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Continuum emission enhancements and penumbral changes observed during flares by IRIS, ROSA, and Hinode
Fletcher, L.; Mathioudakis, M.; Guglielmino, S. L. +6 more
In this paper we describe observations acquired by satellite instruments ( Hinode/SOT and IRIS) and ground-based telescopes (ROSA@DST) during two consecutive C7.0 and X1.6 flares occurred in active region NOAA 12205 on 2014 November 7. The analysis of these data show the presence of continuum enhancements during the evolution of the events, observ…
X-Rays from e ± Pair Halos
Ruffolo, D.; Luangtip, W.; Eungwanichayapant, A. +1 more
It was previously suggested that e ± pair halos could be observed in γ-rays. Searching for pair halos is a challenging topic in γ-ray astronomy that has not yet yielded a convincing detection for an individual object. Here we propose that X-ray observations could reveal the existence of e ± pair halos. To support our suggesti…
The influence of Hinode/SOT NFI instrumental effects on the visibility of simulated prominence fine structures in Hα
Gunár, S.; Ichimoto, K.; Jurčák, J.
Context. Models of entire prominences with their numerous fine structures distributed within the prominence magnetic field use approximate radiative transfer techniques to visualize the simulated prominences. However, to accurately compare synthetic images of prominences obtained in this way with observations and to precisely analyze the visibilit…
Effect of Dust Storm and GCR Impact on the Production Rate of O3+ in MY 28 and MY 29: Modeling and SPICAM Observation
Haider, S. A.; Masoom, J.; Bougher, S. +1 more
We have developed a seasonally dependent energy loss model to calculate the zonally averaged production rates of O3+ due to impact of galactic cosmic rays in the dayside troposphere of Mars between solar longitudes (Ls) 0° and 360° at low latitudes (2°N, 2°S, 25°N, and 25°S), midlatitudes (45°N and 45°S), and high …
A robotic pipeline for fast GRB followup with the Las Cumbrés observatory network
Cucchiara, A.; Steele, I. A.; Marongiu, M. +9 more
In the era of multi-messenger astronomy the exploration of the early emission from transients is key for understanding the encoded physics. At the same time, current generation networks of fully-robotic telescopes provide new opportunities in terms of fast followup and sky coverage. This work describes our pipeline designed for robotic optical fol…
Study of eclipsing binary and multiple systems in OB associations V: MQ Cen in Crux OB1
Bakış, Volkan; Bilir, Selçuk; Nitschelm, Christian +6 more
The early-type massive binary MQ Cen (
Mars methane hunt comes up empty, flummoxing scientists
Witze, Alexandra
Trace Gas Orbiter spacecraft did not find the gas in red planet's atmosphere during its first months of operation.
Open cluster candidates in the VVVX area: VVVX CL 076 and CL 077
Minniti, D.; Chené, A. -N.; Borissova, J. +6 more
We are reporting some basic parameters of two newly discovered clusters, VVVX CL076 and CL077, recently discovered in the galactic disk area covered by the VISTA Variables in the Via Lactea eXtended (VVVX) ESO Public Survey. The preliminary analysis shows that both clusters are young and relatively close to the Sun.
No Pulsar Wind Nebula in the Southern Blowout Region of the Cygnus Loop
Gotthelf, E. V.; Halpern, J. P.
We report on optical observations of the Katsuda et al. candidate X-ray pulsar and pulsar wind nebula in the Cygnus Loop supernova remnant. We determine that the point source suggested to be a pulsar is actually the nucleus of a Seyfert 1 galaxy at redshift z = 0.2080, while the diffuse X-ray source, which is displaced by 2.‧6 from the point sourc…
The Modulating Optical Depth of the Photoelectric Absorption Edge with a Pulse Phase in Accretion-powered X-Ray Pulsars
Kitamoto, Shunji; Yoshida, Yuki
We report the first discovery of a pulse phase modulating optical depths at the iron K-edge in accretion-powered X-ray pulsars from Suzaku observations. A significant modulating optical depth of the iron K-edge is detected for Vela X-1 and GX 1+4. Similar trends are seen in GX 301-2 and OAO 1657-415, though with poor statistical significance. The …