SDSS - III : Massive Spectroscopic Surveys of the Distant Universe , the Milky Way Galaxy , and Extra - Solar Planetary Systems
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Searching for Extragalactic Planets
Are there other planetary systems in our Universe? Indirect evidence has been found for planets orbiting other stars in our galaxy: the gravity of orbiting planets makes the star wobble, and the resulting periodic Doppler shifts have been detected for about a dozen stars [1]. But are there planets in other galaxies, millions of light years away? Here we suggest a method to search for extragalac...
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The Sloan Digital Sky Survey (SDSS) is collecting photometry and intermediate resolution spectra for 105 stars in the thick-disk and stellar halo of the Milky Way. This massive dataset can be used to infer the properties of the stars that make up these structures, and considerably deepen our vision of the old components of the Galaxy. We devise tools for automatic analysis of the SDSS photometr...
متن کاملGaussian Processes for Identifying Damped Lyman-α Systems in Spectroscopic Surveys
We present an application of Gaussian processes to the problem of discovering “damped Lyman-α systems” (DLAs), dense regions of hydrogen gas that are likely the birthplace of galaxies like the Milky Way. We apply this method to a large spectroscopic survey of quasars from the Sloan Digital Sky Survey III (SDSS-III).
متن کاملProbing the Mass Fraction of MACHOs in Extragalactic Halos
Current microlensing searches calibrate the mass fraction of the Milky Way halo which is in the form of Massive Compact Halo Objects (MACHOs). We show that surveys like the Sloan Digital Sky Survey (SDSS) can probe the same quantity in halos of distant galaxies. Microlensing of background quasars by MACHOs in intervening galaxies would distort the equivalent width distribution of the quasar emi...
متن کاملMeasuring Dark Energy with the Wide–Field Multi–Object Spectrograph (WFMOS)⋆
Dark energy is one of the greatest scientific challenges of the 21 century. One of the key questions facing cosmologists is whether dark energy is either a breakdown of General Relativity on large scales or a new form of matter in the Universe with a negative effective pressure. This question can only be answered through a suite of different observations as a function of redshift. In this paper...
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تاریخ انتشار 2008