Search Publications
CO concentration in the upper stratosphere and mesosphere of Titan from VIMS dayside limb observations at 4.7 µm
D'Aversa, E.; López-Valverde, M. A.; Funke, B. +6 more
During the last 30 years, many works have focused on the determination of the CO abundance in Titan's atmosphere, but no measurement above 300 km has been done yet due to the faint signal of CO. Nevertheless, such measurements are particularly awaited as a confirmation of photochemical models predictions that CO is uniformly mixed in the whole atm…
Tandem Swift and INTEGRAL Data to Revisit the Orbital and Superorbital Periods of 1E 1740.7-2942
Castro, Manuel; Stecchini, Paulo Eduardo; Jablonski, Francisco +2 more
The black hole candidate 1E 1740.7-2942 is one of the strongest hard X-ray sources in the Galactic Center region. No counterparts in longer wavelengths have been identified for this object yet. The presence of characteristic timing signatures in the flux history of X-ray sources has been shown to be an important diagnostic tool for the properties …
On the methanol emission detection in the TW Hya disc: the role of grain surface chemistry and non-LTE excitation
Henning, Th.; Sobolev, A. M.; Semenov, D. A. +3 more
The recent detection of gas-phase methanol (CH3OH) lines in the disc of TW Hya by Walsh et al. provided the first observational constraints on the complex O-bearing organic content in protoplanetary discs. The emission has a ring-like morphology, with a peak at ∼30-50 au and an inferred column density of ∼3-6 × 1012 cm-2…
A Multiply-Imaged z ∼ 6.3 Lyman Alpha Emitter candidate behind Abell 2261
Östlin, Göran; Melinder, Jens; Klessen, Ralf S. +6 more
While the Lyman α (Ly α) emission line serves as an important tool in the study of galaxies at z ≲ 6, finding Ly α emitters (LAE) at significantly higher redshifts has been more challenging, probably because of the increasing neutrality of the intergalactic medium above z ∼ 6. Galaxies with extremely high rest-frame Ly α equivalent widths, EW(Ly α…
Enabling data science in the Gaia mission archive: The present-day mass function and age distribution
Sarro, L. M.; Berihuete, A.; Julbe, F. +2 more
Recent advances in large scale computing architectures enable new opportunities to extract value out of the vast amounts of data being currently generated. However, their successful adoption is not straightforward in areas like science, as there are still some barriers that need to be overcome. Those comprise (i) the existence of legacy code that …
The X-ray decay of the ultraluminous supernova SN 1978K in NGC 1313
Weng, Shan-Shan; Zhao, Hai-Hui; Ng, C. -Y.
The Type IIn supernova (SN) 1978K in the nearby galaxy NGC 1313 has remained bright in multiwavelengths for more than ∼25 yr. The archival data of SN 1978K collected with ROSAT, ASCA, XMM-Newton and Chandra from 1990 to 2006 show no significant variation of the soft X-ray emission but a hint of flux decrease in hard X-rays. In this work, we perfor…
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…