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Sample of minor merger of galaxies: Optical CCD surface photometry and HII region propertie | | D. L. Ferreiro
; M. G. Pastoriza
; | | Date: |
7 Sep 2004 | | Subject: | astro-ph | | Abstract: | We present the results of the B, V and I photometry of eleven southern minor mergers. The total apparent B magnitude, integrated B-V and V-I colours were measured. We built B, V, and I equivalent profiles for each galaxy and decomposed them into bulge and disk components when possible. From H$alpha$+N[II] images we have estimated the basic photometric parameters of the HII regions, such as position, size, B-V and V-I colours, H$alpha$+[NII] luminosity and $EW(Halpha+[NII])$ equivalent width. We found a linear correlation between the luminosity ratios of the components and their ratio of major diameters, leading to mass ratios between 0.04 $<$ $cal M$ $_{secondary} / cal M$ $_{primary}$ $<$ 0.2, suggesting indeed that our sample is formed by minor mergers. Most of the HII regions and evolved star-forming regions of the sample were formed between 3.6 to 13.7 Myr ago with an average of (6.3$pm$0.7) Myr. The HII region properties, luminosity, sizes and ages are similar in both components. The HII regions have log(H$alpha$+[NII]) luminosity between 38.6 and 41.7. The HII region luminosity function for the whole sample fits a power law of index $alpha$ = --1.33. The linear correlation between the luminosity $cal L$(H$alpha$+[NII]) and the size of the HII regions has slope of 2.12$pm$0.06. We found that the disk of the primary component is more luminous than those of Lu’s sample, while the disk of the secondary is smaller and fainter. | | Source: | arXiv, astro-ph/0409150 | | Services: | Forum | Review | PDF | Favorites | |
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