Search Publications
Most of the cool CGM of star-forming galaxies is not produced by supernova feedback
Afruni, Andrea; Fraternali, Filippo; Pezzulli, Gabriele
The characterization of the large amount of gas residing in the galaxy haloes, the so-called circumgalactic medium (CGM), is crucial to understand galaxy evolution across cosmic time. We focus here on the cool (T ~ 104 K) phase of this medium around star-forming galaxies in the local Universe, whose properties and dynamics are poorly un…
New open clusters found by manual mining of data based on Gaia DR2
Casado, Juan
The physical nature of a series of 20 new open clusters is confirmed employing existing data on putative star members, mainly from the second Gaia Data Release (DR2). The clusters were discovered as overdensities of stars by visual inspection of either photographic DSS plates or proper motion plots of random source fields. The reported objects are…
Caltech-NRAO Stripe 82 Survey (CNSS). V. AGNs That Transitioned to Radio-loud State
Gromadzki, Mariusz; Hallinan, Gregg; Ishwara-Chandra, C. H. +6 more
A recent multiyear Caltech-NRAO Stripe 82 Survey revealed a group of objects that appeared as new radio sources after >5-20 yr of absence. They are transient phenomena with respect to the Faint Images of the Radio Sky at Twenty Centimeters survey and constitute the first unbiased sample of renewed radio activity. Here we present a follow-up, ra…
Identifying Planetary Transit Candidates in TESS Full-frame Image Light Curves via Convolutional Neural Networks
Powell, Brian P.; Barclay, Thomas; Kruse, Ethan +8 more
The Transiting Exoplanet Survey Satellite (TESS) mission measured light from stars in ∼75% of the sky throughout its 2 yr primary mission, resulting in millions of TESS 30-minute-cadence light curves to analyze in the search for transiting exoplanets. To search this vast data trove for transit signals, we aim to provide an approach that both is co…
Flaring and Spot Activities on the Semi-detached Binary System KIC 06852488
Shi, Xiang-dong; Qian, Sheng-bang; Li, Lin-jia +1 more
The continuous and unbroken time-series photometry data of Kepler and the Transiting Exoplanet Survey Satellite (TESS) provide a good opportunity to study the continuous variations in the light curve of binary stars. This paper reports the discoveries of the correlation between the two maxima on the light curve of KIC 06852488 and the correlation …
Hybrid Comptonization and Electron-Positron Pair Production in the Black-hole X-Ray Binary MAXI J1820+070
Poutanen, Juri; Zdziarski, Andrzej A.; Szanecki, Michał +6 more
We study X-ray and soft gamma-ray spectra from the hard state of the accreting black-hole binary MAXI J1820+070. We perform an analysis of two joint spectra from NuSTAR and INTEGRAL, covering the range of 3-650 keV, and of an average joint spectrum over the rise of the hard state, covering the 3-2200 keV range. The spectra are well modeled by Comp…
The flaring X-ray corona in the quasar PDS 456
Porquet, D.; Reeves, J. N.; Braito, V. +3 more
New Swift monitoring observations of the variable, radio-quiet quasar, PDS 456, are presented. A bright X-ray flare was captured in 2018 September, the flux increasing by a factor of 4 and with a doubling time-scale of 2 d. From the light crossing argument, the coronal size is inferred to be ≲30 gravitational radii for a black hole mass of 10…
Jupiter's Temperate Belt/Zone Contrasts Revealed at Depth by Juno Microwave Observations
Bolton, S.; Fletcher, L. N.; Wong, M. H. +12 more
Juno microwave radiometer (MWR) observations of Jupiter's midlatitudes reveal a strong correlation between brightness temperature contrasts and zonal winds, confirming that the banded structure extends throughout the troposphere. However, the microwave brightness gradient is observed to change sign with depth: the belts are microwave-bright in the…
Dynamical Analysis of the Dark Matter and Central Black Hole Mass in the Dwarf Spheroidal Leo I
Gebhardt, Karl; Zeimann, Greg; Thomas, Jens +4 more
We measure the central kinematics for the dwarf spheroidal galaxy Leo I using integrated-light measurements and previously published data. We find a steady rise in the velocity dispersion from 300″ into the center. The integrated-light kinematics provide a velocity dispersion of 11.76 ± 0.66 km s-1 inside 75″. After applying appropriate…
Multi-thermal atmosphere of a mini-solar flare during magnetic reconnection observed with IRIS
Heinzel, Petr; Aulanier, Guillaume; Schmieder, Brigitte +4 more
Context. The Interface Region Imaging Spectrograph (IRIS) with its high spatial and temporal resolution facilitates exceptional plasma diagnostics of solar chromospheric and coronal activity during magnetic reconnection.
Aims: The aim of this work is to study the fine structure and dynamics of the plasma at a jet base forming a mini-flare bet…