Search Publications
HD 219666 b: a hot-Neptune from TESS Sector 1
Alonso, R.; Bouchy, F.; Deeg, H. +73 more
We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M⋆ = 0.92 ± 0.03 M⊙, R⋆ = 1.03 ± 0.03 R⊙, τ⋆ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊕, a radius of Rb = 4.71 ± 0.17 R…
A Method to Search for Black Hole Candidates with Giant Companions by LAMOST
Liu, Jifeng; Bai, Yu; Gu, Wei-Min +10 more
We propose a method to search for stellar-mass black hole (BH) candidates with giant companions from spectroscopic observations. Based on the stellar spectra of Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) Data Release 6, we obtain a sample of seven giants in binaries with large radial velocity variation ΔV R >…
Black hole mass estimates in quasars. A comparative analysis of high- and low-ionization lines
Bon, E.; Marziani, P.; Bon, N. +7 more
Context. The inter-line comparison between high- and low-ionization emission lines has yielded a wealth of information on the structure and dynamics of the quasar broad line region (BLR), including perhaps the earliest unambiguous evidence in favor of a disk + wind structure in radio-quiet quasars.
Aims: We carried out an analysis of the C IV…
A recurrent nova super-remnant in the Andromeda galaxy
Ness, J. -U.; Henze, M.; Shafter, A. W. +15 more
The accretion of hydrogen onto a white dwarf star ignites a classical nova eruption1,2—a thermonuclear runaway in the accumulated envelope of gas, leading to luminosities up to a million times that of the Sun and a high-velocity mass ejection that produces a remnant shell (mainly consisting of insterstellar medium). Close to the upper m…
Expected intermediate-mass black holes in the Virgo cluster - II. Late-type galaxies
Soria, Roberto; Graham, Alister W.; Davis, Benjamin L.
The Chandra X-ray Observatory's Cycle 18 Large Program titled `Spiral galaxies of the Virgo Cluster' will image 52 galaxies with the ACIS-S detector. Combined with archival data for an additional 22 galaxies, this will represent the complete sample of 74 spiral galaxies in the Virgo cluster with star formation rates ≳0.3 M⊙ yr-1
Multi-wavelength de-blended Herschel view of the statistical properties of dusty star-forming galaxies across cosmic time
Béthermin, M.; Wang, L.; Michałowski, M. J. +5 more
Aims: We study the statistical properties of dusty star-forming galaxies across cosmic time, such as their number counts, luminosity functions (LF), and the dust-obscured star formation rate density (SFRD).
Methods: We used the most recent de-blended Herschel catalogue in the COSMOS field to measure the number counts and LFs at far-infra…
The AGN fuelling/feedback cycle in nearby radio galaxies - II. Kinematics of the molecular gas
Davis, Timothy A.; Bureau, Martin; Casasola, Viviana +7 more
This is the second paper of a series exploring the multicomponent (stars, warm and cold gas, and radio jets) properties of a sample of 11 nearby low-excitation radio galaxies, with the aim of better understanding the active galactic nuclei (AGN) fuelling/feedback cycle in these objects. Here, we present a study of the molecular gas kinematics of s…
HDO and SO2 thermal mapping on Venus. IV. Statistical analysis of the SO2 plumes
Encrenaz, T.; Atreya, S. K.; Bézard, B. +10 more
Since January 2012 we have been monitoring the behavior of sulfur dioxide and water on Venus, using the Texas Echelon Cross-Echelle Spectrograph (TEXES) imaging spectrometer at the NASA InfraRed Telescope Facility (IRTF, Mauna Kea Observatory). We present here the observations obtained between January 2016 and September 2018. As in the case of our…
CHANG-ES. XIII. Transport processes and the magnetic fields of NGC 4666: indication of a reversing disk magnetic field
Weżgowiec, M.; Soida, M.; Dettmar, R. -J. +10 more
Context. The observation of total and linearly polarized synchrotron radiation of spiral galaxies in the radio continuum reveals the distribution and structure of their magnetic fields. By observing these, information about the proposed dynamo processes that preserve the large-scale magnetic fields in spiral galaxies can be gained. Additionally, b…
Investigating the Transition Region Explosive Events and Their Relationship to Network Jets
Chen, Yajie; Tian, Hui; Peter, Hardi +2 more
Recent imaging observations with the Interface Region Imaging Spectrograph (IRIS) have revealed prevalent intermittent jets with apparent speeds of 80-250 km s-1 from the network lanes in the solar transition region (TR). Additionally, spectroscopic observations of the TR lines have revealed the frequent presence of highly non-Gaussian …