We present a systematic interferometric search for close supermassive black hole (SMBH) binaries in 20 nearby type 1 active galactic nuclei (AGN) observed with VLTI/\grav. We investigate parsec-scale asymmetric emission by modeling the squared visibilities and closure phases with a single circular Gaussian component pl...
Gravity Collaboration K. Abd El Dayem, N. Aimar, A. Berdeu et al.· 0 citations
Over the past six years, the VLTI has undergone major upgrades, significantly improving its stability, sensitivity, and operational reliability. This has enabled the highest-angular-resolution images of stars orbiting our Galactic Center, high-precision interferometric astrometric measurements of exoplanet systems, and...
Luis Esteras Otal, J. Abad, R. Abuter et al.· Astronomical Telescopes + In...· 3 citations
Residing in the centre of the Milky Way, Sagittarius A* (Sgr A*) is the closest massive black hole1 (MBH). Its vicinity has allowed measuring individual stellar orbits around it2, 3–4. The stars act as test particles and probe the gravitational potential around the 4.3 × 106M⊙ MBH. These observations have determined th...
K. A. El Dayem, R. Abuter, N. Aimar et al.· Nature· 1 citation
GRAVITY+ is an upgrade of the VLTI infrastructure, providing unprecedented spatial resolution and sensitivity. One of the project's objectives was to replace the low-order NGS SCAO systems with four high-order AO modules incorporated in the Coudé train of each VLT UT: GRAVITY+ Adaptive Optics (GPAO). This paper present...
S. Oberti, J. Kolb, A. Berdeu et al.· Astronomical Telescopes + In...· 1 citation
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