Search Publications
Very Large Array Ammonia Observations of the HH 111/HH 121 Protostellar System: A Detection of a New Source with a Peculiar Chemistry
Pineda, Jaime E.; Qin, Sheng-Li; Indebetouw, Remy +4 more
We present the results of Very Large Array NH3 (J,K)=(1,1) and (2,2) observations of the HH 111/HH 121 protostellar system. HH 111, with a spectacular collimated optical jet, is one of the most well-known Herbig-Haro objects. We report the detection of a new source, NH3-S, in the vicinity of HH 111/HH 121 (∼0.03 pc from the H…
Embedded Filaments in IRAS 05463+2652: Early Stage of Fragmentation and Star Formation Activities
Dewangan, L. K.; Ojha, D. K.; Baug, T. +1 more
We present a multiwavelength data analysis of IRAS 05463+2652 (hereafter I05463+2652) to study star formation mechanisms. A shell-like structure around I05463+2652 is evident in the Herschel column density map, which is not associated with any ionized emission. Based on the Herschel submillimeter images, several parsec-scale filaments (including t…
Polarization Radiation with Turbulent Magnetic Fields from X-Ray Binaries
Lu, Ju-Fu; Xiang, Fu-Yuan; Zhang, Jian-Fu
We study the properties of polarized radiation in turbulent magnetic fields from X-ray binary jets. These turbulent magnetic fields are composed of large- and small-scale configurations, which result in the polarized jitter radiation when the characteristic length of turbulence is less than the non-relativistic Larmor radius. On the contrary, the …
Photoionization Modeling of Titan’s Dayside Ionosphere
Wahlund, J. -E.; Edberg, N. J. T.; Vigren, E. +4 more
Previous modeling studies of Titan’s dayside ionosphere predict electron number densities that are roughly a factor of 2 higher than those observed by the RPWS/Langmuir probe. The issue can equivalently be described as the ratio between the calculated electron production rates and the square of the observed electron number densities resulting in r…
Three-minute Sunspot Oscillations Driven by Magnetic Reconnection in a Light Bridge
Moon, Yong-Jae; Yurchyshyn, Vasyl; Chae, Jongchul +5 more
We report a different type of three-minute chromospheric oscillation above a sunspot in association with a small-scale impulsive event in a light bridge (LB). During our observations, we found a transient brightening in the LB. The brightening was composed of elementary bursts that may be a manifestation of fast repetitive magnetic reconnections i…
A Librational Model for the Propeller Blériot in the Saturnian Ring System
Seiß, M.; Spahn, F.; Hoffmann, H. +2 more
The reconstruction of the orbital evolution of the propeller structure Blériot orbiting in Saturn’s A ring from recurrent observations in Cassini ISS images yielded a considerable offset motion from the expected Keplerian orbit. This offset motion can be composed by three sinusoidal harmonics with amplitudes and periods of 1845, 152, 58 km and 11.…
Spiky Structures around Reconnection Exhausts in the Solar Wind
Přech, Lubomír; Němeček, Zdeněk; Šafránková, Jana +1 more
The paper presents for the first time observations of unusual reconnection events in the solar wind. In all solar wind types, we identify magnetic reconnection exhausts accompanied by one or two side jets. This complex structure is created around a single current sheet and the jet(s) oriented in the same direction as the main exhaust is (are) spat…
Tandem Swift and INTEGRAL Data to Revisit the Orbital and Superorbital Periods of 1E 1740.7-2942
Castro, Manuel; Stecchini, Paulo Eduardo; Jablonski, Francisco +2 more
The black hole candidate 1E 1740.7-2942 is one of the strongest hard X-ray sources in the Galactic Center region. No counterparts in longer wavelengths have been identified for this object yet. The presence of characteristic timing signatures in the flux history of X-ray sources has been shown to be an important diagnostic tool for the properties …
An X-Ray Study of Two B+B Binaries: AH Cep and CW Cep
Oskinova, L. M.; Ignace, R.; Hole, K. T. +1 more
AH Cep and CW Cep are both early B-type binaries with short orbital periods of 1.8 days and 2.7 days, respectively. All four components are B0.5V types. The binaries are also double-lined spectroscopic and eclipsing. Consequently, solutions for orbital and stellar parameters make the pair of binaries ideal targets for a study of the colliding wind…
Kepler Data on KIC 7341653: A Nearby M Dwarf with Monster Flares and a Phase-coherent Variability
Makarov, Valeri V.; Goldin, Alexey
KIC 7341653 is one of several late-type M dwarfs observed by the main mission of Kepler with peculiar infrared colors placing them in the domain of suspected young stellar objects (YSO). It is likely associated with a powerful X-ray emitter with X-ray flares. Kepler light curves reveal two distinct types of activity: frequent flares lasting from l…