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Low surface brightness galaxies in z > 1 galaxy clusters: HST approaching the progenitors of local ultra diffuse galaxies
Muzzin, Adam; Brammer, Gabriel; van der Burg, Remco F. J. +2 more
Ultra diffuse galaxies (UDGs) are a type of large low surface brightness (LSB) galaxies with particularly large effective radii (reff > 1.5 kpc) that are now routinely studied in the Local (z < 0.1) Universe. While they are found to be abundant in clusters, groups, and in the field, their formation mechanisms remain elusive and co…
Photospheric downflows observed with SDO/HMI, HINODE, and an MHD simulation
Malherbe, J. M.; Roudier, T.; Ballot, J. +3 more
Downflows on the solar surface are suspected to play a major role in the dynamics of the convection zone, at least in its outer part. We investigate the existence of the long-lasting downflows whose effects influence the interior of the Sun but also the outer layers. We study the sets of Dopplergrams and magnetograms observed with Solar Dynamics O…
Stellar, Gas, and Dust Emission of Star-forming Galaxies out to z ∼ 2
Gronwall, Caryl; Ciardullo, Robin; Bowman, William P. +1 more
While dust is a major player in galaxy evolution, its relationship with gas and stellar radiation in the early universe is still not well understood. We combine 3D-Hubble Space Telescope emission-line fluxes with far-UV through far-IR photometry in a sample of 669 emission-line galaxies (ELGs) between 1.2 < z < 1.9 and use the MCSED spectral…
Multi-Point Observation of Hiss Emerging From Lightning Whistlers
Gurnett, Donald A.; Pickett, Jolene S.; Santolík, Ondřej +1 more
We analyze continuous multi-point measurements of electromagnetic field waveforms onboard the Cluster spacecraft in order to contribute to the discussion on sources of plasmaspheric hiss, known as a shaping agent for the Earth radiation belts. In our case study we aim at finding sources of hiss observed close to the geomagnetic equator in the oute…
Variable oxygen emission from the accretion disk of Mrk 110
Grosso, N.; Porquet, D.; Reeves, J. N. +2 more
Six XMM-Newton observations of the bright narrow line Seyfert 1, Mrk 110, from 2004-2020, are presented. The analysis of the grating spectra from the Reflection Grating Spectrometer (RGS) reveals a broad component of the He-like Oxygen (O VII) line, with a full width at half maximum of 15 900 ± 1800 km s−1 measured in the mean spectrum.…
V680 Mon - a young mercury-manganese star in an eclipsing heartbeat system
Vaňko, Martin; Paunzen, Ernst; Hümmerich, Stefan +3 more
Chemically peculiar stars in eclipsing binary systems are rare objects that allow the derivation of fundamental stellar parameters and important information on evolutionary status and the origin of the observed chemical peculiarities. Here we present an investigation of the known eclipsing binary system BD+09 1467 = V680 Mon. Using spectra from th…
A deep XMM-Newton observation of the X-Persei-like binary system CXOU J225355.1+624336
Sidoli, L.; Esposito, P.; La Palombara, N. +2 more
We report on the follow-up XMM-Newton observation of the persistent X-ray pulsar CXOU J225355.1+624336, which was discovered with the CATS@BAR project on archival Chandra data. The source was detected at fX(0.5−10 keV) = 3.4 × 10−12 erg cm−2 s−1, a flux level that is fully consistent with previous observ…
Point spread function reconstruction of adaptive-optics imaging: meeting the astrometric requirements for time-delay cosmography
Treu, Tommaso; Fassnacht, Christopher D.; Chen, Geoff C. -F. +3 more
Astrometric precision and knowledge of the point spread function are key ingredients for a wide range of astrophysical studies including time-delay cosmography in which strongly lensed quasar systems are used to determine the Hubble constant and other cosmological parameters. Astrometric uncertainty on the positions of the multiply-imaged point so…
Magnetotail Processes
Khotyaintsev, Yuri; Runov, Andrei; Birn, Joachim
A Deep Census of Outlying Star Formation in the M101 Group
Mihos, J. Christopher; Harding, Paul; Watkins, Aaron E. +1 more
We present deep, narrowband imaging of the nearby spiral galaxy M101 and its group environment to search for star-forming dwarf galaxies and outlying H II regions. Using the Burrell Schmidt telescope, we target the brightest emission lines of star-forming regions, Hα, Hβ, and [O III], to detect potential outlying star-forming regions. Our survey c…