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HI properties and star formation history of a fly-by pair of blue compact dwarf galaxies
Staveley-Smith, Lister; Sung, Eon-Chang; Chung, Aeree +3 more
A fly-by interaction has been suggested to be one of the major explanations for enhanced star formation in blue compact dwarf (BCD) galaxies, yet no direct evidence for this scenario has been found to date. In the Hi Parkes all-sky survey (HIPASS), ESO 435-IG 020 and ESO 435-G 016, a BCD pair were found in a common, extended gas envelope of atomic…
An X-Ray Study of Two B+B Binaries: AH Cep and CW Cep
Oskinova, L. M.; Ignace, R.; Hole, K. T. +1 more
AH Cep and CW Cep are both early B-type binaries with short orbital periods of 1.8 days and 2.7 days, respectively. All four components are B0.5V types. The binaries are also double-lined spectroscopic and eclipsing. Consequently, solutions for orbital and stellar parameters make the pair of binaries ideal targets for a study of the colliding wind…
Evidence of a significant rotational non-LTE effect in the CO2 4.3 µm PFS-MEX limb spectra
Feofilov, Artem G.; Rezac, Ladislav; Kutepov, Alexander A.
Since January 2004, the planetary Fourier spectrometer (PFS) on board the Mars Express satellite has been recording near-infrared limb spectra of high quality up to the tangent altitudes ≈ 150 km, with potential information on density and thermal structure of the upper Martian atmosphere. We present first results of our modeling of the PFS short w…
Deuterium fractionation of a distant cold dark cloud along the line of sight of W51
Gerin, M.; Vastel, C.; Mookerjea, B. +1 more
Herschel/HIFI observations toward the compact HII region W51 has revealed the presence of a cold dense core along its line of sight in a high-velocity stream located just in front of W51. This detection has been made possible through absorption measurements of low-energy transitions of HDO, NH3, and C3 against the bright back…
Overall properties of the Gaia DR1 reference frame
Liu, N.; Zhu, Z.; Liu, J. -C. +1 more
Aims: The first Gaia data release (Gaia DR1) provides 2191 ICRF2 sources with their positions in the auxiliary quasar solution and five astrometric parameters - positions, parallaxes, and proper motions - for stars in common between the Tycho-2 catalogue and Gaia in the joint Tycho-Gaia astrometric solution (TGAS). We aim to analyze the overa…
The calibration of read-out-streak photometry in the XMM-Newton Optical Monitor and the construction of a bright-source catalogue
Carter, M.; Talavera, A.; Page, M. J. +7 more
The dynamic range of the XMM-Newton Optical Monitor (XMM-OM) is limited at the bright end by coincidence loss, the superposition of multiple photons in the individual frames recorded from its micro-channel-plate (MCP) intensified charge-coupled device (CCD) detector. One way to overcome this limitation is to use photons that arrive during the fram…
Disrupted Asteroid P/2016 G1. II. Follow-up Observations from the Hubble Space Telescope
Moreno, F.; Pinilla-Alonso, N.; Licandro, J. +3 more
After the early observations of the disrupted asteroid P/2016 G1 with the 10.4 m Gran Telescopio Canarias (GTC) and modeling of the dust ejecta, we have performed a follow-up observational campaign of this object using the Hubble Space Telescope (HST) during two epochs (2016 June 28 and July 11). The analysis of these HST images with the same mode…
Astronomical imaging with the X-ray observatory Hitomi
Nakajima, Hiroshi; Hitomi Collaboration
We report an imaging capability of the Japan-led X-ray observatory Hitomi, formerly known as ASTRO-H. It carries four scientific instruments of Soft X-ray Imager (SXI: CCD camera), Hard X-ray Imager (HXI), Soft X-ray Spectrometer, and Soft Gamma-ray Detector, allowing us to perform a wide-band high-sensitive imaging spectroscopy. We highlight the …
Measurement of Solar Neutrons on 05 March 2012, Using a Fiber-Type Neutron Monitor Onboard the Attached Payload to the ISS
Masuda, S.; Muraki, Y.; Kawano, H. +3 more
The solar neutron detector Space Environment Data Acquisition Equipment - Attached Payload (SEDA-FIB) onboard the International Space Station (ISS) detected several events from the solar direction associated with three large solar flares observed on 05 (X1.1), 07 (X5.4), and 09 (M6.3) March 2012. In this study, we focus on the interesting event of…
Temporal Variations in Solar Irradiance Since 1947
Tebabal, A.; Damtie, B.; Nigussie, M. +1 more
The study of variations in total solar irradiance (TSI) and spectral irradiance is important for understanding how the Sun affects the Earth's climate. A data-driven approach is used in this article to analyze and model the temporal variation of the TSI and Mg II index back to 1947. In both cases, observed data in the time interval of the satellit…