Search Publications
Faint X-Ray Binaries and their Optical Counterparts in M31
Barmby, P.; Vulic, N.; Gallagher, S. C.
X-ray binaries (XRBs) are probes of both star formation and stellar mass, but more importantly remain one of the only direct tracers of the compact object population. To investigate the XRB population in M31, we utilized all 121 publicly available observations of M31 totalling over 1 Ms from Chandra's ACIS instrument. We studied 83 star clusters i…
Spectroscopic Study of a Dark Lane and a Cool Loop in a Solar Limb Active Region by Hinode/EIS
Moon, Y. -J.; Lee, Kyoung-Sun; Lee, Jin-Yi +1 more
We investigated a cool loop and a dark lane over a limb active region on 2007 March 14 using the Hinode/EUV Imaging Spectrometer. The cool loop is clearly seen in the spectral lines formed at the transition region temperature. The dark lane is characterized by an elongated faint structure in the coronal spectral lines and is rooted on a bright poi…
Dynamical Behavior of X-Ray Spectra from Markarian 766
Takahashi, M.; Liebmann, A. C.; Haba, Y. +3 more
Mrk 766, a bright narrow-line Seyfert 1, has been observed eight times by the XMM-Newton satellite. We carried out the analysis of the composite data from all of these observations together by applying a dynamical method. Through this analysis, we noted a longer timescale variability in addition to rapid short-time variability. This longer term va…
Herschel Photometry of Disks around Low-mass Stars in the R CrA Cloud
Henning, Thomas; Liu, Yao; Wolf, Sebastian +1 more
We report photometric results from a subset of a Herschel-PACS program to observe cool dust in disks around low-mass stars as a complement to our earlier program to measure far-infrared emission from brown dwarfs. In this latest study we observed five low-mass objects in the nearby R Corona Australis region and detected at least three at 70 µ…
Observation of High Iron Charge States at Low Energies in Solar Energetic Particle Events
Bochsler, P.; Klecker, B.; Möbius, E. +5 more
The ionic charge states of solar energetic particles (SEPs) provide direct information about the source plasma, the acceleration environment, and their transport. Recent studies report that both gradual and impulsive SEP events show mean iron charge states langQ Ferang ~ 10-14 at low energies E <= 0.1 MeV nuc-1, consistent…
Probing the Mysteries of the X-Ray Binary 4U 1210-64 with ASM, PCA, MAXI, BAT, and Suzaku
Pottschmidt, Katja; Corbet, Robin H. D.; Mukai, Koji +1 more
4U 1210-64 has been postulated to be a high-mass X-ray binary powered by the Be mechanism. X-ray observations with Suzaku, the ISS Monitor of All-sky X-ray Image (MAXI), and the Rossi X-ray Timing Explorer Proportional Counter Array (PCA) and All Sky Monitor (ASM) provide detailed temporal and spectral information on this poorly understood source.…
The Curious Morphology and Orientation of Orion Proplyd HST-10
Morris, Mark R.; Bally, John; Kassis, Marc +1 more
HST-10 is one of the largest proplyds in the Orion Nebula and is located approximately 1' SE of the Trapezium. Unlike other proplyds in Orion, however, the long-axis of HST-10 does not align with θ1 C, but is instead aligned with the rotational axis of the HST-10 disk. This cannot be easily explained using current photoevaporation model…
FUSE Observations of a Full Orbit of Scorpius X-1
Raymond, John; Boroson, Bram; Vrtilek, Saeqa Dil
We obtained UV spectra of X-ray binary Scorpius X-1 in the 900-1200 Å range with the Far Ultraviolet Spectroscopic Explorer over the full 0.79 day binary orbit. The strongest emission lines are the doublet of O VI at 1032,1038 Å and the C III complex at 1175 Å. The spectrum is affected by a multitude of narrow interstellar absorption lines, both a…
Exploring Hot Gas at Junctions of Galaxy Filaments with Suzaku
Mitsuishi, I.; Sousbie, T.; Sasaki, S. +3 more
We performed five pointing observations with Suzaku to search for hot gases associated with the junctions of galaxy filaments where no significant diffuse X-ray sources were previously detected. We discovered X-ray sources successfully in all five regions including merging groups of galaxies, Suzaku J0957+2610 and Suzaku J1134+2105, and analyzed t…
Erratum: "Suzaku Observation of the Black Hole Binary 4U 1630-47 in the Very High State" (2014, ApJ, 790, 20)
Done, Chris; Shirahata, Mai; Ueda, Yoshihiro +7 more