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GREAT confirms transient nature of the circum-nuclear disk
Martín-Pintado, J.; Harris, A. I.; Stutzki, J. +6 more
We report SOFIA/GREAT, Herschel/HIFI, and ground-based velocity-resolved spectroscopy of carbon monoxide (CO) rotational transitions from J = 2-1 to J = 16-15 toward two positions in the circum-nuclear disk (CND) in our Galactic center. Radiative transfer models were used to derive information on the physical state of the gas traced by CO. The exc…
Red and Dead: The Progenitor of SN 2012aw in M95
Sollerman, J.; Inserra, C.; Smartt, S. J. +17 more
Core-collapse supernovae (SNe) are the spectacular finale to massive stellar evolution. In this Letter, we identify a progenitor for the nearby core-collapse SN 2012aw in both ground-based near-infrared and space-based optical pre-explosion imaging. The SN itself appears to be a normal Type II Plateau event, reaching a bolometric luminosity of 10<…
Spatially Resolved Stellar, Dust, and Gas Properties of the Post-interacting Whirlpool Galaxy System
Lebouteiller, Vianney; Wilson, Christine D.; Baes, Maarten +15 more
Using infrared imaging from the Herschel Space Observatory, observed as part of the Very Nearby Galaxies Survey, we investigate the spatially resolved dust properties of the interacting Whirlpool galaxy system (NGC 5194 and NGC 5195), on physical scales of ~1 kpc. Spectral energy distribution modeling of the new infrared images in combination with…
Hot Disks and Delayed Bar Formation
Weiner, Benjamin J.; Abraham, Roberto G.; Elmegreen, Bruce G. +4 more
We present observational evidence for the inhibition of bar formation in dispersion-dominated (dynamically hot) galaxies by studying the relationship between galactic structure and host galaxy kinematics in a sample of 257 galaxies between 0.1 < z <= 0.84 from the All-Wavelength Extended Groth Strip International Survey and the Deep Extragal…
The Submillimeter and Millimeter Excess of the Small Magellanic Cloud: Magnetic Dipole Emission from Magnetic Nanoparticles?
Hensley, Brandon; Draine, B. T.
The Small Magellanic Cloud (SMC) has surprisingly strong submillimeter- and millimeter-wavelength emission that is inconsistent with standard dust models, including those with emission from spinning dust. Here, we show that the emission from the SMC may be understood if the interstellar dust mixture includes magnetic nanoparticles, emitting magnet…
Vertical profiling of SO 2 and SO above Venus' clouds by SPICAV/SOIR solar occultations
Montmessin, Franck; Belyaev, Denis A.; Fedorova, Anna A. +6 more
New measurements of sulfur dioxide (SO 2) and monoxide (SO) in the atmosphere of Venus by SPICAV/SOIR instrument onboard Venus Express orbiter provide ample statistics to study the behavior of these gases above Venus' clouds. The instrument (a set of three spectrometers) is capable to sound atmospheric structure above the clouds in seve…
Black Hole Powered Nebulae and a Case Study of the Ultraluminous X-Ray Source IC 342 X-1
Feng, Hua; Grisé, Fabien; Kaaret, Philip +6 more
We present new radio, optical, and X-ray observations of three ultraluminous X-ray sources (ULXs) that are associated with large-scale nebulae. We report the discovery of a radio nebula associated with the ULX IC 342 X-1 using the Very Large Array (VLA). Complementary VLA observations of the nebula around Holmberg II X-1, and high-frequency Austra…
Modelling the huge, Herschel-resolved debris ring around HD 207129
Magain, P.; Krivov, A. V.; Eiroa, C. +18 more
Debris disks, which are inferred from the observed infrared excess to be ensembles of dust, rocks, and probably planetesimals, are common features of stellar systems. As the mechanisms of their formation and evolution are linked to those of planetary bodies, they provide valuable information. The few well-resolved debris disks are even more valuab…
Orion revisited. I. The massive cluster in front of the Orion nebula cluster
Bouy, H.; Alves, J.
Aims: The aim of this work is to characterize the stellar population between Earth and the Orion A molecular cloud where the well-known star formation benchmark Orion nebula cluster (ONC) is embedded.
Methods: We used the denser regions the Orion A cloud to block optical background light, effectively isolating the stellar population in f…
Interstellar H I and H2 in the Magellanic Clouds: An Expanded Sample Based on Ultraviolet Absorption-line Data
Welty, Daniel E.; Wong, Tony; Xue, Rui
We have determined column densities of H I and/or H2 for sight lines in the Magellanic Clouds from archival Hubble Space Telescope and Far-Ultraviolet Spectroscopic Explorer spectra of H I Lyα and H2 Lyman-band absorption. Together with some similar data from the literature, we now have absorption-based N(H I) and/or N(H…