474 research outputs found
Discussion: The future is our future
No full textThe last day of the Kavli-IAU symposium featured a fourth discussion, which was about the future. The discussion focused on the changing landscape of scientific research and the allocation of funding and their implications for the ideal scientist of tomorrow. It was chaired by H. Landt, who was joined by the four panellists E. Chatzichristou, J. R. A. Davenport, M. G. Edmunds and D. H. Grinspoon
On the dust geometry in radio-loud active galactic nuclei
No full textWe use photometric and spectroscopic infrared observations obtained with the Spitzer Space Telescope of 12 radio-loud active galactic nuclei to investigate the dust geometry. Our approach is to look at the change of the infrared spectral energy distribution (SED) and the strength of the 10-μm silicate feature with jet viewing angle. We find that (i) a combination of three or four blackbodies fits well the infrared SED, (ii) the sources viewed closer to the jet axis appear to have stronger warm (∼300–800 K) and cold (∼150–250 K) dust emissions relative to the hot component and (iii) the silicate features are always in emission and strongly redshifted. We test clumpy torus models and find that (i) they approximate well the mid-infrared part of the SED, but significantly underpredict the fluxes at both near- and far-infrared wavelengths; (ii) they can constrain the dust composition (in our case to that of the standard interstellar medium); (iii) they require relatively large (∼10–20 per cent the speed of light) redward displacements and (iv) they give robust total mass estimates, but are insensitive to the assumed geometry
The near-infrared broad emission line region of active galactic nuclei – II. The 1-μm continuum
No full textWe use quasi-simultaneous near-infrared (near-IR) and optical spectroscopy from four observing runs to study the continuum around 1 μm in 23 well-known broad emission line active galactic nuclei (AGN). We show that, after correcting the optical spectra for host galaxy light, the AGN continuum around this wavelength can be approximated by the sum of mainly two emission components, a hot dust blackbody and an accretion disc. The accretion disc spectrum appears to dominate the flux at ∼ 1 μm, which allows us to derive a relation for estimating AGN black hole masses based on the near-IR virial product. This result also means that a near-IR reverberation programme can determine the AGN state independent of simultaneous optical spectroscopy. On average we derive hot dust blackbody temperatures of ∼1400 K, a value close to the sublimation temperature of silicate dust grains, and relatively low hot dust covering factors of ∼7 per cent. Our preliminary variability studies indicate that in most sources, the hot dust emission responds to changes in the accretion disc flux with the expected time lag; however, a few sources show a behaviour that can be attributed to dust destruction
Copia der newen zeytung auss Presillg landt; facsimileabdruck herausg. von dr. Hans H. Bockwitz.
No full text"In 500 nummerierten[!] exemplaren gedruckt. Nr. 355.""Nachweis der ausgaben ... der fundorte und fundstellen [und] ... der facsimile-ausgaben, textabdrucke und übersetzungen": p. 13-15.Reproductions of (1) Copia der Newen Zeytung auss Presillg Landt [n.p., 1520?] (2) Copia der Newen eytung[!] auss Presillg Landt. Augsburg, Erhart Öglin [n.d.] (t.-p., recto of first and verso of last leaf only) cf. Harrisse, Bibl. amer. vetus., no. 99, and p. 26-27 of the Additions.Mode of access: Internet
Hessel Gerritsz.: Beschryvinghe vander Samoyeden Landt in Tartarien (1612)
No full textBeschryvinghe vander Samoyeden Landt in Tartarien. Nieulijcks onder 't ghebiedt der Moscoviten gebracht. Wt de Russche tale overgheset, Anno 1609. Met een verhael Vande opsoeckingh ende ontdeckinge vande nieuwe deurgang ofte straet int Noordwesten na de Rijcken van China ende Cathay. Ende Een Memoriael gepresenteert aenden Coningh van Spaengien, belanghende de ontdeckinghe ende gheleghentheyt van 't Land ghenaemt Australia Incognita. t'Amsterdam, by Hessel Gerritsz. Boeckvercooper, opt Water, inde Pascaert, Anno 1612
Discussion: The future is our future
No full textThe last day of the Kavli-IAU symposium featured a fourth discussion, which was about the future. The discussion focused on the changing landscape of scientific research and the allocation of funding and their implications for the ideal scientist of tomorrow. It was chaired by H. Landt, who was joined by the four panellists E. Chatzichristou, J. R. A. Davenport, M. G. Edmunds and D. H. Grinspoon
The Deep X-ray Radio Blazar Survey (DXRBS) - II. New identifications
No full textThe definitive version may be found at www.wiley.comHermine Landt, Paolo Padovani, Eric S. Perlman, Paolo Giommi, Hayley Bignall and Anastasios Tzioumi
Hessel Gerritsz.: Beschryvinghe vander Samoyeden Landt in Tartarien (1612)
No full textBeschryvinghe vander Samoyeden Landt in Tartarien. Nieulijcks onder 't ghebiedt der Moscoviten gebracht. Wt de Russche tale overgheset, Anno 1609. Met een verhael Vande opsoeckingh ende ontdeckinge vande nieuwe deurgang ofte straet int Noordwesten na de Rijcken van China ende Cathay. Ende Een Memoriael gepresenteert aenden Coningh van Spaengien, belanghende de ontdeckinghe ende gheleghentheyt van 't Land ghenaemt Australia Incognita. t'Amsterdam, by Hessel Gerritsz. Boeckvercooper, opt Water, inde Pascaert, Anno 1612
Waere devotie tot het bitter lyden Christi verdeelt in twee deelen.
No full textDatum uit goed-keuringeBroederschap van het H. KruysGeestelyke pelgrimagie naer het H. Landt[voorlopige beschrijving]Europeana-GoogleBook
Beschryvinge van de Noordtsche Landen, Die gelegen zijn onder den Kouden Noordt-Pool (c. 1660)
No full textBeschryvinge van de Noordtsche Landen, Die gelegen zijn onder den Kouden Noordt-Pool, Als Denemarcken, Sweeden, Noorweghen, Finlandt, Laplandt, Godtlandt, Poolen, Pruyssen, Ys-Landt, &c. Waer in verhaelt werdt de verscheydenheyt der Coopmanschappen, en Kleedinge der Inwoonderen. Mitsgaders: Eenighe Ureemdigheden die men aldaer te Lande vindt, soo van Beesten, Voogelen, Vissen, en Zee-Monsters, Van Nieuws oversien, ende vermeerdert. t’ Amsterdam, Gedruckt By Gillis Joosten Saeghman, in de Nieuwe-straet, Ordinaris Drucker van de Iournalen ter Zee, en de Reysen te Lande. [c. 1660
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