120529082
Magnetic Circular Polarization of F-Center Emission
7861144
Are the black hole masses in narrow‐line Seyfert 1 galaxies actually small?
Narrow Line Seyfert 1 galaxies (NLS1s) are generally considered peculiar objects among the broad class of Type 1 active galactic nuclei, due to the relatively small width of the broad lines, strong X–ray variability, soft X–ray continua, weak [O iii], and strong Fe ii line intensities. The mass MBH of the central massive black hole (MBH) is claimed to be lighter than expected from known MBH–host galaxy scaling relations, while the accretion rate onto the MBH larger than the average value appropriate to Seyfert 1 galaxies. In this Letter, we show that NLS1 peculiar MBH and L/LEdd turn out to be fairly standard, provided that the broad line region is allowed to have a disc–like, rather than isotropic, geometry. Assuming that NLS1s are rather “normal” Seyfert 1 objects seen along the disc axis, we could estimate the typical inclination angles from the fraction of Seyfert 1 classified as NLS1s, and compute the geometrical factor relating the observed FWHM of broad lines to the virial mass of the MBH. We show that the geometrical factor can fully account for the “black hole mass deficit” observed in NLS1s, and that L/LEdd is (on average) comparable to the value of the more common broad line Seyfert 1 galaxies.
125510303
B meson decays into neutral kaons in the LHCb experiment
208867893
Performance of the ALICE muon trigger RPCs during LHC Run I
ALICE (A Large Ion Collider Experiment) studies the transition of nuclear matter to a deconfined phase known as Quark Gluon Plasma, in ultra-relativistic heavy-ion collisions at the LHC. ALICE is equipped with a muon spectrometer for the detection of quarkonia and heavy flavour particles. The trigger system of the spectrometer consists of 72 RPCs arranged in four detection planes, with a total area of 140 m2. In the first three years of LHC operation, the muon trigger system was fully operational in data-taking in pp, Pb-Pb and p-Pb collisions. The RPC performance and stability throughout the whole data-taking period is presented and discussed, for the parameters such as the efficiency, the dark counting rate, the dark current and the cluster size.