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A Changing-Look AGN to Be Probed by X-ray Polarimetry
Miniutti, Giovanni; Agís-González, Beatriz; Hutsemékers, Damien
Active galactic nuclei (AGN) produce the highest intrinsic luminosities in the Universe from within a compact region. The central engine is thought to be powered by accretion onto a supermassive black hole. A fraction of this huge release of energy influences the evolution of the host galaxy, and in particular, star formation. Thus, AGN are key as…
Spectroscopy of Planetary Nebulae with Herschel: A Beginners Guide
Exter, Katrina
A brief overview of the Herschel Space Telescope PACS and SPIRE spectrographs is given, pointing out aspects of working with the data products that should be considered by anyone using them. Some preliminary results of Planetary Nebulae (PNe) taken from the Herschel Planetary Nebula Survey (HerPlaNs) programme are then used to demonstrate what can…
Proper Motions of Jets on the Kiloparsec Scale: New Results with HST
Anderson, Jay; Sparks, William B.; Georganopoulos, Markos +7 more
The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we are now able to reach accuracies in proper-motion measurements on the order of a tenth of a mill…
Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
Lähteenmäki, Anne; the Planck Collaboration
The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time. Using Planck and simultaneous auxiliary radio data ranging from 1 GHz to 857 GHz, spectra for 104 bright northern extragalactic radio sources (most of them AGN) have been assembled; in these, the …