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Radio continuum properties of luminous infrared galaxies. Identifying the presence of an AGN in the radio
Murphy, E. J.; Armus, L.; Vardoulaki, E. +7 more
Context. Luminous infrared galaxies (LIRGs) are systems enshrouded in dust, which absorbs most of their optical/UV emission and radiates it again in the mid- and far-infrared. Radio observations are largely unaffected by dust obscuration, enabling us to study the central regions of LIRGs in an unbiased manner.
Aims: The main goal of this proj…
Dark Matter Line Emission Constraints from NuSTAR Observations of the Bullet Cluster
Harrison, F. A.; Hornstrup, A.; Stern, D. +10 more
Some dark matter candidates, e.g., sterile neutrinos, provide observable signatures in the form of mono-energetic line emission. We present the first search for dark matter line emission in the 3-80 {keV} range in a pointed observation of the Bullet Cluster with NuSTAR. We do not detect any significant line emission and instead we derive upper lim…
Optical confirmation and redshift estimation of the Planck cluster candidates overlapping the Pan-STARRS Survey
Price, P. A.; Desai, S.; Chambers, K. C. +16 more
We report results of a study of Planck Sunyaev-Zel'dovich effect selected galaxy cluster candidates using the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS) imaging data. We first examine 150 Planck-confirmed galaxy clusters with spectroscopic redshifts to test our algorithm for identifying optical counterparts and measuring t…
Relationship between the column density distribution and evolutionary class of molecular clouds as viewed by ATLASGAL
Henning, Th.; Beuther, H.; Kainulainen, J. +2 more
We present the first study of the relationship between the column density distribution of molecular clouds within nearby Galactic spiral arms and their evolutionary status as measured from their stellar content. We analyze a sample of 195 molecular clouds located at distances below 5.5 kpc, identified from the ATLASGAL 870 µm data. We define…
The stellar kinematics of corotating spiral arms in Gaia mock observations
Cropper, Mark; Grand, Robert J. J.; Minchev, Ivan +3 more
We have observed an N-body/smoothed particle hydrodynamics simulation of a Milky Way-like barred spiral galaxy. We present a simple method that samples N-body model particles into mock Gaia stellar observations and takes into account stellar populations, dust extinction and Gaia's science performance estimates. We examine the kinematics of stars w…
Globular cluster interstellar media: ionized and ejected by white dwarfs
Zijlstra, A. A.; McDonald, I.
Ultraviolet radiation from white dwarfs can efficiently clear Galactic globular clusters (GCs) of their intracluster medium (ICM). This solves the problem of the missing ICM in clusters, which is otherwise expected to build up to easily observable quantities. To show this, we recreate the ionizing flux in 47 Tuc, following randomly generated stars…
Intensities and spatiotemporal variability of equatorial noise emissions observed by the Cluster spacecraft
Santolík, O.; Němec, F.; Cornilleau-Wehrlin, N. +1 more
Equatorial noise (EN) emissions are electromagnetic waves observed in the equatorial region of the inner magnetosphere at frequencies between the proton cyclotron frequency and the lower hybrid frequency. We present the analysis of 2229 EN events identified in the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment data of the Cluste…
Multispacecraft current estimates at swarm
Dunlop, M. W.; Shen, C.; Lühr, H. +8 more
During the first several months of the three-spacecraft Swarm mission all three spacecraft came repeatedly into close alignment, providing an ideal opportunity for validating the proposed dual-spacecraft method for estimating current density from the Swarm magnetic field data. Two of the Swarm spacecraft regularly fly side-by-side in closely simil…
The Entire Virial Radius of the Fossil Cluster RX J1159+5531: I. Gas Properties
Brighenti, Fabrizio; Gastaldello, Fabio; Su, Yuanyuan +1 more
Previous analysis of the fossil-group/cluster RX J1159+5531 with X-ray observations from a central Chandra pointing and an offset-north Suzaku pointing indicate a radial intracluster medium (ICM) entropy profile at the virial radius (Rvir) consistent with predictions from gravity-only cosmological simulations, in contrast to other cool-…
The most obscured AGN in the COSMOS field
Berta, S.; Pozzi, F.; Vignali, C. +11 more
Highly obscured active galactic nuclei (AGN) are common in nearby galaxies, but are difficult to observe beyond the local Universe, where they are expected to significantly contribute to the black hole accretion rate density. Furthermore, Compton-thick (CT) absorbers (NH ≳ 1024 cm-2) suppress even the hard X-ray (2…