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Discovery of a Mid-infrared Echo from the TDE Candidate in the Nucleus of ULIRG F01004−2237

Dou, Liming and Wang, Tinggui and Yan, Lin and Jiang, Ning and Yang, Chenwei and Cutri, Roc M. and Mainzer, Amy and Peng, Bo (2017) Discovery of a Mid-infrared Echo from the TDE Candidate in the Nucleus of ULIRG F01004−2237. Astrophysical Journal Letters, 841 (1). Art. No. L8. ISSN 2041-8213.

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We present the mid-infrared (MIR) light curves (LCs) of a tidal disruption event candidate in the center of a nearby ultraluminous infrared galaxy F01004−2237 using archival WISE and NEOWISE data from 2010 to 2016. At the peak of the optical flare, F01004−2237 was IR quiescent. About three years later, its MIR fluxes have shown a steady increase, rising by 1.34 and 1.04 mag in 3.4 and 4.6 μm up to the end of 2016. The host-subtracted MIR peak luminosity is 2–3 × 10^(44) erg s^(−1). We interpret the MIR LCs as an infrared echo, i.e., dust reprocessed emission of the optical flare. Fitting the MIR LCs using our dust model, we infer a dust torus of the size of a few parsecs at some inclined angle. The derived dust temperatures range from 590–850 K, and the warm dust mass is ~7 M_⊙. Such a large mass implies that the dust cannot be newly formed. We also derive the UV luminosity of 4–11 × 10^(44) erg s^(−1). The inferred total IR energy is 1–2 × 10^(52) erg, suggesting a large dust covering factor. Finally, our dust model suggests that the long tail of the optical flare could be due to dust scattering.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Dou, Liming0000-0002-4757-8622
Wang, Tinggui0000-0002-1517-6792
Yan, Lin0000-0003-1710-9339
Jiang, Ning0000-0002-7152-3621
Yang, Chenwei0000-0003-4975-2433
Cutri, Roc M.0000-0002-0077-2305
Additional Information:© 2017. The American Astronomical Society. Received 2017 March 15. Accepted 2017 May 3. Published 2017 May 17. We are grateful to the anonymous referee for comments that have improved the quality of this Letter. We thank Wenbin Lu for helpful discussions and comments. This research is supported by the National Basic Research Program of China (grant No. 2015CB857005), NSFC (NSFC-11233002, NSFC-11421303, NSFC-11603021), Joint Research Fund in Astronomy (U1431229, U1531245) under cooperative agreement between the NSFC and the CAS and the Fundamental Research Funds for the Central Universities. This research makes use of data products from the Wide-field Infrared Survey Explorer (WISE) and the Near-earth Object Wide-field Infrared Survey Explorer (NEOWISE). WISE is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology; NEOWISE is a project of the Jet Propulsion Laboratory/California Institute of Technology. WISE and NEOWISE are funded by the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Basic Research Program of China2015CB857005
National Natural Science Foundation of ChinaNSFC-11233002
National Natural Science Foundation of ChinaNSFC-11421303
National Natural Science Foundation of ChinaNSFC-11603021
Joint Research Fund in AstronomyU1431229
Joint Research Fund in AstronomyU1531245
Subject Keywords:black hole physics; galaxies: nuclei; infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20170518-070049825
Persistent URL:
Official Citation:Liming Dou et al 2017 ApJL 841 L8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77544
Deposited By: Ruth Sustaita
Deposited On:18 May 2017 16:30
Last Modified:09 Mar 2020 13:19

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