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XMM-Newton study of X-ray sources in the field of Willman 1 dwarf spheroidal galaxy
Sasaki, Manami; Saeedi, Sara
We present the results of the analysis of three XMM-Newton observations of the Willman 1 dwarf spheroidal galaxy (Wil 1). X-ray sources are classified on the basis of spectral analysis, hardness ratios, X-ray-to-optical flux ratio, X-ray variability, and cross-correlation with available catalogues in optical and infrared wavelengths. We catalogued…
Recurrent low-level luminosity behaviour after a giant outburst in the Be/X-ray transient 4U 0115+63
Degenaar, N.; Wijnands, R.; van den Eijnden, J. +4 more
In 2017, the Be/X-ray transient 4U 0115+63 exhibited a new type II outburst that was two times fainter than its 2015 giant outburst (in the Swift/BAT count rates). Despite this difference between the two bright events, the source displayed similar X-ray behaviour after these periods. Once the outbursts ceased, the source did not transit towards qu…
Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey
Mathew, Blesson; Stalin, C. S.; Surdej, Jean +3 more
Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will survey the sky that covers a width of about 27
A systematic study of Galactic infrared bubbles along the Galactic plane with AKARI and Herschel. II. Spatial distributions of dust components around the bubbles
Oyabu, Shinki; Kaneda, Hidehiro; Ishihara, Daisuke +7 more
Galactic infrared (IR) bubbles, which can be seen as shell-like structures at mid-IR wavelengths, are known to possess massive stars within their shell boundaries. In our previous study (Hanaoka, 2019, PASJ, 71, 6), we expanded the research area to the whole Galactic plane (0° ≤ l ≤ 360°, |b| ≤ 5°) and studied systematic differences in the shell m…
Temporal variation of the 3-micron hydrocarbon emissions at the 8-micron north polar hot spot of Jupiter: Comparison with solar wind activity
Kim, Sang Joon; Yung, Yuk L.; Miller, Steve +5 more
We have obtained Gemini/GNIRS 3.3-3.4 µm spectra of Jupiter at 65o North latitude over a range of longitudes roughly centered on the 8-µm CH4 north polar hot spot (8CNPHS). The spectra were measured on four occasions during a four-month period in 2018, in order to search for variability of the 3-µm emissions…
Observability of ultraviolet NI lines in the atmosphere of transiting Earth-like planets
France, Kevin; Cubillos, Patricio E.; Fossati, Luca +5 more
Nitrogen is a biosignature gas that cannot be maintained in its Earth-like ratio with CO2 under abiotic conditions. It has also been proven to be notoriously hard to detect at optical and infrared wavelengths. Fortunately, the ultraviolet region, which has only recently started being explored for terrestrial exoplanets, may provide new …
Enhancing coronal structures with radial local multi-scale filter
Ji, Kaifan; Bai, Xianyong; Liu, Hui +2 more
Images of the corona contain information over a wide range of spatial scales and various structures such as coronal holes, coronal loops, coronal mass ejections (CMEs), and helmet streamers with differences in brightness. Therefore, processing these images is important for determining various types of information. However, it is very difficult to …
Improving homology modeling from low-sequence identity templates in Rosetta: A case study in GPCRs
Bender, Brian Joseph; Marlow, Brennica; Meiler, Jens
CCD Photometry, Light Curve Modeling, and Period Study of the Overcontact Binary Systems NSVS 7245866 and V685 Pegasi
Alton, K. B.
Precise time-series multi-color (B, V, and Ic) light curve data were acquired at UnderOak Observatory (UO) from NSVS 7245866 (2017) and V685 Peg (2016). Prior to this investigation only monochromatic CCD data for both variables were available from automated surveys which employ sparse sampling strategies. Each target produced new times-of-minimum …
Spectroscopic observations of the machine-learning selected anomaly catalogue from the AllWISE Sky Survey
Gromadzki, M.; Thomas, R.; Sani, E. +7 more
We present the results of a programme to search and identify the nature of unusual sources within the All-sky Wide-field Infrared Survey Explorer (WISE) that is based on a machine-learning algorithm for anomaly detection, namely one-class support vector machines (OCSVM). Designed to detect sources deviating from a training set composed of known cl…