Credit
X-ray: NASA/CXC/ISAS/A.Simionescu et al, Optical: DSS
A jet from a very distant black hole being illuminated by the leftover glow from the Big Bang, known as the cosmic microwave background (CMB), has been found as described in our latest press release.
Astronomers using NASA's Chandra X-ray Observatory discovered this
faraway jet serendipitously when looking at another source in Chandra's
field of view.
Jets in the early Universe such as this one, known as B3 0727+409,
give astronomers a way to probe the growth of black holes at a very
early epoch in the cosmos. The light from B3 0727+409 was emitted about
2.7 billion years after the Big Bang when the Universe was only about
one fifth of its current age.
This main panel graphic shows Chandra's X-ray data
that have been combined with an optical image from the Digitized Sky
Survey. (Note that the two sources near the center of the image do not
represent a double source, but rather a coincidental alignment of the
distant jet and a foreground galaxy.)
The inset shows more detail of the X-ray emission from the jet detected by Chandra. The length of the jet in 0727+409 is at least 300,000 light years.
Many long jets emitted by supermassive black holes have been detected
in the nearby Universe, but exactly how these jets give off X-rays has
remained a matter of debate. In B3 0727+409, it appears that the CMB is
being boosted to X-ray wavelengths.
Scientists think that as the electrons in the jet fly from the black
hole at close to the speed of light, they move through the sea of CMB
radiation and collide with microwave photons. This boosts the energy of
the photons up into the X-ray band to be detected by Chandra. If this is
the case, it implies that the electrons in the B3 0727+409 jet must
keep moving at nearly the speed of light for hundreds of thousands of
light years.
The significance of this discovery is heightened because astronomers
essentially stumbled across this jet while observing a galaxy cluster in
the field. Historically, such distant jets have been discovered in
radio waves first, and then followed up with X-ray observations to look
for high-energy emission. If bright X-ray jets can exist with very faint
or undetected radio counterparts, it means that there could be many
more of them out there because astronomers haven't been systematically
looking for them.
A paper describing these results was published in the 2016 January 1st issue of The Astrophysical Journal Letters and is available online.
The authors are Aurora Simionescu (Institute of Space and Astronautical
Science, Kanagawa, Japan), Lukasz Stawarz (Jagiellonian University,
Kraków, Poland), Yuto Ichinohe (Institute of Space and Astronautical
Science, Kanagawa, Japan), Teddy Cheung (Naval Research Laboratory,
Washington, DC), Marek Jamrozy (Jagiellonian University, Kraków,
Poland), Aneta Siemiginowska (Harvard-Smithsonian Center for
Astrophysics, Cambridge, MA), Kouichi Hagino (Institute of Space and
Astronautical Science, Kanagawa, Japan), Poshak Gandhi (University of
Southampton, Southampton, UK) and Norbert Werner (Stanford University,
Stanford, CA).
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 B3 0727+409:
Scale: Main image is 10 arcmin across (16 million light years); Inset image is 46 arcsec across (1.23 million light years)
Category: Quasars & Active Galaxies
Coordinates (J2000): RA 07h 30m 48.00s | Dec +40° 51' 10.00"
Observation Date: 15 Dec 2015
Observation Time: 5 hours 33 min.
Obs. ID: 17167
Instrument: ACIS
References: Simionescu, A. et al, 2015, ApJ, 816, 15; arXiv:1509.04822
Color Code: X-ray (Blue), Optical (Red, Green, Blue)
Distance Estimate: About 11.075 billion light years (z = 2.5)
Source: NASA’s Chandra X-ray Observatory
