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Diffuse X-ray emission around an ultraluminous X-ray pulsar
Wolter, Anna; Pintore, Fabio; Mereghetti, Sandro +17 more
Ultraluminous X-ray sources (ULXs) are extragalactic X-ray emitters located off-centre of their host galaxy and with a luminosity in excess of a few 1039 erg s-1, if emitted isotropically1,2. The discovery of periodic modulation revealed that in some ULXs the accreting compact object is a neutron star3-7…
NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-µm map and catalogue of 850-µm-selected sources over 2 deg2
Hashimoto, Tetsuya; Kim, Seong Jin; Conselice, Christopher J. +27 more
We present an 850-µm mosaic map and extracted catalogue of submillimetre sources in the extended North Ecliptic Pole (NEP) region over about 2 deg2. The 850-µm map is constructed using newly obtained observations by SCUBA-2 at the East Asian Observatory's James Clerk Maxwell Telescope, carried out using the observatory's lar…
44Ti ejecta in young supernova remnants
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +2 more
Context. Tracing unstable isotopes produced in supernova nucleosynthesis provides a direct diagnostic of supernova explosion physics. Theoretical models predict an extensive variety of scenarios, which can be constrained through observations of the abundant isotopes 56Ni and 44Ti. Direct evidence of the latter was previously …
The Importance of Star Formation Intensity in Lyα Escape from Green Pea Galaxies and Lyman Break Galaxy Analogs
Malhotra, Sangeeta; Butler, Nathaniel R.; Yang, Huan +2 more
We have studied ultraviolet images of 40 Green Pea galaxies and 15 local Lyman Break Galaxy Analogs to understand the relation between Lyα photon escape and central UV photometric properties. We measured star-formation intensity (SFI; star formation rate per unit area) from the central 250 pc region ( ${S}_{250\mathrm{pc}}$ ) using Cosmic Origins …
An updated detailed characterization of planes of satellites in the MW and M31
Pawlowski, Marcel S.; Santos-Santos, Isabel M.; Domínguez-Tenreiro, Rosa
We present a detailed characterization of planes of satellite galaxies in the Milky Way (MW) and M31. For a positional analysis, we introduce an extension to the '4-galaxy-normal density plot' method from Pawlowski, Kroupa & Jerjen. It finds the normal directions to the predominant planar configurations of satellites of a system, yielding for …
The search for galaxy cluster members with deep learning of panchromatic HST imaging and extensive spectroscopy
Grillo, C.; Rosati, P.; Vanzella, E. +9 more
Context. The next generation of extensive and data-intensive surveys are bound to produce a vast amount of data, which can be efficiently dealt with using machine-learning and deep-learning methods to explore possible correlations within the multi-dimensional parameter space.
Aims: We explore the classification capabilities of convolution neu…
The chemical nature of the young 120-Myr-old nearby Pisces-Eridanus stellar stream flowing through the Galactic disc
Curtis, Jason; Hawkins, Keith; Lucey, Madeline
Recently, a new cylindrical-shaped stream of stars up to 700 pc long was discovered hiding in the Galactic disc using kinematic data enabled by the Gaia mission. This stream of stars, dubbed Pisces-Eridanus (Psc-Eri), was initially thought to be as old as 1 Gyr, yet its stars shared a rotation period distribution consistent with a population that …
Observability of dusty debris discs around M-stars
Lestrade, Jean-François; Booth, Mark; Krivov, Alexander V. +1 more
Debris discs are second-generation dusty discs formed by collisions of planetesimals. Many debris discs have been found and resolved around hot and solar-type stars. However, only a handful have been discovered around M-stars, and the reasons for their paucity remain unclear. Here, we check whether the sensitivity and wavelength coverage of presen…
Photometric Redshift Estimation with Galaxy Morphology Using Self-organizing Maps
Cooray, Asantha; Häußler, Boris; Nayyeri, Hooshang +1 more
We use multiband optical and near-infrared photometric observations of galaxies in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey to predict photometric redshifts using artificial neural networks. The multiband observations span from 0.39 to 8.0 µm for a sample of ∼1000 galaxies in the GOODS-S field for which robust size …
Stellar X-Ray Activity Across the Hertzsprung-Russell Diagram. I. Catalogs
Liu, Jifeng; Bai, Yu; Wang, Song +1 more
Stellar magnetic activity provides substantial information on the magnetic dynamo and the coronal heating process. We present a catalog of X-ray activity for about 6000 stars, based on the Chandra and Gaia DR2 data. We also classified more than 3000 stars as young stellar objects, dwarf stars, or giant stars. By using the stars with valid stellar …