3C 17 is a member of a newly identified galaxy cluster, observations reveal

**3C 17 is a member of a newly identified galaxy cluster, observations reveal
Broadband 0.5 − 2 keV (left panel) and 0.5 − 7 keV (right panel) ACIS-S flux images centered on 3C 17. Image credit: Madrid et al., 2018.

Using the Gemini Observatory and NASA's Chandra spacecraft, a team of astronomers has provided new information about the radio galaxy 3C 17 and its environment. The observations show that 3C 17 is the brightest member of a newly found galaxy cluster. The finding is reported in a paper published October 18 on arXiv.org.

Radio emit huge amounts of radio waves from their central cores. Black holes at the center of these galaxies are accreting gas and dust, generating high-energy jets visible in radio wavelengths, which accelerate electrically charged particles to high velocities.

Radio galaxies are observed to interact with their environment in often spectacular ways. For instance, in some of them, jets emanating from the central black hole are bent due to supersonic ram pressure of the intracluster medium.

At a redshift of 0.22, 3C 17 (also designated PKS 0035–02) is a broad-line radio galaxy showcasing strong indications of interaction with its environment. Previous observations of this galaxy found that its radio morphology is dominated by a single-sided, dramatically curved jet.

The remarkable morphology of 3C 17's radio jet, and several unclassified sources along the jet's path, motivated a group of astronomers led by Juan P. Madrid of Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Australia, to perform further studies of this galaxy. As part of their research, the team conducted observations of 3C 17 using the Gemini Multi Object Spectrograph (GMOS) of the Gemini Observatory, and analyzed observational data of this galaxy provided by NASA's Chandra X-ray spacecraft.

"An optical and X-ray study of 3C 17 and its environment was carried out using Gemini and Chandra data," the researchers wrote in the paper.

The observations allowed Madrid's team to identify a previously uncatalogued of galaxies at a redshift of 0.22, with a projected virial radius of about 1.2 million light years, and a velocity dispersion of around 821 km/s.

They found that 3C 17 belongs to this cluster and that with an absolute magnitude of –22.45 it is the brightest cluster member. Furthermore, the study also revealed that 3C 17 is dominated by broad emission lines.

"Its surface brightness profile is best fit with a double component model characteristic of BCGs [brightest cluster galaxies]," the paper reads.

Moreover, based on the analysis of Chandra data, the scientists uncovered the presence of extended soft X-ray emission surrounding 3C 17. They assume that this emission most likely has its origin in the hot gas of the intergalactic medium.

In concluding remarks, the authors of the paper say that 3C 17's membership in a explains its radio morphology. They noted that the jet of this galaxy is sharply curved as it propagates through a dense intracluster medium.

The researchers added that bent-tail like 3C 17 could be used by astronomers as signposts for distant galaxy clusters in wide-field -continuum surveys to be conducted in the future.


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More information: Juan P. Madrid et al. 3C 17: The BCG of a galaxy cluster at z=0.22. arXiv:1810.08274 [astro-ph.GA]. arxiv.org/abs/1810.08274

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Citation: 3C 17 is a member of a newly identified galaxy cluster, observations reveal (2018, October 29) retrieved 24 June 2019 from https://phys.org/news/2018-10-3c-member-newly-galaxy-cluster.html
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Oct 29, 2018
Radio galaxies are observed to interact with their environment in often spectacular ways. For instance, in some of them, jets emanating from the central black hole are bent due to supersonic ram pressure of the intracluster medium.


This "intracluster medium" needs to be rewritten so as avoid impinging on the sensitivities of dark matter Pop-Cosmology aficionados.

"supersonic ram pressure" ? The context being deciphered such as to give the impression there are intergalactic halo particles so close together they are in constant physical contact with one another, this of course means there's no room left for DM Cosmic Fairy Dust to perform it's powers of gravitational magic having been displaced by REAL stuff.


Oct 29, 2018
Radio galaxies are observed to interact with their environment in often spectacular ways. For instance, in some of them, jets emanating from the central black hole are bent due to supersonic ram pressure of the intracluster medium.


This "intracluster medium" needs to be rewritten so as avoid impinging on the sensitivities of dark matter Pop-Cosmology aficionados.

"supersonic ram pressure" ? The context being deciphered such as to give the impression there are intergalactic halo particles so close together they are in constant physical contact with one another, this of course means there's no room left for DM Cosmic Fairy Dust to perform it's powers of gravitational magic having been displaced by REAL stuff.



Dafuq are you talking about, thicko?

RNP
Oct 29, 2018
"Benni
This "intracluster medium" needs to be rewritten so as avoid impinging on the sensitivities of dark matter Pop-Cosmology aficionados.

"supersonic ram pressure" ? The context being deciphered such as to give the impression there are intergalactic halo particles so close together they are in constant physical contact with one another, this of course means there's no room left for DM Cosmic Fairy Dust to perform it's powers of gravitational magic having been displaced by REAL stuff.


I will never comprehend why you feel the need to comment on things you clearly do not understand.

There is absolutely no conflict with the presence of both dark matter and the intracluster (baryonic) medium. Where on Earth do you get the idea there is?

