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Дата изменения: Mon May 8 23:01:34 2006 Дата индексирования: Sun Dec 23 02:18:44 2007 Кодировка: |
Lots of data at many wavelengths on Virgo galaxies already exist. These can give details of the spectral energy distribution. For example, the SED for VCC 1554 is already available, from the UV all the way to the radio continuum. To understand all aspects, you need multiwavelength observations. For example, e.g. extinction corrections can be derived if we assume the absorbed energy is equal to the reradiated energy.
Such multiwavelength data can be combined to address questions about the galaxies and their histories. For example, in Gavazzi et al 2002, we look at the H-band luminosity log LH versus the stellar birthrate parameter. We can also examine the HI normal galaxies and then add the HI deficient galaxies. These typically have lower birthrates which you can clearly see if you plot residuals: the highly deficient galaxies form no stars.