Search Publications
Kepler-1656b: A Dense Sub-Saturn with an Extreme Eccentricity
Knutson, Heather A.; Fulton, Benjamin J.; Hirsch, Lea A. +6 more
Kepler-1656b is a 5 {R}\oplus planet with an orbital period of 32 days initially detected by the prime Kepler mission. We obtained precision radial velocities of Kepler-1656 with Keck/HIRES in order to confirm the planet and to characterize its mass and orbital eccentricity. With a mass of 48 ± 4 {M}\oplus , Kepler-1656b is …
Molecular gas in two companion cluster galaxies at z = 1.2
Pannella, M.; Andreon, S.; Heywood, I. +8 more
Context. Probing both star formation history and evolution of distant cluster galaxies is essential to evaluate the effect of dense environment on shaping the galaxy properties we observe today.
Aims: We investigate the effect of cluster environment on the processing of the molecular gas in distant cluster galaxies. We study the molecular gas…
Investigating Galactic Supernova Remnant Candidates Using LOFAR
Gelfand, Joseph D.; Vink, Jacco; Hessels, Jason W. T. +3 more
We investigate six supernova remnant (SNR) candidates—G51.21+0.11, G52.37-0.70, G53.07+0.49, G53.41+0.03, G53.84-0.75, and the possible shell around G54.1+0.3—in the Galactic plane using newly acquired Low-Frequency Array High-band Antenna observations, as well as archival Westerbork Synthesis Radio Telescope and Very Large Array Galactic Plane Su…
Observing and Modeling the Gamma-Ray Emission from Pulsar/Pulsar Wind Nebula Complex PSR J0205+6449/3C 58
Torres, Diego F.; Li, Jian; Kerr, Matthew +4 more
We present the results of the analysis of eight years of Fermi-LAT data of the pulsar/pulsar wind nebula complex PSR J0205+6449/3C 58. Using a contemporaneous ephemeris, we carried out a detailed analysis of PSR J0205+6449 both during its off-peak and on-peak phase intervals. 3C 58 is significantly detected during the off-peak phase interval. We s…
The parsec-scale relationship between ICO and AV in local molecular clouds
Bolatto, Alberto D.; Leroy, Adam K.; Glover, Simon C. O. +4 more
We measure the parsec-scale relationship between integrated CO intensity (ICO) and visual extinction (AV) in 24 local molecular clouds using maps of CO emission and dust optical depth from Planck. This relationship informs our understanding of CO emission across environments, but clean Milky Way measurements remain scarce. We…
The X-Ray Luminosity Function of Ultraluminous X-Ray Sources in Collisional Ring Galaxies
Wolter, Anna; Mapelli, Michela; Fruscione, Antonella
Ring galaxies are fascinating laboratories: a catastrophic impact between two galaxies (one not much smaller than the other) has produced fireworks, especially in the larger one, when hit roughly perpendicularly to the plane. We analyze the point sources produced by the starburst episode following the impact in the rings of seven galaxies and dete…
Electron Distributions in Kinetic Scale Field Line Resonances: A Comparison of Simulations and Observations
Hull, A. J.; Chaston, C. C.; Johnson, J. R. +1 more
Observations in kinetic scale field line resonances, or eigenmodes of the geomagnetic field, reveal highly field-aligned plateaued electron distributions. By combining observations from the Van Allen Probes and Cluster spacecraft with a hybrid kinetic gyrofluid simulation we show how these distributions arise from the nonlocal self-consistent inte…
The Orbit of the Close Companion of Polaris: Hubble Space Telescope Imaging, 2007 to 2014
Mack, Jennifer; Schaefer, Gail H.; Nelan, Edmund P. +6 more
As part of a program to determine the dynamical masses of Cepheids, we have imaged the nearest and brightest Cepheid, Polaris, with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 and Wide Field Camera 3. Observations were obtained at three epochs between 2007 and 2014. In these images, as in HST frames obtained in 2005 and 2006, wh…
Serendipitous discovery of quadruply imaged quasars: two diamonds
Schechter, Paul L.; Anguita, T.; Lucey, John R. +1 more
Gravitationally lensed quasars are powerful and versatile astrophysical tools, but they are challengingly rare. In particular, only ∼25 well-characterized quadruple systems are known to date. To refine the target catalogue for the forthcoming Taipan Galaxy Survey, the images of a large number of sources are being visually inspected in order to ide…
Charge exchange in galaxy clusters
Raassen, A. J. J.; Gu, Liyi; Mao, Junjie +3 more
Context. Though theoretically expected, the charge exchange emission from galaxy clusters has never been confidently detected. Accumulating hints were reported recently, including a rather marginal detection with the Hitomi data of the Perseus cluster. As previously suggested, a detection of charge exchange line emission from galaxy clusters would…