Ultra-luminous infrared galaxy with strong ionized-gas outflow discovered

**Ultra-luminous infrared galaxy with strong ionized-gas outflow discovered
AKARI Wide-S 90-µm and VLA FIRST 21-cm images of AKARI-FIS-V2 J0916248+073034. Credit: Chen et al., 2019.

Japanese astronomers report the identification of a new ultra-luminous infrared galaxy (ULIRG) as part of the search for far-infrared-bright but optically faint objects. The newly detected ULIRG, designated AKARI-FIS-V2 J0916248+073034, exhibits a strong ionized gas outflow. A paper detailing the discovery was published January 17 on arXiv.org.

With infrared luminosities of over 1 trillion solar luminosities and star formation rates between 100 and 1,000 solar masses per year, ULIRGs are the most intensely star-forming galaxies in the local universe. Hence, finding new galaxies of this type could be important for improving the understanding of star formation and evolution.

A team led by Xiaoyang Chen of Tohoku University in Japan is interested in detecting new objects of the ULIRG population. They are constructing a sample of ULIRGs at intermediate redshifts (between 0.5 an 1.0). For this purpose, they have performed an optical follow-up program for far-infrared sources available in the AKARI Far-Infrared Surveyor (FIS) Bright Source catalog by using optical imaging data from the Sloan Digital Sky Survey (SDSS).

Their study resulted in the discovery of a new ULIRG at a redshift of approximately 0.5, which received designation AKARI-FIS-V2 J0916248+073034, or J0916a for short. "In this paper we report a discovery of one ULIRG selected from AKARI 90-μm FIR survey, AKARI-FIS-V2 J0916248+073034 (hereafter J0916a)," the researchers wrote in the paper.

According to the study, J0916a has a total infrared luminosity of about 6.13 trillion solar luminosities and an estimated star formation rate of nearly 1,000 solar masses per year. The galaxy's stellar mass was calculated to be around 94.6 billion solar masses.

The researchers found that J0916a showcases signatures of an extremely strong outflow in its emission line profiles. They noted that high- and low-ionization potential lines show large velocity dispersions and shifts in relative to the stellar absorption lines. "J0916a shows extreme outflow not only in the [O III] emission line, but also in the [O II] emission line," the paper reads.

The study reveals that the outflow in J0916a most likely extends to a radius of about 13,000 light years. The astronomers say that this outflow is among the most powerful observed in ULIRGs and quasars at redshifts between 0.3 and 1.6, as it has the mass outflow and energy ejection rates estimated to be at a level of around 500 per year and approximately 400 tredecillion erg/second respectively.

Given that J0916a exhibits such strong outflow and an intense star formation process, the authors of the paper assume that the star-forming region of the galaxy has not yet been severely affected by the outflow.

In concluding remarks, the researchers suggest further observations of J0916a in order to reveal the properties and origins of the outflow. For instance, they propose spectroscopy observations with higher spatial and spectral resolution to determine the in the outflowing gas, and integral-field spectroscopy to investigate the structure of the outflow.


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More information: Xiaoyang Chen et al. Discovery of a strong ionized-gas outflow in an AKARI-selected Ultra-luminous Infrared Galaxy at z = 0.5. arXiv:1901.05618 [astro-ph.GA]. arxiv.org/abs/1901.05618

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Citation: Ultra-luminous infrared galaxy with strong ionized-gas outflow discovered (2019, January 29) retrieved 17 June 2019 from https://phys.org/news/2019-01-ultra-luminous-infrared-galaxy-strong-ionized-gas.html
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Jan 29, 2019
Given that J0916a exhibits such strong outflow and an intense star formation process, the authors of the paper assume that the star-forming region of the galaxy has not yet been severely affected by the outflow.

The key word above is 'assume', as a committed merger maniac must. So where is the inflow producing 1000 star masses per year? Look, ultra-luminous, because the core star is ultra-massive, and therefore ultra-active in producing all this new matter flowing out therefrom. Just because you can't understand how, does not mean it is not happening.

Where is the alternate explanation for the source of the material outflow from the committed merger maniac? No mention?

