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Two Candidate Optical Counterparts of M82 X-1 from HST Observations
Liu, Jifeng; Bai, Yu; Wang, Song +1 more
Optical counterparts can provide significant constraints on the physical nature of ultraluminous X-ray sources (ULXs). In this Letter, we identify six point sources in the error circle of a ULX in M82, namely M82 X-1, by registering Chandra positions onto Hubble Space Telescope images. Two objects are considered as optical counterpart candidates o…
Mass and Energy of Erupting Solar Plasma Observed with the X-Ray Telescope on Hinode
Moon, Yong-Jae; Reeves, Katharine K.; Raymond, John C. +2 more
We investigate seven eruptive plasma observations by Hinode/XRT. Their corresponding EUV and/or white light coronal mass ejection features are visible in some events. Five events are observed in several passbands in X-rays, which allows for the determination of the eruptive plasma temperature using a filter ratio method. We find that the isotherma…
Multiple AGN in the crowded field of the compact group SDSS J0959+1259
Bianchi, S.; Vignali, C.; Piconcelli, E. +11 more
We present a multiwavelength study of a newly discovered compact group (CG), SDSS J0959+1259, based data from XMM-Newton, Sloan Digital Sky Survey (SDSS) and the Calar Alto optical imager BUSCA. With a maximum velocity offset of 500 km s-1, a mean redshift of 0.035, and a mean spatial extension of 480 kpc, this CG is exceptional in havi…
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…