lubang hitam
klandestin dapat mewakili populasi baru
Date:
June 28, 2016
Source:
International Centre for Radio Astronomy
Research (ICRAR)
Summary:
Astronomers have concluded that a peculiar source of radio waves thought to
be a distant galaxy is actually a nearby binary star system containing a
low-mass star and a black hole. This identification suggests there may be a
vast number of black holes in our Galaxy that have gone unnoticed until now.
Para astronom telah menyimpulkan bahwa sumber aneh gelombang radio dianggap galaksi
yang jauh sebenarnya adalah sebuah sistem bintang biner dekatnya yang berisi bintang
bermassa rendah dan lubang hitam. Identifikasi ini menunjukkan mungkin ada sejumlah
besar lubang hitam di galaksi kita yang telah pergi tanpa diketahui sampai sekarang.
............................
Para astronom telah menggabungkan data dari NASA Chandra X-ray Observatory,
Teleskop luar angkasa Hubble dan National Science Foundation Very Large Array (VLA)
untuk menyimpulkan bahwa sumber aneh gelombang radio dianggap galaksi yang jauh
sebenarnya sistem bintang biner terdekat yang berisi bintang bermassa rendah dan lubang hitam.
Identifikasi ini menunjukkan mungkin ada sejumlah besar lubang hitam di galaksi kita
yang telah pergi tanpa diketahui sampai sekarang.
Selama sekitar dua dekade, astronom telah mengetahui tentang obyek
disebut VLA J213002.08 + 120.904 (VLA J2130 + 12 for short). Meskipun dekat dengan
garis pandang ke gugus globular M15, banyak astronom berpikir bahwa sumber ini
gelombang radio yang cerah yang mungkin galaksi yang jauh.
Berkat pengukuran jarak baru dengan jaringan internasional teleskop radio, termasuk
EVN teleskop (European very Long Baseline Interferometry Network) teleskop,
NSF Green Bank Telescope dan Arecibo Observatory, para astronom menyadari
bahwa VLA J2130 + 12 adalah pada jarak 7.200 tahun cahaya ,
menunjukkan bahwa itu adalah baik dalam galaksi Bima Sakti kita
dan sekitar lima kali lebih dekat dari M15. Sebuah gambar yang mendalam dari
Chandra mengungkapkan hal itu hanya dapat memberi dari jumlah yang
sangat kecil dari sinar-X, sedangkan data VLA terbaru menunjukkan sumber tetap cerah
di gelombang radio.
............................
................................
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(European Very Long Baseline Interferometry Network) telescopes, the NSF's
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galaxy , binary star system , gelombang radio,galaksi, sistem bintang biner, NASA's Chandra X-ray Observatory,
the Hubble Space Telescope and the National Science Foundation's Karl G. Jansky
Very Large Array ,VLA, VLA J213002.08+120904, VLA J2130+12 for short, globular
cluster ,M15, EVN (European Very Long Baseline Interferometry Network)
telescopes, the NSF's Green Bank Telescope and Arecibo Observatory, 7,200 light
years, Milky Way galaxy ,Chandra, X-rays, galaksi Bima Sakti ,
............................
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Clandestine black hole may represent new population
Date:
June 28, 2016
Source:
International Centre for Radio Astronomy
Research (ICRAR)
Summary:
Astronomers have concluded that a peculiar source of radio waves thought to
be a distant galaxy is actually a nearby binary star system containing a
low-mass star and a black hole. This identification suggests there may be a
vast number of black holes in our Galaxy that have gone unnoticed until now.
............................
Astronomers have combined data from
NASA's Chandra X-ray Observatory, the Hubble Space Telescope and the National
Science Foundation's Karl G. Jansky Very Large Array (VLA) to conclude that a
peculiar source of radio waves thought to be a distant galaxy is actually a
nearby binary star system containing a low-mass star and a black hole. This
identification suggests there may be a vast number of black holes in our Galaxy
that have gone unnoticed until now.
For about two decades, astronomers have known about an object called VLA
J213002.08+120904 (VLA J2130+12 for short). Although it is close to the line of
sight to the globular cluster M15, most astronomers had thought that this
source of bright radio waves was probably a distant galaxy.
Thanks to recent distance measurements with an international network of
radio telescopes, including the EVN (European Very Long Baseline Interferometry
Network) telescopes, the NSF's Green Bank Telescope and Arecibo Observatory,
astronomers realized that VLA J2130+12 is at a distance of 7,200 light years,
showing that it is well within our own Milky Way galaxy and about five times
closer than M15. A deep image from Chandra reveals it can only be giving off a
very small amount of X-rays, while recent VLA data indicates the source remains
bright in radio waves.
This new study indicates that VLA J2130+12 is a black hole a few times the
mass of our Sun that is very slowly pulling in material from a companion star.
At this paltry feeding rate, VLA J2130+12 was not previously flagged as a black
hole since it lacks some of the telltale signs that black holes in binaries
typically display.
"Usually, we find black holes when they are pulling in lots of
material. Before falling into the black hole this material gets very hot and
emits brightly in X-rays," said Bailey Tetarenko of the University of
Alberta, Canada, who led the study. "This one is so quiet that it's
practically a stealth black hole."
This is the first time a black hole binary system outside of a globular
cluster has been initially discovered while it is in such a quiet state.
Hubble observations identified VLA J2130+12 with a star having only about
one-tenth to one-fifth the mass of the Sun. The observed radio brightness and
the limit on the X-ray brightness from Chandra allowed the researchers to rule
out other possible interpretations, such as an ultra-cool dwarf star, a neutron
star, or a white dwarf pulling material away from a companion star.
Because this study only covered a very small patch of sky, the implication
is that there should be many of these quiet black holes around the Milky Way.
The estimates are that tens of thousands to millions of these black holes could
exist within our Galaxy, about three to thousands of times as many as previous
studies have suggested.
"Unless we were incredibly lucky to find one source like this in a
small patch of the sky, there must be many more of these black hole binaries in
our Galaxy than we used to think," said co-author Arash Bahramian, also of
the University of Alberta.
There are other implications of finding that VLA J2130+12 is relatively
near to us.
"Some of these undiscovered black holes could be closer to the Earth
than we previously thought," said Robin Arnason, a co-author from Western
University, Canada "However there's no need to worry as even these black
holes would still be many light years away from Earth."
Sensitive radio and X-ray surveys covering large regions of the sky will
need to be performed to uncover more of this missing population.
If, like many others, this black hole was formed in the plane of the Milky
Way's disk, it would have needed a large kick at birth to launch it to its
current position about 3,000 light years above the plane of the Galaxy.
These results appear in a paper in The Astrophysical Journal. 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.
Story Source:
The above post is reprinted from materials provided
byInternational Centre for Radio
Astronomy Research (ICRAR). Note: Materials may be edited
for content and length.