Host Galaxy Line Diagnostics for the Candidate Tidal Disruption Events XMMSL1 J111527.3+180638 and PTF09axc
arXiv:2109.01092 · doi:10.1093/mnras/stab2541
Abstract
We present results of our analysis of spectra of the host galaxies of the candidate Tidal Disruption Events (TDEs) XMMSL1 J111527.3+180638 and PTF09axc to determine the nature of these transients. We subtract the starlight component from the host galaxy spectra to determine the origin of the nuclear emission lines. Using a Baldwin-Phillips-Terlevich (BPT) diagram we conclude that the host galaxy of XMMSL1 J111527.3+180638 is classified as a Seyfert galaxy, suggesting this transient is likely to be caused by (extreme) variability in the active galactic nucleus. We find that the host of PTF09axc falls in the 'star-forming' region of the BPT-diagram, implying that the transient is a strong TDE candidate. For both galaxies we find a WISE-colour difference of , which means there is no indication of a dusty torus and therefore an active galactic nucleus, seemingly contradicting our BPT finding for the host of XMMSL1 J111527.3+180638. We discuss possible reasons for the discrepant results obtained through the two methods.
arXiv comment7 pages, 6 figures, 1 table, 1 appendix (2 additional figures, 1 additional table). Accepted for publication in MNRAS
References in corpus (51)
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- The Host Galaxies of AGN
- Theoretical Modeling of Starburst Galaxies
- The Host Galaxies and Classification of Active Galactic Nuclei
- Cosmic-Ray Rejection by Laplacian Edge Detection
- Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
- The Atlas3D project -- I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria
- Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
- Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
- Alternative diagnostic diagrams and the "forgotten" population of weak line galaxies in the SDSS
- Cosmicflows-3
- Optical Flares from the Tidal Disruption of Stars by Massive Black Holes
- An ultraviolet-optical flare from the tidal disruption of a helium-rich stellar core
- A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
- Multiband lightcurves of tidal disruption events
- Six Months of Multi-Wavelength Follow-up of the Tidal Disruption Candidate ASASSN-14li and Implied TDE Rates from ASAS-SN
- PS1-10jh: The Disruption of a Main-Sequence Star of Near-Solar Composition
- A Bright Year for Tidal Disruptions?
- The Relationship of Hard X-ray and Optical Line Emission in Low Redshift Active Galactic Nuclei
- Flows of X-ray gas reveal the disruption of a star by a massive black hole
- Core-Collapse Supernovae from the Palomar Transient Factory: Indications for a Different Population in Dwarf Galaxies
- Optical-Ultraviolet Tidal Disruption Events
- PS16dtm: A Tidal Disruption Event in a Narrow-line Seyfert 1 Galaxy
- A radio jet from the optical and x-ray bright stellar tidal disruption flare ASASSN-14li
- Star formation histories of early-type galaxies. I: Higher order Balmer lines as age indicators
- Evolution of tidal disruption candidates discovered by XMM-Newton
- A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes
- Black hole masses of tidal disruption event host galaxies
- Evidence for rapid disk formation and reprocessing in the X-ray bright tidal disruption event AT 2018fyk
- X-ray Brightening and UV Fading of Tidal Disruption Event ASASSN-15oi
- Candidate tidal disruption events from the XMM-Newton Slew Survey
- An outflow powers the optical rise of the nearby, fast-evolving tidal disruption event AT2019qiz
- X-ray variability in a complete sample of Soft X-ray selected AGN
- A likely decade-long sustained tidal disruption event
- Tidal disruption events in active galactic nuclei
- Long-term stream evolution in tidal disruption events
- Implications from Late-Time X-ray Detections of Optically Selected Tidal Disruption Events: State Changes, Unification, and Detection Rates
- Disk Winds as an Explanation for Slowly Evolving Temperatures in Tidal Disruption Events
- Comparison of the X-ray emission from Tidal Disruption Events with those of Active Galactic Nuclei
- Enhanced activity of massive black holes by stellar capture assisted by a self-gravitating accretion disc
- Star-disc interaction in galactic nuclei: orbits and rates of accreted stars
- IC 3599 did it again: A second outburst of the X-ray transient Seyfert 1.9 Galaxy
- Multiple tidal disruption flares in the active galaxy IC 3599
- X-ray properties of TDEs
- Distinguishing Tidal Disruption Events from Impostors
- SDSS-IV eBOSS Spectroscopy of X-ray and WISE AGN in Stripe 82X: Overview of the Demographics of X-ray and Mid-Infrared Selected Active Galactic Nuclei
- Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg
- Was the soft X-ray flare in NGC 3599 due to an AGN disc instability or a delayed tidal disruption event?
- Light curves of tidal disruption events in active galactic nuclei
- Measuring the level of nuclear activity in Seyfert galaxies and the unification scheme
- Extreme variability in an active galactic nucleus: Gaia16aax