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
High-signal-to-noise-ratio differential interferometric observations of active galactic nucleus broadline regions (AGN BLRs), combined with reverberation mapping, can provide direct angular-diameter distances through BLR parallax. Such measurements would complement standard candles and standard rulers, with application...
R. Petrov, Farin Drewes, J. Leftley et al.· Astronomical Telescopes + In...· 0 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
Obtaining accurate fluxes of faint sources from the ground in near- and mid-infrared wavelengths is challenging because of the rapidly changing atmospheric absorption. A common limitation is the lack of a nearby spectro-photometric calibrator. We present the STellar Absolute Reference Spectroscopic Flux Library (star...
V. G. Rosas, M. Hogerheijde, R. van Boekel et al.· Monthly notices of the Royal...· 0 citations
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