CaltechAUTHORS
  A Caltech Library Service

Constraints on the Growth and Spin of the Supermassive Black Hole in M32 From High Cadence Visible Light Observations

Chary, R. and Hallinan, G. and Harding, L. K. and Saini, N. S. and Schlichting, H. E. (2017) Constraints on the Growth and Spin of the Supermassive Black Hole in M32 From High Cadence Visible Light Observations. . (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20190404-130025443

[img] PDF - Submitted Version
See Usage Policy.

1434Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20190404-130025443

Abstract

instrument at the Hale 200-inch telescope of the Palomar Observatory. Using field stars as a baseline for relative photometry, we are able to construct a light curve of the nucleus in the g-prime and r-prime band with 1σ=36 milli-mag photometric stability. We derive a temporal power spectrum for the nucleus and find no evidence for a time-variable signal above the noise as would be expected if the nuclear black hole were accreting gas. Thus, we are unable to constrain the spin of the black hole although future work will use this powerful instrument to target more actively accreting black holes. Given the black hole mass of (2.5±0.5)*10^6 M⊙ inferred from stellar kinematics, the absence of a contribution from a nuclear time-variable signal places an upper limit on the accretion rate which is 4.6x10^(-8) of the Eddington rate, a factor of two more stringent than past upper limits from HST. The low mass of the black hole despite the high stellar density suggests that the gas liberated by stellar interactions was primarily at early cosmic times when the low-mass black hole had a small Eddington luminosity. This is at least partly driven by a top-heavy stellar initial mass function at early cosmic times which is an efficient producer of stellar mass black holes. The implication is that supermassive black holes likely arise from seeds formed through the coalescence of 3-100 M_⊙ mass black holes that then accrete gas produced through stellar interaction processes.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1705.00724arXivDiscussion Paper
ORCID:
AuthorORCID
Chary, R.0000-0001-7583-0621
Hallinan, G.0000-0002-7083-4049
Group:Infrared Processing and Analysis Center (IPAC)
Record Number:CaltechAUTHORS:20190404-130025443
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190404-130025443
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94462
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Apr 2019 21:09
Last Modified:04 Apr 2019 21:09

Repository Staff Only: item control page