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Astrometric measurement and reduction of Pulkovo photographic observations of the main Saturnian satellites from 1972 to 2007 in the Gaia reference frame
Narizhnaya, N. V.; Apetyan, A. A.; Bikulova, D. A. +3 more
Context. We present a remeasurement of old photographic plates, providing important raw data for dynamical studies of the Saturnian satellite system. The unprecedentedly accurate realization of the Gaia reference frame allows us to make a precise calibration of digitized astronegatives of the Saturnian satellite images.
Aims: We reprocessed 3…
Substructure analysis of the RXCJ0232.2-4420 galaxy cluster
Kale, Ruta; Parekh, Viral; Laganá, Tatiana F.
RXCJ0232.2-4420, at z = 0.28, is a peculiar system hosting a radio halo source around the cool-core of the cluster. To investigate its formation and nature, we used archival Chandra and XMM-Newton X-ray data to study the dynamical state of the cluster and detect possible substructures in the hot gas. Its X-ray surface brightness distribution shows…
Multiple Mg II Absorption Systems in the Lines of Sight to Quadruply Lensed Quasar H1413+1143
Minowa, Yosuke; Kashino, Daichi; Kashikawa, Nobunari +6 more
We find multiple Mg II absorption systems at redshift z = 1.66, 2.069, and 2.097 in the spatially resolved spectra of the quadruply gravitationally lensed quasar H1413+1143 utilizing the Kyoto tridimensional spectrograph II (Kyoto 3D II) spectrograph on board the Subaru telescope. Here we present the first measurement of differences in Mg II absor…
A Transient Coronal Sigmoid in Active Region NOAA 11909: Build-up Phase, M-class Eruptive Flare, and Associated Fast Coronal Mass Ejection
Monstein, Christian; Joshi, Bhuwan; Manoharan, P. K. +2 more
In this article, we investigate the formation and disruption of a coronal sigmoid from the active region (AR) NOAA 11909 on 07 December 2013, by analyzing multi-wavelength and multi-instrument observations. Our analysis suggests that the formation of the sigmoid initiated ≈ 1 hour before its eruption through a coupling between two twisted coronal …
Abundance of barium in the atmospheres of red giants in the Galactic globular cluster NGC 104 (47 Tuc)
Korotin, S.; Kučinskas, A.; Kolomiecas, E. +2 more
Context. While most (if not all) Type I Galactic globular clusters (GGCs) are characterised by spreads in the abundances of light chemical elements (e.g. Li, N, O, Na, Mg, Al), it is not yet well established whether similar spreads may exist in s-process elements as well.
Aims: We investigated the possible difference in Ba abundance between t…
Phobos image enhancement using unpaired multi-frame acquisitions from Indian Mars Color Camera
Manthira Moorthi, S.; Misra, Indranil; Rout, Litu +3 more
The Mars Color Camera (MCC) of Indian Space Research Organisation (ISRO) captures the elusive moon of Mars, Phobos. MCC instrument is the eye of Mars Orbiter Mission (MOM) launched by ISRO on 05th November 2013 from the spaceport of India, Sriharikota. MCC has already provided more than 1000 images of Martian surface features covering d…
Processing GOTO data with the Rubin Observatory LSST Science Pipelines I: Production of coadded frames
Ulaczyk, K.; Pallé, E.; Rol, E. +44 more
The past few decades have seen the burgeoning of wide-field, high-cadence surveys, the most formidable of which will be the Legacy Survey of Space and Time (LSST) to be conducted by the Vera C. Rubin Observatory. So new is the field of systematic time-domain survey astronomy; however, that major scientific insights will continue to be obtained usi…
Capturing dual AGN activity and kiloparsec-scale outflows in IRAS 20210+1121
Fiore, F.; Vignali, C.; Piconcelli, E. +8 more
The most standard scenario for the evolution of massive galaxies across cosmic time assumes a correspondence based on the interplay between active galactic nuclei (AGN) feedback, which injects large amounts of energy into the host environment, and galaxy mergers, with their ability to trigger massive star formation events and accretion onto superm…
A Complete 16 µm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions
Rigopoulou, D.; Cortzen, I.; Fazio, G. G. +21 more
We describe a complete, flux-density-limited sample of galaxies at redshift 0.8 < z < 1.3 selected at 16 µm. At the selection wavelength near 8 µm rest, the observed emission comes from both dust heated by intense star formation and active galactic nuclei (AGNs). Fitting the spectral energy distributions (SEDs) of the sample gala…
First star survivors as metal-rich halo stars that experienced supernova explosions in binary systems
Matsuno, Tadafumi; Saitoh, Takayuki R.; Suda, Takuma +2 more
The search for the first stars formed from metal-free gas in the universe is one of the key issues in astronomy because it relates to many fields, such as the formation of stars and galaxies, the evolution of the universe, and the origin of elements. It is not still clear if metal-free first stars can be found in the present universe. These first …