Pulsars, transients and relativistic astrophysics

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Upper Limits on the Rapid Cooling of the Central Compact Object in Cas A

The Astrophysical Journal American Astronomical Society 864:2 (2018) 135

Authors:

B Posselt, GG Pavlov

The first tidal disruption flare in ZTF: from photometric selection to multi-wavelength characterization

(2018)

Authors:

Sjoert van Velzen, Suvi Gezari, S Bradley Cenko, Erin Kara, James C Miller-Jones, Tiara Hung, Joe Bright, Nathaniel Roth, Nadejda Blagorodnova, Daniela Huppenkothen, Lin Yan, Eran Ofek, Jesper Sollerman, Sara Frederick, Charlotte Ward, Matthew J Graham, Rob Fender, Mansi M Kasliwal, Chris Canella, Robert Stein, Matteo Giomi, Valery Brinnel, Jakob Santen, Jakob Nordin, Eric C Bellm, Richard Dekany, Christoffer Fremling, V Zach Golkhou, Thomas Kupfer, Shrinivas R Kulkarni, Russ R Laher, Ashish Mahabal, Frank J Masci, Adam A Miller, James D Neill, Reed Riddle, Mickael Rigault, Ben Rusholme, Maayane T Soumagnac, Yutaro Tachibana

Architecture of the SOXS instrument control software

(2018)

Authors:

Davide Ricci, Andrea Baruffolo, Bernardo Salasnich, Daniela Fantinel, Josefina Urrutia, Sergio Campana, Riccardo Claudi, Pietro Schipani, Matteo Aliverti, Sagi Ben-Ami, Federico Biondi, Anna Brucalassi, Giulio Capasso, Rosario Cosentino, Francesco D'Alessio, Paolo D'Avanzo, Oz Diner, Hanindyo Kuncarayakti, Matteo Munari, Adam Rubin, Salvatore Scuderi, Fabrizio Vitali, Jani Achr茅n, Jos茅 Antonio Araiza-Duran, Iair Arcavi, Andrea Bianco, Enrico Cappellaro, Mirko Colapietro, Massimo Della Valle, Sergio D'Orsi, Johan Fynbo, Avishay Gal-Yam, Matteo Genoni, Mika Hirvonen, Jari Kotilainen, Tarun Kumar, Marco Landoni, Jussi Lehti, Gianluca Li Causi, Luca Marafatto, Seppo Mattila, Giorgio Pariani, Giuliano Pignata, Michael Rappaport, Marco Riva, Stephen Smartt, Massimo Turatto, Ricardo Sanchez

Optical design of the SOXS spectrograph for ESO NTT

(2018)

Authors:

Ricardo Zanmar Sanchez, Matteo Munari, Adam Rubin, Sagi Ben-Ami, Anna Brucalassi, Hanindyo Kuncarayakti, Jani Achr茅n, Sergio Campana, Riccardo Claudi, Pietro Schipani, Matteo Aliverti, Andrea Baruffolo, Federico Biondi, Giulio Capasso, Rosario Cosentino, Francesco D'Alessio, Paolo D'Avanzo, Salvatore Scuderi, Fabrizio Vitali, Jos茅 Antonio Araiza-Duran, Iair Arcavi, Andrea Bianco, Enrico Cappellaro, Mirko Colapietro, Massimo Della Valle, Oz Diner, Sergio D'Orsi, Daniela Fantinel, Johan Fynbo, Avishay Gal-Yam, Matteo Genoni, Ofir Hershko, Mika Hirvonen, Jari Kotilainen, Tarun Kumar, Marco Landoni, Jussi Lehti, Gianluca Li Causi, Luca Marafatto, Seppo Mattila, Giorgio Pariani, Giuliano Pignata, Michael Rappaport, Davide Ricci, Marco Riva, Bernardo Salasnich, Stephen Smartt, Massimo Turatto

Black Hole Disks in Galactic Nuclei

Phys. Rev. Lett. 121 (2018) 101101-101101

Authors:

脕kos Sz枚lgy茅n, Bence Kocsis

Abstract:

Gravitational torques among objects orbiting a supermassive black hole drive the rapid reorientation of orbital planes in nuclear star clusters (NSCs), a process known as vector resonant relaxation. In this Letter, we determine the statistical equilibrium of systems with a distribution of masses, semimajor axes, and eccentricities. We average the interaction over the apsidal precession time and construct a Monte Carlo Markov chain method to sample the microcanonical ensemble of the NSC. We examine the case of NSCs formed by 16 episodes of star formation or globular cluster infall. We find that the massive stars and stellar mass black holes form a warped disk, while low mass stars resemble a spherical distribution with a possible net rotation. This explains the origin of the clockwise disk in the Galactic center and predicts a population of black holes (BHs) embedded within this structure. The rate of mergers among massive stars, tidal disruption events of massive stars by BHs, and BH-BH mergers are highly increased in such disks. The first two may explain the origin of the observed G1 and G2 clouds, the latter may be important for gravitational wave detections with LIGO and VIRGO. More generally, black holes are expected to settle in disks in all dense spherical stellar systems assembled by mergers of smaller systems including globular clusters.