Search Publications
Modeling of Reflective Propagating Slow-mode Wave in a Flaring Loop
Fang, X.; Xia, C.; Van Doorsselaere, T. +2 more
Quasi-periodic propagating intensity disturbances have been observed in large coronal loops in extreme ultraviolet images over a decade, and are widely accepted to be slow magnetosonic waves. However, spectroscopic observations from Hinode/EIS revealed their association with persistent coronal upflows, making this interpretation debatable. We perf…
Spectroscopic constraints on CH3OH formation: CO mixed with CH3OH ices towards young stellar objects
Pontoppidan, K. M.; Blake, G. A.; Boogert, A. C. A. +3 more
The prominent infrared absorption band of solid CO - commonly observed towards young stellar objects (YSOs) - consists of three empirically determined components. The broad `red component' (2136 cm-1, 4.681 µm) is generally attributed to solid CO mixed in a hydrogen-bonded environment. Usually, CO embedded in the abundantly presen…
Origin of the X-ray off-states in Vela X-1
Walter, R.; Manousakis, A.
Context. Vela X-1 is the prototype of the classical super-giant high mass X-ray binary systems. Recent continuous and long monitoring campaigns revealed a large hard X-rays variability amplitude with strong flares and off-states. This activity has been interpreted by invoking clumpy stellar winds and/or magnetic gating mechanisms.
Aims: We in…
Deep Optical Images of Malin 1 Reveal New Features
Infante, Leopoldo; Galaz, Gaspar; Suc, Vincent +4 more
We present Megacam deep optical images (g and r) of Malin 1 obtained with the 6.5 m Magellan/Clay telescope, detecting structures down to ∼28 B mag arcsec-2. In order to enhance galaxy features buried in the noise, we use a noise reduction filter based on the total generalized variation regularizator. This method allows us to detect and…
A new isolated dSph galaxy near the Local Group
Rizzi, L.; Karachentsev, I. D.; Makarova, L. N. +2 more
Observations of the highly isolated dwarf spheroidal galaxy KKs 3 = [KK2000] 03 with the Hubble Space Telescope Advanced Camera for Surveys are presented. We measured the galaxy distance of 2.12 ± 0.07 Mpc using the tip of red giant branch method. The total blue absolute magnitude of the galaxy is estimated as MB = -10.8 mag. We briefly…
Recurrent flares in active region NOAA 11283
Romoli, M.; Vecchio, A.; Pietropaolo, E. +21 more
Context. Flares and coronal mass ejections (CMEs) are solar phenomena that are not yet fully understood. Several investigations have been performed to single out their related physical parameters that can be used as indices of the magnetic complexity leading to their occurrence.
Aims: In order to shed light on the occurrence of recurrent flar…
Analysis of HST/COS spectra of the bare C-O stellar core H1504+65 and a high-velocity twin in the Galactic halo
Rauch, T.; Werner, K.
Recovering star formation histories: Integrated-light analyses vs. stellar colour-magnitude diagrams
Koleva, M.; Alloin, D.; Monelli, M. +12 more
Context. Accurate star formation histories (SFHs) of galaxies are fundamental for understanding the build-up of their stellar content. However, the most accurate SFHs - those obtained from colour-magnitude diagrams (CMDs) of resolved stars reaching the oldest main-sequence turnoffs (oMSTO) - are presently limited to a few systems in the Local Grou…
One Plane for All: Massive Star-forming and Quiescent Galaxies Lie on the Same Mass Fundamental Plane at z ~ 0 and z ~ 0.7
van Dokkum, Pieter G.; Franx, Marijn; Bezanson, Rachel
Scaling relations between galaxy structures and dynamics have been studied extensively for early- and late-type galaxies, both in the local universe and at high redshifts. The abundant differences between the properties of disky and elliptical, or star-forming and quiescent, galaxies seem to be characteristic of the local universe; such clear dist…
Characteristics of ice grains in the Enceladus plume from Cassini observations
Ye, S. -Y.; Dong, Y.; Hill, T. W.
Ice grains in the Enceladus plume have been observed by several Cassini instruments during many Enceladus encounters. In this paper we study the ice grains ranging from less than one nanometer to micrometers in size based on multiple instrument observations. We have analyzed the nanograin data from the E17 and E18 Cassini Plasma Spectrometer (CAPS…