An ALMA Gas-dynamical Mass Measurement of the Supermassive Black Hole in the Local Compact Galaxy UGC 2698

Abstract

We present 0\farcs{14}-resolution Atacama Large Millimeter/submillimeter Array (ALMA) CO(2$-$1) observations of the circumnuclear gas disk in UGC 2698, a local compact galaxy. The disk exhibits regular rotation with projected velocities rising to 450 km s${}^{-1}$ near the galaxy center. We fit gas-dynamical models to the ALMA data cube, assuming the CO emission originates from a dynamically cold, thin disk, and measured the mass of the supermassive black hole (BH) in UGC 2698 to be $M_{\mathrm{BH}}=(2.46\pm 0.07$ [$1\sigma$ stat] ${}_{-0.78}^{+0.70}$ [sys])$\times 10^9$ $M_{\odot }$. UGC 2698 is part of a sample of nearby early-type galaxies that are plausible $z\sim 2$ red nugget relics. Previous stellar-dynamical modeling for three galaxies in the sample found BH masses consistent with the BH mass$-$stellar velocity dispersion ($M_{\mathrm{BH}}-{\sigma }_{\star }$) relation but over-massive relative to the BH mass$-$bulge luminosity ($M_{\mathrm{BH}}-L_{\mathrm{bul}}$) correlation, suggesting that BHs may gain the majority of their mass before their host galaxies. However, UGC 2698 is consistent with both $M_{\mathrm{BH}}-{\sigma }_{\star }$ and $M_{\mathrm{BH}}-L_{\mathrm{bul}}$. As UGC 2698 has the largest stellar mass and effective radius in the local compact galaxy sample, it may have undergone more recent mergers that brought it in line with the BH scaling relations. Alternatively, given that the three previously-measured compact galaxies are outliers from $M_{\mathrm{BH}}-L_{\mathrm{bul}}$, while UGC 2698 is not, there may be significant scatter at the poorly sampled high-mass end of the relation. Additional gas-dynamical $M_{\mathrm{BH}}$ measurements for the compact galaxy sample will improve our understanding of BH$-$galaxy co-evolution.

18 pages, 7 figures. Submitted

References in corpus (27)

• Array Programming with NumPy
• The NumPy array: a structure for efficient numerical computation
• scikit-image: Image processing in Python
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• Unification of the Fundamental Plane and Super-Massive Black Holes Masses
• The Majority of Compact Massive Galaxies at z~2 are Disk Dominated
• An Over-Massive Black Hole in the Compact Lenticular Galaxy NGC1277
• The central parsecs of Centaurus A: High Excitation Gas, a Molecular Disk, and the Mass of the Black Hole
• A black-hole mass measurement from molecular gas kinematics in NGC4526
• Hunting for Supermassive Black Holes in Nearby Galaxies with the Hobby-Eberly Telescope
• Two new confirmed massive relic galaxies: red nuggets in the present-day Universe
• The initial mass function of a massive relic galaxy
• WISDOM Project - II: Molecular gas measurement of the supermassive black hole mass in NGC4697
• Revealing the intermediate-mass black hole at the heart of the dwarf galaxy NGC 404 with sub-parsec resolution ALMA observations
• The High-Mass End of the Black Hole Mass Function: Mass Estimates in Brightest Cluster Galaxies
• The AGN fuelling/feedback cycle in nearby radio galaxies - I. ALMA observations and early results
• WISDOM Project - I: Black Hole Mass Measurement Using Molecular Gas Kinematics in NGC 3665
• Black Hole Mass Measurements of Radio Galaxies NGC 315 and NGC 4261 Using ALMA CO Observations
• WISDOM Project - III: Molecular gas measurement of the supermassive black hole mass in the barred lenticular galaxy NGC4429
• A figure of merit for black hole mass measurements with molecular gas
• The Extremely High Dark Matter Halo Concentration of the Relic Compact Elliptical Galaxy Mrk 1216
• ALMA Observations of Circumnuclear Disks in Early Type Galaxies: 12CO(2-1) and Continuum Properties
• A Black Hole Mass Determination for the Compact Galaxy Mrk 1216
• Disky elliptical galaxies and the allegedly over-massive black hole in the compact massive `ES' galaxy NGC 1271
• The Correlation between Black Hole Mass and Stellar Mass for Classical Bulges and the Cores of Ellipticals
• MUSE stares into the shadows: the high-resolution dust attenuation curve of NGC 5626

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