Search Publications
Spitzer and Herschel Multiwavelength Characterization of the Dust Content of Evolved H II Regions
Bernard, J. -P.; Natoli, P.; Paladini, R. +8 more
We have analyzed a uniform sample of 16 evolved H II regions located in a 2° × 2° Galactic field centered at (l,b) = (30°, 0°) and observed as part of the Herschel Hi-GAL survey. The evolutionary stage of these H II regions was established using ancillary radio-continuum data. By combining Hi-GAL PACS (70 µm, 160 µm) and SPIRE (250 &mi…
A Stellar Dynamical Mass Measurement of the Black Hole in NGC 3998 from Keck Adaptive Optics Observations
Barth, Aaron J.; Sarzi, Marc; van den Bosch, Remco C. E. +1 more
We present a new stellar dynamical mass measurement of the black hole in the nearby, S0 galaxy NGC 3998. By combining laser guide star adaptive optics observations obtained with the OH-Suppressing Infrared Imaging Spectrograph on the Keck II telescope with long-slit spectroscopy from the Hubble Space Telescope and the Keck I telescope, we map out …
Ion densities and composition of Titan's upper atmosphere derived from the Cassini Ion Neutral Mass Spectrometer: Analysis methods and comparison of measured ion densities to photochemical model simulations
Edberg, Niklas J. T.; Liang, Mao-Chang; Mandt, Kathleen E. +16 more
The Cassini Ion Neutral Mass Spectrometer (INMS) has measured both neutral and ion species in Titan's upper atmosphere and ionosphere and the Enceladus plumes. Ion densities derived from INMS measurements are essential data for constraining photochemical models of Titan's ionosphere. The objective of this paper is to present an optimized method fo…
The rotation of field stars from CoRoT data
Micela, G.; Favata, F.; Affer, L. +1 more
We present period measurements of a large sample of field stars in the solar neighbourhood, observed by the COnvection ROtation and planetary Transits (CoRoT) satellite in two different directions of the Galaxy. The presence of a period was detected using the Lomb-Scargle normalized periodogram technique and the autocorrelation analysis. The asses…
Broad-band observations of the Be/X-ray binary pulsar RX J0440.9+4431: discovery of a cyclotron absorption line
Tsygankov, S. S.; Lutovinov, A. A.; Krivonos, R. A.
We report the results of an analysis of data obtained with the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), Swift and Rossi X-ray Timing Explorer (RXTE) observatories during the 2010 April and September outbursts of the X-ray pulsar RX J0440.9+4431. The temporal and spectral properties of the pulsar in a wide energy band (0.6-120 ke…
3D Reconstruction of a Rotating Erupting Prominence
Török, T.; Thompson, W. T.; Kliem, B.
A bright prominence associated with a coronal mass ejection (CME) was seen erupting from the Sun on 9 April 2008. This prominence was tracked by both the Solar Terrestrial Relations Observatory (STEREO) EUVI and COR1 telescopes, and was seen to rotate about the line of sight as it erupted; therefore, the event has been nicknamed the "Cartwheel CME…
Coronal activity cycles in nearby G and K stars. XMM-Newton monitoring of 61 Cygni and α Centauri
Schmitt, J. H. M. M.; Robrade, J.; Favata, F.
Context. While we have ample evidence of stellar analogues to the solar activity cycle for chromospheric activity, very little is known about stellar coronal cycles and their possible similarities to the solar behavior.
Aims: An ongoing X-ray monitoring program of solar-like stars with XMM-Newton is performed to investigate coronal activity c…
An optical/NIR survey of globular clusters in early-type galaxies. III. On the colour bimodality of globular cluster systems
Larsen, S. S.; Kuntschner, H.; Cantiello, M. +4 more
Context. The interpretation that bimodal colour distributions of globular clusters (GCs) reflect bimodal metallicity distributions has been challenged. Non-linearities in the colour to metallicity conversions caused for example by the horizontal branch (HB) stars may be responsible for transforming a unimodal metallicity distribution into a bimoda…
The universal Einstein radius distribution from 10 000 SDSS clusters
Broadhurst, Tom; Oguri, Masamune; Zitrin, Adi +5 more
We present results from strong lens modelling of 10 000 Sloan Digital Sky Survey (SDSS) clusters, to establish the universal distribution of Einstein radii. Detailed lensing analyses have shown that the inner mass distribution of clusters can be accurately modelled by assuming light traces mass, successfully uncovering large numbers of multiple im…
Evolution of the observed Lyα luminosity function from z = 6.5 to z = 7.7: evidence for the epoch of reionization?
Kneib, J. -P.; Lidman, C.; Willis, J. +17 more
Aims: Lyα emitters (LAEs) can be detected out to very high redshifts during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Lyα transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring the Lyα luminosity function (LF) of Lyα emi…