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Coronal Mini-jets in an Activated Solar Tornado-like Prominence
Zhang, Jun; De Pontieu, Bart; Kliem, Bernhard +3 more
High-resolution observations from the Interface Region Imaging Spectrometer reveal the existence of a particular type of small solar jet, which arose singly or in clusters from a tornado-like prominence suspended in the corona. In this study, we perform a detailed statistical analysis of 43 selected mini-jets in the tornado event. Our results show…
The large trans-Neptunian object 2002 TC302 from combined stellar occultation, photometry, and astrometry data
Colas, F.; Mottola, S.; Gutiérrez, P. J. +78 more
Context. Deriving physical properties of trans-Neptunian objects is important for the understanding of our Solar System. This requires observational efforts and the development of techniques suitable for these studies.
Aims: Our aim is to characterize the large trans-Neptunian object (TNO) 2002 TC302.
Methods: Stellar occultat…
High-resolution spectroscopic study of massive blue and red supergiants in Perseus OB1. I. Definition of the sample, membership, and kinematics
Lennon, D. J.; Herrero, A.; Urbaneja, M. A. +5 more
Context. The Perseus OB1 association, including the h and χ Persei double cluster, is an interesting laboratory for the investigation of massive star evolution as it hosts one of the most populous groupings of blue and red supergiants (Sgs) in the Galaxy at a moderate distance and extinction.
Aims: We discuss whether the massive O-type, and b…
Differences and similarities of stellar populations in LAEs and LBGs at z ∼ 3.4-6.8
Boquien, M.; Hernán-Caballero, A.; Arrabal Haro, P. +6 more
Lyman alpha emitters (LAEs) and Lyman break galaxies (LBGs) represent the most common groups of star-forming galaxies at high z, and the differences between their inherent stellar populations (SPs) are a key factor in understanding early galaxy formation and evolution. We have run a set of SP burst-like models for a sample of 1558 sources at 3.4 &…
Constraining the distance to the North Polar Spur with Gaia DR2
Alves, João; Speagle, Joshua S.; Zucker, Catherine +3 more
The North Polar Spur (NPS) is one of the largest structures observed in the Milky Way in both the radio and soft X-rays. While several predictions have been made regarding the origin of the NPS, modelling the structure is difficult without precise distance constraints. In this paper, we determine accurate distances to the southern terminus of the …
New insight into the stellar mass function of Galactic globular clusters
Hilker, M.; Baumgardt, H.; Sollima, A. +2 more
We present the results of the analysis of deep photometric data of 32 Galactic globular clusters. We analysed 69 parallel field images observed with the Wide Field Channel of the Advanced Camera for Surveys of the Hubble Space Telescope which complemented the already available photometry from the globular cluster treasury project covering the cent…
EXTraS discovery of an X-ray superflare from an L dwarf
Stelzer, Beate; Esposito, Paolo; Tiengo, Andrea +13 more
We present the first detection of an X-ray flare from an ultracool dwarf of spectral class L. The event was identified in the EXTraS database of XMM-Newton variable sources, and its optical counterpart, J0331-27, was found through a cross-match with the Dark Energy Survey Year 3 release. Next to an earlier four-photon detection of Kelu-1, J0331-27…
X-ray properties of dust-obscured galaxies with broad optical/UV emission lines
Brandt, William N.; Garmire, Gordon P.; Zou, Fan +4 more
Dust-obscured galaxies (DOGs) with extreme infrared luminosities may represent a key phase in the co-evolution of galaxies and supermassive black holes. We select 12 DOGs at 0.3 ≲ z ≲ 1.0 with broad Mg II or H β emission lines and investigate their X-ray properties utilizing snapshot observations (~3 ks per source) with Chandra. By assuming that t…
Quiet, Discrete Auroral Arcs: Acceleration Mechanisms
Marghitu, O.; Karlsson, T.; Song, Y. +4 more
The theory of the acceleration of auroral particles is reviewed, focusing on developments in the last 15 years. We discuss elementary plasma physics processes leading to acceleration of electrons to energies compatible with emission observed for quiet, discrete auroral arcs, defined as arcs that have time scales of minutes or more and spatial scal…
Dynamical Masses of Young Stars. II. Young Taurus Binaries Hubble 4, FF Tau, and HP Tau/G3
Rizzuto, Aaron C.; Dupuy, Trent J.; Ireland, Michael J. +1 more
One of the most effective ways to test stellar evolutionary models is to measure dynamical masses for binary systems at a range of temperatures. In this paper, we present orbits of three young K+M binary systems in Taurus (Hubble 4, FF Tau, and HP Tau/G3) with very long baseline interferometry parallaxes. We obtained precision astrometry with Keck…