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Revealing the nature of central emission nebulae in the dwarf galaxy NGC 185
Ilić, D.; Vučetić, M. M.; Onić, D. +6 more
Aims: In this paper we present new optical observations of the galaxy NGC 185 intended to reveal the status of supernova remnants (SNRs) in this dwarf companion of the Andromeda galaxy. Previously, it was reported that this galaxy hosts one SNR.
Methods: Our deep photometric study with the 2m telescope at Rozhen National Astronomical Obs…
Cosmic biology in perspective
Wickramasinghe, N. C.; Lattanzio, John C.; Tout, Christopher A. +2 more
A series of astronomical observations obtained over the period 1986 to 2018 supports the idea that life is a cosmic rather than a purely terrestrial or planetary phenomenon. These include (1) the detection of biologically relevant molecules in interstellar clouds and in comets, (2) mid-infrared spectra of interstellar grains and the dust from come…
GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds
Pulkkinen, Tuija I.; Raukunen, Osku; Dimmock, Andrew P. +5 more
We study the response of the Earth's magnetosphere to fluctuating solar wind conditions during interplanetary coronal mass ejections (ICMEs) using the Grand Unified Magnetosphere-Ionosphere Coupling Simulation (GUMICS-4). The two ICME events occurred on 15-16 July 2012 and 29-30 April 2014. During the strong 2012 event, the solar wind upstream val…
High-frequency dynamics of an active region moss as observed by IRIS
Van Doorsselaere, Tom; Pant, Vaibhav; Banerjee, Dipankar +1 more
The high temporal, spatial and spectral resolution of Interface Region Imaging Spectrograph (IRIS) has provided new insights into the understanding of different small-scale processes occurring at the chromospheric and transition region (TR) heights. We study the dynamics of high-frequency oscillations of an active region (AR 2376) moss as recorded…
AKARI mission program: Excavating Mass Loss History in extended dust shells of Evolved Stars (MLHES). I. Far-IR photometry†
Yamamura, Issei; Takita, Satoshi; Izumiura, Hideyuki +3 more
We performed a far-IR imaging survey of the circumstellar dust shells of 144 evolved stars as a mission program of the AKARI infrared astronomical satellite using the Far-Infrared Surveyor (FIS) instrument. With this survey, we deliver far-IR surface brightness distributions of roughly 10' × 40' or 10' × 20' areas of the sky around the target evol…
TYC 8606-2025-1: a mild barium star surrounded by the ejecta of a very late thermal pulse
Fossati, L.; Gvaramadze, V. V.; Grebel, E. K. +4 more
We report the discovery of a spiral-like nebula with the Wide-field Infrared Survey Explorer and the results of optical spectroscopy of its associated star TYC 8606-2025-1 with the Southern African Large Telescope. We find that TYC 8606-2025-1 is a G8 III star of ≈ 3 M_{⊙ }, showing a carbon depletion by a factor of 2 and a nitrogen enhancement by…
Spatial Variation of the Chemical Properties of Massive Star-forming Clumps
Zhou, Jianjun; Esimbek, Jarken; He, Yuxin +4 more
We selected 90 massive star-forming clumps with strong N2H+(1-0), HCO+(1-0), HCN(1-0), and HNC(1-0) emission from the Millimetre Astronomy Legacy Team 90 GHz survey. We obtained Herschel data for all 90 sources and NRAO VLA Sky Survey data for 51 of them. We convolved and regridded all images to the same resolution…
Murchison Widefield Array and XMM-Newton observations of the Galactic supernova remnant G5.9+3.1
Haberl, F.; Callingham, J. R.; Filipović, M. D. +27 more
Aims: In this paper we discuss the radio continuum and X-ray properties of the so-far poorly studied Galactic supernova remnant (SNR) G5.9 + 3.1.
Methods: We present the radio spectral energy distribution (SED) of the Galactic SNR G5.9 + 3.1 obtained with the Murchison Widefield Array (MWA). Combining these new observations with the surv…
A classifier to detect elusive astronomical objects through photometry
Vig, S.; Ghosh, S. K.; Bhavana, D. +1 more
The application of machine learning principles in the photometric search of elusive astronomical objects has been a less-explored frontier of research. Here, we have used three methods, the neural network and two variants of k-nearest neighbour, to identify brown dwarf candidates using the photometric colours of known brown dwarfs. We initially ch…
Galactic foreground of gamma-ray bursts from AKARI Far-Infrared Surveyor
Doi, Yasuo; Onishi, Toshikazu; Zahorecz, Sarolta +8 more
We demonstrate the use of the AKARI FIS All-Sky Survey maps in the study of extragalactic objects. A quick but reliable estimate of the Galactic foreground is essential for extragalactic research in general. We explored the galactic foreground and calculated hydrogen column densities using AKARI FIS and other recent all-sky survey data, and compar…