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Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
James, D. J.; Bouvier, J.; Santos, N. C. +4 more
We present the results of an optical photometry and high-resolution spectroscopy campaign for a modest sample of X-ray selected stars in the Chamaeleon and Rho Ophiuchus star-forming regions. With R∼ 50 000 optical spectra, we establish kinematic membership of the parent association and confirm stellar youth for each star in our sample. With the a…
Searching for X-ray sources in nearby late-type galaxies with low-star formation rates
Kaaret, P.; Poutanen, J.; Kajava, J. J. E. +4 more
Late-type non-starburst galaxies have been shown to contain X-ray emitting objects, some being ultraluminous X-ray sources. We report on XMM-Newton observations of 11 nearby, late-type galaxies previously observed with the Hubble Space Telescope (HST) in order to find such objects. We found 18 X-ray sources in or near the optical extent of the gal…
Erratum: Discovery of H I gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder
Forsyth, R.; Sault, R. J.; Heywood, I. +100 more
Altitude of the upper boundary of AAR based on observations of ion beams in inverted-V structures: A case study
Xie, Lun; Parks, George; Cui, YanBo +5 more
Outflowing ion beams forming four successive inverted-V structures in the energy-time spectrograms of H+, He+, and O+ were observed at an altitude of 3.4 RE by Cluster satellites travelling above the auroral acceleration region (AAR) in the southern hemisphere on February 14, 2001. Energization by negative U-shaped potential structures in the AAR …
The 6-7 µm spectrum of Titan from ISO/SWS observations
Lellouch, Emmanuel; Feuchtgruber, Helmut; Courtin, Régis +1 more
We have analyzed spectroscopic observations of Titan performed in January 1997 by the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory in the wavelength range from 5.3 to 7.0 µm (1422-1890 cm-1). This spectral interval is of particular interest because it contains various molecular transitions, particularly th…
The XMM-Newton1 and INTEGRAL2 Observations of the Supergiant Fast X-Ray Transient IGR J16328-4726
Piro, L.; Bird, A. J.; Fiocchi, M. +6 more
The accretion mechanism producing the short flares observed from the Supergiant Fast X-ray Transients (SFXT) is still highly debated and forms a major part in our attempts to place these X-ray binaries in the wider context of the High Mass X-ray Binaries. We report on a 216 ks INTEGRAL observation of the SFXT IGR J16328-4726 (2014 August 24-27) si…
Chromospheric spicules and solar corona
Yakunina, G. V.; Porfir'eva, G. A.
Results of recent observations of chromospheric spicules on the Sun, obtained during the last decades, are briefly reviewed. Data on spicules of different types and their possible counterparts on the solar disk have been collected. Their properties, such as lifetimes, length, thickness, velocities, connection with underlying magnetic field and sup…
V620 Oph = CoRoT 104190253 - a misclassified RR Lyrae star
Benko, J. M.
The comptonization parameter from simulations of single-frequency, single-dish, dual-beam, cm-wave observations of galaxy clusters and mitigating CMB confusion using the Planck sky survey
Lew, Bartosz; Roukema, Boudewijn F.
Systematic effects in dual-beam, differential, radio observations of extended objects are discussed in the context of the One Centimeter Receiver Array (OCRA). We use simulated samples of Sunyaev-Zel'dovich (SZ) galaxy clusters at low (z < 0.4) and intermediate (0.4 < z < 1.0) redshifts to study the implications of operating at a single f…
Development of low-noise high-speed analog ASIC for X-ray CCD cameras and wide-band X-ray imaging sensors
Hayashida, Kiyoshi; Nakajima, Hiroshi; Anabuki, Naohisa +8 more
We report on the development and performance evaluation of the mixed-signal Application Specific Integrated Circuit (ASIC) developed for the signal processing of onboard X-ray CCD cameras and various types of X-ray imaging sensors in astrophysics. The quick and low-noise readout is essential for the pile-up free imaging spectroscopy with a future …