#sgra — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #sgra, aggregated by home.social.
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ALMA Discovers “Space Tornadoes” Around the Milky Way’s Core!
Although the galaxy’s central molecular zone (CMZ) has long been known to be filled with swirling dust and gas molecules cycling through formation and destruction, the mechanism that drives this process has remained elusive. Molecules serve as tracers for various processes in molecular clouds, with silicon monoxide (SiO) particularly useful in detecting the presence of shock waves.
Using ALMA’s high resolution and sensitivity to map distinct spectral lines within the molecular clouds at the center of the Milky Way, the team led by Kai Yang (Shanghai Jiao Tong University) has delineated a new type of long, narrow filamentary structure at a significantly finer scale. The dynamic interaction between this turbulent environment and the slim filaments produced as shocks ripple through provides a more complete view of the cyclical processes within the CMZ.
Yang’s team reports it remains unknown how these slim filaments initially arise, but shock processes emerge as a likely explanation.
More info at https://www.almaobservatory.org/en/press-releases/alma-discovers-space-tornadoes-around-the-milky-ways-core/
#ALMA #AtacamaLargeMillimeterSubmillimeterArray #AtacamaLargeMillimeterArray #MilkyWay #CMZ #CentralMolecularZone #SgrA* #GalacticCenter
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#DerStandard:
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Bild des Schwarzen Lochs im Zentrum der Milchstraße soll fehlerhaft seinEin japanisches Forschungsteam äußert Zweifel an der berühmten Aufnahme. Der dunkle Fleck soll ein Artefakt sein. Fachleute verteidigen das Bild
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https://www.derstandard.at/story/3000000242231/bild-des-schwarzen-lochs-im-zentrum-der-milchstrasse-soll-fehlerhaft-sein29.10.2024
#Astronomie #Bildanalyse #EHT #EHTC #Japan #M87 #NAOJ #SagittariusA* #SchwarzesLoch #SgrA* #SMHB #VLBI
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#DerStandard:
"
Bild des Schwarzen Lochs im Zentrum der Milchstraße soll fehlerhaft seinEin japanisches Forschungsteam äußert Zweifel an der berühmten Aufnahme. Der dunkle Fleck soll ein Artefakt sein. Fachleute verteidigen das Bild
"
https://www.derstandard.at/story/3000000242231/bild-des-schwarzen-lochs-im-zentrum-der-milchstrasse-soll-fehlerhaft-sein29.10.2024
#Astronomie #Bildanalyse #EHT #EHTC #Japan #M87 #NAOJ #SagittariusA* #SchwarzesLoch #SgrA* #SMHB #VLBI
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#DerStandard:
"
Bild des Schwarzen Lochs im Zentrum der Milchstraße soll fehlerhaft seinEin japanisches Forschungsteam äußert Zweifel an der berühmten Aufnahme. Der dunkle Fleck soll ein Artefakt sein. Fachleute verteidigen das Bild
"
https://www.derstandard.at/story/3000000242231/bild-des-schwarzen-lochs-im-zentrum-der-milchstrasse-soll-fehlerhaft-sein29.10.2024
#Astronomie #Bildanalyse #EHT #EHTC #Japan #M87 #NAOJ #SagittariusA* #SchwarzesLoch #SgrA* #SMHB #VLBI
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#DerStandard:
"
Bild des Schwarzen Lochs im Zentrum der Milchstraße soll fehlerhaft seinEin japanisches Forschungsteam äußert Zweifel an der berühmten Aufnahme. Der dunkle Fleck soll ein Artefakt sein. Fachleute verteidigen das Bild
"
https://www.derstandard.at/story/3000000242231/bild-des-schwarzen-lochs-im-zentrum-der-milchstrasse-soll-fehlerhaft-sein29.10.2024
#Astronomie #Bildanalyse #EHT #EHTC #Japan #M87 #NAOJ #SagittariusA* #SchwarzesLoch #SgrA* #SMHB #VLBI
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#DerStandard:
"
Bild des Schwarzen Lochs im Zentrum der Milchstraße soll fehlerhaft seinEin japanisches Forschungsteam äußert Zweifel an der berühmten Aufnahme. Der dunkle Fleck soll ein Artefakt sein. Fachleute verteidigen das Bild
"
https://www.derstandard.at/story/3000000242231/bild-des-schwarzen-lochs-im-zentrum-der-milchstrasse-soll-fehlerhaft-sein29.10.2024
#Astronomie #Bildanalyse #EHT #EHTC #Japan #M87 #NAOJ #SagittariusA* #SchwarzesLoch #SgrA* #SMHB #VLBI
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Interesting, the new Miyoshi paper has some pretty strong words about the EHT data "suggesting that the EHT 2017 u-v coverage is insufficient for reliable imaging" or "possible that the data are corrupted to the degree that the shape [...] cannot be determined from the residual analysis of the closure quantity". They do not see a ring but a strong peak, possibly offset from the black hole location.
#BlackHole #EHT #SgrA*
https://astrodon.social/@cosmos4u@scicomm.xyz/113365898599370335 -
This 360° visualization based on data from Chandra and other telescopes shows ~25 Wolf-Rayet stars around the Milky Way's supermassive black hole Sgr A*.
The movie shows 2 simulations, each of which start around 350 years in the past and span 500 years. The 1st one shows Sgr A* in a calm state, the 2nd has a more violent Sgr A* that is expelling material, thereby preventing accretion of clumped material (yellow blobs) prominent in the 1st section.
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Dozens of massive Wolf-Rayet stars are known to orbit within 1.5 ly of the central super massive black hole Sgr A* in our own galaxy.
The fierce stellar winds of the WR stars collide with each other creating shock waves and clumps of gas and dust, which heat up to millions of degrees and emit X-rays. Some of these clumps spiral into the black hole. Some of the material gets ejected into interstellar space.
https://chandra.harvard.edu/photo/2018/gcenter360/
#WolfRayet #SgrA*
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