Johann Aguirre - Academia.edu (original) (raw)
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Papers by Johann Aguirre
We present recent observations of the Orion nebula taken with MUSTANG, a 64 pixel TES array at 90... more We present recent observations of the Orion nebula taken with MUSTANG, a 64 pixel TES array at 90 GHz. This data, obtained with the 100m Green Bank Telescope yields a high resolution (8") map while maintaining good sensitivity to extended structure. This observation of Orion at a wavelength of 3mm is uniquely sensitive to both the free-free emission from the nebular gas ionized by the O stars in the Trapezium and thermal dust emission from the dense molecular cloud OMC 1. Combined with other data sets of comparable spatial resolution (e.g. VLA and/or GBT continuum for the free-free and SCUBA 450 and 850microns, BOLOCAM 1mm for the thermal dust emission), spectral decomposition of the MUSTANG map will be used to study the dust emissivity and its possible variation through this region which is among the most active sites of star formation near the Sun.
Science, 2007
Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a... more Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above ~ 6x10^{19} electron volts and the positions of active galactic nuclei (AGN) lying within ~ 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these cosmic rays with at least a 99% confidence level from a prescribed a priori test. The correlation we observed is compatible with the hypothesis that the highest energy particles originate from nearby extragalactic sources whose flux has not been substantially reduced by interaction with the cosmic background radiation. AGN or objects having a similar spatial distribution are possible sources.
We present recent observations of the Orion nebula taken with MUSTANG, a 64 pixel TES array at 90... more We present recent observations of the Orion nebula taken with MUSTANG, a 64 pixel TES array at 90 GHz. This data, obtained with the 100m Green Bank Telescope yields a high resolution (8") map while maintaining good sensitivity to extended structure. This observation of Orion at a wavelength of 3mm is uniquely sensitive to both the free-free emission from the nebular gas ionized by the O stars in the Trapezium and thermal dust emission from the dense molecular cloud OMC 1. Combined with other data sets of comparable spatial resolution (e.g. VLA and/or GBT continuum for the free-free and SCUBA 450 and 850microns, BOLOCAM 1mm for the thermal dust emission), spectral decomposition of the MUSTANG map will be used to study the dust emissivity and its possible variation through this region which is among the most active sites of star formation near the Sun.
Science, 2007
Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a... more Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above ~ 6x10^{19} electron volts and the positions of active galactic nuclei (AGN) lying within ~ 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these cosmic rays with at least a 99% confidence level from a prescribed a priori test. The correlation we observed is compatible with the hypothesis that the highest energy particles originate from nearby extragalactic sources whose flux has not been substantially reduced by interaction with the cosmic background radiation. AGN or objects having a similar spatial distribution are possible sources.