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TDE Hosts are Green and Centrally Concentrated: Signatures of a Post-Merger System
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abstract
We study the properties of the galaxies hosting the first 19 tidal disruption events (TDEs) detected with the Zwicky Transient Facility (ZTF) within the context of a carefully constructed, representative host galaxy sample. We find that the ZTF sample of TDE hosts is dominated by compact "green valley" galaxies. After we restrict the comparison sample to galaxies with a similar concentration, as measured by Sersic index, we find this green valley over representation is even larger. That is, concentrated red sequence galaxies are not producing TDEs at elevated levels. We present host galaxy spectra which show that E+A galaxies are overrepresented in the ZTF sample by a factor of $\approx$22, which is lower than previous TDE host galaxy studies have found. We find that this overrepresentation can be fully accounted for when taking into account the masses, colors, and S\'ersic indices of the ZTF TDE hosts. The combination of both green colors and high S\'ersic index of the typical TDE host galaxy could be explained if the TDE rate is temporarily enhanced following a merger that leads to a higher central concentration of stars.
Forward citations
Cited by 4 Pith papers
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The Delay Time Distribution of Quasi-Periodic Eruptions
QPE host galaxies are more likely to have recently formed a large burst of stars (burst mass fraction above 1%) than TDE host galaxies or mass- and redshift-matched controls.
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ATLAS22kjn (AT 2022fpx): A Coronal Line Emitter with an Early Light Curve Bump and Mid-Infrared Dust Echo
The tidal disruption event ATLAS22kjn shows a resolved 9-day pre-peak bump, coronal lines that imply a stable ~1e6 K ionising source, and a dust echo whose covering fraction is much higher than typical TDEs.
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Binary disruptions driven by massive disks around massive black holes
Disk torques can drive stellar binaries around a massive black hole to tidal disruption, and the Milky Way's young stellar disk likely caused ~10^2 such events ~5 Myr ago.
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The Radio Properties of Extreme Coronal Line Emitters: Constraints on the Sub-parsec Environment
About half of low-redshift ECLEs are radio-bright like TDEs/AGN; SED modeling of four shows the ECL gas is clumpy (f_V ~ 10^{-5}-10^{-2}) and spatially distinct from the radio-emitting region.
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