The nuclear transient AT 2017gge: a tidal disruption event in a dusty and gas-rich environment and the awakening of a dormant SMBH
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The nuclear transient AT 2017gge : a tidal disruption event in a dusty and gas-rich environment and the awakening of a dormant SMBH. / Onori, F.; Cannizzaro, G.; Jonker, P. G.; Kim, M.; Nicholl, M.; Mattila, S.; Reynolds, T. M.; Fraser, M.; Wevers, T.; Brocato, E.; Anderson, J. P.; Carini, R.; Charalampopoulos, P.; Clark, P.; Gromadzki, M.; Gutierrez, C. P.; Ihanec, N.; Inserra, C.; Lawrence, A.; Leloudas, G.; Lundqvist, P.; Muller-Bravo, T. E.; Piranomonte, S.; Pursiainen, M.; Rybicki, K. A.; Somero, A.; Young, D. R.; Chambers, K. C.; Gao, H.; de Boer, T. J. L.; Magnier, E. A.
In: Monthly Notices of the Royal Astronomical Society, Vol. 517, No. 1, 04.10.2022, p. 76-98.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The nuclear transient AT 2017gge
T2 - a tidal disruption event in a dusty and gas-rich environment and the awakening of a dormant SMBH
AU - Onori, F.
AU - Cannizzaro, G.
AU - Jonker, P. G.
AU - Kim, M.
AU - Nicholl, M.
AU - Mattila, S.
AU - Reynolds, T. M.
AU - Fraser, M.
AU - Wevers, T.
AU - Brocato, E.
AU - Anderson, J. P.
AU - Carini, R.
AU - Charalampopoulos, P.
AU - Clark, P.
AU - Gromadzki, M.
AU - Gutierrez, C. P.
AU - Ihanec, N.
AU - Inserra, C.
AU - Lawrence, A.
AU - Leloudas, G.
AU - Lundqvist, P.
AU - Muller-Bravo, T. E.
AU - Piranomonte, S.
AU - Pursiainen, M.
AU - Rybicki, K. A.
AU - Somero, A.
AU - Young, D. R.
AU - Chambers, K. C.
AU - Gao, H.
AU - de Boer, T. J. L.
AU - Magnier, E. A.
PY - 2022/10/4
Y1 - 2022/10/4
N2 - We present the results from a dense multwavelength [optical/UV, near-infrared (IR), and X-ray] follow-up campaign of the nuclear transient AT 2017gge, covering a total of 1698 d from the transient's discovery. The bolometric light curve, the blackbody temperature and radius, the broad H and He i lambda 5876 emission lines and their evolution with time, are all consistent with a tidal disruption event (TDE) nature. A soft X-ray flare is detected with a delay of similar to 200 d with respect to the optical/UV peak and it is rapidly followed by the emergence of a broad He ii lambda 4686 and by a number of long-lasting high ionization coronal emission lines. This indicate a clear connection between a TDE flare and the appearance of extreme coronal line emission (ECLEs). An IR echo, resulting from dust re-radiation of the optical/UV TDE light is observed after the X-ray flare and the associated near-IR spectra show a transient broad feature in correspondence of the He i lambda 10830 and, for the first time in a TDE, a transient high-ionization coronal NIR line (the [Fe xiii] lambda 10798) is also detected. The data are well explained by a scenario in which a TDE occurs in a gas-and-dust rich environment and its optical/UV, soft X-ray, and IR emission have different origins and locations. The optical emission may be produced by stellar debris stream collisions prior to the accretion disc formation, which is instead responsible for the soft X-ray flare, emitted after the end of the circularization process.
AB - We present the results from a dense multwavelength [optical/UV, near-infrared (IR), and X-ray] follow-up campaign of the nuclear transient AT 2017gge, covering a total of 1698 d from the transient's discovery. The bolometric light curve, the blackbody temperature and radius, the broad H and He i lambda 5876 emission lines and their evolution with time, are all consistent with a tidal disruption event (TDE) nature. A soft X-ray flare is detected with a delay of similar to 200 d with respect to the optical/UV peak and it is rapidly followed by the emergence of a broad He ii lambda 4686 and by a number of long-lasting high ionization coronal emission lines. This indicate a clear connection between a TDE flare and the appearance of extreme coronal line emission (ECLEs). An IR echo, resulting from dust re-radiation of the optical/UV TDE light is observed after the X-ray flare and the associated near-IR spectra show a transient broad feature in correspondence of the He i lambda 10830 and, for the first time in a TDE, a transient high-ionization coronal NIR line (the [Fe xiii] lambda 10798) is also detected. The data are well explained by a scenario in which a TDE occurs in a gas-and-dust rich environment and its optical/UV, soft X-ray, and IR emission have different origins and locations. The optical emission may be produced by stellar debris stream collisions prior to the accretion disc formation, which is instead responsible for the soft X-ray flare, emitted after the end of the circularization process.
KW - black hole physics
KW - galaxies: active
KW - galaxies: nuclei
KW - infrared: galaxies
KW - X-rays: galaxies
KW - transients: tidal disruption events
KW - ACTIVE GALACTIC NUCLEI
KW - BLACK-HOLE MASSES
KW - X-RAY
KW - HOST GALAXIES
KW - FOLLOW-UP
KW - EMISSION-LINES
KW - TDE CANDIDATE
KW - LIGHT CURVES
KW - E PLUS
KW - STAR
U2 - 10.1093/mnras/stac2673
DO - 10.1093/mnras/stac2673
M3 - Journal article
VL - 517
SP - 76
EP - 98
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 322556472