Astronomers have discovered evidence for thousands of black holes
located near the center of our Milky Way galaxy using data from NASA's Chandra X-ray Observatory.
This black hole
bounty consists of stellar-mass black holes, which typically weigh
between five to 30 times the mass of the Sun. These newly identified
black holes were found within three light years
— a relatively short distance on cosmic scales — of the supermassive
black hole at our Galaxy's center known as Sagittarius A* (Sgr A*).
Theoretical studies of the dynamics of stars in galaxies have
indicated that a large population of stellar mass black holes — as many
as 20,000 — could drift inward over the eons and collect around Sgr A*.
This recent analysis using Chandra data is the first observational
evidence for such a black hole bounty.
A black hole by itself is invisible. However, a black hole — or neutron star — locked in close orbit with a star will pull gas from its companion (astronomers call these systems "X-ray binaries"). This material falls into a disk and heats up to millions of degrees and produces X-rays before disappearing into the black hole. Some of these X-ray binaries appear as point-like sources in the Chandra image.
A team of researchers, led by Chuck Hailey of Columbia University in New York, used Chandra data to search for X-ray binaries containing black holes that are located near Sgr A*. They studied the X-ray spectra — that is the amount of X-rays seen at different energies — of sources within about 12 light years of Sgr A*.
The team then selected sources with X-ray spectra similar to those of
known X-ray binaries, which have relatively large amounts of low energy
X-rays. Using this method they detected fourteen X-ray binaries within
about three light years of Sgr A*. Two X-ray sources likely to contain
neutron stars based on the detection of characteristic outbursts in
previous studies were then eliminated from the analysis.
The dozen remaining X-ray binaries are identified in the labeled
version of the image using red colored circles. Other sources with
relatively large amounts of high energy X-rays are labeled in white, and
are mostly binaries containing white dwarf stars.
Hailey and his collaborators concluded that a majority of these dozen
X-ray binaries are likely to contain black holes. The amount of
variability they have shown over timescales of years is different from
that expected for X-ray binaries containing neutron stars.
Only the brightest X-ray binaries containing black holes are likely
to be detectable at the distance of Sgr A*. Therefore, the detections in
this study imply that a much larger population of fainter, undetected
X-ray binaries — at least 300 and up to a thousand — containing
stellar-mass black holes should be present around Sgr A*.
This population of black holes with companion stars near Sgr A* could
provide insight into the formation of X-ray binaries from close
encounters between stars and black holes. This discovery could also
inform future gravitational wave research. Knowing the number of black
holes in the center of a typical galaxy can help in better predicting
how many gravitational wave events may be associated with them.
An even larger population of stellar-mass black holes without
companion stars should be present near Sgr A*. According to theoretical
follow-up work by Aleksey Generozov of Columbia and his colleagues, more
than about 10,000 black holes and as many as 40,000 black holes should
exist in the center of the Galaxy.
While the authors strongly favor the black hole explanation, they
cannot rule out the possibility that up to about half of the observed
dozen sources are from a population of millisecond pulsars, i.e., very
rapidly rotating neutron stars with strong magnetic fields.
A paper describing these results
appeared in the April 5th issue of the journal Nature. NASA's Marshall
Space Flight Center in Huntsville, Alabama, manages the Chandra program
for NASA's Science Mission Directorate in Washington. The Smithsonian
Astrophysical Observatory in Cambridge, Massachusetts, controls
Chandra's science and flight operations.
Fast Facts for Sagittarius A* Swarm:
Scale: Image is about 6 arcmin (45 light years) across
Category: Black Holes, Neutron Stars/X-ray Binaries
Coordinates (J2000): RA 17h 45m 40s | Dec -29° 00´ 28.00"
Constellation: Sagittarius
Observation Date: February 2002-April 2013
Observation Time: 389 hours 33 min (16 days 5 hours 33 min)
Obs. ID: 2943, 2951, 2952, 2953, 2954, 3392, 3393, 3663, 3665, 3549, 4683, 4684, 5950, 5951, 5952, 5953, 5954, 6363, 6113, 6639, 6640, 6641, 6642, 6643, 6644, 6645, 6646, 7554, 7555, 7556, 7557, 7558, 7559, 9169, 9170, 9171, 9172, 9173, 9174, 10556, 11843, 13016, 13017, 14941, 14942
Instrument: ACIS
References: Hailey, C et al, 2018, Nature, 556, 70
Color Code: X-ray Blue
Distance Estimate: About 26,000 light years
Source: NASA’s Chandra X-ray Observatory
