Search Publications
The Reverberation Lag in the Low-mass X-ray Binary H1743-322
Ponti, Gabriele; De Marco, Barbara
The evolution of the inner accretion flow of a black hole X-ray binary during an outburst is still a matter of active research. X-ray reverberation lags are powerful tools for constraining disk-corona geometry. We present a study of X-ray lags in the black hole transient H1743-322. We compared the results obtained from analysis of all the publicly…
Two Eclipsing Ultraluminous X-Ray Sources in M51
Soria, R.; Urquhart, R.
We present the discovery, from archival Chandra and XMM-Newton data, of X-ray eclipses in two ultraluminous X-ray sources (ULXs), located in the same region of the galaxy M51: CXOM51 J132940.0+471237 (ULX-1, for simplicity) and CXOM51 J132939.5+471244 (ULX-2). Three eclipses were detected for ULX-1 and two for ULX-2. The presence of eclipses puts …
Using ForeCAT Deflections and Rotations to Constrain the Early Evolution of CMEs
Vourlidas, A.; Kay, C.; Opher, M. +1 more
To accurately predict the space weather effects of the impacts of coronal mass ejection (CME) at Earth one must know if and when a CME will impact Earth and the CME parameters upon impact. In 2015 Kay et al. presented Forecasting a CME’s Altered Trajectory (ForeCAT), a model for CME deflections based on the magnetic forces from the background sola…
Chain Reconnections Observed in Sympathetic Eruptions
Joshi, Navin Chandra; Magara, Tetsuya; Aulanier, Guillaume +2 more
The nature of various plausible causal links between sympathetic events is still a controversial issue. In this work, we present multiwavelength observations of sympathetic eruptions, associated flares, and coronal mass ejections (CMEs) occurring on 2013 November 17 in two close active regions. Two filaments, I.e., F1 and F2, are observed in betwe…
The Milky Way's Hot Gas Kinematics: Signatures in Current and Future OVII Absorption Line Observations
Bregman, Joel N.; Miller, Matthew J.; Hodges-Kluck, Edmund J.
Detections of z ≈ 0 oxygen absorption and emission lines indicate the Milky Way hosts a hot (∼ {10}6 K), low-density plasma extending ≳ 50 {{kpc}} into the Mily Way’s halo. Current X-ray telescopes cannot resolve the line profiles, but the variation of their strengths on the sky constrains the radial gas distribution. Interpreting the O…
Tracing the Lowest Propeller Line in Magellanic High-mass X-Ray Binaries
Laycock, Silas G. T.; Christodoulou, Dimitris M.; Yang, Jun +1 more
We have combined the published observations of high-mass X-ray binary (HMXB) pulsars in the Magellanic Clouds with a new processing of the complete archival data sets from the XMM-Newton and Chandra observatories in an attempt to trace the lowest propeller line below which accretion to polar caps is inhibited by the centrifugal force and the pulsa…
Transition Region and Chromospheric Signatures of Impulsive Heating Events. II. Modeling
Warren, Harry P.; Crump, Nicholas A.; Reep, Jeffrey W. +1 more
Results from the Solar Maximum Mission showed a close connection between the hard X-ray (HXR) and transition region (TR) emission in solar flares. Analogously, the modern combination of RHESSI and IRIS data can inform the details of heating processes in ways that were never before possible. We study a small event that was observed with RHESSI, IRI…
A Cold Flare with Delayed Heating
Fleishman, Gregory D.; Lysenko, Alexandra L.; Pal'shin, Valentin D. +3 more
Recently, a number of peculiar flares have been reported that demonstrate significant nonthermal particle signatures with low, if any, thermal emission, which implies a close association of the observed emission with the primary energy release/electron acceleration region. This paper presents a flare that appears “cold” at the impulsive phase, whi…
Origin of the Galactic Diffuse X-Ray Emission: Iron K-shell Line Diagnostics
Koyama, Katsuji; Nobukawa, Masayoshi; Uchiyama, Hideki +2 more
This paper reports detailed K-shell line profiles of iron (Fe) and nickel (Ni) of the Galactic Center X-ray Emission (GCXE), Galactic Bulge X-ray Emission (GBXE), Galactic Ridge X-ray Emission (GRXE), magnetic Cataclysmic Variables (mCVs), non-magnetic Cataclysmic Variables (non-mCVs), and coronally Active Binaries (ABs). For the study of the orig…
UV to IR Luminosities and Dust Attenuation Determined from ~4000 K-selected Galaxies at 1 < z < 3 in the ZFOURGE Survey
Papovich, Casey; Dickinson, Mark; Inami, Hanae +22 more
We build a set of composite galaxy spectral energy distributions (SEDs) by de-redshifting and scaling multi-wavelength photometry from galaxies in the ZFOURGE survey, covering the CDFS, COSMOS, and UDS fields. From a sample of ∼4000 Ks-band selected galaxies, we define 38 composite galaxy SEDs that yield continuous low-resolution spectr…