Search Publications
Widely Extended [O III] 88µm Line Emission around the 30 Doradus Region Revealed with AKARI FIS-FTS
Kaneda, Hidehiro; Takahashi, Hidenori; Murakami, Noriko +7 more
We present a distribution map of the far-infrared [O II] 88 µm line emission around the 30 Doradus (30 Dor) region in the Large Magellanic Cloud obtained with the Fourier Transform Spectrometer of the Far-Infrared Surveyor on board AKARI. The map reveals that the [O III] emission is widely distributed by more than 10' around the super star c…
3-D mesoscale MHD simulations of a cusp-like magnetic configuration: method and first results
Adamson, E.; Nykyri, K.
We present a local mesoscale model of the magnetospheric cusp region with high resolution (up to 300 km). We discuss the construction and implementation of the initial configuration and give a detailed description of the numerical simulation. An overview of simulation results for the case of strongly northward interplanetary magnetic field (IMF) i…
CoRoT light curves of Blazhko RR Lyrae stars. Evidence of a strong correlation between phase and amplitude modulations of CoRoT ID 0105288363
Auvergne, M.; Baglin, A.; Bono, G. +4 more
Context. The CoRoT - Convection Rotation and planetary Transits - space mission provides a unique opportunity to monitor RR Lyrae stars with excellent time-sampling, unprecedented photometric precision, and a long time base of 150 days.
Aims: The pulsation characteristics of RR Lyrae stars rely on robust physics, but we still lack a firm quan…
A bolometric Bond albedo map of Iapetus: Observations from Cassini VIMS and ISS and Voyager ISS
Buratti, Bonnie J.; Blackburn, David G.; Ulrich, Richard
We utilized Cassini VIMS, Cassini ISS, and Voyager ISS observations of Iapetus to produce the first bolometric Bond albedo map of Iapetus. The average albedo values for the leading and trailing hemispheres are 0.06 ± 0.01 and 0.25 ± 0.03, respectively. However, the bright material in high-resolution ISS images has a value of 0.38 ± 0.04, highlight…
Ultra-compact Dwarfs in the Fossil Group NGC 1132
Madrid, Juan P.
Eleven ultra-compact dwarf (UCD) and 39 extended star cluster candidates are found to be associated with the galaxy NGC 1132. This giant elliptical galaxy is the remnant of a fossil group. UCD and extended star cluster candidates are identified through the analysis of their structural parameters, colors, spatial distribution, and luminosity using …
Far-infrared Imaging of Post-asymptotic Giant Branch Stars and (Proto)-planetary Nebulae with the AKARI Far-Infrared Surveyor
García-Lario, P.; García-Hernández, D. A.; Manchado, A. +1 more
By tracing the distribution of cool dust in the extended envelopes of post-asymptotic giant branch stars and (proto)-planetary nebulae ((P)PNe), we aim to recover, or constrain, the mass-loss history experienced by these stars in their recent past. The Far-Infrared Surveyor (FIS) instrument on board the AKARI satellite was used to obtain far-infra…
Planetary X-ray fluorescence analogue laboratory experiments and an elemental abundance algorithm for C1XS
Smith, David R.; Swinyard, Bruce M.; Gow, Jason +5 more
We have conducted laboratory experiments as an analogue to planetary XRF (X-ray fluorescence) missions in order to investigate the role of changing incidence (and phase) angle geometry and sample grain-size on the intensity of XRF from regolith-like samples. Our data provide evidence of a grain-size effect, where XRF line intensity decreases with …
Long-period oscillations of millimeter emission above sunspots
Riehokainen, A.; Kallunki, J.; Smirnova, V. +2 more
Aims: The investigation of long quasi-periodic oscillations in sunspots/active regions based on millimeter radio data was the main goal of this work.
Methods: Data from simultaneous monitoring observations of solar active regions at 37 GHz and 93 GHz at two different ground-based radio telescopes were obtained. We analyzed them with the …
Physical Structure of the Planetary Nebula NGC 3242 from the Hot Bubble to the Nebular Envelope
Guerrero, Martín A.; Chu, You-Hua; Gruendl, Robert A. +1 more
One key feature of the interacting stellar winds model of the formation of planetary nebulae (PNe) is the presence of shock-heated stellar wind confined in the central cavities of PNe. This so-called hot bubble should be detectable in X-rays. Here we present XMM-Newton observations of NGC 3242, a multiple-shell PN whose shell morphology is consist…
Unveiling the Nature of IGR J17177-3656 with X-Ray, Near-infrared, and Radio Observations
Nowak, M. A.; Chaty, S.; Rodriguez, J. +6 more
We report on the first broadband (1-200 keV) simultaneous Chandra-INTEGRAL observations of the recently discovered hard X-ray transient IGR J17177-3656 that took place on 2011 March 22, about two weeks after the source discovery. The source had an average absorbed 1-200 keV flux of about 8 × 10-10 erg cm-2 s-1. We …