Search Publications
Missions
Journals
Publication Years
Pc2 EMIC waves generated high off the equator in the dayside outer magnetosphere
Liu, Y. H.; Fraser, B. J.; Menk, F. W.
It is generally accepted that electromagnetic ion cyclotron (EMIC) waves are generated around the equatorial regions and propagate toward the high latitude ionospheres in both hemispheres. Here we describe a prolonged EMIC wave event in the Pc2 (0.1-0.2 Hz) frequency band above the He+ cyclotron frequency detected by the four Cluster sa…
Comparison of star formation rates from Hα and infrared luminosity as seen by Herschel
Kneib, J. -P.; Berta, S.; Magnelli, B. +56 more
We empirically MD test the relation between the SFR(LIR) derived from the infrared luminosity, LIR, and the SFR(Hα) derived from the Hα emission line luminosity using simple conversion relations. We use a sample of 474 galaxies at z = 0.06-0.46 with both Hα detection [from 20k redshift Cosmological Evolution (zCOSMOS) survey]…
The Connection between 3.3 µm Polycyclic Aromatic Hydrocarbon Emission and Active Galactic Nucleus Activity
Imanishi, Masatoshi; Kim, Ji Hoon; Woo, Jong-Hak +1 more
We investigate the connection between starburst and active galactic nucleus (AGN) activity by comparing 3.3 µm polycyclic aromatic hydrocarbon (PAH) emission with AGN properties. Utilizing the slitless spectroscopic capability of the AKARI space telescope, we observe a moderate-luminosity Type I AGN at z ~ 0.4 to measure global starburst act…
Coronal Mass Ejections from Magnetic Systems Encompassing Filament Channels Without Filaments
Pevtsov, Alexei A.; Panasenco, Olga; Martin, Sara F.
Well-developed filament channels may be present in the solar atmosphere even when there is no trace of filament material inside them. Such magnetic systems with filament channels without filaments can result in coronal mass ejections that might appear to have no corresponding solar surface source regions. In this case study, we analyze CMEs on 9 A…
Ionized gas diagnostics from protoplanetary discs in the Orion nebula and the abundance discrepancy problem
Tsamis, Y. G.; Henney, W. J.; García-Rojas, J. +5 more
We present results from integral field spectroscopy of a field located near the Trapezium Cluster using the Potsdam Multi-Aperture Spectrophotometer (PMAS). The observed field contains a variety of morphological structures: five externally ionized protoplanetary discs (also known as proplyds), the high-velocity jet HH 514 and a bowshock. Spatial d…
Is Active Region Core Variability Age Dependent?
Warren, Harry P.; Ugarte-Urra, Ignacio
The presence of both steady and transient loops in active region cores has been reported from soft X-ray and extreme-ultraviolet observations of the solar corona. The relationship between the different loop populations, however, remains an open question. We present an investigation of the short-term variability of loops in the core of two active r…
Discovery of an Active Supermassive Black Hole in the Bulgeless Galaxy NGC 4561
Ferrarese, L.; Fiore, F.; Mathur, S. +2 more
We present XMM-Newton observations of the Chandra-detected nuclear X-ray source in NGC 4561. The hard X-ray spectrum can be described by a model composed of an absorbed power law with Γ = 2.5+0.4 - 0.3 and column density NH = 1.9+0.1 - 0.2 × 1022 atoms cm-2. The absorptio…
The near-infrared detection of PSR B0540-69 and its nebula
De Luca, A.; Mignani, R. P.; Kanbach, G. +4 more
Context. The ~1700 year old PSR B0540-69 in the Large Magellanic Clouds (LMC) is considered the twin of the Crab pulsar because of its similar spin parameters, magnetic field, and energetics. PSR B0540-69 (V ~ 22.5) is also one of the very few pulsars for which both optical pulsations and polarised emission have been measured. Its optical spectrum…
Temporal variations in the acoustic signal from faculae
Karoff, C.
The integrated brightness of the Sun shows variability on time-scales from minutes to decades. This variability is mainly caused by pressure mode oscillations, by granulation and by dark spots and bright faculae on the surface of the Sun. By analysing the frequency spectrum of the integrated brightness, we can obtain greater knowledge about these …
Planetary transit candidates in the CoRoT LRa01 field
Mazeh, T.; Aigrain, S.; Alapini, A. +70 more
Context. CoRoT is a pioneering space mission whose primary goals are stellar seismology and extrasolar planets search. Its surveys of large stellar fields generate numerous planetary candidates whose lightcurves have transit-like features. An extensive analytical and observational follow-up effort is undertaken to classify these candidates.
A…