Search Publications
Resolved Star Formation Efficiency in the Antennae Galaxies
Leroy, Adam K.; Whitmore, Bradley C.; Johnson, Kelsey E. +3 more
We use Atacama Large Millimeter Array CO(3-2) observations in conjunction with optical observations from the Hubble Space Telescope to determine the ratio of stellar to gas mass for regions in the Antennae Galaxies. We adopt the term “instantaneous mass ratio” {IMR}(t)={M}stars}/({M}gas}+{M}stars}), which is equiva…
Predicting the COSIE-C Signal from the Outer Corona up to 3 Solar Radii
Telloni, Daniele; Andretta, Vincenzo; Del Zanna, Giulio +2 more
We present estimates of the signal to be expected in quiescent solar conditions, as would be obtained with the COronal Spectrographic Imager in the EUV in its coronagraphic mode (COSIE-C). COSIE-C has been proposed to routinely observe the relatively unexplored outer corona, where we know that many fundamental processes affecting both the lower co…
Objective Lagrangian Vortex Detection in the Solar Photosphere
Silva, Suzana S. A.; Requerey, Iker S.; Rempel, Erico Luiz +2 more
Vortices in the solar photosphere can be linked to a wide range of events, such as small-scale solar eruptions, wave excitation, and heating of the upper part of the solar atmosphere. Despite their importance in solar physics, most of the current studies on photospheric vortices are based on methods that are not invariant under time-dependent tran…
A Two-dimensional Spectroscopic Study of Emission-line Galaxies in the Faint Infrared Grism Survey (FIGS). I. Detection Method and Catalog
Finkelstein, Steven L.; Hathi, Nimish P.; Koekemoer, Anton M. +31 more
We present the results from the application of a two-dimensional emission line detection method, EMission-line two-Dimensional (EM2D), to the near-infrared G102 grism observations obtained with the Wide-Field Camera 3 (WFC3) as part of the Cycle 22 Hubble Space Telescope Treasury Program: the Faint Infrared Grism Survey (FIGS). Using the EM2D meth…
IN-SYNC. VIII. Primordial Disk Frequencies in NGC 1333, IC 348, and the Orion A Molecular Cloud
Da Rio, Nicola; Meyer, Michael R.; Yao, Yuhan +2 more
In this paper, we address two issues related to primordial disk evolution in three clusters (NGC 1333, IC 348, and Orion A) observed by the INfrared Spectra of Young Nebulous Clusters (IN-SYNC) project. First, in each cluster, averaged over the spread of age, we investigate how disk lifetime is dependent on stellar mass. The general relation in IC…
Discovery of Extended Infrared Emission around the Neutron Star RXJ0806.4-4123
Luhman, K. L.; Pavlov, G. G.; Williams, C. C. +3 more
Following up on a faint detection of a near-infrared (NIR) source at the position of the X-ray thermal isolated neutron star RX J0806.4-4123, we present new Hubble Space Telescope observations in the H-band. The NIR source is unambiguously detected with a Vega magnitude of 23.7 ± 0.2 (flux density of 0.40 ± 0.06 µJy at λ = 1.54 µm). Th…
Evidence of Twisting and Mixed-polarity Solar Photospheric Magnetic Field in Large Penumbral Jets: IRIS and Hinode Observations
Tiwari, Sanjiv K.; Winebarger, Amy R.; De Pontieu, Bart +4 more
A recent study using Hinode (Solar Optical Telescope/Filtergraph [SOT/FG]) data of a sunspot revealed some unusually large penumbral jets that often repeatedly occurred at the same locations in the penumbra, namely, at the tail of a penumbral filament or where the tails of multiple penumbral filaments converged. These locations had obvious photosp…
Black Holes and Neutron Stars in Nearby Galaxies: Insights from NuSTAR
Wik, D. R.; Lehmer, B. D.; Hornschemeier, A. E. +8 more
Nearby galaxy surveys have long classified X-ray binaries (XRBs) by the mass category of their donor stars (high-mass and low-mass). The NuSTAR observatory, which provides imaging data at E > 10 keV, has enabled the classification of extragalactic XRBs by their compact object type: neutron star (NS) or black hole (BH). We analyzed NuSTAR/Chandr…
2004 EW95: A Phyllosilicate-bearing Carbonaceous Asteroid in the Kuiper Belt
Fraser, Wesley C.; Brown, Michael E.; Puzia, Thomas H. +2 more
Models of the Solar System’s dynamical evolution predict the dispersal of primitive planetesimals from their formative regions among the gas-giant planets due to the early phases of planetary migration. Consequently, carbonaceous objects were scattered both into the outer asteroid belt and out to the Kuiper Belt. These models predict that the Kuip…
HST/GHRS Observations of Cool, Low-gravity Stars. VI. Mass-loss Rates and Wind Parameters for M Giants
Carpenter, Kenneth G.; Nielsen, Krister E.; Rau, Gioia +1 more
The photon-scattering winds of M giants absorb parts of the chromospheric emission lines and produce self-reversed spectral features in high-resolution Hubble Space Telescope (HST)/GHRS spectra. These spectra provide an opportunity to assess fundamental parameters of the wind, including flow and turbulent velocities, the optical depth of the wind …