Search Publications
Jupiter cloud morphology and zonal winds from ground-based observations before and during Juno's first perijove
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +8 more
We analyze Jupiter observations between December 2015 and August 2016 in the 0.38-1.7 µm wavelength range from the PlanetCam instrument at the 2.2 m telescope at Calar Alto Observatory and in the optical range by amateur observers contributing to the Planetary Virtual Observatory Laboratory. Over this time Jupiter was in a quiescent state wi…
No Neon, but Jets in the Remarkable Recurrent Nova M31N 2008-12a?—Hubble Space Telescope Spectroscopy of the 2015 Eruption
Ness, J. -U.; Henze, M.; Shafter, A. W. +14 more
The 2008 discovery of an eruption of M31N 2008-12a began a journey on which the true nature of this remarkable recurrent nova continues to be revealed. M31N 2008-12a contains a white dwarf (WD) close to the Chandrasekhar limit, accreting at a high rate from its companion, and undergoes thermonuclear eruptions that are observed yearly and may even …
Discovery of Two Small High-velocity Compact Clouds in the Central 10 pc of Our Galaxy
Oka, Tomoharu; Iwata, Yuhei; Nomura, Mariko +2 more
We discovered two small high-velocity compact clouds (HVCCs) in the HCN J = 4-3 and J = 3-2 maps of the central 20 pc of our Galaxy. Both HVCCs have broad velocity widths ({{Δ }}V≳ 40 km s-1) and compact sizes (d∼ 1 {pc}), and originate from the dense molecular clouds in the position-velocity space. One of them has a faint counterpart i…
Detection of Very Low-frequency, Quasi-periodic Oscillations in the 2015 Outburst of V404 Cygni
Kouveliotou, C.; Gehrels, N.; van der Klis, M. +12 more
In 2015 June, the black hole X-ray binary (BHXRB) V404 Cygni went into outburst for the first time since 1989. Here, we present a comprehensive search for quasi-periodic oscillations (QPOs) of V404 Cygni during its recent outburst, utilizing data from six instruments on board five different X-ray missions: Swift/XRT, Fermi/GBM, Chandra/ACIS, INTEG…
The properties, origin and evolution of stellar clusters in galaxy simulations and observations
Dale, D. A.; Calzetti, D.; Smith, L. J. +16 more
We investigate the properties and evolution of star particles in two simulations of isolated spiral galaxies, and two galaxies from cosmological simulations. Unlike previous numerical work, where typically each star particle represents one `cluster', for the isolated galaxies we are able to model features we term `clusters' with groups of particle…
The 1600 Å Emission Bump in Protoplanetary Disks: A Spectral Signature of H2O Dissociation
France, Kevin; Roueff, Evelyne; Abgrall, Hervé
The FUV continuum spectrum of many accreting pre-main sequence stars, Classical T Tauri Stars (CTTSs), does not continue smoothly from the well-studied Balmer continuum emission in the NUV, suggesting that additional processes contribute to the short-wavelength emission in these objects. The most notable spectral feature in the FUV continuum of so…
Brittle ice shell thickness of Enceladus from fracture distribution analysis
Cremonese, G.; Massironi, M.; Lucchetti, A. +2 more
We determine the depth of fracture penetration in multiple regions of Enceladus by performing self-similar clustering and length distribution analysis of fractures. The statistical characterization of fault-population attribute, such as length and clustering, provide a productive avenue for exploring deformation rate, stress transmission mode, rhe…
ALMA Multiple-transition Molecular Line Observations of the Ultraluminous Infrared Galaxy IRAS 20551-4250: Different HCN, HCO+, and HNC Excitation, and Implications for Infrared Radiative Pumping
Imanishi, Masatoshi; Izumi, Takuma; Nakanishi, Kouichiro
We present our ALMA multi-transition molecular line observational results for the ultraluminous infrared galaxy IRAS 20551-4250, which is known to contain a luminous buried active galactic nucleus and shows detectable vibrationally excited (v 2 = 1f) HCN and HNC emission lines. The rotational J = 1-0, 4-3, and 8-7 of HCN, {HCO}}+
General quadrupolar statistical anisotropy: Planck limits
Ramazanov, S.; Rubtsov, G.; Thorsrud, M. +1 more
Several early Universe scenarios predict a direction-dependent spectrum of primordial curvature perturbations. This translates into the violation of the statistical isotropy of cosmic microwave background radiation. Previous searches for statistical anisotropy mainly focussed on a quadrupolar direction-dependence characterised by a single multipol…
Predicting emission line fluxes and number counts of distant galaxies for cosmological surveys
Cimatti, A.; Daddi, E.; Rodighiero, G. +9 more
We estimate the number counts of line emitters at high redshift and their evolution with cosmic time based on a combination of photometry and spectroscopy. We predict the H α, H β, [O II], and [O III] line fluxes for more than 35 000 galaxies down to stellar masses of ∼109 M⊙ in the COSMOS and GOODS-S fields, applying standar…