Search Publications
Multiwavelength observations of a metric type-II event
Hillaris, A.; Patsourakos, S.; Nindos, A. +1 more
We have studied a complex metric radio event that originated in a compact flare, observed with the ARTEMIS-JLS radiospectrograph on February 12, 2010. The event was associated with a surge observed at 195 and 304 Å and with a coronal mass ejection observed by instruments on board STEREO A and B near the eastern and western limbs respectively. On t…
Spectral state transitions in Circinus ULX5
Markowitz, Alex; Mondal, Samaresh; De Marco, Barbara +2 more
Context. We performed timing and spectral analyses of multi-epoch Suzaku, XMM-Newton, and NuSTAR observations of the ultraluminous X-ray source (ULX) Circinus ULX5 with the aim of putting constraints on the mass of the central object and the accretion mode operating in this source.
Aims: We investigate whether the source contains a stellar ma…
X-ray emitting structures in the Vela SNR: ejecta anisotropies and progenitor stellar wind residuals
Miceli, M.; Bocchino, F.; Orlando, S. +6 more
Context. The Vela supernova remnant (SNR) shows several ejecta fragments (or shrapnel) protruding beyond the forward shock, which are most likely relics of anisotropies that developed during the supernova (SN) explosion. Recent studies have revealed high Si abundance in two shrapnel (shrapnel A and G), located in opposite directions with respect t…
A detailed understanding of the rotation-activity relationship using the 300 Myr old open cluster NGC 3532
Strassmeier, K. G.; Barnes, S. A.; James, D. J. +2 more
Context. The coeval stars of young open clusters provide insights into the formation of the rotation-activity relationship that elude studies of multi-age field populations.
Aims: We measure the chromospheric activity of cool stars in the 300 Myr old open cluster NGC 3532 in concert with their rotation periods to study the mass-dependent morp…
Using radial velocities to reveal black holes in binaries: A test case
Babusiaux, C.; Dubus, G.; Casares, J. +1 more
Aims: Large radial velocity variations in the LAMOST spectra of giant stars have been used to infer the presence of unseen companions. Some of them have been proposed as possible black hole candidates. We test this selection by investigating the classification of the one candidate that has a known X-ray counterpart (UCAC4 721-037069).
Me…
Clean catalogues of blue horizontal-branch stars using Gaia EDR3
Geier, S.; Pelisoli, I.; Culpan, R.
Context. Blue horizontal-branch stars evolve from low-mass stars that have completed their main-sequence lifetimes and undergone a helium flash at the end of their red-giant phase. As such, blue horizontal-branch stars are very old objects that can be used as markers in studies of the Galactic structure and formation history. To create a clean sky…
EMISSA (Exploring Millimeter Indicators of Solar-Stellar Activity). I. The initial millimeter-centimeter main-sequence star sample
Mohan, A.; Hauschildt, P. H.; Wedemeyer, S. +2 more
Context. Due to their wide wavelength coverage across the millimeter to centimeter (mm-cm) range and their increased sensitivity, modern interferometric arrays facilitate observations of the thermal and non-thermal radiation that is emitted from different layers in the outer atmospheres of stars.
Aims: We study the spectral energy distributio…
The OTELO survey as a morphological probe. Last ten Gyr of galaxy evolution. The mass-size relation up to z = 2
Gallego, Jesús; Sánchez-Portal, Miguel; Pintos-Castro, Irene +14 more
Context. The morphology of galaxies provide us with a unique tool for relating and understanding other physical properties and their changes over the course of cosmic time. It is only recently that we have been afforded access to a wealth of data for an unprecedented number galaxies thanks to large and deep surveys.
Aims: We present the morph…
Widespread occurrence of high-velocity upflows in solar active regions
Baker, D.; Brooks, D. H.; Yardley, S. L.
Aims: We performed a systematic study of 12 active regions (ARs) with a broad range of areas, magnetic fluxes, and associated solar activity in order to determine whether there are upflows present at the AR boundaries and, if these upflows exist, whether there is a high-speed asymmetric blue wing component present in them.
Methods: To id…
Molecular gas budget and characterization of intermediate-mass star-forming galaxies at z ≈ 2-3
Dahle, H.; Rigby, J. R.; Sharon, K. +9 more
Star-forming galaxies (SFGs) with stellar masses below 1010 M⊙ make up the bulk of the galaxy population at z > 2. The properties of the cold gas in these galaxies can only be probed in very deep observations or by targeting strongly lensed galaxies. Here we report the results of a pilot survey using the Atacama Compact Ar…