Search Publications
Infrared observations of the flaring maser source G358.93-0.03. SOFIA confirms an accretion burst from a massive young stellar object
Menten, K. M.; Eislöffel, J.; Klose, S. +24 more
Context. Class II methanol masers are signposts of massive young stellar objects (MYSOs). Recent evidence shows that flares of these masers are driven by MYSO accretion bursts. Thus, maser monitoring can be used to identify such bursts which are hard to discover otherwise. Infrared observations reveal burst-induced changes in the spectral energy d…
Physics of ULIRGs with MUSE and ALMA: The PUMA project. II. Are local ULIRGs powered by AGN? The subkiloparsec view of the 220 GHz continuum
Rigopoulou, D.; Colina, L.; van der Werf, P. +11 more
We analyze new high-resolution (400 pc) ∼220 GHz continuum and CO(2-1) Atacama Large Millimeter Array (ALMA) observations of a representative sample of 23 local (z < 0.165) ultra-luminous infrared systems (ULIRGs; 34 individual nuclei) as part of the "Physics of ULIRGs with MUSE and ALMA" (PUMA) project. The deconvolved half-light radii of the …
Calibration of mid- to far-infrared spectral lines in galaxies
Spinoglio, Luigi; Mordini, Sabrina; Fernández-Ontiveros, Juan Antonio
Context. Mid- to far-infrared (IR) lines are suitable in the study of dust-obscured regions in galaxies because dust extinction strongly decreases with wavelength, and therefore IR spectroscopy allows us to explore the most hidden regions of galaxies, where heavily obscured star formation as well as accretion onto supermassive black holes at the n…
First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?
Waters, L. B. F. M.; Meisenheimer, K.; Augereau, J. -C. +58 more
Context. Carbon is one of the most abundant components in the Universe. While silicates have been the main focus of solid phase studies in protoplanetary discs (PPDs), little is known about the solid carbon content especially in the planet-forming regions (~0.1-10 au). Fortunately, several refractory carbonaceous species present C-H bonds (such as…
Multifrequency high spectral resolution observations of HCN toward the circumstellar envelope of Y Canum Venaticorum
Santander-García, M.; Cernicharo, J.; Greathouse, T. K. +7 more
High spectral resolution observations toward the low mass-loss rate C-rich, J-type asymptotic giant branch (AGB) star Y CVn were carried out at 7.5, 13.1, and 14.0 µm with the Echelon-cross-echelle Spectrograph mounted on the Stratospheric Observatory for Infrared Astronomy and the Texas Echelon-cross-echelle Spectrograph on the Infrared Tel…
Distribution of ionized, atomic, and PDR gas around S 1 in ρ Ophiuchus
Güsten, R.; Riquelme, D.; Mookerjea, B. +5 more
The early B star S 1 in the ρ Ophiuchus cloud excites an H II region and illuminates a large egg-shaped photon-dominated (PDR) cavity. The PDR is restricted to the west and southwest by the dense molecular ρ Oph A ridge, expanding more freely into the diffuse low-density cloud to the northeast. We analyzed new SOFIA GREAT, GMRT, and APEX data toge…
Spatial distribution of the aromatic and aliphatic carbonaceous nanograin features in the protoplanetary disk around HD 100546
Pantin, E.; Ysard, N.; Habart, E. +4 more
Context. Carbonaceous nanograins are present at the surface of protoplanetary disks around Herbig Ae/Be stars, where most of the ultraviolet energy from the central star is dissipated. Efficiently coupled to the gas, they are unavoidable to understand the physics and chemistry of these disks. Furthermore, nanograins are able to trace the outer fla…
New mid-infrared imaging constraints on companions and protoplanetary disks around six young stars
Waters, L. B. F. M.; Kamp, I.; Quanz, S. P. +13 more
Context. Mid-infrared (mid-IR) imaging traces the sub-micron and micron-sized dust grains in protoplanetary disks and it offers constraints on the geometrical properties of the disks and potential companions, particularly if those companions have circumplanetary disks.
Aims: We use the VISIR instrument and its upgrade NEAR on the VLT to take …
Morphological study of the nested planetary nebula Hubble 12
Zhang, Yong; Sadjadi, SeyedAbdolreza; Hsia, Chih-Hao +3 more
We present a visible-infrared imaging study of young planetary nebula (PN) Hubble 12 (Hb 12; PN G111.8-02.8) obtained with Hubble Space Telescope (HST) archival data and our own Canada-France-Hawaii Telescope (CFHT) measurements. Deep HST and CFHT observations of this nebula reveal three pairs of bipolar structures and an arc-shaped filament near …
Effects of anisotropy on absorption cross-section spectra of medium-sized spheroidal corundum particles
Mutschke, H.; Höfer, S.; Mayerhöfer, Th. G.
Context. It has been widely accepted that corundum particles condense in the atmospheres of oxygen-rich asymptotic giant branch stars and effectively produce an infrared emission feature at 13 µm. Laboratory experiments have predicted that these particles have the shape of oblate spheroids.
Aims: We investigate the influence of the mate…