Optical Imaging & Spectral Study of FR-I Type Radio Galaxy:CTD 086 (B2 1422+26B)

TL;DR

This study provides optical imaging and spectroscopic analysis of the FR I radio galaxy CTD 086, revealing its elliptical morphology, narrow-line AGN characteristics, and estimating its central black hole mass.

Contribution

It offers detailed morphological, spectral, and kinematic analysis of CTD 086, including black hole mass estimation, based on HST and SDSS data.

Findings

Galaxy is an E2 elliptical with no stellar disk.

Optical spectra show only narrow emission lines.

Black hole mass estimated at approximately 8.8 million solar masses.

Abstract

We present optical imaging and spectroscopic studies of the Fanaroff \& Riley class I (FR I) radio galaxy CTD 086 based on Hubble Space Telescope (HST) and Sloan Digital Sky Survey (SDSS) observations. We use isophote shape analysis to show that there is no stellar disk component within CTD 086 and further that the morphological class of the galaxy is most likely E2. Optical spectroscopy of this galaxy reveals the presence of narrow emission lines only, and thus it qualifies to be termed as a narrow-line radio galaxy (type 2 AGN). We also extract stellar kinematics from the absorption-line spectra of CTD 086 using Penalized Pixel-Fitting method and derive the black hole mass MBH to be equal to (8.8\pm2.4)\times10^{7} Msun.