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A Face-on Accretion System in High-mass Star Formation: Possible Dusty Infall Streams within 100 AU
Hirota, Tomoya; Honma, Mareki; Sorai, Kazuo +7 more
We report on interferometric observations of a face-on accretion system around the high-mass young stellar object, G353.273+0.641. The innermost accretion system of 100 au radius was resolved in a 45 GHz continuum image taken with the Jansky-Very Large Array. Our spectral energy distribution analysis indicated that the continuum could be explained…
Discovery of a Lensed Ultrabright Submillimeter Galaxy at z = 2.0439
Rebolo, R.; Dannerbauer, H.; Díaz-Sánchez, A. +1 more
We report an ultrabright lensed submillimeter galaxy (SMG) at z = 2.0439, WISE J132934.18+224327.3, identified as a result of a full-sky cross-correlation of the AllWISE and Planck compact source catalogs aimed to search for bright analogs of the SMG SMM J2135, the Cosmic Eyelash. Inspection of archival SCUBA-2 observations of the candidates revea…
Structure and dynamics of the molecular gas in M 2-9: a follow-up study with ALMA
Sánchez Contreras, C.; Alcolea, J.; Santander-García, M. +4 more
Context. M 2-9 is a young planetary nebula (PN) that shows the characteristics of its last ejections in unprecedented detail. These last ejections are thought to trigger the post-asymptotic giant branch evolution.
Aims: To assemble an overall picture of how M 2-9 was shaped, we analyzed the characteristics of the different molecular gas compo…
Crossing the Eddington Limit: Examining Disk Spectra at High Accretion Rates
Done, Chris; Soria, Roberto; Swartz, Douglas A. +3 more
The faintest ultraluminous X-ray sources (ULXs), those with 0.3-10 keV luminosities 1< {L}{{X}}/{10}39< 3 {erg} {{{s}}}-1, tend to have X-ray spectra that are disk-like but broader than expected for thin accretion disks. These “broadened disk (BD)” spectra are thought to indicate near- or mildly super-Eddingt…
Circumnuclear Structures in Megamaser Host Galaxies
Greene, Jenny E.; Seth, Anil C.; Henkel, Christian +4 more
Using the Hubble Space Telescope, we identify circumnuclear (100-500 pc scale) structures in nine new H2O megamaser host galaxies to understand the flow of matter from kpc-scale galactic structures down to the supermassive black holes (SMBHs) at galactic centers. We double the sample analyzed in a similar way by Greene et al. and consid…
Interferometric evidence for quantum heated particles in the inner region of protoplanetary disks around Herbig stars
Waters, L. B. F. M.; Dominik, C.; Benisty, M. +6 more
Context. To understand the chemical composition of planets, it is important to know the chemical composition of the region where they form in protoplanetary disks. Because of its fundamental role in chemical and biological processes, carbon is a key element to trace.
Aims: We identify the carriers and processes behind the extended near-infrar…
A Large-scale Plume in an X-class Solar Flare
Fleishman, Gregory D.; Nita, Gelu M.; Gary, Dale E.
Ever-increasing multi-frequency imaging of solar observations suggests that solar flares often involve more than one magnetic fluxtube. Some of the fluxtubes are closed, while others can contain open fields. The relative proportion of nonthermal electrons among those distinct loops is highly important for understanding energy release, particle acc…
Dynamics of non-spherical dust in the coma of 67P/Churyumov- Gerasimenko constrained by GIADA and ROSINA data
Fulle, M.; Bieler, A.; Fougere, N. +6 more
Among the comet 67P/Churyumov-Gerasimenko (67P/C-G) in situ measurements, the closest that have ever been performed at a comet nucleus, are also those of speed, mass, and cross-section of cometary grains performed by the Grain Impact Analyser and Dust Accumulator (GIADA) instrument. To interpret GIADA data, we performed dust dynamical numerical si…
The Life Cycle of Active Region Magnetic Fields
Cheung, M. C. M.; van Driel-Gesztelyi, L.; Martínez Pillet, V. +1 more
We present a contemporary view of how solar active region magnetic fields are understood to be generated, transported and dispersed. Empirical trends of active region properties that guide model development are discussed. Physical principles considered important for active region evolution are introduced and advances in modeling are reviewed.
Analysis of R-band observations of an outburst of Comet 29P/Schwassmann-Wachmann 1 to place constraints on the nucleus' rotation state
Schambeau, Charles A.; Fernández, Yanga R.; Samarasinha, Nalin H. +2 more
We present analysis of five nights of R-band observations of Comet 29P/Schwassmann-Wachmann 1 (SW1) taken on September 2008 which show the comet undergoing an outburst. Coma morphology shows a projected asymmetric shell of material expanding radially and four linear features on the northern side of the coma at position angles 37°, 78°, 300°, and 3…