Search Publications
3D Electric Waveforms of Solar Wind Turbulence
Goetz, K.; Kellogg, P. J.; Monson, S. J.
Electric fields provide the major coupling between the turbulence of the solar wind and particles. A large part of the turbulent spectrum of fluctuations in the solar wind is thought to be kinetic Alfvén waves; however, whistlers have recently been found to be important. In this article, we attempt to determine the mode identification of individua…
Exploring the Spectral Variability of the Ultraluminous X-Ray Source M81 X-6 with Suzaku and XMM-Newton
Jithesh, V.; Misra, Ranjeev
We present X-ray spectral variability studies of the ultraluminous X-ray source (ULX) M81 X-6 using Suzaku and XMM-Newton observations performed during 2001-2015. The spectra were first fitted by a standard multitemperature disk and a thermal Comptonization component that revealed spectral variability where the primary distinction is the change in…
The First Glitch in a Central Compact Object Pulsar: 1E 1207.4-5209
Gotthelf, E. V.; Halpern, J. P.
Since its discovery as a pulsar in 2000, the central compact object (CCO) 1E 1207.4-5209 in the supernova remnant PKS 1209-51/52 had been a stable 0.424 s rotator with an extremely small spin-down rate and weak ({B}s≈ 9× {10}10 G) surface dipole magnetic field. In 2016 we observed a glitch from 1E 1207.4-5209 of at least {{Δ …
Searching Ultra-compact Pulsar Binaries with Abnormal Timing Behavior
Gong, B. P.; Li, Y. P.; Yuan, J. P. +8 more
Ultra-compact pulsar binaries are both ideal sources of gravitational radiation for gravitational wave detectors and laboratories for fundamental physics. However, the shortest orbital period of all radio pulsar binaries is currently 1.6 hr. The absence of pulsar binaries with a shorter orbital period is most likely due to technique limit. This pa…
Formation of Large-scale Coronal Loops Interconnecting Two Active Regions through Gradual Magnetic Reconnection and an Associated Heating Process
Liu, Chang; Wang, Haimin; Chen, Yao +5 more
Coronal loops interconnecting two active regions (ARs), called interconnecting loops (ILs), are prominent large-scale structures in the solar atmosphere. They carry a significant amount of magnetic flux and therefore are considered to be an important element of the solar dynamo process. Earlier observations showed that eruptions of ILs are an impo…
Discovery of a Very Large (≈20 kpc) Galaxy at z = 3.72
Inami, Hanae; Reddy, Naveen; Dey, Arjun +12 more
We report the discovery and spectroscopic confirmation of a very large star-forming galaxy, G6025, at {z}spec} =3.721+/- 0.003. In the rest frame ≈2100 Å, G6025 subtends ≈24 kpc in physical extent when measured from the 1.5σ isophote, in agreement with the parametric size measurements that yield a half-light radius of 4.9 ± 0.5 kpc and …
The First Orbital Period of a Very Bright and Fast Nova in M31: M31N 2013-01b
Mereghetti, Sandro; Salvaterra, Ruben; De Luca, Andrea +5 more
We present the first X-ray and UV/optical observations of a very bright and fast nova in the disk of M31, M31N 2013-01b. The nova reached a peak magnitude R ∼ 15 mag and decayed by 2 mag in only 3 days, making it one of the brightest and fastest novae ever detected in Andromeda. From archival multiband data we have been able to trace its fast evol…
The Effects of Barycentric and Asymmetric Transverse Velocities on Eclipse and Transit Times
Stassun, Keivan G.; Prša, Andrej; Conroy, Kyle E. +1 more
It has long been recognized that the finite speed of light can affect the observed time of an event. For example, as a source moves radially toward or away from an observer, the path length and therefore the light travel time to the observer decreases or increases, causing the event to appear earlier or later than otherwise expected, respectively.…
SOFIA/HAWC+ Detection of a Gravitationally Lensed Starburst Galaxy at z = 1.03
Staguhn, Johannes; Dowell, C. Darren; Fadda, Dario +13 more
We present the detection at 89 µm (observed frame) of the Herschel-selected gravitationally lensed starburst galaxy HATLAS J1429-0028 (also known as G15v2.19) in 15 minutes with the High-resolution Airborne Wideband Camera-plus (HAWC+) onboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The spectacular lensing system consis…
Probing Signatures of a Distant Planet around the Young T-Tauri Star CI Tau Hosting a Possible Hot Jupiter
Hashimoto, Jun; Konishi, Mihoko; Hori, Yasunori
We search for signatures of a distant planet around the two million-year-old classical T-Tauri star CI Tau hosting a hot-Jupiter candidate ({M}{{p}}\sin i∼ 8.1 {M}Jupiter}) in an eccentric orbit (e ∼ 0.3). To probe the existence of an outer perturber, we reanalyzed 1.3 mm dust continuum observations of the protoplanetary disk…