Search Publications
The discovery of the 401 Hz accreting millisecond pulsar IGR J17498-2921 in a 3.8 h orbit
Belloni, T.; Ferrigno, C.; Papitto, A. +6 more
We report on the detection of a 400.99018734(1) Hz coherent signal in the Rossi X-ray Timing Explorer (RXTE) light curves of the recently discovered X-ray transient,
Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities
Goode, P. R.; Gopalswamy, N.; Yurchyshyn, V. B. +4 more
We investigate the relationship between the monthly averaged maximal speeds of coronal mass ejections (CMEs), international sunspot number (ISSN), and the geomagnetic Dst and Ap indices covering the 1996-2008 time interval (solar cycle 23). Our new findings are as follows. (1) There is a noteworthy relationship between monthly averaged maximum CME…
Multiwavelength Observations of the Gamma-Ray Blazar PKS 0528+134 in Quiescence
Lähteenmäki, A.; Umana, G.; Lott, B. +29 more
We present multiwavelength observations of the ultraluminous blazar-type radio loud quasar PKS 0528+134 in quiescence during the period 2009 July-December. Four Target-of-Opportunity observations with the XMM-Newton satellite in the 0.2-10 keV range were supplemented with optical observations at the MDM Observatory, radio and optical data from the…
Probing Population III Stars in Galaxy IOK-1 at z = 6.96 Through He II Emission
Fan, Xiaohui; Jiang, Linhua; Cai, Zheng +7 more
The He II λ1640 emission line has been suggested as a direct probe of Population III (Pop III) stars at high redshift, since it can arise from highly energetic ionizing photons associated with hot, metal-free stars. We use the Hubble Space Telescope WFC3/F130N IR narrowband filter to probe He II λ1640 emission in galaxy IOK-1 at z = 6.96. The sens…
Forward Modeling Cavity Density: A Multi-instrument Diagnostic
Gibson, S. E.; Schmit, D. J.
The thermodynamic properties of coronal prominence cavities present a unique probe into the energy and mass budget of prominences. Using a three-dimensional morphological model, we forward model the polarization brightness and extreme-ultraviolet (EUV) emission of a cavity and its surrounding streamer. Using a genetic algorithm, we find the best-f…
Regional-scale stratigraphy of surface units in Tyrrhena and Iapygia Terrae, Mars: Insights into highland crustal evolution and alteration history
Rogers, A. Deanne; Fergason, Robin L.
The compositional, thermophysical and geologic characteristics of surface units in Iapygia and Tyrrhena Terra (60°E-100°E, 0°-30°S) provide new insights into the compositional stratigraphy of the region. Intercrater plains are dominated by two surface units. The older unit (unit 1) is deficient in olivine and more degraded and likely consists of a…
Cross Spectral Calibration of Suzaku, XMM-Newton, and Chandra with PKS 2155304 as an Activity of IACHEC
Ishida, Manabu; Tsujimoto, Masahiro; Guainazzi, Matteo +6 more
We report on comparisons of the energy responses of the Suzaku XIS, the Chandra HRC and ACIS with the LETG, and the XMM-Newton MOS and pn using simultaneous data of the BL Lac object PKS 2155
The PEP survey: clustering of infrared-selected galaxies and structure formation at z ∼ 2 in GOODS-South
Berta, S.; Magnelli, B.; Lutz, D. +23 more
This paper presents the first direct estimate of the 3D clustering properties of far-infrared sources up to z∼ 3. This has been possible thanks to the PACS Evolutionary Probe (PEP) survey of the GOODS-South field performed with the PACS instrument on board the Herschel satellite. 550 and 502 sources were detected respectively in the 100- and 160-&…
The Rest-frame Ultraviolet Light Profile Shapes of Lyα-emitting Galaxies at z = 3.1
Blanc, Guillermo A.; Gronwall, Caryl; Gawiser, Eric +4 more
We present a morphological analysis of the rest-frame ultraviolet emission of 78 resolved, high signal-to-noise z ~ 3.1 Lyα emitters (LAEs) in the Extended Chandra Deep Field-South. Using Hubble Space Telescope/Advanced Camera for Surveys V-band images taken as part of the Galaxy Evolution from Morphology and SEDs, Great Observatories Origins Deep…
Hoag's Object: evidence for cold accretion on to an elliptical galaxy
Brosch, Noah; Moiseev, Alexei; Finkelman, Ido +1 more
We present new photometric and spectroscopic observations of the famous Hoag's Object, a peculiar ring galaxy with a central roundish core. The nature of Hoag's Object is still under controversy. Previous studies demonstrated that a major accretion event that took place at least 2-3 Gyr ago can account for the observational evidence. However, the …