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  • tidal dwarf galaxies at intermediate redshifts

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 820
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we present the first attempt at measuring the production rate of tidal dwarf galaxies (tdgs) and estimating their contribution to the overall dwarf population. using hst/acs deep imaging data from goods and gems surveys in conjunction with photometric redshifts from combo-17 survey, we performed a morphological analysis for a sample of merging/interacting galaxies in the extended chandra deep field south and identified tidal dwarf candidates in the rest-frame optical bands. we estimated a production rate about 1.4×10−5 per gyr per comoving volume for long-lived tdgs with stellar mass 3×108−9 m at 0.5<z<1.1. together with galaxy merger rates and tdg survival rate from the literature, our results suggest that only a marginal fraction (less than 10%) of dwarf galaxies in the local universe could be tidally-originated. tdgs in our sample are on average bluer than their host galaxies in the optical. stellar population modelling of optical to near-infrared spectral energy distributions (seds) for two tdgs favors a burst component with age 400/200 myr and stellar mass 40%/26% of the total, indicating that a young stellar population newly formed in tdgs. this is consistent with the episodic star formation histories found for nearby tdgs.

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