Search Publications
NICER X-Ray Observations of Seven Nearby Rotation-powered Millisecond Pulsars
Chakrabarty, Deepto; Bogdanov, Slavko; Deneva, Julia S. +18 more
The Neutron star Interior Composition Explorer observed several rotation-powered millisecond pulsars (MSPs) to search for or confirm the presence of X-ray pulsations. When broad and sine-like, these pulsations may indicate thermal emission from hot polar caps at the magnetic poles on the neutron star surface. We report confident detections (≥4.7σ …
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) - I. Search for exoplanets and variable stars in the field of 47 Tuc
Bedin, L. R.; Montalto, M.; Piotto, G. +9 more
The TESS mission will survey ∼85 per cent of the sky, giving us the opportunity of extracting high-precision light curves of millions of stars, including stellar cluster members. In this work, we present our project `A PSF-based Approach to TESS High quality data Of Stellar clusters' (PATHOS), aimed at searching and characterize candidate exoplane…
Chandra centres for COSMOS X-ray galaxy groups: differences in stellar properties between central dominant and offset brightest group galaxies
Daddi, Emanuele; Dolag, Klaus; Capak, Peter +24 more
We present the results of a search for galaxy clusters and groups in the ∼2 deg2 of the COSMOS field using all available X-ray observations from the XMM-Newton and Chandra observatories. We reach an X-ray flux limit of 3× 10^{-16} erg cm^{-2 s}^{-1} in the 0.5-2 keV range, and identify 247 X-ray groups with M_{ 200c}=8× 10^{12}-3× 10^{1…
Time-distance helioseismology of solar Rossby waves
Gizon, Laurent; Liang, Zhi-Chao; Birch, Aaron C. +1 more
Context. Solar Rossby waves (r modes) have recently been discovered in the near-surface horizontal flow field using the techniques of granulation-tracking and ring-diagram analysis applied to six years of SDO/HMI data.
Aims: Here we apply time-distance helioseismology to the combined SOHO/MDI and SDO/HMI data sets, which cover 21 years of obs…
Study of Lithium-rich giants with the GALAH spectroscopic survey
Deepak; Reddy, Bacham E.
In this article, we speculate on the possible mechanisms for Li enhancement origin in RGB stars based on a large data set of around 340 299 stars collected from the GALAH survey combined with the Gaia astrometry. Data has 51 982 low mass (M ≤ 2 M⊙) RGB stars with reliable atmospheric parameters. The data set shows a well-populated RGB w…
Charting nearby dust clouds using Gaia data only
Enßlin, T. A.; Leike, R. H.
Aims: Highly resolved maps of the local Galactic dust are an important ingredient for sky emission models. Over almost the whole electromagnetic spectrum one can see imprints of dust, many of which originate from dust clouds within 300 pc. Having a detailed 3D reconstruction of these local dust clouds enables detailed studies, helps to quanti…
Multi-wavelength Properties of Type 1 and Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey
Lusso, Elisabeta; Marchesi, Stefano; Onodera, Masato +6 more
We investigate the multi-wavelength properties of host galaxies of 3701 X-ray-selected active galactic nuclei (AGNs) out to z ∼ 5 in the Chandra-COSMOS Legacy Survey. Thanks to the extensive multi-wavelength photometry available in the COSMOS field, we derive AGN luminosities, host stellar masses, and star formation rates (SFRs) via a multi-compon…
Dissecting the AGN Disk-Jet System with Joint VLBI-Gaia Analysis
Kovalev, Y. Y.; Plavin, A. V.; Petrov, L. Y.
We analyze differences in positions of active galactic nuclei (AGNs) between Gaia data release 2 and very long baseline interferometry (VLBI) and compare the significant VLBI-to-Gaia offsets in more than 1000 objects with their jet directions. Remarkably at least three-fourths of the significant offsets are confirmed to occur downstream or upstrea…
Barium and related stars, and their white-dwarf companions. II. Main-sequence and subgiant starss
Jorissen, A.; Pourbaix, D.; Escorza, A. +12 more
Barium (Ba) dwarfs and CH subgiants are the less evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by their binary companions when the companion was on the asymptotic giant branch (AGB). This companion is now a white dwarf that in most cases cannot be directly detected. We present a large…
ALMA captures feeding and feedback from the active galactic nucleus in NGC 613
Krips, M.; van der Werf, P.; Combes, F. +11 more
We report ALMA observations of CO(3-2) emission in the Seyfert/nuclear starburst galaxy NGC 613, at a spatial resolution of 17 pc, as part of our NUclei of GAlaxies (NUGA) sample. Our aim is to investigate the morphology and dynamics of the gas inside the central kiloparsec, and to probe nuclear fueling and feedback phenomena. The morphology of CO…