Search Publications
X-ray development of the classical nova V2672 Ophiuchi with Suzaku
Drake, Jeremy J.; Tsujimoto, Masahiro; Kitamoto, Shunji +1 more
We report on the Suzaku detection of a rapid flare-like X-ray flux amplification early in the development of the classical nova V2672 Ophiuchi. Two target-of-opportunity ∼ 25 ks X-ray observations were made 12 and 22 d after the outburst. The flux amplification was found in the latter half of day 12. Time-sliced spectra are characterized by a grow…
Possible signature of Alfvén wave dissipation in the localized magnetic funnels of the equatorial solar corona
Dwivedi, Bhola N.; Mohan, Anita; Srivastava, Abhishek Kumar
We analyse the Hinode/EIS 2″-spectroscopic scan data containing the spectral line formed at typical inner coronal temperature. The strong Fe XII 195.120 Å line shows the existence of funnel-like expanding flux-tubes which exhibit the signature of blue-/red-shifted plasma motions in the off-limb equatorial corona. These coronal funnels expand in th…
Hinode 7: Conference summary and future suggestions
Priest, Eric
This conclusion to the seventh Hinode science meeting (2013 November in Takayama, Japan) attempts to summarise what we have learnt during the conference (mainly from the review talks) about new observations from Hinode and about theories stimulated by them. Suggestions for future study are also offered.
Systematic X-Ray Analysis of Radio Relic Clusters with Suzaku
Akamatsu, Hiroki; Kawahara, Hajime
We undertook a systematic X-ray analysis of six giant radio relics in four clusters of galaxies using the Suzaku satellite. The sample included CIZA 2242.8+5301, Zwcl 2341.1-0000, the South-East part of A 3667 and previously published results of the North-West part of A 3667 and A 3376. Especially, we first observed the narrow (50 kpc) relic of CI…
K-Shell Line Distribution of Heavy Elements along the Galactic Plane Observed with Suzaku
Koyama, Katsuji; Nobukawa, Masayoshi; Tsuru, Takeshi Go +1 more
We report on the global distribution of the intensities of the K-shell lines from He-like and H-like ions of S, Ar, Ca, and Fe along the Galactic plane. From the profiles, we clearly separate the Galactic center X-ray emission (GCXE) and the Galactic ridge X-ray emission (GRXE). The intensity profiles of the He-like Kα lines of S, Ar, Ca, and Fe a…
X-Ray Echo from the Sagittarius C Complex and 500-year Activity History of Sagittarius A*
Koyama, Katsuji; Nobukawa, Masayoshi; Nakashima, Shinya +3 more
This paper presents Suzaku results obtained for the Sagittarius (Sgr) C region using the concept of X-ray reflection nebulae (XRNe) as the echo of past flares from a super-massive black hole, Sgr A*. The Sgr C complex is composed of several molecular clouds proximately located in projected distance. The X-ray spectra of Sgr C were analyzed based o…
Numerical Simulations of Solar Chromospheric Jets Associated with Emerging Flux
Shibata, Kazunari; Takasao, Shinsuke; Isobe, Hiroaki
We studied the acceleration mechanisms of chromospheric jets associated with emerging flux using a two-dimensional magnetohydrodynamic (MHD) simulation. We found that slow-mode shock waves generated by magnetic reconnection in the chromosphere and the photosphere play key roles in the acceleration mechanisms of chromospheric jets. An important par…
Evidence for a Cool Disk and Inhomogeneous Coronae from Wide-Band Temporal Spectroscopy of Cygnus X-1 with Suzaku
Done, Chris; Makishima, Kazuo; Yamada, Shin'ya +3 more
Unified X-ray spectral and timing studies of Cygnus X-1 in the low/hard and hard intermediate state were conducted in a model-independent manner, using broadband Suzaku data acquired on 25 occasions from 2005 to 2009 with a total exposure of ∼ 450 ks. The unabsorbed 0.1-500 keV source luminosity changed over 0.8%-2.8% of the Eddington limit for 14…
Low-Resolution Spectrum of the Extragalactic Background Light with the AKARI InfraRed Camera
Sakon, Itsuki; Matsuura, Shuji; Wada, Takehiko +2 more
The Extragalactic Background Light (EBL) as integrated light from outside of our Galaxy includes information about the early universe and the Dark Ages. We analyzed spectral data of the astrophysical diffuse emission obtained with the low-resolution spectroscopy mode on the AKARI Infra-Red Camera (IRC) in the
The Nature of Stable Soft X-Ray Emissions in Several Types of Active Galactic Nuclei Observed by Suzaku
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +3 more
To constrain the origin of the soft X-ray excess phenomenon seen in many active galactic nuclei, the intensity-correlated spectral analysis, developed by Noda et al. (2011, PASJ, 63, S925) for Markarian 509, was applied to wide-band (0.5-45 keV) Suzaku data of five representative objects with a relatively weak reflection signature. They are the ty…