2016MNRAS.461..371K

Query : 2016MNRAS.461..371K

2016MNRAS.461..371K - Mon. Not. R. Astron. Soc., 461, 371-384 (2016/September-1)

Tidal disruption event demographics.

KOCHANEK C.S.

Abstract (from CDS):

We survey the properties of stars destroyed in tidal disruption events (TDEs) as a function of black hole (BH) mass, stellar mass and evolutionary state, star formation history and redshift. For M_{BH}  mathrel 10^7 M_☉, the typical TDE is due to a M_* ∼ 0.3 M_☉ M-dwarf, although the mass function is relatively flat for M_* { <{∼}} M_☉. The contribution from older main-sequence stars and sub-giants is small but not negligible. From M_BH ≃ 107.5–108.5 M_☉, the balance rapidly shifts to higher mass stars and a larger contribution from evolved stars, and is ultimately dominated by evolved stars at higher BH masses. The star formation history has little effect until the rates are dominated by evolved stars. TDE rates should decline very rapidly towards higher redshifts. The volumetric rate of TDEs is very high because the BH mass function diverges for low masses. However, any emission mechanism which is largely Eddington-limited for low BH masses suppresses this divergence in any observed sample and leads to TDE samples dominated by M_BH ≃ 106.0–107.5 M_☉ BHs with roughly Eddington peak accretion rates. The typical fall-back time is relatively long, with 16 per cent having t_fb < 10^-1 yr (37 d), and 84 per cent having longer time-scales. Many residual rate discrepancies can be explained if surveys are biased against TDEs with these longer t_fb, which seems very plausible if t_fb has any relation to the transient rise time. For almost any BH mass function, systematic searches for fainter, faster time-scale TDEs in smaller galaxies, and longer time-scale TDEs in more massive galaxies are likely to be rewarded.

Abstract Copyright: © 2016 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: black holes - quasars: supermassive black holes - quasars: supermassive black holes

CDS comments: In chap. 3.2 : TDE1 = SDSS J234201.40+010629.2, TDE2 = SDSS J232348.61-010810.3.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PS1-11af ev 09 57 26.815 +03 14 01.00           ~ 71 0
2 2MASS J11084011+3405523 G 11 08 40.1149579272 +34 05 52.337925924           ~ 142 0
3 ZW VIII 211 rG 12 48 15.2253025968 +17 46 26.475426228   16.5       ~ 360 0
4 PTF 09axc SN* 14 53 13.06 +22 14 32.2           SNII 52 0
5 SN 2009bl SN* 15 16 31.50 +54 27 35.4           SNII 11 1
6 PS1-10jh ev 16 09 28.296 +53 40 23.52           ~ 153 0
7 PTF 09djl SN* 16 33 55.94 +30 14 16.3           SNII 74 0
8 Anon J232348-0108 G 23 23 48.615 -01 08 10.34           ~ 9 0
9 SDSS J234201.40+010629.2 G 23 42 01.4076801024 +01 06 29.333488176           ~ 6 0

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