Search Publications
An Unbiased CO Survey toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. I. Overview: CO Cloud Distributions
Tokuda, Kazuki; Tachihara, Kengo; Kawamura, Akiko +15 more
We have analyzed the data from a large-scale CO survey toward the northern region of the Small Magellanic Cloud (SMC) obtained with the Atacama Compact Array (ACA) stand-alone mode of ALMA. The primary aim of this study is to comprehensively understand the behavior of CO as an H2 tracer in a low-metallicity environment (Z ~ 0.2 Z ⊙…
The CARMENES search for exoplanets around M dwarfs. Spectroscopic orbits of nine M-dwarf multiple systems, including two triples, two brown dwarf candidates, and one close M-dwarf-white dwarf binary
Amado, P. J.; Caballero, J. A.; Pallé, E. +33 more
Context. M dwarfs are ideal targets for the search of Earth-size planets in the habitable zone using the radial velocity method, and are attracting the attention of many ongoing surveys. One of the expected results of these surveys is that new multiple-star systems have also been found. This is the case also for the CARMENES survey, thanks to whic…
The LOFAR Two-metre Sky Survey Deep Fields. A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region
Bondi, M.; Prandoni, I.; Wang, L. +14 more
We have exploited LOFAR deep observations of the Lockman Hole field at 150 MHz to investigate the relation between the radio luminosity of star-forming galaxies (SFGs) and their star-formation rates (SFRs), as well as its dependence on stellar mass and redshift. The adopted source classification, SFRs, and stellar masses are consensus estimates ba…
On the Occurrence of Type IV Solar Radio Bursts in Solar Cycle 24 and Their Association with Coronal Mass Ejections
Kilpua, E. K. J.; Kumari, Anshu; Morosan, D. E.
Solar activities, in particular coronal mass ejections (CMEs), are often accompanied by bursts of radiation at meter wavelengths. Some of these bursts have a long duration and extend over a wide frequency band, namely, type IV radio bursts. However, the association of type IV bursts with CMEs is still not well understood. In this article, we perfo…
Mid-infrared Period-Luminosity Relations for Miras in the Large Magellanic Cloud
Soszyński, Igor; Kozłowski, Szymon; Iwanek, Patryk
We present the mid-infrared (mid-IR) period-luminosity relations (PLRs) using over 1000 Mira variables in the Large Magellanic Cloud, for the four Wide-field Infrared Survey Explorer and the four Spitzer bands. These PLRs cover a mid-IR wavelength range from 3.4-22 µm and are presented separately for the oxygen-rich (O-rich) and carbon-rich …
Yet another test of Radial Acceleration Relation for galaxy clusters
Desai, Shantanu; Pradyumna, S.; Gupta, Sajal +1 more
We carry out a test of the radial acceleration relation (RAR) for galaxy clusters from two different catalogs compiled in literature, as an independent cross-check of two recent analyses, which reached opposite conclusions. The datasets we considered include a Chandra sample of 12 clusters and the X-COP sample of 12 clusters. For both the samples,…
The Gaia-ESO survey: a lithium depletion boundary age for NGC 2232
Gilmore, G.; Bayo, A.; Franciosini, E. +17 more
Astrometry and photometry from Gaia and spectroscopic data from the Gaia-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialized spectral line analysis procedure was used to recover the signature of undepleted lithium in very low luminosity cluster members. An age of 38 ± 3 Myr is inf…
Observational Signatures of Cosmic-Ray Interactions in Molecular Clouds
Wu, Kinwah; Lai, Shih-Ping; On, Alvina Y. L. +1 more
We investigate ionization and heating of gas in the dense, shielded clumps/cores of molecular clouds bathed by an influx of energetic, charged cosmic rays (CRs). These molecular clouds have complex structures, with substantial variation in their physical properties over a wide range of length scales. The propagation and distribution of CRs is thus…
BO Ceti: Dwarf nova showing both IW And-type and SU UMa-Type features
Monard, Berto; Tampo, Yusuke; Kato, Taichi +13 more
IW And stars are a recently recognized subgroup of dwarf novae which are characterized by (often repetitive) slowly rising standstills terminated by brightening, but the exact mechanism for this variation is not yet identified. We have identified BO Cet, which had been considered as a novalike cataclysmic variable, as a new member of IW And stars …
Non-LTE inversions of a confined X2.2 flare. I. The vector magnetic field in the photosphere and chromosphere
Leenaarts, J.; Pomoell, J.; Price, D. J. +7 more
Context. Obtaining an accurate measurement of magnetic field vector in the solar atmosphere is essential for studying changes in field topology during flares and reliably modelling space weather.
Aims: We tackle this problem by applying various inversion methods to a confined X2.2 flare that occurred in NOAA AR 12673 on 6 September 2017 and c…