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Multi-wavelength de-blended Herschel view of the statistical properties of dusty star-forming galaxies across cosmic time
Béthermin, M.; Wang, L.; Michałowski, M. J. +5 more
Aims: We study the statistical properties of dusty star-forming galaxies across cosmic time, such as their number counts, luminosity functions (LF), and the dust-obscured star formation rate density (SFRD).
Methods: We used the most recent de-blended Herschel catalogue in the COSMOS field to measure the number counts and LFs at far-infra…
The AGN fuelling/feedback cycle in nearby radio galaxies - II. Kinematics of the molecular gas
Davis, Timothy A.; Bureau, Martin; Casasola, Viviana +7 more
This is the second paper of a series exploring the multicomponent (stars, warm and cold gas, and radio jets) properties of a sample of 11 nearby low-excitation radio galaxies, with the aim of better understanding the active galactic nuclei (AGN) fuelling/feedback cycle in these objects. Here, we present a study of the molecular gas kinematics of s…
HDO and SO2 thermal mapping on Venus. IV. Statistical analysis of the SO2 plumes
Encrenaz, T.; Atreya, S. K.; Bézard, B. +10 more
Since January 2012 we have been monitoring the behavior of sulfur dioxide and water on Venus, using the Texas Echelon Cross-Echelle Spectrograph (TEXES) imaging spectrometer at the NASA InfraRed Telescope Facility (IRTF, Mauna Kea Observatory). We present here the observations obtained between January 2016 and September 2018. As in the case of our…
CHANG-ES. XIII. Transport processes and the magnetic fields of NGC 4666: indication of a reversing disk magnetic field
Weżgowiec, M.; Soida, M.; Dettmar, R. -J. +10 more
Context. The observation of total and linearly polarized synchrotron radiation of spiral galaxies in the radio continuum reveals the distribution and structure of their magnetic fields. By observing these, information about the proposed dynamo processes that preserve the large-scale magnetic fields in spiral galaxies can be gained. Additionally, b…
Investigating the Transition Region Explosive Events and Their Relationship to Network Jets
Chen, Yajie; Tian, Hui; Peter, Hardi +2 more
Recent imaging observations with the Interface Region Imaging Spectrograph (IRIS) have revealed prevalent intermittent jets with apparent speeds of 80-250 km s-1 from the network lanes in the solar transition region (TR). Additionally, spectroscopic observations of the TR lines have revealed the frequent presence of highly non-Gaussian …
Four GRB supernovae at redshifts between 0.4 and 0.8. The bursts GRB 071112C, 111228A, 120714B, and 130831A
Greiner, J.; Klose, S.; Schady, P. +15 more
Twenty years ago, GRB 980425/SN 1998bw revealed that long gamma-ray bursts (GRBs) are physically associated with broad-lined type-Ic supernovae (SNe). Since then more than 1000 long GRBs have been localized to high angular precision, but only in ∼50 cases has the underlying SN component been identified. Using the Gamma-Ray Burst Optical Near-Infra…
The Impact of the Environment on the Early Stages of Radio Source Evolution
Ostorero, Luisa; Guainazzi, Matteo; Stawarz, Łukasz +4 more
Compact symmetric objects (CSOs) show radio features such as jets, lobes, and hot spots that are contained within the central 1 kpc region of their host galaxy. Thus, they are thought to be among the progenitors of large-scale radio galaxies. A debate regarding whether the CSOs are compact primarily because they are young or because they are surro…
An observational test for star formation prescriptions in cosmological hydrodynamical simulations
Buck, Tobias; Dutton, Aaron A.; Macciò, Andrea V.
State-of-the-art cosmological hydrodynamical simulations of galaxy formation have reached the point at which their outcomes result in galaxies with ever more realism. Still, the employed sub-grid models include several free parameters such as the density threshold, n, to localize the star-forming gas. In this work, we investigate the possibilities…
Runaway Young Stars near the Orion Nebula
Kounkel, Marina; McBride, Aidan
The star-forming region of the Orion Nebula (ONC) is ideal to study the stellar dynamics of young stars in a clustered environment. Using Gaia DR2 we search for pre-main sequence stars with unusually high proper motions that may be representative of a dynamical ejection from unstable young triple systems or other close three-body encounters. We id…
Revealing the Milky Way’s Hidden Circumgalactic Medium with the Cosmic Origins Spectrograph Quasar Database for Galactic Absorption Lines
Peek, J. E. G.; Zheng, Y.; Putman, M. E. +1 more
Every quasar (quasi-stellar object; QSO) spectrum contains absorption-line signatures from the interstellar medium, disk-halo interface, and circumgalactic medium (CGM) of the Milky Way (MW). We analyze Hubble Space Telescope/Cosmic Origins Spectrograph (COS) spectra of 132 QSOs to study the significance and origin of Si IV absorption at | {v}