Search Publications
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…
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…
Four GRB supernovae at redshifts between 0.4 and 0.8. The bursts GRB 071112C, 111228A, 120714B, and 130831A
Greiner, J.; Klose, S.; Schady, P. +15 more
Twenty years ago, GRB 980425/SN 1998bw revealed that long gamma-ray bursts (GRBs) are physically associated with broad-lined type-Ic supernovae (SNe). Since then more than 1000 long GRBs have been localized to high angular precision, but only in ∼50 cases has the underlying SN component been identified. Using the Gamma-Ray Burst Optical Near-Infra…
Gaia DR2 distances to Collinder 419 and NGC 2264 and new astrometric orbits for HD 193 322 Aa,Ab and 15 Mon Aa,Ab
Maíz Apellániz, J.
Context. On the one hand, the second data release of the Gaia mission (Gaia DR2) has opened a trove of astrometric and photometric data for Galactic clusters within a few kiloparsecs of the Sun. On the other hand, lucky imaging has been an operational technique to measure the relative positions of visual binary systems for a decade and a half. Thi…
CO observations of major merger pairs at z = 0: molecular gas mass and star formation
Yun, Min S.; Gao, Yu; Domingue, Donovan L. +4 more
We present CO observations of 78 spiral galaxies in local merger pairs. These galaxies represent a subsample of a Ks-band-selected sample consisting of 88 close major-merger pairs (HKPAIRs), 44 spiral-spiral (S+S) pairs, and 44 spiral-elliptical (S+E) pairs, with separation <20 h-1 kpc and mass ratio <2.5. For all objec…
Constraining the properties of HD 206893 B. A combination of radial velocity, direct imaging, and astrometry data
Aigrain, S.; Rouan, D.; Meunier, N. +25 more
Context. High contrast imaging enables the determination of orbital parameters for substellar companions (planets, brown dwarfs) from the observed relative astrometry and the estimation of model and age-dependent masses from their observed magnitudes or spectra. Combining astrometric positions with radial velocity gives direct constraints on the o…
Investigating ULX accretion flows and cyclotron resonance in NGC 300 ULX1
Haberl, F.; Buchner, J.; Vasilopoulos, G. +2 more
Aims: We investigate accretion models for the newly discovered pulsating ultraluminous X-ray source (ULX) NGC 300 ULX1.
Methods: We analyzed broadband XMM-Newton and NuSTAR observations of NGC 300 ULX1, performing phase-averaged and phase-resolved spectroscopy. Using the Bayesian framework, we compared two physically motivated models for…
Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4‑650224
Rea, Nanda; Coti Zelati, Francesco; Torres, Diego F. +12 more
We report on a multi-wavelength study of the unclassified X-ray source CXOU J110926.4‑650224 (J1109). We identified the optical counterpart as a blue star with a magnitude of ∼20.1 (3300–10500 Å). The optical emission was variable on timescales from hundreds to thousands of seconds. The spectrum showed prominent emission lines with variable profil…
Measuring the local matter density using Gaia DR2
Widmark, A.
Aims: We determine the total dynamical matter density in the solar neighbourhood using the second Gaia data release (DR2).
Methods: The dynamical matter density distribution is inferred in a framework of a Bayesian hierarchical model, which accounts for position and velocity of all individual stars, as well as the full error covariance m…