Search Publications
Validation scheme for solar coronal models: Constraints from multi-perspective observations in EUV and white light
Temmer, M.; Asvestari, E.; Pomoell, J. +2 more
Context. In this paper, we present a validation scheme to investigate the quality of coronal magnetic field models, which is based on comparisons with observational data from multiple sources.
Aims: Many of these coronal models may use a range of initial parameters that produce a large number of physically reasonable field configurations. How…
SPYGLASS. II. The Multigenerational and Multiorigin Star Formation History of Cepheus Far North
Murphy, Simon J.; Rizzuto, Aaron C.; Kraus, Adam L. +4 more
Young stellar populations provide a record of past star formation, and by establishing their members' dynamics and ages, it is possible to reconstruct the full history of star formation events. Gaia has greatly expanded the number of accessible stellar populations, with one of the most notable recently discovered associations being Cepheus Far Nor…
A Multiwavelength Study of GRS 1716-249 in Outburst: Constraints on Its System Parameters
Soria, Roberto; Gandhi, Poshak; Homan, Jeroen +27 more
We present a detailed study of the evolution of the Galactic black hole transient GRS 1716-249 during its 2016-2017 outburst at optical (Las Cumbres Observatory), mid-infrared (Very Large Telescope), near-infrared (Rapid Eye Mount telescope), and ultraviolet (the Neil Gehrels Swift Observatory Ultraviolet/Optical Telescope) wavelengths, along with…
Identification, mass, and age of primary red clump stars from spectral features derived with the LAMOST DR7
Luo, A. -Li; Chen, Yu-Qin; He, Xu-Jiang
Although red clump (RC) stars are easy to identify due to their stability of luminosity and colour, about 20-50 per cent are actually red giant branch (RGB) stars in the same location on the HR diagram. In this paper, a sample of 210 504 spectra for 184 318 primary RC (PRC) stars from the LAMOST DR7 is identified, which has a purity of higher than…
10 Yr Transformation of the Obscuring Wind in NGC 5548
Gu, Liyi; Kriss, Gerard A.; Mehdipour, Missagh +4 more
A decade ago, the archetypal Seyfert-1 galaxy NGC 5548 was discovered to have undergone major spectral changes. The soft X-ray flux had dropped by a factor of 30 while new broad and blueshifted UV absorption lines appeared. This was explained by the emergence of a new obscuring wind from the accretion disk. Here we report on the striking long-term…
MUSE sneaks a peek at extreme ram-pressure stripping events - V. Towards a complete view of the galaxy cluster A1367
Fumagalli, Michele; Yoshida, Michitoshi; Fossati, Matteo +6 more
We present an analysis of the kinematics and ionization conditions in a sample composed of seven star-forming galaxies undergoing ram-pressure stripping in the A1367 cluster, and the galaxy ESO137-001 in the Norma cluster. MUSE observations of two new galaxies in this sample, CGCG097-073 and CGCG097-079, are also presented. This sample is characte…
J-PLUS: a catalogue of globular cluster candidates around the M 81/M 82/NGC 3077 triplet of galaxies
Chies-Santos, Ana L.; Cenarro, A. Javier; Dupke, Renato +16 more
Globular clusters (GCs) are proxies of the formation assemblies of their host galaxies. However, few studies exist targeting GC systems of spiral galaxies up to several effective radii. Through 12-band Javalambre Photometric Local Universe Survey (J-PLUS) imaging, we study the point sources around the M 81/M 82/NGC 3077 triplet in search of new GC…
Determining the Beaming of Io Decametric Emissions: A Remote Diagnostic to Probe the Io-Jupiter Interaction
Kurth, W. S.; Cecconi, B.; Lamy, L. +8 more
We investigate the beaming of 11 Io-Jupiter decametric (Io-DAM) emissions observed by Juno/Waves, the Nançay Decameter Array, and NenuFAR. Using an up-to-date magnetic field model and three methods to position the active Io Flux Tube (IFT), we accurately locate the radiosources and determine their emission angle θ from the local magnetic field vec…
Prevalence of Thermal Nonequilibrium over an Active Region
Antolin, Patrick; Şahin, Seray
Recent observations have shown that besides the characteristic multimillion degree component, the corona also contains a large amount of cool material called coronal rain, whose clumps are 10-100 times cooler and denser than the surroundings and are often organized in larger events, termed showers. Thermal instability (TI) within a coronal loop in…
Dynamical Star-forming History of Per OB2
Stassun, Keivan G.; Kounkel, Marina; Deng, TingYan
We analyze the internal dynamics of young stars toward Perseus using Gaia EDR3 data, including Per OB2 and California Cloud. Interpreting the current dynamics, we speculate that Per OB2 may have formed from two separate clouds that have begun forming stars in close proximity to each other. IC 348 is caught in the middle between the two of them, in…