2008A&A...481..259B

Query : 2008A&A...481..259B

2008A&A...481..259B - Astronomy and Astrophysics, volume 481, 259-277 (2008/4-2)

Shock waves in tidally compressed stars by massive black holes.

BRASSART M. and LUMINET J.-P.

Abstract (from CDS):

We investigate the case of a main-sequence star deeply penetrating the tidal radius of a massive black hole. We focus on the compression phase leading to a so-called pancake configuration of the star at the instant of greatest compression. The aim is to study the tidal compression process paying particular attention to the development of shock waves, to deduce reliable estimates of the thermodynamical quantities involved in the pancake star, and to solve a controversy about whether thermonuclear reactions can be triggered in the core of a tidally compressed star. We set up a one-dimensional hydrodynamical model adapted to the geometry of the problem. Based on the high-resolution shock-capturing Godunov-type approach, this model allows us to study the compression phase of the star in a direction orthogonal to its orbital plane. We show the existence of two regimes depending on whether shock waves develop before or after the instant of maximum core compression. In both cases we confirm that high compression and heating factors in the stellar core are able to trigger a thermonuclear explosion. Moreover, we show that the shock waves carry a brief but very high peak of temperature outwards from the centre to the surface of the star. We tentatively conclude that the phenomenon could give rise to hard electromagnetic radiation, to be compared to some GRB-type flares already observed in their host galaxies. Finally, we estimate that the rate of pancake stars should be about 10–5 per galaxy per year. If generated in hard X- or γ-ray bands, several events of this kind per year should be detectable within the full observable universe.

Abstract Copyright: ∼

Journal keyword(s): black hole physics - stars: evolution - galaxies: nuclei - hydrodynamics - shock waves - method: numerical

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14422 0

Query : 2008A&A...481..259B

Basic data :
NAME Galactic Center -- Region defined in the Sky
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
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    Grey values are increasing the original precision due to the computation of frame transformations
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  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		17 45 39.60213 -29 00 22.0000 (Gamma-ray) [ ] E 2018A&A...612A...1H
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		17 42 28.87566 -28 59 12.3570 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		359.94487501 -00.04391769 [ ]
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', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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NAME Gal Centre HESS J1745-290 NAME Gal Center TeV J1745-290
GAL 000.0+00.0 NAME Galactic Centre NAME Galactic Center VER J1745-290

References (14422 between 1850 and 2024) (Total 14422)
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