Search Publications
Sulphur-bearing molecules in AGB stars. I. The occurrence of hydrogen sulphide
Olofsson, H.; Decin, L.; De Beck, E. +4 more
Context. Sulphur is a relatively abundant element in the local Galaxy that is known to form a variety of molecules in the circumstellar envelopes of AGB stars. The abundances of these molecules vary based on the chemical types and mass-loss rates of AGB stars.
Aims: Through a survey of (sub-)millimetre emission lines of various sulphur-bearin…
The Dense Molecular Gas and Nuclear Activity in the ULIRG IRAS 13120-5453
Treister, E.; Armus, L.; van der Werf, P. +12 more
We present new Atacama Large Millimeter/submillimeter Array Band 7 (∼340 GHz) observations of the dense gas tracers HCN, HCO+, and CS in the local, single-nucleus, ultraluminous infrared galaxy IRAS 13120-5453. We find centrally enhanced HCN (4-3) emission, relative to HCO+ (4-3), but do not find evidence for radiative pumpin…
Hard X-Ray-selected AGNs in Low-mass Galaxies from the NuSTAR Serendipitous Survey
Harrison, F. A.; Stern, D.; Alexander, D. M. +14 more
We present a sample of 10 low-mass active galactic nuclei (AGNs) selected from the 40-month Nuclear Spectroscopic Telescope Array (NuSTAR) serendipitous survey. The sample is selected to have robust NuSTAR detections at 3{--}24 {keV}, to be at z< 0.3, and to have optical r-band magnitudes at least 0.5 mag fainter than an {L}\star ga…
The Plasma Parameters and Geometry of Cool and Warm Active Region Loops
Fu, Hui; Madjarska, Maria S.; Li, Bo +5 more
How the solar corona is heated to high temperatures remains an unsolved mystery in solar physics. In the present study we analyze observations of 50 whole active region loops taken with the Extreme-ultraviolet Imaging Spectrometer on board the Hinode satellite. Eleven loops were classified as cool loops (<1 MK) and 39 as warm loops (1-2 MK). We…
Approaching hell's kitchen: Molecular daredevil clouds in the vicinity of Sagittarius A*
Eckart, Andreas; Moser, Lydia; García-Marin, Macarena +9 more
We report serendipitous detections of line emission with the Atacama Large Millimeter/submillimeter Array (ALMA) in bands 3, 6, and 7 in the central parsec down to within 1'' around Sgr A* at an up to now highest resolution (<0.5'') view of the Galactic center (GC) in the submillimeter (sub-mm) domain. From the 100 GHz continuum and the H39α em…
A stellar census of the nearby, young 32 Orionis group
Murphy, Simon J.; Mamajek, Eric E.; Bell, Cameron P. M.
The 32 Orionis group was discovered almost a decade ago and despite the fact that it represents the first northern, young (age ∼ 25 Myr) stellar aggregate within 100 pc of the Sun (d ≃ 93 pc), a comprehensive survey for members and detailed characterization of the group has yet to be performed. We present the first large-scale spectroscopic survey…
A remarkably large depleted core in the Abell 2029 BCG IC 1101
Graham, Alister W.; Knapen, Johan H.; Dullo, Bililign T.
We report the discovery of an extremely large (Rb ∼2.77 arcsec ≈ 4.2 kpc) core in the brightest cluster galaxy, IC 1101, of the rich galaxy cluster Abell 2029. Luminous core-Sérsic galaxies contain depleted cores - with sizes (Rb) typically 20-500 pc - that are thought to be formed by coalescing black hole binaries. We fit a …
Aeronomy of the Venus Upper Atmosphere
Pätzold, M.; López-Valverde, M. A.; Drossart, P. +3 more
We present aeronomical observations collected using remote sensing instruments on board Venus Express, complemented with ground-based observations and numerical modeling. They are mostly based on VIRTIS and SPICAV measurements of airglow obtained in the nadir mode and at the limb above 90 km. They complement our understanding of the behavior of Ve…
VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35
Rodighiero, G.; Ivison, R. J.; Cooray, A. +24 more
We present an extragalactic survey using observations from the Atacama Large Millimeter/submillimeter Array (ALMA) to characterize galaxy populations up to z = 0.35: the Valparaíso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1-0) observations to study the molecular gas content in a sample of 67 dusty normal star-forming galaxies selec…
Decadal timescale variability of the Enceladus plumes inferred from Cassini images
Ingersoll, Andrew P.; Ewald, Shawn P.
The brightness of the Enceladus plumes varies with position in the satellite's eccentric orbit, with altitude above the surface, and with time from one year to the next. Hedman et al. (2013, hereinafter H13) were the first to report these variations. They used data from Cassini's Visible and Infrared Mapping Spectrometer (VIMS). Here we present br…