Jan 29, 2019
^^^^This place is full of fruitloops!

Jan 29, 2019
oh jd you gotta realize by now that the tuxfart is one of those yec wooloons preaching that the the unresolved information "outflows" from the electrically-charged aether-plasma continuous creation process.
Are spewing out of the BH Singularities.

Using that which they deny exists to "prove" there was no BB mo BH or DM or DE.
No Gravity or lightspeed constant in an expanding Universe.
No GR or SR or QM with Relativity or Probability.

& it doesn't matter (ahem) that they use the technology based upon from the very Sciences they denounce & deny.
To propagandize their sloppy nonsense to the gullible.

Jan 29, 2019
Where is the alternate explanation for the source of the material outflow from the committed merger maniac? No mention?

Tuxford---You keep mentioning your pet alternate explanation over and over again without realizing that all you're doing is revealing to the whole world:

1) Your ignorance--which is apparent to most of the people who read these articles and to any person involved with the research.
2) Your arrogance--thinking you're not ignorant and know better than everyone else--which combined with your ignorance makes you insufferable.
3) Your blindness to your ignorance and arrogance--which is why you persist in your delusions.

If all you reveal is pitiable. That's all you'll get from the world.

I hope someday you realize, having abated your ignorance and arrogance, that this comment is a gift to you.

Jan 29, 2019
@JD

just wait for cantthink and the eu loonies to arrive...

Jan 29, 2019
From article:
...outflow is among the most powerful observed in ULIRGs and quasars at redshifts between 0.3 and 1.6, as it has the mass outflow and energy EJECTION RATES estimated to be at a level of around 500 SOLAR MASSES PER YEAR and approximately 400 tredecillion erg/second respectively.
That huge amount of ordinary matter per year, times (let's say) 5 BILLION years, adds up to VAST amounts of 'ordinary' matter still existing in deep space around/between each/all galaxies in any cluster!

Hence the actual mass of 'previously/still' too faint to 'see'' ORDINARY matter that must be there and we're only just beginning to detect it all with better scopes/reviews....as recent mainstream observations/reviews keep indicating is the trend now which cannot the denied (except by those who cannot/will not re-think it all through for themselves; because they are stuck in old/naive inculcated assumptions/interpretations/paradigms which blind them to new evidence).

QED. :)

Jan 29, 2019
unrealcheckbounced. the only time ypu get to use QED?
Is as an acronym for
Qualified Evidence Disregarded!

Jan 29, 2019
There are some very complicated issues of galaxy formation. Unfortunately, here is the same problem as with the stars. The origin of galaxies remains unclear, in spite of huge activity in the field. What the "formation" means? It means that we have the material that is assembling into galaxies.
https://www.acade...ome_From
https://www.acade...rvations

Jan 29, 2019
@rrwillsj.
unrealcheckbounced. the only time ypu get to use QED?
Is as an acronym for
Qualified Evidence Disregarded!
Are you going to continue like that for the rest of your life, and so die an idiot, @rrwillsj? Or are you going to actually read and learn from what I just pointed out for all to check out for themselves? Yes, mate, even idiots like you can learn sometimes; if they try really, really, really hard not to be so pathetically idiotic for one moment. :)

Jan 30, 2019
Where is the alternate explanation for the source of the material outflow from the committed merger maniac? No...

Tuxford---You keep mentioning your pet alternate explanation over and over again without realizing that all you're doing is revealing to the whole world:

1) Your ignorance--which is apparent to most of the people who read these articles and to any person involved with the research.
2) Your arrogance--thinking you're not ignorant and know better than everyone else--which combined with your ignorance makes you insufferable.
3) Your blindness to your ignorance and arrogance--which is why you persist in your delusions.

If all you reveal is pitiable. That's all you'll get from the world.

I hope someday you realize, having abated your ignorance and arrogance, that this comment is a gift to you.
says dsylvan

Tuxford asked: "So where is the inflow producing 1000 star masses per year?"
And all YOU did was give a rundown of character/personality

Jan 30, 2019
Tuxford asked: "So where is the inflow producing 1000 star masses per year?"
And all YOU did was give a rundown of character/personality

SEU----Fair enough--I'm meta-commenting on character/personality--but then you did exactly that, didn't you?

