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Multiwavelength Observations of the Gas-rich Host Galaxy of PDS 456: A New Challenge for the ULIRG-to-QSO Transition Scenario
PDS 456 IRAS 08572+3915
2014/12/24
We report new K-band, radio continuum, and CO (1-0) imaging observations and 850 μm photometric observations of PDS 456, the most luminous QSO in the local universe (z < 0.3). The 06 resolution K-band...
I show that, in the context of MOND, non-isothermal models, approximated by high order polytropic spheres, are consistent with the observations of the radial distribution of the line-of-sight velocity...
Cosmic acceleration and the challenge of modifying gravity
Cosmic acceleration challenge of modifying gravity
2010/11/10
I briefly discuss the challenges presented by attempting to modify general relativity to obtain an explanation for the observed accelerated expansion of the universe. Foremost among these are the ques...
The Gaia Spectroscopic Instrument (RVS): A Technical Challenge
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2010/12/23
The lack of radial velocity data in the Hipparcos catalogue was considered a significant deficiency, so when Gaia was conceived, a spectrometer was a core constituent of its payload. The Gaia Radial V...
The Challenge of Predicting the Occurrence of Intense Storms
Sun coronal mass ejection geomagnetic storms space weather
2010/9/16
Geomagnetic super-storms of October and November 2003 are compared in order to identify solar and interplanetary variables that influence the magnitude of geomagnetic storms. Although these superstorm...
Cosmological thinking: cultural heritage and challenge
Cosmological thinking cultural heritage
2010/3/22
The limitations of current technology do not allow one to foresee the expansion of the humankind beyond our planet for at least a few decades. Furthermore, the laws of physics, as for as they are know...
FERMI'S PARADOX - THE LAST CHALLENGE FOR COPERNICANISM?
Astrobiology Extraterrestrial intelligence Galaxy: evolution History and philosophy of astronomy
2010/10/29
We review Fermi's paradox (or the "Great Silence" problem), not
only arguably the oldest and crucial problem for the Search for ExtraTerrestrial
Intelligence (SETI), but also a conundrum of profound...
The Challenge of Predicting the Occurrence of Intense Storms
Sun:coronal mass ejection geomagnetic storms space weather
2009/5/7
Geomagnetic super-storms of October and November 2003 are compared in order to identify solar and interplanetary variables that influence the magnitude of geomagnetic storms. Although these superst...