Search Publications
Determining the fraction of reddened quasars in COSMOS with multiple selection techniques from X-ray to radio wavelengths
Geier, S.; Milvang-Jensen, B.; Vestergaard, M. +8 more
The sub-population of quasars reddened by intrinsic or intervening clouds of dust are known to be underrepresented in optical quasar surveys. By defining a complete parent sample of the brightest and spatially unresolved quasars in the COSMOS field, we quantify to which extent this sub-population is fundamental to our understanding of the true pop…
Tracking of magnetic flux concentrations over a five-day observation, and an insight into surface magnetic flux transport
Iida, Yusuke
The solar dynamo problem is the question of how the cyclic variation in the solar magnetic field is maintained. One of the important processes is the transport of magnetic flux by surface convection. To reveal this process, the dependence of the squared displacement of magnetic flux concentrations on the elapsed time is investigated in this paper …
Multiple Outflows in the Giant Eruption of a Massive Star
Humphreys, Roberta M.; Jones, Terry J.; Gordon, Michael S. +1 more
The supernova impostor PSN J09132750+7627410 in NGC 2748 reached a maximum luminosity of ≈-14 mag. It was quickly realized that it was not a true supernova, but another example of a nonterminal giant eruption. PSN J09132750+7627410 is distinguished by multiple P Cygni absorption minima in the Balmer emission lines that correspond to outflow veloci…
SZ/X-ray scaling relations using X-ray data and Planck Nominal maps
Atrio-Barandela, F.; De Martino, I.
We determine the relation between the Comptonization parameter predicted using X-ray data YC, Xray and the X-ray luminosity LX, both magnitudes derived from ROSAT data, with the Comptonization parameter YC, SZ measured on Planck 2013 foreground cleaned Nominal maps. The 560 clusters of our sample includes clusters …
Investigating the Circumstellar Disk of the Be Shell Star 48 Librae
Okazaki, A. T.; Carciofi, A. C.; Bednarski, D. +6 more
A global disk oscillation implemented in the viscous decretion disk (VDD) model has been used to reproduce most of the observed properties of the well known Be star ζ Tau. 48 Librae shares several similarities with ζ Tau—they are both early-type Be stars, display shell characteristics in their spectra, and exhibit cyclic V/R variations—but has som…
Challenging Some Contemporary Views of Coronal Mass Ejections. I. The Case for Blast Waves
Pizzo, V. J.; Howard, T. A.
Since the closure of the “solar flare myth” debate in the mid-1990s, a specific narrative of the nature of coronal mass ejections (CMEs) has been widely accepted by the solar physics community. This narrative describes structured magnetic flux ropes at the CME core that drive the surrounding field plasma away from the Sun. This narrative replaced …
SELFI: an object-based, Bayesian method for faint emission line source detection in MUSE deep field data cubes
Bacon, Roland; Meillier, Céline; Chatelain, Florent +4 more
We present SELFI, the Source Emission Line FInder, a new Bayesian method optimized for detection of faint galaxies in Multi Unit Spectroscopic Explorer (MUSE) deep fields. MUSE is the new panoramic integral field spectrograph at the Very Large Telescope (VLT) that has unique capabilities for spectroscopic investigation of the deep sky. It has prov…
The [Ne III] Jet of DG Tau and its Ionization Scenarios
Herczeg, Gregory J.; Liu, Chun-Fan; Shang, Hsien +1 more
Forbidden neon emission from jets of low-mass young stars can be used to probe the underlying high-energy processes in these systems. We analyze spectra of the jet of DG Tau obtained with the Very Large Telescope/X-Shooter spectrograph in 2010. [Ne III] λ 3869 is clearly detected in the innermost 3″ microjet and the outer knot located at ∼ 6\build…
A new sample of X-ray selected narrow emission-line galaxies. II. Looking for True Seyfert 2
Watson, M. G.; Pons, E.
A sample of X-ray and optically selected narrow emission-line galaxies (769 sources) from the 3XMM catalogue cross-correlated with SDSS (DR9) catalogue has been studied. Narrow-emission line active galactic nuclei (AGN; type-2) have been selected on the basis of their emission line ratios and/or X-ray luminosity. We have looked for X-ray unobscure…
Radio Properties of Young Stellar Objects in the Core of the Serpens South Infrared Dark Cloud
Gutermuth, Robert A.; Tobin, John J.; Kern, Nicholas S. +2 more
We present deep radio continuum observations of the star-forming core of the Serpens South Infrared Dark Cloud with the Karl G. Jansky Very Large Array. Observations were conducted in two bands centered at 7.25 GHz (4.14 cm) and 4.75 GHz (6.31 cm) with a {σ }{rms} of 8.5 and 11.1 µJy/beam, respectively. We also use 2MASS, Spitzer …