Search Publications
Likelihood of the sky. Bayesian treatment of the geometric two-catalog matching problem
Schmitt, J. H. M. M.; Salvato, M.; Buchner, J. +4 more
Catalogs with celestial positions and uncertainties are among the primary data products of observational astronomy. Consequently, the (cross-)matching problem, namely, the question of how many (and which) pairs of positions pertain to the same celestial source, remains a central part of this scientific exploitation. We address the matching problem…
Identification of large equivalent width dusty galaxies at 4 < z < 6 from sub-millimetre colours
Buat, V.; Boquien, M.; Burgarella, D. +8 more
Context. Infrared (IR), sub-millimetre (sub-mm), and millimetre (mm) databases contain a huge quantity of high-quality data. However, a large part of these data are photometric, and they are thought not to be useful to derive quantitative information on the nebular emission of galaxies.
Aims: The aim of this project is first to identify galax…
Star clusters in tidal debris
Gallagher, Sarah C.; Gronwall, Caryl; Trancho, Gelys +13 more
We present results of a Hubble Space Telescope (HST) UBVI-band study of star clusters in tidal tails, using new WFC3 and ACS imaging to complement existing WFPC2 data. We survey 12 tidal tails across seven merging systems, deriving ages and masses for 425 star cluster candidates (SCCs). The stacked mass distribution across all systems follows a po…
Gaia Focused Product Release: Spatial distribution of two diffuse interstellar bands
Prusti, T.; Mazeh, T.; Zucker, S. +402 more
Diffuse interstellar bands (DIBs) are absorption features seen in optical and infrared spectra of stars and extragalactic objects that are probably caused by large and complex molecules in the galactic interstellar medium (ISM). Here we investigate the Galactic distribution and properties of two DIBs identified in almost six million stellar spectr…
Multi-point study of the energy release and impulsive CME dynamics in an eruptive C7 flare
Krucker, Säm; Veronig, Astrid M.; Podladchikova, Tatiana +6 more
Context. The energy release in eruptive flares and the kinematics of the associated coronal mass ejections (CMEs) are interlinked and require favorable observing positions as both on-disk and off-limb signatures are necessary to characterize these events.
Aims: We combine observations from different vantage points to perform a detailed study …
Sustained Heating of the Chromosphere and Transition Region Over a Sunspot Light Bridge
Mathew, Shibu K.; Louis, Rohan E.; Beck, Christian +2 more
Sunspot light bridges (LBs) exhibit a wide range of short-lived phenomena in the chromosphere and transition region. In contrast, we use here data from the Multi-Application Solar Telescope (MAST), the Interface Region Imaging Spectrograph (IRIS), Hinode, the Atmospheric Imaging Assembly (AIA), and the Helioseismic and Magnetic Imager (HMI) to ana…
Lateral Confinement and the Remarkably Self-similar Nature of Coronal Pseudostreamer Mass Ejections
Hess, P.; Wang, Y. -M.
Coronal mass ejections (CMEs) that originate from pseudostreamers, which separate coronal holes of the same magnetic polarity, are characterized by a narrow (~5°-30°), fan-shaped appearance in white-light coronagraph images. Despite this striking morphological similarity, a wide variety of underlying eruptions are observed, including not only coro…
The possible evolution of pitch angles of spiral galaxies
Reshetnikov, V. P.; Marchuk, A. A.; Mosenkov, A. V. +2 more
Aims: The origin and maintenance of spiral structure in galaxies, the correlation between different types of spiral structure and several proposed mechanisms for their generation, and the evolution of spiral arms of galaxies with time are questions that are still controversial. In this note we study the spiral structure in a sample of distant…
Explosive Events in the Quiet Sun Near and Beyond the Solar Limb Observed with the Interface Region Imaging Spectrograph (IRIS)
Vial, J. -C.; Alissandrakis, C. E.
We study point-like explosive events (EE), characterized by emission in the far wings of spectral lines, in a quiet region near the South Pole, using Interface Region Imaging Spectrograph (IRIS) spectra at two slit positions, slit-jaw (SJ) observations, and Atmospheric Imaging Assembly (AIA) images. The events were best visible in Si IV spectra; t…
The star in RNO 54: A possible post-FUor with a short faint jet
Moiseev, A. V.; Magakian, T. Yu.; Movsessian, T. A. +2 more
Aims: The aim of the present study is to analyze the spectra of an unusual pre-main sequence star in the cometary nebula RNO 54, which is suspected by several researchers to be a FUori-like object.
Methods: We performed long-slit spectroscopy of the star using the 6m telescope with the SCORPIO-2 multi-mode focal reducer.
Results: We…