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UV slope of z ∼ 3 bright (L > L*) Lyman-break galaxies in the COSMOS field
Castellano, M.; Pentericci, L.; Santini, P. +7 more
Context. The analysis of the UV slope β of Lyman-break galaxies (LBG) at different luminosities and redshifts is fundamental for understanding their physical properties, and in particular, their dust extinction.
Aims: We analyse a unique sample of 517 bright (L > L*) LBGs at redshift z ∼ 3 in order to characterise the distributi…
Tiny grains shining bright in the gaps of Herbig Ae transitional discs
Monnier, John D.; Kraus, Stefan; Federrath, Christoph +7 more
This work presents a study of two Herbig Ae transitional discs, Oph IRS 48 and HD 169142; which both have reported rings in their dust density distributions. We use Keck-II/NIRC2 adaptive optics imaging observations in the L' filter (3.8 µm) to probe the regions of these discs inwards of {∼ }20 au from the star. We introduce our method for i…
Galaxy rotation curve from classical Cepheids
Gnaciński, Piotr
The galaxy rotation curve is usually assumed to be flat. However, some galaxies have rotation curves that are lower than the flat rotation curve. In our galaxy, the Keplerian rotation of interstellar clouds in the galactic longitude l = 135° was observed. We use a kinematic approach to derive the rotational velocity of classical Cepheids. The rota…
Revised wavelength and spectral response calibrations for AKARI near-infrared grism spectroscopy: Post-cryogenic phase
Nakagawa, Takao; Baba, Shunsuke; Onaka, Takashi +2 more
We present a new calibration for the second-order light contamination in the near-infrared grism spectroscopy with the Infrared Camera aboard AKARI, specifically for the post-cryogenic phase of the satellite (Phase 3). Following our previous work on the cryogenic phase (Phases 1 and 2), the wavelength and spectral response calibrations were revise…
Active galactic nucleus selection in the AKARI NEP-Deep field with the fuzzy support vector machine algorithm
Goto, Tomotsugu; Matsuhara, Hideo; Poliszczuk, Artem +15 more
The aim of this work is to create a new catalog of reliable active galactic nucleus (AGN) candidates selected from the AKARI NEP-Deep field. Selection of the AGN candidates was done by applying a fuzzy support vector machine algorithm, which allows the incorporation of measurement uncertainties into the classification process. The training dataset…
Wave Activity in Jupiter's North Equatorial Belt From Near-Infrared Reflectivity Observations
Wong, Michael H.; Irwin, Patrick G. J.; Orton, Glenn S. +4 more
High spatial resolution images of Jupiter at 1.58-2.28 µm are used to track and characterize a wave pattern observed in 2017 at a planetocentric latitude of 14°N. The wave pattern has a wave number of 18 and spans ∼5° in latitude. One bright crest remains stationary in System III longitude, while the remaining crests move slowly westward. Th…
QSO2 outflow characterization using data obtained with OSIRIS at the Gran Telescopio Canarias
Cabrera-Lavers, Antonio; Bellocchi, Enrica; Emonts, Bjorn +1 more
Context. Ionized outflows are ubiquitous in non-radio-loud obscured quasars (QSO2s) at different redshifts. However, the actual size of the outflows and their efficiency for gas ejection and star formation truncation are controversial. Large-scale (exceeding several kiloparsec) extended radio structures might be necessary to identify (even to trig…
Shape evolution of cometary nuclei via anisotropic mass loss
Vavilov, D. E.; Eggl, S.; Medvedev, Yu. D. +1 more
Context. Breathtaking imagery recorded during the European Space Agency Rosetta mission confirmed the bilobate nature of the nucleus of comet 67P/Churyumov-Gerasimenko. The peculiar appearance of the nucleus is not unique among comets. The majority of cometary cores imaged at high resolution exhibit a similar build. Various theories have been brou…
Triangulum-Andromeda Overdensity: a Region with a Complex Stellar Population
Souto, Diogo; Cunha, K.; Majewski, S. R. +4 more
The Triangulum-Andromeda (TriAnd) overdensity is a distant structure of the Milky Way located in the second Galactic quadrant well below the Galactic plane. Since its discovery, its nature has been under discussion, whether it could be old perturbations of the Galactic disk or the remains of a disrupted former dwarf galaxy. In this study, we inves…
Prospects for detecting the astrometric signature of Barnard's Star b
Zucker, S.; Reiners, A.; Ribas, I. +2 more
A low-amplitude periodic signal in the radial velocity (RV) time series of Barnard's Star was recently attributed to a planetary companion with a minimum mass of 3.2 M⊕ at an orbital period of 233 days. The relatively long orbital period and the proximity of Barnard's Star to the Sun raises the question whether the true mass of the plan…