Search Publications
Catching jetted tidal disruption events early in millimetre
Yuan, Qiang; Wang, Q. Daniel; Zhang, Bing +2 more
Relativistic jets can form from at least some tidal disruption events (TDEs) of (sub-)stellar objects around supermassive black holes. We detect the millimetre (MM) emission of IGR J12580+0134 - the nearest TDE known in the galaxy NGC 4845 at the distance of only 17 Mpc, based on Planck all-sky survey data. The data show significant flux jumps aft…
Distinguishing disks from mergers: Tracing the kinematic asymmetries in local (U)LIRGs using kinemetry-based criteria
Arribas, Santiago; Colina, Luis; Bellocchi, Enrica
Context. The kinematic characterization of different galaxy populations is a key observational input for distinguishing between different galaxy evolutionary scenarios because it helps to determine the number ratio of rotating disks to mergers at different cosmic epochs. Local (ultra) luminous infrared galaxies ((U)LIRGs) cover similar range of st…
To v∞ and beyond! The He I absorption variability across the 2014.6 periastron passage of η Carinae
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +11 more
We have monitored the massive binary star η Carinae with the CTIO/Small and Moderate Aperture Research Telescope System 1.5 m telescope and CHIRON spectrograph from the previous apastron passage of the system through the recent 2014.6 periastron passage. Our monitoring has resulted in a large, homogeneous data set with an unprecedented time-sampli…
Imprint of inhomogeneous and anisotropic primordial power spectrum on CMB polarization
Ghosh, Shamik; Kothari, Rahul; Jain, Pankaj +2 more
We consider an inhomogeneous model and independently an anisotropic model of primordial power spectrum in order to describe the observed hemispherical anisotropy in cosmic microwave background radiation (CMBR). This anisotropy can be parametrized in terms of the dipole modulation model of the temperature field. Both the models lead to correlations…
Determining Type Ia Supernova Host Galaxy Extinction Probabilities and a Statistical Approach to Estimating the Absorption-to-reddening Ratio RV
Marleau, Francine; Deustua, Susana; Cikota, Aleksandar
We investigate limits on the extinction values of Type Ia supernovae (SNe Ia) to statistically determine the most probable color excess, E(B - V), with galactocentric distance, and use these statistics to determine the absorption-to-reddening ratio, RV, for dust in the host galaxies. We determined pixel-based dust mass surface density m…
The Circum-Galactic Medium of MASsive Spirals. I. An Overview and a Case Study of NGC 5908
Bregman, Joel N.; Anderson, Michael E.; Crain, Robert A. +2 more
The Circum-Galactic Medium of MASsive Spirals is a project studying the overall content, physical and chemical properties, and spatial distributions of the multi-phase circumgalactic medium around a small sample of the most massive ({M}* ≳ 2× {10}11 {M}⊙ , {v}{rot}\gt 300 {km} {{{s}}}-1) isola…
Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph
Johnson, Christian I.; Mateo, Mario; Frank, Matthias J. +4 more
The globular cluster H4, located in the center of the Fornax dwarf spheroidal galaxy, is crucial for understanding the formation and chemical evolution of star clusters in low-mass galactic environments. H4 is peculiar because the cluster is significantly more metal-rich than the galaxy's other clusters, is located near the galaxy center, and may …
GeMS/GSAOI Photometric and Astrometric Performance in Dense Stellar Fields
Dalessandro, E.; Saracino, S.; Marchetti, E. +7 more
Ground-based imagers at 8 m class telescopes assisted by multi-conjugate adaptive optics are primary facilities with which to obtain accurate photometry and proper motions in dense stellar fields. We observed the central region of the globular clusters Liller 1 and NGC 6624 with the Gemini Multi-conjugate Adaptive Optics System (GeMS) feeding the …
Time-dependent tomographic reconstruction of the solar corona
Lamy, P.; Vibert, D.; Peillon, C. +2 more
Solar rotational tomography (SRT) applied to white-light coronal images observed at multiple aspect angles has been the preferred approach for determining the three-dimensional (3D) electron density structure of the solar corona. However, it is seriously hampered by the restrictive assumption that the corona is time-invariant which introduces sign…
Discovery of Ubiquitous Fast-Propagating Intensity Disturbances by the Chromospheric Lyman Alpha Spectropolarimeter (CLASP)
Auchère, F.; Giono, G.; Kubo, M. +25 more
High-cadence observations by the slit-jaw (SJ) optics system of the sounding rocket experiment known as the Chromospheric Lyman Alpha Spectropolarimeter (CLASP) reveal ubiquitous intensity disturbances that recurrently propagate in either the chromosphere or the transition region or both at a speed much higher than the speed of sound. The CLASP/SJ…