Astronomy 404
Lecture 39, Dec. 3
Fall 2021
Lecture Notes:
pdf file
Evidence for Black Holes
X-ray
binaries
:
Cygnus X-1
Milky Way center:
Radio
overview
The power of
adaptive optics
Stellar orbits:
Munich group
,
UCLA group
2020 Nobel Prize in Physics
possibly related: gamma-ray
bubbles
coming soon(?):
Event Horizon Telescope
image of a black hole, perhaps like
this
other galaxies
active galaxies:
M87
; AGN
gallery
gravitationally lensed quasar: the
Einstein cross
quasar and
host galaxies
supermassive black holes
black holes and galaxies somehow
know about each other
important clues: a binary supermassive black hole pairs and even
triples
! optical
detection
by our own
Prof. Xin Liu
,
X-ray
Imaging a Black Hole: M87
*
Virgo cluster
of galaxies
M87
at center
M87
jet: our closest AGN!
Event Horizon Telescope
:
array
expectations: black hole
ray tracing
,
simulations
EHT
image of M87
*
! time-resolved
version
; paper:
EHT Collaboration (2019)
putting it
all together
update with
magnetic field lines
seen via polarization (papers:
observation
,
theory
)
Black Holes and Gravitational Radiation
Theory: ripples in spacetime
Indirect evidence:
Hulse & Taylor's
award-winning
binary pulsar
Direct detection: gravity-wave observatories
Advanced
LIGO
: detectors in
Hanford
and
Livingston
VIRGO
: detector near
Pisa, Italy
the future:
LIGO India
,
KAGRA, Japan
,
LISA
Welcome to the era of
gravity
wave
astronomy!
merging
black
holes
scientific summary paper:
Abbott et al 2016
merging
neutron
stars
astrophysics:
sky localization
, observed
stellar graveyard masses
Nobel Prize 2017
: Rainer Weiss, Barry Barish, Kip Thorne
LIGO/Virgo
catalog from Nov 2021
,
masses plotted
, orbits
visualized
Binary Stars and Stellar Explosions
Binary Star Evolution
Lecture Archive
Brian D. Fields