|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'585
Articles rated: 2609
24 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Soft X-ray Temperature Tidal Disruption Events from Stars on Deep Plunging Orbits | | Lixin Dai
; Jonathan C. McKinney
; M. Coleman Miller
; | | Date: |
15 Jul 2015 | | Abstract: | One of the puzzles associated with tidal disruption event candidates (TDEs)
is that there is a dichotomy between the color temperatures of ${
m few} imes
10^4$ K for TDEs discovered with optical and UV telescopes, and the color
temperatures of ${
m few} imes 10^5 - 10^6$ K for TDEs discovered with X-ray
satellites. Here we propose that high-temperature TDEs are produced when the
tidal debris of a disrupted star self-intersects relatively close to the SMBH,
in contrast to the more distant self-intersection that leads to lower color
temperatures. In particular, we note from simple ballistic considerations that
greater apsidal precession in an orbit is the key to closer self-intersection.
Thus larger values of $eta$, the ratio of the tidal radius to the pericenter
distance of the initial orbit, are more likely to lead to high temperatures.
For a given star and $eta$, apsidal precession also increases for larger
black hole masses, but larger black hole masses imply a lower temperature at a
fixed Eddington ratio. Thus the expected dependence of the temperature on the
mass of the black hole is non-monotonic. We find that in order to produce a
soft X-ray temperature TDE, a deeply plunging stellar orbit with $eta> 3$ is
needed and a black hole mass of $lesssim 5 imes 10^6 M_odot$ is favored.
Although observations of TDEs are comparatively scarce and are likely dominated
by selection effects, it is encouraging that both predictions are consistent
with current data. | | Source: | arXiv, 1507.4333 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER