Question:

Is this spectral material two years later in outflow 2022 (ref. 1)
same as spectral material in inflow 2018 of AT 2018hyz ?

I calculate (ref.3. r_star was about 7*10^9*cm, not good guess?, ref.2)
very rough value of r_T (ref. 2) which I got approximately
2*r_Schwarzschild ?

Best Regards,
Hannu Poropudas
Kolamäentie 9E, Kiiminki / Oulu, Finland.

References:

1. Cendes, Y., Berger, E., Alexander, K.D., Gomez, S., Hajela, A., Chornock, R., Laskar, T., Margutti, R., Metzger, B., Bietenholz, M.F., Brethaer, D., and Wieringa, M.H., 2022.
A Mildly Relativistic Outflow Launched Two Years after Disruption in Tidal Disruption Event AT 2018hyz.
The Astrophysical Journal 938:28 (14 pp), 2022 October 10.

2. Wong, T.H.T., Pfister, H., and Dai, L., 2022.
Revisiting the Rates and Demographics of Tidal Disruption Events: Effects of Disk Formation Efficiency.
The Astrophysical Journal Letters, 927:L19 (14 pp), 2022 March 1.
(AT 2018hyz
data (without error limits here for simplicity) is in
Table A1 Chosen TDE Candidates with Their Host-galaxy Properties.
Redshift = 0.0458,
sigma = 60 km*s^(-1),
log_10(M_BH,sigma/M_Sun) = 5.74,
log_10(M_BH,galaxy/M_sun) = 6.23,
log_10(M_galaxy/M_Sun) = 9.84,
log_10(L_bb,peak(ergs^(-1))) = 44.10.)
(Tidal disruption radius (r_T) of the black hole (BH):
r_T = approximately r_star*(k^2*M_BH/m_star)^(1/3)),
M_BH = the mass of the BH,
m_star = the mass of the star,
k = parameter that depends on details of the stellar structure, in this article
k = 1, for simplicity.)

3. Gomez, S. et al. 2022.
arXiv: 2003.05469v2 [astro-ph. HE], 26 Aug 2020, 11 pages.
(m_star = approximately 0.1*M_Sun,
M_BH = approximately 5.2*10^6*M_Sun.)

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