http://www.rssboard.org/rss-specification 720 XTF Search Results (expand=subject;f1-spectral-Type=X-ray;f2-subject=Chandra Deep Field South;f3-facility=Chandra X-ray Observatory;f4-instrument=Advanced CCD Imaging Spectrometer (ACIS)) http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f1-spectral-Type%3DX-ray;f2-subject%3DChandra%20Deep%20Field%20South;f3-facility%3DChandra%20X-ray%20Observatory;f4-instrument%3DAdvanced%20CCD%20Imaging%20Spectrometer%20(ACIS) Results for your query: expand=subject;f1-spectral-Type=X-ray;f2-subject=Chandra Deep Field South;f3-facility=Chandra X-ray Observatory;f4-instrument=Advanced CCD Imaging Spectrometer (ACIS) Thu, 01 Jan 1970 12:00:00 GMT Chandra Million Second Exposure. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/chandra-deep-field/chandra-deep-field.dc.xml The Chandra Deep Field South refers to a location in space that offers a relatively clear view through the clouds of gas in our Galaxy, allowing us to clearly see the rest of the Universe in X-rays. This image was created by putting together multiple exposures from Chandra’s Advanced CCD Imaging Spectrometer for a cumulative exposure time of over one-million seconds. The multiwavelength observations of this region were carried out by a team led by Riccardo Giacconi in collaboration with scientists from the Very Large Telescope and the Paranal Observatory, both in Chile. Through the course of these investigations, the X-ray background was determined to originate from the central supermassive black holes of distant galaxies. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/chandra-deep-field/chandra-deep-field.dc.xml Thu, 01 Jan 1970 12:00:00 GMT