Search Publications
Molecular Gas Along a Bright Hα Filament in 2A 0335+096 Revealed by ALMA
O'Connell, R. W.; Fabian, A. C.; Combes, F. +17 more
We present ALMA CO(1-0) and CO(3-2) observations of the brightest cluster galaxy (BCG) in the 2A 0335+096 galaxy cluster (z = 0.0346). The total molecular gas mass of 1.13 ± 0.15 × 109 M ⊙ is divided into two components: a nuclear region and a 7 kpc long dusty filament. The central molecular gas component accounts for 3.2 ± 0…
NuSTAR Resolves the First Dual AGN above 10 keV in SWIFT J2028.5+2543
Hailey, Charles J.; Lamperti, Isabella; Gandhi, Poshak +19 more
We have discovered heavy obscuration in the dual active galactic nucleus (AGN) in the Swift/Burst Alert Telescope (BAT) source SWIFT J2028.5+2543 using Nuclear Spectroscopic Telescope Array (NuSTAR). While an early XMM-Newton study suggested the emission was mainly from NGC 6921, the superior spatial resolution of NuSTAR above 10 keV resolves the …
A milestone toward understanding PDR properties in the extreme environment of LMC-30 Doradus
Lebouteiller, V.; Madden, S. C.; Galliano, F. +11 more
Context. More complete knowledge of galaxy evolution requires understanding the process of star formation and the interaction between the interstellar radiation field and interstellar medium (ISM) in galactic environments traversing a wide range of physical parameter space. We focus on the impact of massive star formation on the surrounding low me…
Magnetic field morphology in nearby molecular clouds as revealed by starlight and submillimetre polarization
Miville-Deschênes, M. -A.; Boulanger, F.; Falgarone, E. +8 more
Within four nearby (d < 160 pc) molecular clouds, we statistically evaluated the structure of the interstellar magnetic field, projected on the plane of the sky and integrated along the line of sight, as inferred from the polarized thermal emission of Galactic dust observed by Planck at 353 GHz and from the optical and near-infrared polarizatio…
The B-ring's surface mass density from hidden density waves: Less than meets the eye?
Nicholson, P. D.; Hedman, M. M.
Saturn's B ring is the most opaque ring in our Solar System, but many of its fundamental parameters, including its total mass, are not well constrained. Spiral density waves generated by mean-motion resonances with Saturn's moons provide some of the best constraints on the rings' mass density, but detecting and quantifying such waves in the B ring…
The First Spectrum of the Coldest Brown Dwarf
Fortney, Jonathan J.; Marley, Mark S.; Faherty, Jacqueline K. +6 more
The recently discovered brown dwarf WISE 0855 presents the first opportunity to directly study an object outside the solar system that is nearly as cold as our own gas giant planets. However, the traditional methodology for characterizing brown dwarfs—near-infrared spectroscopy—is not currently feasible, as WISE 0855 is too cold and faint. To char…
A Reverberation-based Black Hole Mass for MCG-06-30-15
Horne, Keith; Cackett, Edward M.; Crenshaw, D. Michael +3 more
We present the results of a reverberation campaign targeting MGC-06-30-15. Spectrophotometric monitoring and broad-band photometric monitoring over the course of four months in spring 2012 allowed a determination of a time delay in the broad Hβ emission line of τ = 5.3 ± 1.8 days in the rest frame of the active galactic nucleus (AGN). Combined wit…
Dynamical Masses of Young Stars. I. Discordant Model Ages of Upper Scorpius
Rizzuto, Aaron C.; Dupuy, Trent J.; Ireland, Michael J. +1 more
We present the results of a long-term orbit monitoring program, using sparse aperture masking observations taken with NIRC2 on the Keck-II telescope, of seven G- to M-type members of the Upper Scorpius subgroup of the Sco-Cen OB association. We present astrometry and derived orbital elements of the binary systems we have monitored, and also determ…
Comparison of Damped Oscillations in Solar and Stellar X-Ray flares
Kim, S.; Cho, K. -S.; Nakariakov, V. M. +2 more
We explore the similarity and difference of the quasi-periodic pulsations (QPPs) observed in the decay phase of solar and stellar flares at X-rays. We identified 42 solar flares with pronounced QPPs, observed with RHESSI, and 36 stellar flares with QPPs, observed with XMM-Newton. The empirical mode decomposition (EMD) method and least-squares fit …
Hubble Tarantula Treasury Project - IV. The extinction law
Anderson, Jay; Grebel, Eva K.; Aloisi, Alessandra +10 more
We report on the study of interstellar extinction across the Tarantula Nebula (30 Doradus), in the Large Magellanic Cloud, using observations from the Hubble Tarantula Treasury Project in the 0.3-1.6 µm range. The considerable and patchy extinction inside the nebula causes about 3500 red clump stars to be scattered along the reddening vector…