Tuxford's question is sarcasm--he's not interested in any answer that doesn't match the ones he's already decided on. He's only asking it to disparage the serious folks who are actually trying to find the real answers. You exhibit similar behavior. It's obnoxious.

Character and personality are important to a public discussion. Do you really expect that you or Tuxford can come to a public forum and display poor character and personality and not have someone take you to task for it?

Or are you a troll, and that'a exactly what you're looking for?

Jan 30, 2019
Committed merger maniacs are desperate for good news. So they lash out at me for pointing out the obvious problems. They are not interested in real understanding, as it would contradict their favorite fantasy. I too would be embarrassed for claiming fantasy as reality for so much of their careers.

In my view, their exists a logical explanation for most recent contrary observations. It is just too much for most, as it requires a technical view beyond the tool set common to the common merger maniac. It requires a detailed systems view not taught much outside electrical engineering. This is troubling to the intellectual egomaniac trained as a physical scientist, who thinks he already knows it all.

If someone is actually interested, we can get into it. But for most here, they are not.

Jan 30, 2019
....They are not interested in real understanding, as it would contradict their favorite fantasy. I too would be embarrassed for claiming fantasy as reality for so much of their careers...
...This is troubling to the intellectual egomaniac trained as a physical scientist, who thinks he already knows it all.

You're exactly describing yourself.
If someone is actually interested, we can get into it. But for most here, they are not.

Of course. No one with any real interest in scientific discipline wants to join you in the little bubble world where only your opinion has any value. You have my sympathy for how lonely your world must be. But that's apparently how you like it.

Jan 30, 2019
Anyone expecting rc or seu to practice what they preach?

anyone at all?

chirp-chirp-cchirp
the mating call of the wooloons.

brings up a glaring point...
if all the accredited Scientists & academics are in this vast global conspiracy against you hucksters?
you should learn to pay attention.
take a hint,
grow up
& go back to your cesspool of fraud.

Jan 30, 2019
@rrwillsj.
Anyone expecting rc.... to practice what they preach?
How long before you learn to discern that I am a sole researcher independent of any 'group' or 'gang' here, mate? Anyway, what "practice/preaching' are you referring to in relation to myself (ie, an objective atheist and scientist), who is increasingly being confirmed correct all along by mainstream discovery/reviews of late?
brings up a glaring point...
if all the accredited Scientists & academics are in this vast global conspiracy against you hucksters?
Collective Inculcated Stupidity/Denial/Cowardice etc is not necessarily a 'conspiracy' as such; it is more a self-evident SYMPTOM of the well-known and feared HERD MENTALITY and PUBLISH OR PERISH etc 'academic hacks imperatives' which patently has driven all the nonsense from BB etc theorists/promulgators, DESPITE ever-increasing evidence to the contrary.
grow up & go back to your cesspool...
Good advice....for yourself, @rr! Discern better. :)

Jan 31, 2019
sorry - double and triple posts

Jan 31, 2019
Tuxford asked: "So where is the inflow producing 1000 star masses per year?"
And all YOU did was give a rundown of character/personality

SEU----Fair enough--I'm meta-commenting on character/personality--but then you did exactly that, didn't you?

Tuxford's question is sarcasm--he's not interested in any answer that doesn't match the ones he's already decided on. He's only asking it to disparage the serious folks who are actually trying to find the real answers. You exhibit similar behavior. It's obnoxious.

Character and personality are important to a public discussion. Do you really expect that you or Tuxford can come to a public forum and display poor character and personality and not have someone take you to task for it?

Or are you a troll, and that'a exactly what you're looking for?
says dsylvan

I don't react to Tux's posts, nor do I object to his right to express his opinions. Tux is one of the few polite people in physorg, which is appreciated

Jan 31, 2019
According to the study, J0916a has a total infrared luminosity of about 6.13 trillion solar luminosities and an estimated star formation rate of nearly 1,000 solar masses per year. The galaxy's stellar mass was calculated to be around 94.6 billion solar masses
Are these outflows between two galaxies with stars forming in the outflows

Feb 01, 2019
I don't care which pile of shit you wooloons are attempting to palm off to the gullible.

