Search Publications
Hot WHIM counterparts of FUV O VI absorbers: Evidence in the line-of-sight towards quasar 3C 273
Kaastra, Jelle; Finoguenov, Alexis; Schaye, Joop +7 more
Aims: We explore the high spectral resolution X-ray data towards the quasar 3C 273 to search for signals of hot (∼106-7 K) X-ray-absorbing gas co-located with two established intergalactic far-ultraviolet (FUV) O VI absorbers.
Methods: We analyze the soft X-ray band grating data of all XMM-Newton and Chandra instruments to sea…
Flare Energy Release at the Magnetic Field Polarity Inversion Line during the M1.2 Solar Flare of 2015 March 15. II. Investigation of Photospheric Electric Current and Magnetic Field Variations Using HMI 135 s Vector Magnetograms
Zimovets, I. V.; Sharykin, I. N.; Myshyakov, I. I.
This work is a continuation of Paper I and is devoted to the analysis of nonthermal electron dynamics and plasma heating in the confined M1.2 class solar flare SOL2015-03-15T22:43, revealing energy release in the highly sheared interacting magnetic loops in the low corona, above the polarity inversion line (PIL). The aim of the present work is to …
The nuclear architecture of NGC 4151: on the path toward a universal outflow mechanism in light of NGC 1068
Williams, D. R. A.; Steiner, J. E.; May, D. +2 more
We report near-infrared integral field spectroscopic observations of the active galactic nucleus NGC 4151 with archive data from the NIFS-Gemini North Telescope. We have selected best-seeing observations (≲0.3 arcsec) that, allied to our methodology of image processing techniques, show structures with spatial resolution comparable to those of the …
Characterization of the Particle-induced Background of XMM-Newton EPIC-pn: Short- and Long-term Variability
Miller, Eric D.; Kraft, Ralph; Gastaldello, Fabio +16 more
The particle-induced background of X-ray observatories is produced by galactic cosmic ray (GCR) primary protons, electrons, and He ions. Events due to direct interaction with the detector are usually removed by onboard processing. The interactions of these primary particles with the detector environment produce secondary particles that mimic X-ray…
The catalogue of cometary orbits and their dynamical evolution
Dybczyński, Piotr A.; Królikowska, Małgorzata
We present the CODE catalogue, the new cometary catalogue containing data for almost 300 long-period comets that were discovered before 2018. This is the first catalogue containing cometary orbits in the five stages of their dynamical evolution and covering three successive passages through the perihelion, with the exception of the hyperbolic come…
Bright Lyman-α emitters among Spitzer SMUVS galaxies in the MUSE/COSMOS field
Caminha, G. B.; Caputi, K. I.; Rosani, G. +1 more
We search for the presence of bright Lyα emitters among Spitzer SMUVS galaxies at z > 2.9 making use of homogeneous MUSE spectroscopic data. Although these data only cover a small region of COSMOS, MUSE has the unique advantage of providing spectral information over the entire field, without the need of target pre-selection. This results in an …
HST Survey of the Orion Nebula Cluster in the H2O 1.4 µm Absorption Band. II. The Substellar IMF Down to Planetary Masses
Gennaro, Mario; Robberto, Massimo
We utilize the ability of the Hubble Space Telescope to probe near-infrared water absorption present in the atmosphere of low-mass stars and brown-dwarf and planetary-mass objects to create a pure sample of Orion Nebula Cluster (ONC) members, not affected by contamination from background stars and galaxies that lack water absorption. Thanks to the…
NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?
Harrison, F. A.; Stern, D.; Alexander, D. M. +20 more
We present NuSTAR (Nuclear Spectroscopic Telescope Array) observations of four active galactic nuclei (AGNs) located within 15 Mpc. These AGNs, namely ESO 121-G6, NGC 660, NGC 3486, and NGC 5195, have observed X-ray luminosities of L2-10 keV,obs ≲ 1039 erg s-1, classifying them as low-luminosity AGN (LLAGN). We per…
Cosmology with quasars: predictions for eROSITA from a quasar Hubble diagram
Lusso, Elisabeta
The effort for understanding the matter and energy content of the Universe and its evolution relies on different probes, such as cosmic background radiation, cluster lensing, supernovae. Yet, we are still far from grasping what dark matter is made of, and what the physical origin of dark energy is. Our group has developed a technique that makes us…
Joining Bits and Pieces of Reionization History
Finelli, Fabio; Paoletti, Daniela; Hazra, Dhiraj Kumar +1 more
Cosmic microwave background (CMB) temperature and polarization anisotropies from Planck have estimated a lower value of the optical depth to reionization (τ ) compared to WMAP. A significant period in the reionization history would then fall within 6 <redshift(z )<10 , where detection of galaxies with Hubble frontier fields program and indep…