Search Publications
Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov-Gerasimenko
Kramer, Tobias; Noack, Matthias; Baum, Daniel +2 more
NuSTAR rules out a cyclotron line in the accreting magnetar candidate 4U2206+54
Reig, P.; Torrejón, J. M.; Postnov, K. +3 more
Based on our new NuSTAR X-ray telescope data, we rule out any cyclotron line up to 60 keV in the spectra of the high-mass X-ray binary 4U2206+54. In particular, we do not find any evidence of the previously claimed line around 30 keV, independently of the source flux, along the spin pulse. The spin period has increased significantly, since the las…
Exploring the spectral variability of the Seyfert 1.5 galaxy Markarian 530 with Suzaku
Gallo, L. C.; Gonzalez, A. G.; Ehler, H. J. S.
A 2012 Suzaku observation of the Seyfert 1.5 galaxy Markarian 530 was analysed and found to exhibit two distinct modes of variability, which were found to be independent from one another. First, the spectrum undergoes a smooth transition from a soft to hard spectrum. Secondly, the spectrum displays more rapid variability seemingly confined to a ve…
Oxygen and silicon abundances in Cygnus OB2. Chemical homogeneity in a sample of OB slow rotators
Herrero, A.; Comerón, F.; Simón-Díaz, S. +3 more
Context. Cygnus OB2 is a rich OB association in the Galaxy located at only ∼1.4 kpc from us which has experienced intense star formation in the last 20-25 Myr. Its stellar population shows a correlation between age and Galactic longitude. Exploring the chemical composition of its stellar content we will be able to check the degree of homogeneity o…
Aerosol properties in the upper clouds of Venus from glory observations by the Venus Monitoring Camera (Venus Express mission)
Markiewicz, Wojciech J.; Petrova, Elena V.; Shalygina, Oksana S.
From the angular positions of the glory features observed on the upper cloud deck of Venus in three VMC channels (at 0.365, 0.513, and 0.965 µm), the dominating sizes of cloud particles and their refractive indices have been retrieved, and their spatial and temporal variations have been analyzed. For this, the phase profiles of brightness we…
Size-Luminosity Scaling Relations of Local and Distant Star-forming Regions
Do, Tuan; Armus, Lee; Larkin, James E. +8 more
We investigate star-forming scaling relations using Bayesian inference on a comprehensive data sample of low- (z < 0.1) and high-redshift (1 < z < 5) star-forming regions. This full data set spans a wide range of host galaxy stellar mass (M * ∼ 106-1011 {M}⊙ ) and clump star formation rates (SFR…
In-flight performance of pulse-processing system of the ASTRO-H/Hitomi soft x-ray spectrometer
Tsujimoto, Masahiro; Eckart, Megan E.; Leutenegger, Maurice A. +15 more
We summarize results of the initial in-orbit performance of the pulse shape processor (PSP) of the soft x-ray spectrometer instrument onboard ASTRO-H (Hitomi). Event formats, kind of telemetry, and the pulse-processing parameters are described, and the parameter settings in orbit are listed. The PSP was powered-on 2 days after launch, and the even…
Complete IRAC Mapping of the CFHTLS-DEEP, MUSYC, and NMBS-II Fields
Muzzin, Adam; van Dokkum, Pieter; Bezanson, Rachel +19 more
The IRAC mapping of the NMBS-II fields program is an imaging survey at 3.6 and 4.5 µm with the Spitzer Infrared Array Camera (IRAC). The observations cover three Canada-France-Hawaii Telescope Legacy Survey Deep (CFHTLS-D) fields, including one also imaged by AEGIS, and two MUSYC fields. These are then combined with archival data from all pr…
On the Performance of Multi-Instrument Solar Flare Observations During Solar Cycle 24
Milligan, Ryan O.; Ireland, Jack
The current fleet of space-based solar observatories offers us a wealth of opportunities to study solar flares over a range of wavelengths. Significant advances in our understanding of flare physics often come from coordinated observations between multiple instruments. Consequently, considerable efforts have been, and continue to be, made to coord…
Extremely Low-Frequency Waves Inside the Diamagnetic Cavity of Comet 67P/Churyumov-Gerasimenko
Gunell, H.; Eriksson, A.; Karlsson, T. +7 more
The European Space Agency/Rosetta mission to comet 67P/Churyumov-Gerasimenko has provided several hundred observations of the cometary diamagnetic cavity induced by the interaction between outgassed cometary particles, cometary ions, and the solar wind magnetic field. Here we present the first electric field measurements of four preperihelion and …