Search Publications
Is 4U 0114+65 an eclipsing HMXB?
Paul, Biswajit; Belloni, Tomaso M.; Pradhan, Pragati +2 more
We present the pulsation and spectral characteristics of the High-Mass X-ray Binary (HMXB) 4U 0114+65 during a Suzaku observation covering the part of the orbit that included the previously known low-intensity emission of the source (dip) and the egress from this state. This dip has been interpreted in previous works as an X-ray eclipse. Notably, …
Steep-spectrum sources of the RCR catalog in the millimeter and submillimeter ranges based on Planck data
Verkhodanov, O. V.; Majorova, E. K.; Zhelenkova, O. P. +2 more
We have investigated the regions of cosmic microwave background maps from the Planck experiment in the neighborhoods of radio sources from the RCR catalog. Based on the measurements of sources from the Planck catalog, we have constructed the calibration curves to determine the brightness of objects. For 34 steep-spectrum objects, for the first tim…
A study of the main resonances outside the geostationary ring
Celletti, Alessandra; Galeş, Cătălin
We investigate the dynamics of satellites and space debris in external resonances, namely in the region outside the geostationary ring. Precisely, we focus on the 1:2, 1:3, 2:3 resonances, which are located at about 66 931.4 km, 87 705.0 km, 55 250.7 km, respectively. Some of these resonances have been already exploited in space missions, like XMM…
Swift J0525.6+2416 and IGR J04571+4527: two new hard X-ray-selected magnetic cataclysmic variables identified with XMM-Newton
Mukai, K.; Israel, G.; de Martino, D. +4 more
IGR J04571+4527 and Swift J0525.6+2416 are two hard X-ray sources detected in the Swift/BAT and INTEGRAL/IBIS surveys. They were proposed to be magnetic cataclysmic variables of the intermediate polar (IP) type, based on optical spectroscopy. IGR J04571+4527 also showed a 1218 s optical periodicity, suggestive of the rotational period of a white d…
Determining energy balance in the flaring chromosphere from oxygen V line ratios
Fletcher, L.; Labrosse, N.; Graham, D. R.
Context. The impulsive phase of solar flares is a time of rapid energy deposition and heating in the lower solar atmosphere, leading to changes in the temperature and density structure of the region.
Aims: We use an O v density diagnostic formed from the λ192 /λ248 line ratio, provided by the Hinode/EIS instrument, to determine the density of…
The physical state of selected cold clumps
Juvela, M.; Parikka, A.; Malinen, J. +2 more
Context. The study of prestellar cores is essential to understanding the initial stages of star formation. With Herschel more cold clumps have been detected than ever before. For this study we have selected 21 cold clumps from 20 Herschel fields observed as a follow-up on original Planck detections. We have observed these clumps in 13CO…
Constraints on the gas content of the Fomalhaut debris belt. Can gas-dust interactions explain the belt's morphology?
Olofsson, G.; Dent, W. R. F.; Kamp, I. +5 more
Context. The 440 Myr old main-sequence A-star Fomalhaut is surrounded by an eccentric debris belt with sharp edges. This sort of a morphology is usually attributed to planetary perturbations, but the orbit of the only planetary candidate detected so far, Fomalhaut b, is too eccentric to efficiently shape the belt. Alternative models that could acc…
The High-velocity System: Infall of a Giant Low-surface-brightness Galaxy toward the Center of the Perseus Cluster
Ohyama, Youichi; Broadhurst, T.; Lim, Jeremy +2 more
The high-velocity system (HVS) lies just north-west of the center and is moving at a speed of 3000 km s-1 toward NGC 1275, the central giant elliptical galaxy in the Perseus cluster. We report imaging spectroscopy of the HVS in Hα and [N ii] that resolves both the nature of this galaxy and its physical relationship with NGC 1275. The HV…
Active region upflows. I. Multi-instrument observations
Doyle, J. G.; Madjarska, M. S.; Huang, Z. +2 more
Context. We study upflows at the edges of active regions, called AR outflows, using multi-instrument observations.
Aims: This study intends to provide the first direct observational evidence of whether chromospheric jets play an important role in furnishing mass that could sustain coronal upflows. The evolution of the photospheric magnetic fi…
The impact of cosmic variance on simulating weak lensing surveys
Mandelbaum, Rachel; Kannawadi, Arun; Lackner, Claire
Upcoming weak lensing surveys will survey large cosmological volumes to measure the growth of cosmological structure with time and thereby constrain dark energy. One major systematic uncertainty in this process is the calibration of the weak lensing shape distortions, or shears. Most upcoming surveys plan to test several aspects of their shear est…