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On the Origin of the 11.3 Micron Unidentified Infrared Emission Feature
Zhang, Yong; Kwok, Sun; Sadjadi, SeyedAbdolreza
The 11.3 µm emission feature is a prominent member of the family of unidentified infrared emission (UIE) bands and is frequently attributed to out-of-plane bending modes of polycyclic aromatic hydrocarbon (PAH) molecules. We have performed quantum mechanical calculations of 60 neutral PAH molecules and found that it is difficult to reconcile…
New constraints on the CH4 vertical profile in Uranus and Neptune from Herschel observations
Hartogh, P.; Lellouch, E.; Feuchtgruber, H. +6 more
Dedicated line observations of CH4 rotational lines performed with Herschel/PACS and HIFI in 2009-2011 provide new inferences of the mean methane profile in the upper tropospheres and stratospheres of Uranus and Neptune. At Uranus, CH4 is found to be near saturation, with a ~9 × 10-4 tropopause/lower stratosphere m…
Pan-STARRS1 variability of XMM-COSMOS AGN. I. Impact on photometric redshifts
Salvato, M.; Chambers, K. C.; Flewelling, H. +12 more
Aims: Upcoming large area sky surveys like Euclid and eROSITA, which are dedicated to studying the role of dark energy in the expansion history of the Universe and the three-dimensional mass distribution of matter, crucially depend on accurate photometric redshifts. The identification of variable sources, such as active galactic nuclei (AGNs)…
The Metal-enriched Thermal Composite Supernova Remnant Kesteven 41 (G337.8-0.1) in a Molecular Environment
Zhou, Ping; Su, Yang; Zhou, Xin +3 more
The physical nature of thermal composite supernova remnants (SNRs) remains controversial. We have revisited the archival XMM-Newton and Chandra data of the thermal composite SNR Kesteven 41 (Kes 41 or G337.8-0.1) and performed a millimeter observation toward this source in the 12CO, 13CO, and C18O lines. The X-ray …
The SLUGGS survey: multipopulation dynamical modelling of the elliptical galaxy NGC 1407 from stars and globular clusters
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +7 more
We perform in-depth dynamical modelling of the luminous and dark matter (DM) content of the elliptical galaxy NGC 1407. Our strategy consists of solving the spherical Jeans equations for three independent dynamical tracers: stars, blue globular clusters (GCs) and red GCs in a self-consistent manner. We adopt a maximum-likelihood Markov Chain Monte…
Evaluating the Morphology of the Local Interstellar Medium: Using New Data to Distinguish between Multiple Discrete Clouds and a Continuous Medium
Redfield, Seth; Linsky, Jeffrey L.
Ultraviolet and optical spectra of interstellar gas along the lines of sight to nearby stars have been interpreted by Redfield & Linsky and previous studies as a set of discrete warm, partially ionized clouds each with a different flow vector, temperature, and metal depletion. Recently, Gry & Jenkins proposed a fundamentally different mode…
First Infrared-Based Implications for the Dust Attenuation and Star Formation of Typical Lyα Emitters
Ouchi, Masami; Shimasaku, Kazuhiro; Nakajima, Kimihiko +1 more
By stacking publicly available deep Spitzer/MIPS 24 µm and Herschel/PACS images for 213 z≃ 2.18 Lyα Emitters (LAEs) in GOODS-South, we obtain a strong upper limit to the IR luminosity of typical LAEs and discuss their attenuation curve for the first time. The 3σ upper limit LTIR3σ = 1.1× {{10}10} {{L}⊙ …
Testing the inversion of asteroids' Gaia photometry combined with ground-based observations
Tanga, P.; Cellino, A.; Bartczak, P. +2 more
We investigated the reliability of the genetic algorithm which will be used to invert the photometric measurements of asteroids collected by the European Space Agency Gaia mission. To do that, we performed several sets of simulations for 10 000 asteroids having different spin axis orientations, rotational periods and shapes. The observational epoc…
Cosmological tests of modified gravity: Constraints on F (R ) theories from the galaxy clustering ratio
Brax, Philippe; Marinoni, Christian; Bel, Julien +1 more
The clustering ratio η , a large-scale structure observable originally designed to constrain the shape of the power spectrum of matter density fluctuations, is shown to provide a sensitive probe of the nature of gravity in the cosmological regime. We apply this analysis to F (R ) theories of gravity using the luminous red galaxy sample extracted f…
Surface charging and electrostatic dust acceleration at the nucleus of comet 67P during periods of low activity
Coates, A. J.; Jones, G. H.; Roussos, E. +2 more
We have investigated through simulation the electrostatic charging of the nucleus of Comet 67P/Churyumov-Gerasimenko during periods of weak outgassing activity. Specifically, we have modeled the surface potential and electric field at the surface of the nucleus during the initial Rosetta rendezvous at 3.5 AU and the release of the Philae lander at…