Search Publications
The interaction of the halo around the butterfly planetary nebula NGC 650-1 with the interstellar medium
Guerrero, M. A.; Ramos-Larios, G.; Sabin, L. +7 more
With its bright and wide equatorial waist seen almost edge-on (`the butterfly body') and the faint and broad bipolar extensions (`the butterfly wings'), NGC 650-1 is the archetypical example of bipolar planetary nebula (PN) with butterfly morphology. We present here deep high-resolution broad- and narrow-band optical images that expose the rich an…
Star formation and gas inflows in the OH megamaser galaxy IRAS03056+2034
Robinson, Andrew; Baum, Stefi; Storchi-Bergmann, Thaisa +6 more
We have obtained observations of the OH megamaser galaxy IRAS03056+2034 using the Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Very Large Array (VLA), and Hubble Space Telescope (HST). The HST data reveals spiral arms containing knots of emission associated with star-forming regions. The GMOS-IFU data cover the spectral range…
Plasma density structures at comet 67P/Churyumov-Gerasimenko
Nilsson, H.; Goetz, C.; Henri, P. +7 more
We present a Rosetta Plasma Consortium (RPC) case study based on four events in 2015 autumn at various radial distances, phase angles and local times, just after the perihelion of comet 67P/Churyumov-Gerasimenko. Pulse-like (high-amplitude, up to minutes in time) signatures are seen with several RPC instruments in the plasma density (with the LAng…
The impact of ELT distortions and instabilities on future astrometric observations
Massari, D.; Rodeghiero, G.; Pott, J. -U. +4 more
The paper discusses an assessment study about the impact of the distortions on the astrometric observations with the Extremely Large Telescope originated from the optics positioning errors and telescope instabilities. Optical simulations combined with Monte Carlo approach reproducing typical inferred opto-mechanical and dynamical instabilities sho…
Evolution of the UV upturn in cluster galaxies: Abell 1689
Bremer, M. N.; De Propris, R.; Phillipps, S. +1 more
We have measured the strength of the UV upturn for red sequence galaxies in the Abell 1689 cluster at z = 0.18, reaching to or below the L* level and therefore probing the general evolution of the upturn phenomenon. We find that the range of UV upturn strengths in the population as a whole has not declined over the past 2.2 Gyr. This is consistent…
A VLT/MUSE galaxy survey towards QSO Q1410: looking for a WHIM traced by BLAs in inter-cluster filaments
Prochaska, J. Xavier; Tejos, Nicolas; Barrientos, L. Felipe +7 more
Cosmological simulations predict that a significant fraction of the low-z baryon budget resides in large-scale filaments in the form of a diffuse plasma at temperatures T ∼ 105 - 107 K. However, direct observation of this so-called warm-hot intergalactic medium (WHIM) has been elusive. In the Λcold dark matter paradigm, galax…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XIII. ACS/WFC parallel-field catalogues
Anderson, J.; Milone, A. P.; Bedin, L. R. +12 more
As part of the Hubble Space Telescope UV Legacy Survey of Galactic globular clusters, 110 parallel fields were observed with the Wide Field Channel of the Advanced Camera for Surveys, in the outskirts of 48 globular clusters, plus the open cluster NGC 6791. Totalling about 0.3 deg2 of observed sky, this is the largest homogeneous Hubble…
Spectroscopic orbits of nearby solar-type dwarfs - II.
Tokovinin, A.; Gorynya, N. A.
Several nearby solar-type dwarfs with variable radial velocity were monitored to find their spectroscopic orbits. First orbital elements of 15 binaries (HIP 12144, 17895, 27970, 32329, 38636, 39072, 40479, 43004, 73700, 79234, 84696, 92140, 88656, 104514, and 112222) are determined. The previously known orbits of HIP 5276, 21443, 28678, and 41214 …
On the detection of CO and mass-loss of bulge OH/IR stars
Blommaert, J. A. D. L.; Justtanont, K.; Decin, L. +1 more
We report on the successful search for CO (2-1) and (3-2) emission associated with OH/IR stars in the Galactic bulge. We observed a sample of eight extremely red asymptotic giant branch stars with the Atacama Pathfinder EXperiment telescope and detected seven. The sources were selected at a sufficiently high galactic latitude to avoid interference…
Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560
Sokoloski, J. L.; Knigge, Christian; Lucy, Adrian B.
In symbiotic binaries, jets and disc winds may be integral to the physics of accretion on to white dwarfs from cool giants. The persistent outflow from symbiotic star MWC 560 (≡V694 Mon) is known to manifest as broad absorption lines (BALs), most prominently at the Balmer transitions. We report the detection of high-ionization BALs from C IV, Si I…