TDE Hosts are Green and Centrally Concentrated: Signatures of a Post-Merger System

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 Sérsic indices of the ZTF TDE hosts. The combination of both green colors and high Sérsic 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.

arXiv comment12 pages, 5 figures, submitted to ApJL

References in corpus (32)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The Host Galaxies of AGN
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The physical properties of star forming galaxies in the low redshift universe
• Theoretical Modeling of Starburst Galaxies
• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The Zwicky Transient Facility: Science Objectives
• The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies
• A Catalog of Bulge+Disk Decompositions and Updated Photometry for 1.12 Million Galaxies in the Sloan Digital Sky Survey
• A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
• The DEEP Groth Strip Survey II. Hubble Space Telescope Structural Parameters of Galaxies in the Groth Strip
• Rates of Stellar Tidal Disruption as Probes of the Supermassive Black Hole Mass Function
• The Zwicky Transient Facility: Surveys and Scheduler
• Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
• Six Months of Multi-Wavelength Follow-up of the Tidal Disruption Candidate ASASSN-14li and Implied TDE Rates from ASAS-SN
• A catalog of bulge, disk, and total stellar mass estimates for the Sloan Digital Sky Survey
• Tidal Disruption Events Prefer Unusual Host Galaxies
• Optical-Ultraviolet Tidal Disruption Events
• The Detailed Evolution of E+A Galaxies into Early Types
• Tidal Disruption Event Host Galaxies in the Context of the Local Galaxy Population
• Discovery and Follow-up of ASASSN-19dj: An X-ray and UV Luminous TDE in an Extreme Post-Starburst Galaxy
• Black hole masses of tidal disruption event host galaxies II
• The Role of Mergers in Early-type Galaxy Evolution and Black Hole Growth
• A dependence of the tidal disruption event rate on global stellar surface mass density and stellar velocity dispersion
• An enhanced rate of tidal disruptions in the centrally overdense E+A galaxy NGC 3156
• The Delay Time Distribution of Tidal Disruption Flares
• The Post-Starburst Evolution of Tidal Disruption Event Host Galaxies
• MUSE Reveals a Recent Merger in the Post-starburst Host Galaxy of the TDE ASASSN-14li
• The Structure of Tidal Disruption Event Host Galaxies on Scales of Tens to Thousands of Parsecs

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