Search Publications
Homologous Helical Jets: Observations By IRIS, SDO, and Hinode and Magnetic Modeling With Data-Driven Simulations
Golub, L.; Tian, H.; Cheung, Mark C. M. +18 more
We report on observations of recurrent jets by instruments on board the Interface Region Imaging Spectrograph, Solar Dynamics Observatory (SDO), and Hinode spacecraft. Over a 4 hr period on 2013 July 21, recurrent coronal jets were observed to emanate from NOAA Active Region 11793. Far-ultraviolet spectra probing plasma at transition region temper…
Thin Current Sheets and Associated Electron Heating in Turbulent Space Plasma
Vaivads, A.; Sahraoui, F.; Khotyaintsev, Yu. V. +6 more
Intermittent structures, such as thin current sheets, are abundant in turbulent plasmas. Numerical simulations indicate that such current sheets are important sites of energy dissipation and particle heating occurring at kinetic scales. However, direct evidence of dissipation and associated heating within current sheets is scarce. Here, we show a …
The Star Formation Histories of Local Group Dwarf Galaxies. III. Characterizing Quenching in Low-mass Galaxies
Dolphin, Andrew E.; Skillman, Evan D.; Williams, Benjamin F. +4 more
We explore the quenching of low-mass galaxies (104 ≲ {{M}\star } ≲ 108 {{M}⊙ }) as a function of lookback time using the star formation histories (SFHs) of 38 Local Group dwarf galaxies. The SFHs were derived by analyzing color-magnitude diagrams of resolved stellar populations in archival Hubble Space T…
Velocity-resolved [CII] Emission and [CII]/FIR Mapping along Orion with Herschel
Falgarone, E.; Teyssier, D.; Ossenkopf, V. +22 more
We present the first ∼7.‧5 × 11.‧5 velocity-resolved (∼0.2 km s-1) map of the [C ii] 158 µm line toward the Orion molecular cloud 1 (OMC 1) taken with the Herschel/HIFI instrument. In combination with far-IR (FIR) photometric images and velocity-resolved maps of the H41α hydrogen recombination and CO J = 2-1 lines, this data set p…
Hops 383: an Outbursting Class 0 Protostar in Orion
Fischer, William J.; Wilson, T. L.; Watson, Dan M. +11 more
We report the dramatic mid-infrared brightening between 2004 and 2006 of Herschel Orion Protostar Survey (HOPS) 383, a deeply embedded protostar adjacent to NGC 1977 in Orion. By 2008, the source became a factor of 35 brighter at 24 µm with a brightness increase also apparent at 4.5 µm. The outburst is also detected in the submillimete…
Far-infrared Dust Temperatures and Column Densities of the MALT90 Molecular Clump Sample
Hoq, Sadia; Jackson, James M.; Sanhueza, Patricio +4 more
We present dust column densities and dust temperatures for ∼3000 young, high-mass molecular clumps from the Millimeter Astronomy Legacy Team 90 GHz survey, derived from adjusting single-temperature dust emission models to the far-infrared intensity maps measured between 160 and 870 µm from the Herschel/Herschel Infrared Galactic Plane Survey…
Zooming In on the Progenitors of Superluminous Supernovae With the HST
Berger, E.; Kirshner, R. P.; Rest, A. +25 more
We present Hubble Space Telescope (HST) rest-frame ultraviolet imaging of the host galaxies of 16 hydrogen-poor superluminous supernovae (SLSNe), including 11 events from the Pan-STARRS Medium Deep Survey. Taking advantage of the superb angular resolution of HST, we characterize the galaxies’ morphological properties, sizes, and star formation rat…
The Relation between Solar Eruption Topologies and Observed Flare Features. I. Flare Ribbons
Pariat, E.; DeLuca, E. E.; McKillop, S. +5 more
In this paper we present a topological magnetic field investigation of seven two-ribbon flares in sigmoidal active regions observed with Hinode, STEREO, and Solar Dynamics Observatory. We first derive the 3D coronal magnetic field structure of all regions using marginally unstable 3D coronal magnetic field models created with the flux rope inserti…
The Dust and Gas Content of the Crab Nebula
Barlow, M. J.; Owen, P. J.
We have constructed mocassin photoionization plus dust radiative transfer models for the Crab Nebula core-collapse supernova (CCSN) remnant, using either smooth or clumped mass distributions, in order to determine the chemical composition and masses of the nebular gas and dust. We computed models for several different geometries suggested for the …
The Stacked Thermal Sunyaev-Zel'dovich Signal of Locally Brightest Galaxies in Planck Full Mission Data: Evidence for Galaxy Feedback?
Battaglia, Nicholas; Spergel, David N.; Hill, J. Colin +1 more
We use the Planck full mission temperature maps to examine the stacked thermal Sunyaev-Zel’dovich (tSZ) signal of 188,042 “locally brightest galaxies” (LBGs) selected from the Sloan Digital Sky Survey Data Release 7. Our LBG sample closely matches that of Planck Collaboration XI (PCXI), but our analysis differs in several ways. We work directly in…