Search Publications
The Rhythm of Fairall 9. I. Observing the Spectral Variability with XMM-Newton and NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +13 more
We present a multi-epoch X-ray spectral analysis of the Seyfert 1 galaxy Fairall 9. Our analysis shows that Fairall 9 displays unique spectral variability in that its ratio residuals to a simple absorbed power law in the 0.5-10 keV band remain constant with time in spite of large variations in flux. This behavior implies an unchanging source geome…
Multispacecraft observations and modeling of the 22/23 June 2015 geomagnetic storm
Russell, C. T.; Anderson, B. J.; Nakamura, R. +9 more
The magnetic storm of 22-23 June 2015 was one of the largest in the current solar cycle. We present in situ observations from the Magnetospheric Multiscale Mission (MMS) and the Van Allen Probes (VAP) in the magnetotail, field-aligned currents from AMPERE (Active Magnetosphere and Planetary Electrodynamics Response), and ionospheric flow data from…
Recurring X-ray outbursts in the supernova impostor SN 2010da in NGC 300
Skillman, E. D.; Kong, A. K. H.; Williams, B. F. +4 more
We present new observations of the `supernova impostor' SN 2010da using the Chandra X-ray Observatory and the Hubble Space Telescope. During the initial 2010 outburst, the 0.3-10 keV luminosity was observed by Swift to be ∼5 × 1038 erg s-1 and faded by a factor of ∼25 in a four month period. Our two new Chandra observations s…
Multi-wavelength Study of the Supernova Remnant Kes 79 (G33.6+0.1): On Its Supernova Properties and Expansion into a Molecular Environment
Safi-Harb, Samar; Zhou, Ping; Zhang, Zhi-Yu +4 more
Kes 79 (G33.6+0.1) is an aspherical thermal composite supernova remnant (SNR) observed across the electromagnetic spectrum and showing an unusual highly structured morphology, in addition to harboring a central compact object (CCO). Using the CO J = 1-0, J = 2-1, and J = 3-2 data, we provide the first direct evidence and new morphological evidence…
Optical and NIR observations of the nearby type Ia supernova SN 2014J
Ojha, D. K.; Anupama, G. C.; Prabhu, T. P. +4 more
Optical and NIR observations of the Type Ia supernova SN 2014J in M82 are presented. The observed light curves are found to be similar to normal Type Ia supernovae (SNe Ia), with a decline rate parameter Δm15(B) = 1.08 ± 0.03. The supernova reached B-band maximum on JD 2456690.14, at an apparent magnitude mB(max) = 11.94. The…
Galaxy Candidates at z ~ 10 in Archival Data from the Brightest of Reionizing Galaxies (BORG[z8]) Survey
Treu, T.; Mason, C. A.; Trenti, M. +9 more
The Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) enabled the search for the first galaxies observed at z ∼ 8-11 (500-700 Myr after the Big Bang). To continue quantifying the number density of the most luminous galaxies (M AB ∼ -22.0) at the earliest epoch observable with HST, we search for z ∼ 10 galaxies (F125W-drop…
Characterization of the Abydos region through OSIRIS high-resolution images in support of CIVA measurements
Bibring, J. -P.; Poulet, F.; Jorda, L. +45 more
Context. On 12 November 2014, the European mission Rosetta delivered the Philae lander on the nucleus of comet 67P/Churyumov-Gerasimenko (67P). After the first touchdown, the lander bounced three times before finally landing at a site named Abydos.
Aims: We provide a morphologically detailed analysis of the Abydos landing site to support Phil…
Low-frequency waves at comet 67P/Churyumov-Gerasimenko. Observations compared to numerical simulations
Goetz, C.; Richter, I.; Glassmeier, K. H. +3 more
Context. A new type of low-frequency wave was detected by the magnetometer of the Rosetta Plasma Consortium at the comet during the initial months after the arrival of the Rosetta spacecraft at comet 67P/Churyumov-Gerasimenko. This large-amplitude, nearly continuous wave activity is observed in the frequency range from 30 mHz to 80 mHz where 40 mH…
Cosmic microwave background acoustic peak locations
Knox, L.; Narimani, A.; Pan, Z. +1 more
The Planck collaboration has measured the temperature and polarization of the cosmic microwave background well enough to determine the locations of eight peaks in the temperature (TT) power spectrum, five peaks in the polarization (EE) power spectrum and 12 extrema in the cross (TE) power spectrum. The relative locations of these extrema give a st…
GG Tau: the ringworld and beyond. Mass accretion and planetary formation in young multiple stellar systems
Dutrey, Anne; Di Folco, Emmanuel; Beck, Tracy +1 more
In binary stellar systems, exoplanet searches have revealed planetary mass companions orbiting both in circumstellar and in circumbinary orbits. Modelling studies suggest increased dynamical complexity around the young stars that form such systems. Circumstellar and circumbinary disks likely exhibit different physical conditions for planet formati…