The GRAVITY+ Project: Towards All-sky, Faint-Science, High-Contrast Near-Infrared Interferometry at the VLTI

The GRAVITY instrument has been revolutionary for near-infrared interferometry by pushing sensitivity and precision to previously unknown limits. With the upgrade of GRAVITY and the Very Large Telescope Interferometer (VLTI) in GRAVITY+, these limits will be pushed even further, with vastly improved sky coverage, as well as faint-science and high-contrast capabilities. This upgrade includes the implementation of wide-field off-axis fringe-tracking, new adaptive optics systems on all Unit Telescopes, and laser guide stars in an upgraded facility. GRAVITY+ will open up the sky to the measurement of black hole masses across cosmic time in hundreds of active galactic nuclei, use the faint stars in the Galactic centre to probe General Relativity, and enable the characterisation of dozens of young exoplanets to study their formation, bearing the promise of another scientific revolution to come at the VLTI.Comment: Published in the ESO Messenge

Digital Copying and the Supply of Sound Recordings

One concern with digitization in markets for information goods is that unauthorized, digital copying will reduce the number and quality of original works supplied. Despite a substantial literature on the effects of piracy on demand for recorded music, information on the supply-effects of digital copying is limited. This paper presents empirical evidence that digital copying has not reduced the supply of new, copyrighted sound recordings in Germany. Even with a strong reduction in sales of sound recordings that coincided with the diffusion of digital copying technology, the annual number of new titles released to the market continued to expand. Results indicate that the number of new titles released has not deviated significantly from a long-term upward trend. The paper also presents evidence that the amount of time listening to sound recordings has not fallen over this period, suggesting no strong decline in the quality of new work

Bringing the New Adaptive Optics Module for Interferometry (NAOMI) into Operation

published in the ESO Messenge