Search Publications
Properties of small meteoroids studied by meteor video observations
Vojáček, V.; Borovička, J.; Koten, P. +2 more
Aims: The complex study of millimetre-sized meteoroids can reveal more about the structure and origin of population of these meteoroids.
Methods: Double-station video observations, paired with spectroscopic video observations, were used to study small meteoroids. In total 152 sporadic and shower meteors of maximum brightness between magn…
Dynamical evolution of star-forming regions: III. Unbound stars and predictions for Gaia
Parker, Richard J.; Schoettler, Christina; Wright, Nicholas J. +3 more
We use N-body simulations to probe the early phases of the dynamical evolution of star-forming regions and focus on mass and velocity distributions of unbound stars. In this parameter space study, we vary the initial virial ratio and degree of spatial and kinematic substructure and analyse the fraction of stars that become unbound in two different…
Keck OSIRIS AO LIRG Analysis (KOALA): Feedback in the Nuclei of Luminous Infrared Galaxies
Inami, Hanae; Murphy, Eric; Díaz-Santos, Tanio +21 more
The role of feedback in triggering or quenching star formation and hence driving galaxy evolution can be directly studied with high-resolution integral field observations. The manifestation of feedback in shocks is particularly important to examine in galaxy mergers, where violent interactions of gas take place in the interstellar medium during th…
An Automatic Detection Algorithm Applied to Fast Magnetosonic Waves With Observations of the Van Allen Probes
Yuan, Zhigang; Yao, Fei; Yu, Xiongdong +2 more
Fast magnetosonic (MS) waves can play an important role in the evolution of the inner magnetosphere. However, there is still not an effective method to quantitatively identify such waves for observations of the Van Allen Probes reasonably. In this paper, we used Van Allen Probes data from 18 September 2012 to 30 September 2014 to find a more compr…
ALMA Detection of Dark Chromospheric Holes in the Quiet Sun
Solanki, Sami K.; White, Stephen M.; Loukitcheva, Maria A.
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of a quiet-Sun region at a wavelength of 3 mm, obtained during the first solar ALMA cycle on 2017 April 27, and compare them with available chromospheric observations in the UV and visible as well as with photospheric magnetograms. ALMA images clearly reveal the presence o…
Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
Kuzuhara, M.; Tamura, M.; Alonso, R. +57 more
We report the analysis of additional multiband photometry and spectroscopy and new adaptive optics (AO) imaging of the nearby planetary microlensing event TCP J05074264+2447555 (Kojima-1), which was discovered toward the Galactic anticenter in 2017 (Nucita et al.). We confirm the planetary nature of the light-curve anomaly around the peak while fi…
Consistent accretion-induced heating of the neutron-star crust in MXB 1659-29 during two different outbursts
Degenaar, N.; Wijnands, R.; Homan, J. +10 more
Monitoring the cooling of neutron-star crusts heated during accretion outbursts allows us to infer the physics of the dense matter present in the crust. We examine the crust cooling evolution of the low-mass X-ray binary MXB 1659-29 up to ∼505 days after the end of its 2015 outburst (hereafter outburst II) and compare it with what we observed afte…
Mapping the Interstellar Reddening and Extinction toward Baade’s Window Using Minimum Light Colors of ab-type RR Lyrae Stars: Revelations from the De-reddened Color-Magnitude Diagrams
Cenko, S. Bradley; Cunha, Katia; Olsen, Knut +21 more
We have obtained repeated images of six fields toward the Galactic bulge in five passbands (u, g, r, i, z) with the DECam imager on the Blanco 4 m telescope at CTIO. From more than 1.6 billion individual photometric measurements in the field centered on Baade’s window, we have detected 4877 putative variable stars. A total of 474 of these have bee…
Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB stars
McMillan, P. J.; Oey, M. S.; Borges Fernandes, M. +8 more
Context. Elemental abundance gradients in galactic disks are important constraints for models of how spiral galaxies form and evolve. However, the abundance structure of the outer disk region of the Milky Way is poorly known, which hampers our understanding of the spiral galaxy that is closest to us and that can be studied in greatest detail. Youn…
Background modelling for γ-ray spectroscopy with INTEGRAL/SPI
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +3 more
Context. The coded-mask spectrometer-telescope SPI on board the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) records photons in the energy range between 20 and 8000 keV. A robust and versatile method for modelling the dominating instrumental background radiation is difficult to establish for such a telescope in the rapidly changing s…