Search Publications
Evolution of the Solar Lyα Line Profile during the Solar Cycle
Bzowski, Maciej; Kubiak, Marzena A.; Sokół, Justyna M. +1 more
Recent studies of interstellar neutral (ISN) hydrogen observed by the Interstellar Boundary Explorer (IBEX) suggested that the present understanding of the radiation pressure acting on hydrogen atoms in the heliosphere should be revised. There is a significant discrepancy between theoretical predictions of the ISN H signal using the currently used…
Planetary Candidates from K2 Campaign 16
Henning, Thomas; Schlieder, Joshua E.; Fulton, Benjamin J. +20 more
Given that Campaign 16 of the K2 mission is one of just two K2 campaigns observed so far in “forward-facing” mode, which enables immediate follow-up observations from the ground, we present a catalog of interesting targets identified through photometry alone. Our catalog includes 30 high-quality planet candidates (showing no signs of being non-pla…
Gas Contents of Galaxy Groups from Thermal Sunyaev-Zel’dovich Effects
Wang, Huiyuan; Ma, Yin-Zhe; Yang, Xiaohu +4 more
A matched filter technique is applied to the Planck all-sky Compton y-parameter map to measure the thermal Sunyaev-Zel’dovich (tSZ) effect produced by galaxy groups of different halo masses selected from large redshift surveys in the low-z universe. Reliable halo mass estimates are available for all of the groups, which allows us to bin groups of …
Time Stamps of Vertical Phase Mixing in the Galactic Disk from LAMOST/Gaia Stars
Zhang, Yong; Tian, Hai-Jun; Wu, Yue +2 more
The perturbation mechanism of the Galactic disk is a long-standing puzzle. The imprints from perturbations provide important diagnostics concerning the disk’s formation and evolution. Here we try to constrain when the vertical perturbation took place in the disk by tracking the phase-mixing history. First, we clearly depict the spiral structures o…
Isotropy analyses of the Planck convergence map
Novaes, C. P.; Bernui, A.; Ferreira, I. S. +1 more
The presence of matter in the path of relic photons causes distortions in the angular pattern of the cosmic microwave background (CMB) temperature fluctuations, modifying their properties in a slight but measurable way. Recently, the Planck Collaboration released the estimated convergence map, an integrated measure of the large-scale matter distri…
A Short-term ESPERTA-based Forecast Tool for Moderate-to-extreme Solar Proton Events
Laurenza, M.; Cliver, E. W.; Alberti, T.
The ESPERTA (Empirical model for Solar Proton Event Real Time Alert) forecast tool has a Probability of Detection (POD) of 63% for all >10 MeV events with proton peak intensity ≥10 pfu (i.e., ≥S1 events, S1 referring to minor storms on the NOAA Solar Radiation Storms scale), from 1995 to 2014 with a false alarm rate (FAR) of 38% and a median (m…
Discovery of a z = 7.452 High Equivalent Width Lyα Emitter from the Hubble Space Telescope Faint Infrared Grism Survey
Finkelstein, Steven L.; Koekemoer, Anton M.; Larson, Rebecca L. +19 more
We present the results of an unbiased search for Lyα emission from continuum-selected 5.6 < z < 8.7 galaxies. Our data set consists of 160 orbits of G102 slitless grism spectroscopy obtained with the Hubble Space Telescope(HST)/WFC3 as part of the Faint Infrared Grism Survey (FIGS; PI: Malhotra), which obtains deep slitless spectra of all so…
The Carnegie-Chicago Hubble Program. V. The Distances to NGC 1448 and NGC 1316 via the Tip of the Red Giant Branch
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +8 more
The Carnegie-Chicago Hubble Program (CCHP) is recalibrating the extragalactic SN Ia distance scale using exclusively Population II stars. This effort focuses on the Tip of the Red Giant Branch (TRGB) method, whose systematics are entirely independent of the Population I Cepheid-based determinations that have long served as calibrators for the SN I…
Chromospheric Heating due to Cancellation of Quiet Sun Internetwork Fields
Gošić, M.; De Pontieu, B.; Bellot Rubio, L. R. +5 more
The heating of the solar chromosphere remains one of the most important questions in solar physics. Our current understanding is that small-scale internetwork (IN) magnetic fields play an important role as a heating agent. Indeed, cancellations of IN magnetic elements in the photosphere can produce transient brightenings in the chromosphere and tr…
Flux Accretion and Coronal Mass Ejection Dynamics
Welsch, Brian T.
Coronal mass ejections (CMEs) are the primary drivers of severe space weather disturbances in the heliosphere. Models of CME dynamics have been proposed that do not fully include the effects of magnetic reconnection on the forces driving the ejection. Both observations and numerical modeling, however, suggest that reconnection likely plays a major…