Search Publications
Discovery of a diffuse optical line emitting halo in the core of the Centaurus cluster of galaxies: line emission outside the protection of the filaments
Fabian, A. C.; Combes, F.; Salomé, P. +6 more
We present the discovery of diffuse optical line emission in the Centaurus cluster seen with the MUSE (Multi Unit Spectroscopic Explorer) integral field unit. The unparalleled sensitivity of MUSE allows us to detect the faint emission from these structures which extend well beyond the bounds of the previously known filaments. Diffuse structures (e…
Towards an informed quest for accretion disc winds in quasars: the intriguing case of Ton 28
Nardini, E.; Lusso, E.; Bisogni, S.
We report on the detection of a blueshifted Fe K absorption feature in two consecutive XMM-Newton observations of the luminous blue quasar Ton 28, at the 4σ cumulative significance. The rest energy of 9.2 keV implies the presence of an accretion disc wind with bulk outflow velocity of ∼0.28c, while the kinetic power is most likely a few per cent o…
Formation of disc galaxies around z ∼ 2
Sachdeva, Sonali; Gogoi, Rupjyoti; Saha, Kanak +2 more
We present combined evolution of morphological and stellar properties of galaxies on the two sides of z = 2 (2.0 < z < 4.0 and 1.5 < z < 2.0) in CDFS, with ground-based spectroscopic redshifts. We perform bulge-disc decomposition on their images in J and H filters, from the 3DHST Legacy Survey obtained using HST/WFC3. Combining morphol…
Investigation of the globular cluster NGC 2808 with the Ultra-Violet Imaging Telescope
Vig, S.; Ghosh, S. K.; Jain, Rashi
Globular clusters represent stellar laboratories where observations can be used to validate models of stellar evolution. In this study, we put forth new ultraviolet (UV) photometric results of stars in the Galactic globular cluster NGC 2808. NGC 2808 is known to host multiple stellar populations that include at least four distinct groups of horizo…
Investigating the origin of the faint non-thermal emission of the Arches cluster using the 2015-2016 NuSTAR and XMM-Newton X-ray observations
Mori, Kaya; Zhang, Shuo; Tomsick, John +7 more
Recent NuSTAR and XMM-Newton observations of the molecular cloud around the Arches stellar cluster demonstrate a dramatic change both in morphology and intensity of its non-thermal X-ray emission, similar to that observed in many molecular clouds of the Central Molecular Zone at the Galactic Center. These variations trace the propagation of illumi…
Multiwavelength spectroscopy of the black hole candidate MAXI J1813-095 during its discovery outburst
De Marco, B.; Armas Padilla, M.; Jiménez-Ibarra, F. +5 more
MAXI J1813-095 is an X-ray transient discovered during an outburst in 2018. We report on X-ray and optical observations obtained during this event, which indicate that the source is a new low-mass X-ray binary. The outburst lasted ∼70 d and peaked at LX(0.5-10 keV) ∼ 7.6 × 1036 erg s-1, assuming a distance of 8 kpc…
T Tauri stars in the SuperWASP and NSVS surveys
Paunzen, E.; Smalley, B.; Vaňko, M. +1 more
We present a study of the long-term optical variability of young T Tauri stars using previously unpublished data from the Super-Wide Angle Search for Planets (SuperWASP) project. Other publicly available photometry from the Northern Sky Variability Survey (NSVS) and the National Aeronautics and Space Administration (NASA) K2 mission were used to c…
Estimation of singly transiting K2 planet periods with Gaia parallaxes
Jordán, Andrés; Espinoza, Néstor; Brahm, Rafael +1 more
When a planet is only observed to transit once, direct measurement of its period is impossible. It is possible, however, to constrain the periods of single transiters, and this is desirable as they are likely to represent the cold and far extremes of the planet population observed by any particular survey. Improving the accuracy with which the per…
The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
Neumayer, Nadine; Georgiev, Iskren Y.; Baumgardt, Holger +11 more
We analyse high spatial resolution near infrared (NIR) imaging of NGC 6384, a Milky Way like galaxy, using ARGOS commissioning data at the Large Binocular Telescope (LBT). ARGOS provides a stable PSFFWHM = 0{^''.}2-0{^''.}3 AO correction of the ground layer across the LUCI 2 NIR camera 4 × 4 arcmin field by using s…
Chandra and Hubble Space Telescope observations of dark gamma-ray bursts and their host galaxies
Lyman, J. D.; Fruchter, A. S.; Perley, D. A. +8 more
We present a study of 21 dark gamma-ray burst (GRB) host galaxies, predominantly using X-ray afterglows obtained with the Chandra X-Ray Observatory (CXO) to precisely locate the burst in deep Hubble Space Telescope (HST) imaging of the burst region. The host galaxies are well-detected in F160W in all but one case and in F606W imaging in 60 per cen…