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A Radiatively Driven Wind from the η Tel Debris Disk
MacGregor, Meredith A.; Weinberger, Alycia J.; Roberge, Aki +5 more
We present far- and near-ultraviolet absorption spectroscopy of the ~23 Myr edge-on debris disk surrounding the A0V star η Telescopii, obtained with the Hubble Space Telescope Space Telescope Imaging Spectrograph. We detect absorption lines from C I, C II, O I, Mg II, Al II, Si II, S II, Mn II, Fe II, and marginally N I. The lines show two clear a…
The case for thermalization as a contributor to the [C II] deficit
Hunt, Leslie K.; Calzetti, Daniela; De Looze, Ilse +15 more
The [C II] deficit, which describes the observed decrease in the ratio of [C II] 158 µm emission to continuum infrared emission in galaxies with high star formation surface densities, places a significant challenge to the interpretation of [C II] detections from across the observable universe. In an attempt to further decode the cause of the…
Influence of Heliolatitudinal Anisotropy of Solar FUV/EUV Emissions on Lyα Helioglow: SOHO/SWAN Observations and WawHelioGlow Modeling
Bzowski, M.; Kubiak, M. A.; Strumik, M.
Observations of the Sun's surface suggest a nonuniform radiated flux as related to the presence of bright active regions and darker coronal holes. The variations of the FUV/EUV source radiation can be expected to affect the Lyα backscatter glow measured by spaceborne instruments. In particular, inferring the heliolatitudinal structure of the solar…
Hunt for extremely eccentric eclipsing binaries
Mašek, M.; Zasche, P.; Henzl, Z.
We report the very first analysis of 27 eclipsing binary systems with high eccentricities that sometimes reach up to 0.8. The orbital periods for these systems range from 1.4 to 37 days, and the median of the sample is 10.3 days. Star CzeV3392 (= UCAC4 623 022784), for example, currently is the eclipsing system with the highest eccentricity (e = 0…
Suppressed cooling and turbulent heating in the core of X-ray luminous clusters RXCJ1504.1-0248 and Abell 1664
McNamara, Brian R.; Fabian, Andrew C.; Sanders, Jeremy S. +3 more
We present the analysis of XMM-Newton observations of two X-ray luminous cool core clusters, RXCJ1504.1-0248 and Abell 1664. The Reflection Grating Spectrometer reveals a radiative cooling rate of $180\pm 40\, \rm M_{\odot }\rm \, yr^{-1}$ and $34\pm 6\, \rm M_{\odot }\rm \, yr^{-1}$ in RXCJ1504.1-0248 and Abell 1664 for gas above 0.7 keV, respect…
Cosmic-ray flux predictions and observations for and with Metis on board Solar Orbiter
Heinzel, P.; Gissot, S.; Sasso, C. +41 more
Context. The Metis coronagraph is one of the remote sensing instruments hosted on board the ESA/NASA Solar Orbiter mission. Metis is devoted to carry out the first simultaneous imaging of the solar corona in both visible light (VL) and ultraviolet (UV). High-energy particles can penetrate spacecraft materials and may limit the performance of the o…
KiDS+VIKING-450: An internal-consistency test for cosmic shear tomography with a colour-based split of source galaxies
Hoekstra, Henk; Kuijken, Konrad; Hildebrandt, Hendrik +3 more
We performed an internal-consistency test of the KiDS+VIKING-450 (KV450) cosmic shear analysis with a colour-based split of source galaxies. Utilising the same measurements and calibrations for both sub-samples, we inspected the characteristics of the shear measurements and the performance of the calibration pipelines. On the modelling side, we ex…
Monitoring the negative polarization in Comet 29P/Schwassmann-Wachmann during quiescence
Kim, Sungsoo S.; Videen, Gorden; Zubko, Evgenij +4 more
During five nights between February 3 and 10, 2021, we monitored the degree of linear polarization in Comet 29P/Schwassmann-Wachmann with the broadband R filter. It is the first polarimetric investigation of this comet measured during a period of quiescent activity. We found a nearly constant negative polarization PQ ≈ -2.1% at α ≈ 9.5°…
AstroSat Study of the Globular Cluster NGC 2298: Probable Evolutionary Scenarios of Hot Horizontal Branch Stars
Sahu, Snehalata; Chung, Chul; Subramaniam, Annapurni +3 more
We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical color-magnitude diagrams (CMDs) are constructed for member stars in combination with Hubble Space Telescope UV Globular Cluster Survey data for the central region and G…
Testing the tidal stripping scenario of ultracompact dwarf galaxy formation by using internal properties
Drinkwater, Michael J.; Liu, Chengze; Côté, Patrick +5 more
We use the hydrodynamical EAGLE simulation to test if ultracompact dwarf galaxies (UCDs) can form by tidal stripping by predicting the ages and metallicities of tidally stripped galaxy nuclei in massive galaxy clusters, and compare these results to compiled observations of age and metallicities of observed UCDs. We further calculate the colours of…