scholarly journals Black hole mass measurements using ionized gas discs: systematic dust effects

2008 ◽  
Author(s):  
Maarten Baes ◽  
Sandip K. Chakrabarti ◽  
Archan S. Majumdar
Keyword(s):  
Black Hole ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Ionized Gas ◽  
Dust Effects

scholarly journals Fuzzy dark matter soliton cores around supermassive black holes

2020 ◽  
Vol 492 (4) ◽  
pp. 5721-5729 ◽  
Author(s):  
Elliot Y Davies ◽  
Philip Mocz
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Density Profile ◽  
Mass Region ◽  
Theoretical Modelling ◽  
Black Hole Mass ◽  
Squeezing Effect ◽  
Mass Measurements ◽  
Poisson Equations ◽  
Large Black Hole

ABSTRACT We explore the effect of a supermassive black hole (SMBH) on the density profile of a fuzzy dark matter (FDM) soliton core at the centre of a dark matter (DM) halo. We numerically solve the Schrödinger–Poisson equations, treating the black hole as a gravitational point mass, and demonstrate that this additional perturbing term has a ‘squeezing’ effect on the soliton density profile, decreasing the core radius, and increasing the central density. In the limit of large black hole mass, the solution approaches one akin to the hydrogen atom, with radius inversely proportional to the black hole mass. By applying our analysis to two specific galaxies (M87 and the Milky Way) and pairing it with known observational limits on the amount of centrally concentrated DM, we obtain a constraint on the FDM particle mass, finding that the range 10−22.12 eV ≲ m ≲ 10−22.06 eV should be forbidden (taking into account additional factors concerning the lifetime of the soliton in the vicinity of a black hole). Improved observational mass measurements of the black hole and total enclosed masses will significantly extend the lower bound on the excluded FDM mass region, while self-consistent theoretical modelling of the soliton–black hole system can extend the upper bound.

scholarly journals C iv black hole mass measurements with the Australian Dark Energy Survey (OzDES)

2019 ◽  
Vol 487 (3) ◽  
pp. 3650-3663 ◽  
Author(s):  
J K Hoormann ◽  
P Martini ◽  
T M Davis ◽  
A King ◽  
C Lidman ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Energy ◽  
Emission Line ◽  
Galaxy Evolution ◽  
Supermassive Black Holes ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Dark Energy Survey ◽  
Energy Survey

ABSTRACT Black hole mass measurements outside the local Universe are critically important to derive the growth of supermassive black holes over cosmic time, and to study the interplay between black hole growth and galaxy evolution. In this paper, we present two measurements of supermassive black hole masses from reverberation mapping (RM) of the broad C iv emission line. These measurements are based on multiyear photometry and spectroscopy from the Dark Energy Survey Supernova Program (DES-SN) and the Australian Dark Energy Survey (OzDES), which together constitute the OzDES RM Program. The observed reverberation lag between the DES continuum photometry and the OzDES emission line fluxes is measured to be $358^{+126}_{-123}$ and $343^{+58}_{-84}$ d for two quasars at redshifts of 1.905 and 2.593, respectively. The corresponding masses of the two supermassive black holes are 4.4 × 109 and 3.3 × 109 M⊙, which are among the highest redshift and highest mass black holes measured to date with RM studies. We use these new measurements to better determine the C iv radius−luminosity relationship for high-luminosity quasars, which is fundamental to many quasar black hole mass estimates and demographic studies.

scholarly journals Testing the robustness of black hole mass measurements with ALMA and MUSE

2019 ◽  
Vol 14 (S353) ◽  
pp. 199-202
Author(s):  
Sabine Thater ◽  
Davor Krajnović ◽  
Dieu D. Nguyen ◽  
Satoru Iguchi ◽  
Peter M. Weilbacher
Keyword(s):  
Black Hole ◽  
Adaptive Optics ◽  
Molecular Gas ◽  
Black Hole Mass ◽  
Stellar Kinematics ◽  
Mass Measurements ◽  
Massive Black Hole ◽  
Gas Kinematics ◽  
Ongoing Work ◽  
Black Hole Masses

AbstractWe present our ongoing work of using two independent tracers to estimate the supermassive black hole mass in the nearby early-type galaxy NGC 6958; namely integrated stellar and molecular gas kinematics. We used data from the Atacama Large Millimeter/submillimeter Array (ALMA), and the adaptive-optics assisted Multi-Unit Spectroscopic Explorer (MUSE) and constructed state-of-the-art dynamical models. The different methods provide black hole masses of (2.89±2.05)×108M⊙ from stellar kinematics and (1.35±0.09)×108M⊙ from molecular gas kinematics which are consistent within their 3σ uncertainties. Compared to recent MBH - σe scaling relations, we derive a slightly over-massive black hole. Our results also confirm previous findings that gas-based methods tend to provide lower black hole masses than stellar-based methods. More black hole mass measurements and an extensive analysis of the method-dependent systematics are needed in the future to understand this noticeable discrepancy.

