Search Publications
Evidence for Amazonian highly viscous lavas in the southern highlands on Mars
Hauber, Ernst; Brož, Petr; Platz, Thomas +1 more
We have identified small-scale volcanic edifices, two cones and three domes with associated flows, within Terra Sirenum, a region situated in the martian southern highlands. Based on thermal, morphological, and morphometrical properties, and the determination of absolute model ages, we conclude that these features were formed by volcanic activity …
Spectroscopic Signatures Related to a Sunquake
Green, L. M.; Harra, L. K.; Matthews, S. A. +1 more
The presence of flare-related acoustic emission (sunquakes (SQs)) in some flares, and only in specific locations within the flaring environment, represents a severe challenge to our current understanding of flare energy transport processes. In an attempt to contribute to understanding the origins of SQs we present a comparison of new spectral obse…
Spatial Distribution of X-Ray Emitting Ejecta in Tycho’s SNR: Indications of Shocked Titanium
Troja, E.; Miceli, M.; Orlando, S. +1 more
Young supernova remnants (SNRs) show characteristic ejecta-dominated X-ray emission that allows us to probe the products of explosive nucleosynthesis processes and to ascertain important information about the physics of supernova explosions. Hard X-ray observations have recently revealed the presence of the radioactive decay lines of 44…
Climbing the cosmic ladder with stellar twins
Gilmore, G.; Soubiran, C.; Jofré, P. +3 more
Distances to stars are key to revealing a three-dimensional view of the Milky Way, yet their determination is a major challenge in astronomy. Whilst the brightest nearby stars benefit from direct parallax measurements, fainter stars are subject of indirect determinations with uncertainties exceeding 30 per cent. We present an alternative approach …
Toward Precision Photometry for the ELT Era: The Double Subgiant Branch of NGC 1851 Observed with the Gemini/GeMS MCAO System
Stetson, P. B.; Bono, G.; Fiorentino, G. +4 more
The Extremely Large Telescopes currently under construction have a collecting area that is an order of magnitude larger than the present largest optical telescopes. For seeing-limited observations the performance will scale as the collecting area, but with the successful use of adaptive optics (AO), for many applications it will scale as D4
Carbon monoxide short term variability observed on Venus with SOIR/VEX
Vandaele, A. C.; Robert, S.; Wilquet, V. +3 more
The SOIR instrument on board the ESA Venus Express mission has been operational since the insertion of the satellite around Venus in 2006. Since then, it has delivered high quality spectra of the atmosphere of Venus. Spectra are recorded in the IR spectral region (2.2-4.3 µm) using the solar occultation geometry and give access to a vast num…
Morphological evolution in situ: disc-dominated cluster red sequences at z ∼ 1.25
De Propris, Roberto; Phillipps, Steven; Bremer, Malcolm N.
We have carried out a joint photometric and structural analysis of red sequence galaxies in four clusters at a mean redshift of <z> ∼ 1.25 using optical and near-infrared Hubble Space Telescope imaging reaching to at least three magnitudes fainter than M*. As expected, the photometry and overall galaxy sizes imply purely passive evolution of…
A Measurement of Diffusion in 47 Tucanae
Richer, Harvey B.; Heyl, Jeremy; Kalirai, Jason +4 more
Using images from the Hubble Space Telescope Wide-Field Camera 3, we measure the rate of diffusion of stars through the core of the globular cluster 47 Tucanae (47 Tuc) using a sample of young white dwarfs that were identified in these observations. This is the first direct measurement of diffusion due to gravitational relaxation. We find that the…
Limits on the fluctuating part of y-type distortion monopole from Planck and SPT results
Khatri, Rishi; Sunyaev, Rashid
We use the published Planck and SPT cluster catalogs [1,2] and recently published y-distortion maps [3] to put strong observational limits on the contribution of the fluctuating part of the y-type distortions to the y-distortion monopole. Our bounds are 5.4× 10-8 < ⟨ y⟩ < 2.2× 10-6. Our upper bound is a factor of 6.8 st…
A GALEX-based Search for the Sparse Young Stellar Population in the Taurus-Aurigae Star Forming Region
Gómez de Castro, Ana I.; López-Martínez, Fatima; Sánchez, Néstor +5 more
In this work, we identify 63 bona fide new candidates to T Tauri stars (TTSs) in the Taurus-Auriga region, using its ultraviolet excess as our baseline. The initial data set was defined from the GALEX all sky survey (AIS). The GALEX satellite obtained images in the near-ultraviolet (NUV) and far-ultraviolet (FUV) bands where TTSs show a prominent …