Do extremely reddened quasars extinguish star formation?

Do extremely reddened quasars extinguish star formation?
An artist's impression shows a very distant quasar powered by a black hole with a mass two billion times that of the Sun. Credit: ESO/M. Kornmesser

Galaxies formed and grew billions of years ago by accumulating gas from their surroundings, or colliding and merging with other young galaxies. These early stages of galaxy assembly are believed to be accompanied by episodes of rapid star formation, known as starbursts, and rapid growth of a single super-massive black hole in the galactic centers.

A popular paradigm for this evolution has the growing mostly in obscurity, buried deep within the dusty gas. These are rich star-forming galaxies until a blowout of gas and dust (outflow) extinguishes the star formation and halts further growth in the black holes. The outflow then reveals a luminous, rapidly growing black hole in the galactic nucleus. These are known as quasars.

Quasars can eject material at high speeds, possibly helping to drive the blowout and regulate in their . However, many aspects of this evolutionary scheme are not understood. Quasars that are partially obscured by dust, which reddens their light in a way that is similar to the sun viewed during sunsets on earth, might provide windows into galactic evolution during the brief transition stage when the starburst is winding down and the visibly luminous quasar is first being revealed in the galactic center.

New research, led by Frederick Hamann, a professor at the Department of Physics and Astronomy at University of California, Riverside, describes the discovery of a unique new population of extremely red quasars. The findings were recently published in the journal the Monthly Notices of the Royal Astronomical Society.

The work by Hamann, combined with previous research by Hamann and others, describes the discovery of the new population of extremely red quasars detected in the Baryon Oscillation Sky Survey (BOSS) of the Sloan Digital Sky Survey (SDSS).

The main goal of this study was to determine the size of the extremely red quasars population and characterize its basic properties compared to the much larger population of quasars in in the BOSS-SDSS survey overall.

The extremely red quasars were selected for study because of their extreme color, but the analysis by Hamann and his fellow researchers reveal a number of peculiar properties consistent with a unique and possibly young evolutionary stage. In particular, they have an exceptionally high incidence of powerful quasar-driven outflows that could be involved in galaxy-wide blowouts of gas and dust.

Overall, the gaseous environments around the black holes appear to be more extended and more energetic than the environments of normal quasars, which might occur at specific times when young gas-rich host galaxies are dumping prodigious amounts of matter into the central black holes, creating an exotic extreme variety of quasars.

More work is needed now to examine the extremely red quasars population further and understand its relationship to the general phenomenon of and, perhaps, to a particularly violent young phase of quasar-galaxy evolution.

The Monthly Notices of the Royal Astronomical Society paper is called "Extremely Red Quasers in BOSS."


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More information: Fred Hamann et al. Extremely red quasars in BOSS, Monthly Notices of the Royal Astronomical Society (2017). DOI: 10.1093/mnras/stw2387
Citation: Do extremely reddened quasars extinguish star formation? (2016, November 15) retrieved 22 September 2019 from https://phys.org/news/2016-11-extremely-reddened-quasars-extinguish-star.html
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Nov 15, 2016
In particular, they have an exceptionally high incidence of powerful quasar-driven outflows that could be involved in galaxy-wide blowouts of gas and dust.

So how are these quasars powered by accretion, they fail to ask? Why, because merger maniacs are forever maniacs, still holding out for hope of understanding!

Hint, the out-flowing gas originates from within the quasar... Nah, and global warming is a hoax!

Nov 16, 2016
"A popular paradigm for this evolution has the black holes growing mostly in obscurity, buried deep within the dusty gas."

"Black holes" interesting "body", instead that suck up all the matter around them, they gather material, spew, as, dragon fire, they hiccup when you eat too much .. whether, are these fairy tales of the Brothers Grimm?

Quasars are located in rapidly rotating galaxies (elliptical galaxies). Rapid rotation in the center of the galactic center creates a lot of friction particles in the cyclone which produces light (only at the poles where are cyclones).

"Observing the quasars through rotation" http://www.svemir...html#14b

Nov 16, 2016
So how are these quasars powered by accretion, they fail to ask?

Why do they 'fail to ask'. It's gravity (which has been told to you about a million times).

Go to wikipedia and look up "gravity" and "quasar". You will find all the answers you lack there.


Nov 16, 2016
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