Filters

2021 - 20222

More filters

20232
Reset filters

Settings

Author: Seth, Anil ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Detection of a 100,000 M-circle dot black hole in M31's Most Massive Globular Cluster: A Tidally Stripped Nucleus
    (London : Institute of Physics Publ., 2022) Pechetti, Renuka; Seth, Anil; Kamann, Sebastian; Caldwell, Nelson; Strader, Jay; den Brok, Mark; Luetzgendorf, Nora; Neumayer, Nadine; Voggel, Karina
    We investigate the presence of a central black hole (BH) in B023-G078, M31's most massive globular cluster. We present high-resolution, adaptive-optics assisted, integral-field spectroscopic kinematics from Gemini/NIFS that show a strong rotation (∼20 km s-1) and a velocity dispersion rise toward the center (37 km s-1). We combine the kinematic data with a mass model based on a two-component fit to HST ACS/HRC data of the cluster to estimate the mass of a putative BH. Our dynamical modeling suggests a >3σ detection of a BH component of (1σ uncertainties). The inferred stellar mass of the cluster is , consistent with previous estimates, thus the BH makes up 1.5% of its mass. We examine whether the observed kinematics are caused by a collection of stellar mass BHs by modeling an extended dark mass as a Plummer profile. The upper limit on the size scale of the extended mass is 0.56 pc (95% confidence), which does not rule out an extended mass. There is compelling evidence that B023-G078 is the tidally stripped nucleus of a galaxy with a stellar mass >109 M o˙, including its high-mass, two-component luminosity profile, color, metallicity gradient, and spread in metallicity. Given the emerging evidence that the central BH occupation fraction of >109 M o˙ galaxies is high, the most plausible interpretation of the kinematic data is that B023-G078 hosts a central BH. This makes it the strongest BH detection in a lower-mass (<107 M o˙) stripped nucleus, and one of the few dynamically detected intermediate-mass BHs.
  • Thumbnail Image
    Item
    Erratum: "Resolved Nuclear Kinematics Link the Formation and Growth of Nuclear Star Clusters with the Evolution of Their Early and Late-type Hosts" (2021, ApJ, 921, 8)
    (London : Institute of Physics Publ., 2021) Pinna, Francesca; Neumayer, Nadine; Seth, Anil; Emsellem, Eric; Nguyen, Dieu D.; Böker, Torsten; Cappellari, Michele; McDermid, Richard M.; Voggel, Karina; Walcher, C. Jakob
    We have identified an error in Equations (D3) and (D4) in Appendix D of the published article. These equations result from the combination of Equations (16), (17), and (18) in Harborne et al. (2020). In the published article, the right-hand sides are swapped with each other. The corrected versions of the equations are (Formula Presented). All results shown and discussed in the published article were obtained using the correct version of the equations and do not need any modifications.