Search Publications
Suppressed cooling and turbulent heating in the core of X-ray luminous clusters RXCJ1504.1-0248 and Abell 1664
McNamara, Brian R.; Fabian, Andrew C.; Sanders, Jeremy S. +3 more
We present the analysis of XMM-Newton observations of two X-ray luminous cool core clusters, RXCJ1504.1-0248 and Abell 1664. The Reflection Grating Spectrometer reveals a radiative cooling rate of $180\pm 40\, \rm M_{\odot }\rm \, yr^{-1}$ and $34\pm 6\, \rm M_{\odot }\rm \, yr^{-1}$ in RXCJ1504.1-0248 and Abell 1664 for gas above 0.7 keV, respect…
Cosmic-ray flux predictions and observations for and with Metis on board Solar Orbiter
Heinzel, P.; Gissot, S.; Sasso, C. +41 more
Context. The Metis coronagraph is one of the remote sensing instruments hosted on board the ESA/NASA Solar Orbiter mission. Metis is devoted to carry out the first simultaneous imaging of the solar corona in both visible light (VL) and ultraviolet (UV). High-energy particles can penetrate spacecraft materials and may limit the performance of the o…
KiDS+VIKING-450: An internal-consistency test for cosmic shear tomography with a colour-based split of source galaxies
Hoekstra, Henk; Kuijken, Konrad; Hildebrandt, Hendrik +3 more
We performed an internal-consistency test of the KiDS+VIKING-450 (KV450) cosmic shear analysis with a colour-based split of source galaxies. Utilising the same measurements and calibrations for both sub-samples, we inspected the characteristics of the shear measurements and the performance of the calibration pipelines. On the modelling side, we ex…
Monitoring the negative polarization in Comet 29P/Schwassmann-Wachmann during quiescence
Kim, Sungsoo S.; Videen, Gorden; Zubko, Evgenij +4 more
During five nights between February 3 and 10, 2021, we monitored the degree of linear polarization in Comet 29P/Schwassmann-Wachmann with the broadband R filter. It is the first polarimetric investigation of this comet measured during a period of quiescent activity. We found a nearly constant negative polarization PQ ≈ -2.1% at α ≈ 9.5°…
AstroSat Study of the Globular Cluster NGC 2298: Probable Evolutionary Scenarios of Hot Horizontal Branch Stars
Sahu, Snehalata; Chung, Chul; Subramaniam, Annapurni +3 more
We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical color-magnitude diagrams (CMDs) are constructed for member stars in combination with Hubble Space Telescope UV Globular Cluster Survey data for the central region and G…
Testing the tidal stripping scenario of ultracompact dwarf galaxy formation by using internal properties
Drinkwater, Michael J.; Liu, Chengze; Côté, Patrick +5 more
We use the hydrodynamical EAGLE simulation to test if ultracompact dwarf galaxies (UCDs) can form by tidal stripping by predicting the ages and metallicities of tidally stripped galaxy nuclei in massive galaxy clusters, and compare these results to compiled observations of age and metallicities of observed UCDs. We further calculate the colours of…
Mid-IR cosmological spectrophotometric surveys from space: Measuring AGN and star formation at the cosmic noon with a SPICA-like mission
Bisigello, Laura; Kohno, Kotaro; Alonso-Herrero, Almudena +31 more
We use the SPace Infrared telescope for Cosmology and Astrophysics (SPICA) project as a template to demonstrate how deep spectrophotometric surveys covering large cosmological volumes over extended fields (1–$15\, \rm{deg^2}$) with a mid-IR imaging spectrometer (17–$36\, \rm{\rm{\upmu m}}$) in conjunction with deep$70\, \rm{\rm{\upmu m}}$photometr…
Nucleosynthesis constraints through γ-ray line measurements from classical novae. Hierarchical model for the ejecta of 22Na and 7Be
Siegert, Thomas; Ghosh, Sohan; Mathur, Kalp +2 more
Context. Classical novae belong to the most frequent transient events in the Milky Way and are key agents of ongoing nucleosynthesis. Despite their large numbers, they have never been observed in soft γ-ray emission. Measurements of their γ-ray signatures would provide insights into explosion mechanism and nucleosynthesis products.
Aims: Our …
Accretion and outflow activity in proto-brown dwarfs
Riaz, B.; Bally, J.
We present a near-infrared study of accretion and outflow activity in six Class 0/I proto-brown dwarfs (proto-BDs) using VLT/SINFONI spectroscopy and spectroimaging observations. The spectra show emission in several [Fe II] and H2 lines associated with jet/outflow activity, and in the accretion diagnostics of Pa β and Br γ lines. The pe…
Exploring New Redshift Indicators for Radio-Powerful AGN
Carvajal, Rodrigo; Matute, Israel; Afonso, José +4 more
Active Galactic Nuclei (AGN) are relevant sources of radiation that might have helped reionising the Universe during its early epochs. The super-massive black holes (SMBHs) they host helped accreting material and emitting large amounts of energy into the medium. Recent studies have shown that, for epochs earlier than z∼5, the number density of SMB…