scholarly journals Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). VI. Black Hole Mass Measurements of Six Quasars at 6.1 ≤ z ≤ 6.7

2019 ◽  
Vol 880 (2) ◽  
pp. 77 ◽  
Author(s):  
Masafusa Onoue ◽  
Nobunari Kashikawa ◽  
Yoshiki Matsuoka ◽  
Nanako Kato ◽  
Takuma Izumi ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Mass ◽  
Mass Measurements

scholarly journals BLACK HOLE MASS MEASUREMENTS WITH REST-FRAME OPTICAL QUASAR SPECTRA AT 3

2012 ◽  
Vol 27 (4) ◽  
pp. 361-362
Author(s):  
Hyunsung David Jun ◽  
Myungshin Im ◽  
Hyung Mok Lee ◽  
AKARI QSONG team AKARI QSONG team
Keyword(s):  
Black Hole ◽  
Rest Frame ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Quasar Spectra

scholarly journals Addressing systematic uncertainties in black hole mass measurements

2011 ◽  
Author(s):  
Kelly Denney ◽  
Roberto J. Assef ◽  
Misty Bentz ◽  
Matthias Dietrich ◽  
Keith Horne ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Systematic Uncertainties

scholarly journals THE EFFECT OF SPATIAL GRADIENTS IN STELLAR MASS-TO-LIGHT RATIO ON BLACK HOLE MASS MEASUREMENTS

2013 ◽  
Vol 768 (1) ◽  
pp. L21 ◽  
Author(s):  
Nicholas J. McConnell ◽  
Shi-Fan Stephen Chen ◽  
Chung-Pei Ma ◽  
Jenny E. Greene ◽  
Tod R. Lauer ◽  
...  
Keyword(s):  
Black Hole ◽  
Stellar Mass ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Spatial Gradients

scholarly journals Black hole mass measurements in AGN: Polarization in broad emission lines

2018 ◽  
Vol 14 (S342) ◽  
pp. 1-4
Author(s):  
Luka Č. Popović ◽  
Victor L. Afanasiev ◽  
Djordje Savić
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Polarization Angle ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
Mass Estimation ◽  
Line Region ◽  
Good Agreement

AbstractWe present a new method for supermassive black hole (SMBH) mass measurements in Type 1 active galactic nuclei (AGN) using polarization angle across broad lines. This method gives measured masses which are in a good agreement with reverberation estimates. Additionally, we explore the possibilities and limits of this method using the STOKES radiative transfer code taking a dominant Keplerian motion in the broad line region (BLR). We found that this method can be used for the direct SMBH mass estimation in the cases when in addition to the Kepler motion, radial inflows or vertical outflows are present in the BLR. Some advantages of the method are discussed.

scholarly journals The Megamaser Cosmology Project: precise black hole mass measurement and the implication for the MBH–σ∗ relation

2014 ◽  
Vol 10 (S312) ◽  
pp. 56-60
Author(s):  
Cheng-Yu Kuo ◽  
James A. Braatz ◽  
James J. Condon ◽  
Caterina M. V. Impellizzeri ◽  
Kwok-Yung Lo ◽  
...  
Keyword(s):  
Black Hole ◽  
Velocity Dispersion ◽  
Mass Measurement ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
The North ◽  
Accuracy And Precision ◽  
The Galaxy ◽  
Stellar Velocity ◽  
Tight Correlation

AbstractWe made dynamical black hole mass measurements from nineteen Seyfert 2 galaxies which host sub-parsec H2O maser disks using the H2O megamaser technique. The nearly perfect Keplerian rotation curves in many of these maser systems guarantee the high accuracy and precision of the black hole mass measurements. With the stellar velocity dispersion (σ∗) of the galaxy bulges measured with the Dupont 2.5 m telescope at Las Campanas Observatory in the South and the Apache Point Observatory (APO) 3.5m telescope in the North, we found that H2O maser galaxies, most of which host pseudo bulges rather than classical bulges, do not all follow the MBH–σ∗ relation shown in the literature. This result is well consistent with the latest findings by Kormendy & Ho (2013) that only early type galaxies and galaxies with classical bulges follow a tight MBH–σ∗ relation. Such a tight correlation may not exist in pseudo bulge galaxies.

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