi…
Photoionization Models of NGC 346
M. Relano, M. Peimbert, J. E. Beckman
We present spherically symmetric and plane parallel photoionization models of NGC 346, an HII region in the Small Magellanic Cloud. The models are based on CLOUDY and on the observ…