Search Publications
Hard X-Ray Emission from Sh 2-104: A NuSTAR Search for Gamma-Ray Counterparts
Harrison, F. A.; Stern, D.; Zhang, W. W. +11 more
We present NuSTAR hard X-ray observations of Sh 2-104, a compact H II region containing several young massive stellar clusters (YMSCs). We have detected distinct hard X-ray sources coincident with localized VERITAS TeV emission recently resolved from the giant gamma-ray complex MGRO J2019+37 in the Cygnus region. Fainter, diffuse X-rays coincident…
Searching for narrow absorption and emission lines in XMM-Newton spectra of gamma-ray bursts
D'Avanzo, P.; Campana, S.; Tagliaferri, G. +7 more
We present the results of a spectroscopic search for narrow emission and absorption features in the X-ray spectra of long gamma-ray burst (GRB) afterglows. Using XMM-Newton data, both EPIC and RGS spectra, of six bright (fluence > 10-7 erg cm-2) and relatively nearby (z = 0.54-1.41) GRBs, we performed a blind search for em…
Dealing with missing data in the MICROSCOPE space mission: An adaptation of inpainting to handle colored-noise data
Bergé, Joel; Métris, Gilles; Touboul, Pierre +2 more
The MICROSCOPE space mission, launched on April 25, 2016, aims to test the weak equivalence principle (WEP) with a 10-15 precision. Reaching this performance requires an accurate and robust data analysis method, especially since the possible WEP violation signal will be dominated by a strongly colored noise. An important complication is…
Envelope overshooting in low-metallicity intermediate- and high-mass stars: a test with the Sagittarius dwarf irregular galaxy
Slemer, Alessandra; Marigo, Paola; Bianchi, Luciana +5 more
We check the performance of the Padova TRieste Stellar Evolution Code (PARSEC) tracks in reproducing the blue loops of intermediate age and young stellar populations at very low metallicity. We compute new evolutionary PARSEC tracks of intermediate- and high-mass stars from 2 to 350 M⊙ with enhanced envelope overshooting (EO), EO = 2H
Seasonal variation of Titan's haze at low and high altitudes from HST-STIS spectroscopy
Karkoschka, Erich
The Space Telescope Imaging Spectrograph accumulated image cubes of Titan in five years between 1997 and 2004 that we calibrated and analyzed. The observations probe Titan's early northern fall to early winter. Methane bands between 543 and 990 nm wavelength are well resolved spectrally, and Titan's latitudinal and center-to-limb reflectivity vari…
Coronal electron density distributions estimated from CMEs, DH type II radio bursts, and polarized brightness measurements
Moon, Y. -J.; Lee, Kyoung-Sun; Kim, R. -S. +2 more
We determine coronal electron density distributions (CEDDs) by analyzing decahectometric (DH) type II observations under two assumptions. DH type II bursts are generated by either (1) shocks at the leading edges of coronal mass ejections (CMEs) or (2) CME shock-streamer interactions. Among 399 Wind/WAVES type II bursts (from 1997 to 2012) associat…
Equatorial noise emissions with a quasiperiodic modulation observed by DEMETER at harmonics of the O+ ion gyrofrequency
Němec, František; Santolík, Ondřej; Cornilleau-Wehrlin, Nicole +1 more
The analysis of ionospheric equatorial noise (EN) with a quasiperiodic (QP) modulation observed by the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) spacecraft is presented. These EN emissions, also called whistler mode or fast magnetosonic waves, play an important role in acceleration of radiation belt elec…
Simple brane-world inflationary models — An update
Okada, Nobuchika; Okada, Satomi
In the light of the Planck 2015 results, we update simple inflationary models based on the quadratic, quartic, Higgs and Coleman-Weinberg potentials in the context of the Randall-Sundrum brane-world cosmology. Brane-world cosmological effect alters the inflationary predictions of the spectral index (ns) and the tensor-to-scalar ratio (r) from thos…
Energetic ions scattered into the loss cone with observations of the Cluster satellite
Yuan, Zhigang; Xiong, Ying; Wang, Jingfang
In this paper, we report in situ observations by the Cluster spacecraft of energetic ions scattered into the loss cone during the inbound pass from the plasma sheet into the plasmasphere. During the inbound pass of the plasma sheet, Cluster observed the isotropy ratio of energetic ions to gradually decrease from unity and the isotropic boundary ex…
On the Bright Loop Top Emission in Post-eruption Arcades
Isobe, Hiroaki; Tripathi, Durgesh; Ghosh, Avyarthana +1 more
Observations of post-eruption arcades (PEAs) in X-rays and EUV reveal strong localized brightenings at the loop top regions. The origins of these brightenings and their dynamics are not well understood to date. Here, we study the dynamics of PEAs using one-dimensional hydrodynamic modeling, focusing on understanding the formation of localized brig…