| When: | Back to Calendar 29/01/2015 @ 4:00 pm - 5:00 pm | Where: | Auditorio DCI |
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| Categories: | Seminar | |
Se les invita cordialmente a que asistan al Seminario Departamental este jueves 29 de enero a las 4:00 p.m. en el auditorio de la DCI.
PONENTE: Dr. Omar López-Cruz, INAOE
TÍTULO: Sci-HI: First Results.
RESUMEN: We present the first results from the Sonda Cosmológica de las Islas para la Detección de Hidrógeno Neutro (Sci-HI) experiment. Sci-HI is an international collaboration, it represent the first Mexican effort to join the race for the first detection of the 21cm spectral signature of the formation of the first stars, galaxies, and quasars, 2 million years after the Big Bang. We have developed simple but robust instrumentation with mostly off-the-shelf equipment. However, our strategic advantage is given by the islands within Mexico´s Exclusive Economic Zone (EEZ)*, we have discovered that some of them are among the best radio-quiet zones in the world. Our experiment aims at detecting the all-sky-averaged 21 cm spectrum in the redshift range 14.8<z<22.7. Sci-HI final designed consist of a single wide-band antenna, and electronics for detection, preprocessing, and data acquisition. Preliminary observations were completed in June 2013 at Isla Guadalupe, located in the Pacific Ocean 260 km off the coast of the Baja California Peninsula. This island was declared a Reserved of the Biosphere by UNESCO in 2005. Our observations have set the first upper limit for the detection of the end of the dark ages at z~20. In this talk I discuss the cosmological implications, and describe improvements for future collaboration with the Dark Energy Radio Explorer (DARE). Dare is a space probe that will explore the same redshift range as Sci-HI but using the Moon as a shield.
*Sci-HI enhances the scientific use of the EEZ, and the sovereignty of Mexico over those territories.