arXiv subjects

Mercedes Mollá

Publications and source records attributed to Mercedes Mollá.

22 records · Page 2Linked to original sources

arXiv2007

Stellar Populations in the Center of the Barred Galaxy NGC 4900

We characterize the stellar populations in the nuclear region of the barred spiral galaxy NGC 4900 using the integral field spectrometer OASIS and the synthesis code LavalSB and the code from Mollá & Garc\'ıa-Vargas (2000) for the young ($< 10$ Myr) and the old stellar populations, respectively. The high spatial resolution of the instrument allows us to find an old population uniformely distributed and younger regions located at the end of the galaxy bar and on each side of a nuclear bar.

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arXiv2007

Evolutionary synthesis models for spirals and irregular galaxies

We show autoconsistent chemical and spectro-photometric evolution models applied to spiral and irregular galaxies. Evolutionary synthesis models usually used to explain the stellar component spectro-photometric data, are combined with chemical evolution models, to determine precisely the evolutionary history of spiral and irregular galaxies. In this piece of work we will show the results obtained for a wide grid of modeled theoretical galaxies

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arXiv2007

The N/O evolution on galaxies:the role played by the star formation history

We study the evolution of nitrogen resulting from a set of spiral and irregular galaxy models computed for a large number of input mass radial distributions and with various star formation efficiencies. We show that our models produce a nitrogen abundance evolution in good agreement with the observational data. In particular, low N/O values for high-redshift objects, such as those obtained for Damped Lyman Alpha galaxies can be obtained with our models simultaneously to higher and constant values of N/O as those observed for irregular and dwarf galaxies, at the same low oxygen abundances $\rm 12+log(O/H) \sim 7$ dex. The differences in the star formation histories of the regions and galaxies modeled are essential to reproduce the observational data in the N/O-O/H plane.

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arXiv2007

The H$_{2}$ density within spiral and irregular galaxies at high redshift: estimating CO detection limits

We have computed a grid of chemical evolution models for a large set of spiral and irregular theoretical galaxies of different total mass. In our models, the gas phase has two components, the diffuse and the molecular one ($\rm H_{2}$). It is possible, therefore, to follow the time (or redshift) evolution of the expected density of the $\rm H_{2}$ phase. We will show the predictions of this gas density at hight redshift, which might be detected with ALMA, in this type of galaxies.

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