Search Publications
Spatial and diurnal variation of water outgassing on comet 67P/Churyumov-Gerasimenko observed from Rosetta/MIRO in August 2014
Jorda, L.; Sierks, H.; Keller, H. U. +23 more
Aims: We present the spatial and diurnal variation of water outgassing on comet 67P/Churyumov-Gerasimenko using the HO rotational transition line at 556.936 GHz observed from Rosetta/MIRO in August 2014.
Methods: The water line was analyzed with a non-LTE radiative transfer model and an optimal estimation method to retrieve the HO outgas…
Tracing the conversion of gas into stars in Young Massive Cluster Progenitors
Bastian, N.; Longmore, S. N.; Kruijssen, J. M. D. +5 more
Whilst young massive clusters (YMCs; M ≳ 104 M⊙, age ≲ 100 Myr) have been identified in significant numbers, their progenitor gas clouds have eluded detection. Recently, four extreme molecular clouds residing within 200 pc of the Galactic Centre have been identified as having the properties thought necessary to form YMCs. Her…
The Formation of IRIS Diagnostics. V. A Quintessential Model Atom of C II and General Formation Properties of the C II Lines at 133.5 nm
Carlsson, Mats; Rathore, Bhavna
The C ii 133.5 {nm} lines are important observables for the NASA/SMEX mission Interface Region Imaging Spectrograph. To make three-dimensional (3D) non-LTE radiative transfer computationally feasible, it is crucial to have a model atom with as few levels as possible while retaining the main physical processes. We here develop such a model atom and…
The origin of ultrafast outflows in AGN: Monte Carlo simulations of the wind in PDS 456
Done, Chris; Gandhi, Poshak; Takahashi, Tadayuki +4 more
Ultrafast outflows (UFOs) are seen in many AGN, giving a possible mode for AGN feedback on to the host galaxy. However, the mechanism(s) for the launch and acceleration of these outflows are currently unknown, with UV line driving apparently strongly disfavoured as the material along the line of sight is so highly ionized that it has no UV transit…
Magnetic Untwisting in Solar Jets that Go into the Outer Corona in Polar Coronal Holes
Moore, Ronald L.; Sterling, Alphonse C.; Falconer, David A.
We study 14 large solar jets observed in polar coronal holes. In EUV movies from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), each jet appears similar to most X-ray jets and EUV jets that erupt in coronal holes; but each is exceptional in that it goes higher than most, so high that it is observed in the outer corona beyond 2.…
Cool dust heating and temperature mixing in nearby star-forming galaxies
Helou, G.; Boquien, M.; Bianchi, S. +20 more
Physical conditions of the interstellar medium in galaxies are closely linked to the ambient radiation field and the heating of dust grains. In order to characterize dust properties in galaxies over a wide range of physical conditions, we present here the radial surface brightness profiles of the entire sample of 61 galaxies from Key Insights into…
The Absence of an Environmental Dependence in the Mass-Metallicity Relation at z = 2
Kewley, Lisa J.; Kacprzak, Glenn G.; Glazebrook, Karl +10 more
We investigate the environmental dependence of the mass-metallicity relation at z = 2 with MOSFIRE/Keck as part of the ZFIRE survey. Here, we present the chemical abundance of a Virgo-like progenitor at z = 2.095 that has an established red sequence. We identified 43 cluster (< z> =2.095+/- 0.004) and 74 field galaxies (< z> =2.195+/- …
SN 2009ip at late times - an interacting transient at +2 years
Gilmore, Gerard; Fraser, Morgan; Elias-Rosa, Nancy +31 more
We present photometric and spectroscopic observations of the interacting transient SN 2009ip taken during the 2013 and 2014 observing seasons. We characterize the photometric evolution as a steady and smooth decline in all bands, with a decline rate that is slower than expected for a solely 56Co-powered supernova at late phases. No furt…
VIRTIS emissivity of Alpha Regio, Venus, with implications for tessera composition
Gilmore, Martha S.; Helbert, Jörn; Mueller, Nils
The composition of Venus tessera terrain is unknown. The Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) aboard Venus Express (VEx) collects data that yields the surface emissivity at ∼1 µm, which contains information convolving a number of surface properties, including composition. We examine the variation of emissivity in the vi…
[O I] 63 µm Jets in Class 0 Sources Detected By Herschel
Eislöffel, J.; Codella, C.; van Dishoeck, E. F. +9 more
We present Herschel PACS mapping observations of the [O i] 63 µm line toward protostellar outflows in the L1448, NGC 1333-IRAS4, HH 46, BHR 71, and VLA 1623 star-forming regions. We detect emission spatially resolved along the outflow direction, which can be associated with a low-excitation atomic jet. In the L1448-C, HH 46 IRS, and BHR 71 I…