Ram pressure happens whenever two diffuse fluids pass through each other. There is no need for the particles to be "in constant physical contact with one another...". Again, you demonstrate a lack of understanding of physics.

Oct 29, 2018
@RNP
I will never comprehend why you feel the need to comment on things you clearly do not understand
for benji it's primarily the need for attention with certain other factors, like partial martyr-victim complex, blatant Dunning-Kruger and an inferiority complex which causes him to react with a defensive superiority complex (self-perceived: it's why he throws around Einstein quotes and other specific comments he doesn't understand in order to establish himself as "knowledgeable" in his mind or to others who don't comprehend the subject)

Oct 29, 2018
benni is one of the most popular of the lab-mice cultists and frauds used for thesis subject material. By the Mental Health and Social Sciences students monitoring this site.

If you abhor the conclusions advanced by those research programs? benni's lunacy has provided sufficient data for a slew of doctoral degrees. Providing us all, with yet another reason to hate his gibberish!

Oct 29, 2018
HAWW...HAWW...for benji...HEE...HEE.., blatant Dunning-Kruger and an inferiority complex which causes...HAWW..HAWW....

The StumPID jackass brays again.
For the jackass it is the need to hear it self bray. That's why its post are full of substance, that substance being the shit between its ears.

Oct 29, 2018
The jets are radio emissions, their hardly going to bend by ram pressure

Oct 29, 2018
HAWW...HAWW...for benji...HEE...HEE.., blatant Dunning-Kruger and an inferiority complex which causes...HAWW..HAWW....

The StumPID jackass brays again.
For the jackass it is the need to hear it self bray. That's why its post are full of substance, that substance being the shit between its ears.
says antigoracle

And, as you have probably noticed, Stumptydumpty NEVER has anything to say regarding any bright knowledge of sciencey facts and figures that he has learnt on his own, unless he copied and pasted it from Wiki and other sources from the internet. Then he will slice a piece off your comment and make idiotic suggestions on that. Then he will really become resentful that you have the nerve to be commenting on HIS physorg, and call you a liar and illiterate, as well as admonishing you to PROVE your assertions by giving HIM evidence of it.
LOL

Oct 29, 2018
Then he will really become resentful that you have the nerve to be commenting on HIS physorg,


For sure these two think this is THEIR website, and neither have put a cent into it.

Oct 30, 2018
Then he will really become resentful that you have the nerve to be commenting on HIS physorg,


For sure these two think this is THEIR website, and neither have put a cent into it.
says Benni

Well, perhaps stumptydumpty has made a big donation to one of physorg's sponsors. Or has a subscription to the "Health Plus 50" ad or some other ad. Who knows WHY stumptydumpby behaves as though he's the owner here. He does have a lot of followers (arse-kissing acolytes).
I think that they all get together offline at stumptydumpty's place to try to cast some spells and pray to Baphomet to give them control of everyone. And to make hundreds more sox. I thought that DaShiebo would be here by now so that he can tell SpookyOtto what he really thinks of him.
LOL

Oct 30, 2018
Then he will really become resentful that you have the nerve to be commenting on HIS physorg,


For sure these two think this is THEIR website, and neither have put a cent into it.


Still does not explain why you find it simply irresistible to put your ignorance on display every opportunity you get.
Really, why do you do it? You even seem proud of your stupidity. Different strokes for different folks I suppose.
How about joining the forum Benni?
Why are you so terrified of forums...
here can you handle this:
https://www.physicsforums.com

Oct 30, 2018
Well, perhaps stumptydumpty has made a big donation to one of physorg's sponsors. Or has a subscription to the "Health Plus 50" ad or some other ad. Who knows WHY stumptydumpby behaves as though he's the owner here. He does have a lot of followers (arse-kissing acolytes).
I think that they all get together offline at stumptydumpty's place to try to cast some spells and pray to Baphomet to give them control of everyone. And to make hundreds more sox. I thought that DaShiebo would be here by now so that he can tell SpookyOtto what he really thinks of him.
LOL


Maybe you should not be so surprised that people value science on a science site.
Maybe if you get that, you will understand why cranks and crackpots like yourself and Benni always get called out.

Maybe you are insane?
And maybe it's not a maybe...
have you thought of that?

Oct 30, 2018
The StumPID jackass brays again. For the jackass it is the need to hear it self bray. That's why its post are full of substance, that substance being the shit between its ears.


Says the jerk with a 50 word vocabulary (and a rather disturbing obsession with donkeys).

Nov 01, 2018
Where are you Benni, you coward?

Start a thread on Black holes, I double dare you.

Not man enough?

I didn't think so.

Nov 02, 2018
The StumPID jackass brays again. For the jackass it is the need to hear it self bray. That's why its post are full of substance, that substance being the shit between its ears.


Says the jerk with a 50 word vocabulary (and a rather disturbing obsession with donkeys)...HAWW....HAWW...HEE...HEE..

Says the jackass that's too stupid to know what it is. Hey jackass, you are not a donkey, one of your parents is.
LMAO.

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