Search Publications
Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC 10
Lebouteiller, V.; Madden, S. C.; Galliano, F. +9 more
Context. Star formation activity is an important driver of galaxy evolution and is influenced by the physical properties of the interstellar medium. Dwarf galaxies allow us to understand how the propagation of radiation and the physical conditions of the different ISM phases are affected by the low-metallicity environment.
Aims: Our objective…
Terrestrial ion escape and relevant circulation in space
Yamauchi, Masatoshi
Observations of the terrestrial ion escape to space and the transport of escaping ions in the magnetosphere are reviewed, with the main stress on subjects that were not covered in reviews over past 2 decades, during which Cluster has significantly improved our knowledge of them. Here, outflowing ions from the ionosphere are classified in terms of …
Collimated radiation in SS 433. Constraints from spatially resolved optical jets and Cloudy modeling of the optical bullets
Dexter, Jason; Waisberg, Idel; Dubus, Guillaume +2 more
Context. The microquasar SS 433 is well known for its precessing, relativistic, and highly collimated baryonic jets, which manifest in its optical spectrum as pairs of hydrogen and helium emission lines moving with large Doppler shifts. Depending on their heating mechanism, the optical jet bullets may serve as a probe of the collimated radiation c…
Young stellar populations in early-type dwarf galaxies. Occurrence, radial extent, and scaling relations
Peletier, R. F.; Valentijn, E. A.; Hamraz, E. +3 more
Aims: To understand the stellar population content of early-type dwarf galaxies (dEs) and their environmental dependence, we compare the slopes and intrinsic scatter of color-magnitude relations (CMRs) for three nearby clusters, Fornax, Virgo, and Coma. Additionally, we present and compare internal color profiles of these galaxies to identify…
Spin Parity of Spiral Galaxies. I. Corroborative Evidence for Trailing Spirals
Tadaki, Ken-ichi; Iye, Masanori; Fukumoto, Hideya
Whether the spiral structure of galaxies is trailing or leading has been a subject of debate. We present a new spin parity catalog of 146 spiral galaxies that lists the following three pieces of information: whether the spiral structure observed on the sky is S-wise or Z-wise; which side of the minor axis of the galaxy is darker and redder, based …
Massive dust clumps in the envelope of the red supergiant VY Canis Majoris
Kamiński, T.
The envelope of the red supergiant VY CMa has long been considered an extreme example of episodic mass loss that is possibly taking place in other cool and massive evolved stars. Recent (sub-)millimeter observations of the envelope revealed the presence of massive dusty clumps within 800 mas of the star and reinforce the picture of drastic mass-lo…
Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
Reichart, D. E.; Wang, L.; Knigge, C. +21 more
We present high-time-resolution photometry and phase-resolved spectroscopy of the short-period ({P_orb}= 80.52 min) cataclysmic variable SDSS J123813.73-033933.0, observed with the Hubble Space Telescope (HST), the Kepler/K2 mission, and the Very Large Telescope (VLT). We also report observations of the first detected superoutburst. SDSS J1238-033…
Variable dust emission by WC type Wolf-Rayet stars observed in the NEOWISE-R survey
Williams, P. M.
Photometry at 3.4 and 4.6 {µ m} of 128 Population I WC type Wolf-Rayet stars in the Galaxy and 12 in the Large Magellanic Cloud (LMC) observed in the WISE NEOWISE-R survey was searched for evidence of circumstellar dust emission and its variation. Infrared spectral energy distributions (SEDs) were assembled, making use of archival r, i, Z, a…
Manifestations of Three-dimensional Magnetic Reconnection in an Eruption of a Quiescent Filament: Filament Strands Turning to Flare Loops
Aulanier, Guillaume; Dudík, Jaroslav; Lörinčík, Juraj
We report on observations of the conversion of bright filament strands into flare loops during the 2012 August 31 filament eruption. Prior to the eruption, individual bright strands composing one of the legs of the filament were observed in the 171 Å filter channel data of the Atmospheric Imaging Assembly. After the onset of the eruption, one of t…
Nature of a shell of young stars in the outskirts of the Small Magellanic Cloud
Bell, Eric F.; Carballo-Bello, Julio A.; Grebel, Eva K. +36 more
Context. Understanding the evolutionary history of the Magellanic Clouds requires an in-depth exploration and characterization of the stellar content in their outer regions, which ultimately are key to tracing the epochs and nature of past interactions.
Aims: We present new deep images of a shell-like overdensity of stars in the outskirts of …