Call yourselves anything you want. Call yourselves faerie princess for all I care.

Yeah, that's a hint you should have shaved your legs before putting on the ruffled tutu.

I have no patience for the moderating whine that I should be polite to hucksters.
If you think that I am being discourteous to their sensitive feelings?
When did you ever hold them accountable for their accusations of crimes they claim are being committed by scientists & academics?
Their denunciation of researchers for expressing opinions that the wooloons did not approve of.

They are the agents of a blatant campaign at agitprop to discredit the sciences as they had done to the arts.

Worst of all? Their anti-vaxx campaign has resulted, internationally in the deaths of uncounted numbers of ignorant people. & is today killing gullible adults & uncomprehending children.
Denunciation cuts both ways!

Feb 01, 2019
@rrwillsj.
I have no patience for the moderating whine that I should be polite to hucksters.
If you think that I am being discourteous to their sensitive feelings? When did you ever hold them accountable for their accusations of crimes they claim are being committed by scientists & academics?
Calm down, mate. Try to better discern between interlocutors and content/context. Your 'blanket' trolling attacks are only bringing disrepute to your own intellect/objectivity and whatever your (hopefully honorable) agenda is here. Sure, refute/challenge real 'woo mongers' etc as you see fit; BUT while doing so, try harder to resist 'overflowing' your anger onto areas and posters who (eg, myself) are merely addressing on-topic science/logics issues/points under discussion. As independent objective scientific researcher, fairminded atheist myself, I don't take it kindly when your 'scattergun' attacks include ME; especially as I've proven on-topic AND correct re ACTUAL science. :)

Feb 04, 2019
So I just went here because there were so many comments, but as soon as the article said "electron density" I suspected some crackpots not satisfied with where galaxy science goes has commented.

The very first comment:
The key word above is 'assume', as a committed merger maniac must. So where is the inflow producing 1000 star masses per year?


There are no everyday "assumptions" in science, they simply put a constraint hypothesis that follows from the observations of strong outflow but still an large star formation. This is independent of where the gas comes from, it is obviously available so not a primary problem or a search for "alternative" (to what)?.

I don't know what a 'merger maniac' would be, galaxy mergers are also observed. Are you suggesting the gas comes from mergers? That is not a claim made in the article.

Feb 04, 2019
It requires a detailed systems view not taught much outside electrical engineering


Lol.

Feb 04, 2019
There are no everyday "assumptions" in science, they simply put a constraint hypothesis that follows from the observations of strong outflow but still an large star formation. This is independent of where the gas comes from, it is obviously available so not a primary problem or a search for "alternative" (to what)?.

I don't know what a 'merger maniac' would be, galaxy mergers are also observed. Are you suggesting the gas comes from mergers?


Merger maniac:
Trusting physical scientist who believes in a single magic moment where all mass was initially created, and thereafter condenses and merges into larger structures such as stars. The merger maniac is therefore only confused about the one single magic moment, rather than a continuous succession of magic moments where new matter is instead created on an ongoing basis, largely deep within the fertile cores of the largest stars where this process is thereby hidden from inspection. (Hint: Matter is energy.)

Feb 04, 2019
There are no everyday "assumptions" in science, they simply put a constraint hypothesis that follows from the observations of strong outflow but still an large star formation. This is independent of where the gas comes from, it is obviously available so not a primary problem or a search for "alternative" (to what)?.

I don't know what a 'merger maniac' would be, galaxy mergers are also observed. Are you suggesting the gas comes from mergers?


Merger maniac:
Trusting physical scientist who believes in a single magic moment where all mass was initially created, and thereafter condenses and merges into larger structures such as stars. The merger maniac is therefore only confused about the one single magic moment, rather than a continuous succession of magic moments where new matter is instead created on an ongoing basis, largely deep within the fertile cores of the largest stars where this process is thereby hidden from inspection. (Hint: Matter is energy.)

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