Host Galaxy Properties and Black Hole Mass of Swift J164449.3+573451 from Multi-Wavelength Long-Term Monitoring and HST Data

Abstract

We study the host galaxy properties of the tidal disruption object, Swift J164449.3+573451 using long-term optical to near-infrared (NIR) data. First, we decompose the galaxy surface brightness distribution and analyze the morphology of the host galaxy using high resolution \emph{HST} WFC3 images. We conclude that the host galaxy is a bulge-dominant galaxy that is well described by a single Sérsic model with Sérsic index $n=3.43\pm 0.05$. Adding a disk component, the bulge to total host galaxy flux ratio (B/T) is $0.83\pm 0.03$, which still indicates a bulge-dominant galaxy. Second, we estimate multi-band fluxes of the host galaxy through long-term light curves. Our long-term NIR light curves reveal the pure host galaxy fluxes $\sim 500$ days after the burst. We fit spectral energy distribution (SED) models to the multi-band fluxes from the optical to NIR of the host galaxy and determine its properties. The stellar mass, the star formation rate, and the age of stellar population are $\log (M_{\star }/M_{\odot })=9.14_{-0.10}^{+0.13}$, $0.03_{-0.03}^{+0.28}{M}_{\odot }$/yr, and $0.63_{-0.43}^{+0.95}$ Gyr. Finally, we estimate the mass of the central super massive black hole which is responsible for the tidal disruption event. The black hole mass is estimated to be $10^{6.7\pm 0.4}{M}_{\odot }$ from $M_{\mathrm{BH}}$ - $M_{\star ,\mathrm{bul}}$ and $M_{\mathrm{BH}}$ - $L_{\mathrm{bul}}$ relations for the $K$ band, although a smaller value of $\sim 10^5{M}_{\odot }$ cannot be excluded convincingly if the host galaxy harbors a pseudobulge.

12 pages, 10 figures, published in APJ

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• Infrared emission from tidal disruption events --- probing the pc-scale dust content around galactic nuclei
• Late time multi wavelength observations of Swift J1644+5734: A luminous optical/IR bump and quiescent X-ray emission
• Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2-8238
• Swift J1644+57: an Ideal Test Bed of Radiation Mechanisms in a Relativistic Super-Eddington Jet
• X-Ray afterglow of SWIFT J1644+57: a Compton echo?
• Velocity offset between emission and absorption lines might be an effective indicator of dual core system
• Long-term Evolution of the Short-term X-ray Variability of the Jetted TDE Swift J1644+57