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Mapping the star formation history of Mrk86: I. Data and models

Authors
  • de Paz, A. Gil
  • Zamorano, J.
  • Gallego, J.
  • Dominguez, F. de B.
Type
Preprint
Publication Date
Jul 18, 2000
Submission Date
Jul 18, 2000
Identifiers
DOI: 10.1051/aas:2000355
Source
arXiv
License
Unknown
External links

Abstract

We have obtained optical (BVR, [OIII]5007 and Halpha), near infrared (JHK) imaging and long-slit optical spectroscopy for the Blue Compact Dwarf galaxy Mrk86 (NGC2537). In this paper, the first of two, we present optical-near- infrared colors and emission-line fluxes for the currently star-forming regions, intemediate aged starburst and underlying stellar population. We also describe the evolutionary synthesis models used in Paper II. The R and Halpha luminosity distributions of the galaxy star-forming regions show maxima at M_R=-9.5 and L_Halpha=10^37.3 erg s^-1. The underlying stellar population shows an exponential surface brigthness profile with central value, mu_E,0=21.5 mag arcsec^-2, and scale, alpha=0.88 kpc, both measured in the R-band image. In the galaxy outer regions, dominated by this component, no significant color gradients are observed. Finally, a set of evolutionary synthesis models have been developed, covering a wide range in metallicity and burst strength.

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