NOAO >   Observing Info >   Approved Programs >   2007B-0458

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Proposal Information for 2007B-0458


PI: Daniel Rosa-Gonzalez, INAOE, danrosa@inaoep.mx
Address: Astronomy Department, Enrique Erro 1, Tonantzintla, Puebla 72840, Mexico

CoI: Henrique R. Schmitt, Naval Research Laboratory
CoI: Elena Terlevich, INAOE, Mexico
CoI: Roberto Cid Fernandes, Universidade Federal de Santa Catarina, Brasil
CoI: Eduardo Telles, Observatorio Nacional, Rio de Janeiro, Brasil
CoI: Roberto Terlevich, INAOE, Mexico

Title: Deep Imaging of HII Galaxies: Characterizing the Evolutionary Stage of the Youngest Bursts

Abstract: We propose to obtain 5 broad band (UBVRI) and 3 narrow band (H(alpha), H(beta) and [OIII]) images of extreme HII galaxies to study the properties of massive stellar clusters (MSCs). Knowledge about MSCs in their early stages - ages lower than about 10 Myr - remains obscured because of their fast evolution and because the newly formed stars may still be deep inside the progenitor molecular cloud making their detection difficult. Based on an extensive VLA radio campaign, we recently published a catalogue of HII galaxies which might harbor the youngest massive stellar clusters known in the nearby universe (Rosa- Gonzalez et al. 2007). The studied HII galaxies are characterized by having a flat or inverted radio slope and strong hydrogen emission lines. The star forming regions in compact HII galaxies have typical sizes of several parsecs, therefore the deep imaging proposed here combined with synthetic stellar population codes, will be used to derive mean age, extinction and excitation maps and, in conjunction with high resolution radio maps, to localize the position of the youngest MSCs.


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NOAO >   Observing Info >   Approved Programs >   2007B-0458

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