James #Webb Space Telescope #JWST

Identifying, counting, and mapping YSOs in #Sgr B2: our Galaxys most massive molecular cloud
TARG: #SGRB2
Observed: 2025-09-02
PI: Ginsburg, Adam G.
MIRI 2550 1280 770

yuval-harpaz.github.io/astro/jwst_l...

NASA/ESA/CSA/STScI/j. Roger

flic.kr/p/2syUA6q

James #Webb Space Telescope #JWST

Identifying, counting, and mapping YSOs in Sgr B2: our Galaxy most massive molecular cloud

TARG: #SGRB2
2024-09-07
PI: Ginsburg, Adam G
NIRCAM 444-466 405-444 480 410 360 300 212 210 187 182 150w

mast.stsci.edu/portal/Mashu...

NASA/ESA/CSA/STScI/j. Roger

This observation was part of the 5365 proposal led by Dr. Adam G Ginsburg. 🔭

Even though there were three filters, I didn't go for a RGB combinaison, but a Cyan/Orange + Red one, which I think fits this observation quite well!

Credits & HD: flic.kr/p/2syXgja

⏰⏰New #PizzaSeminar on Friday at 12 pm!

Don't miss the talk by Álvaro Sánchez-Monge @AlvaroAstro from @UniCologne:

"The physical and chemical structure of SgrB2. Studying the most massive cloud in the Galaxy"

💻

bit.ly/3rF5nGk

Indications of electron-to-proton mass ratio variations in the Galaxy. III. 0.6mm methanol lines toward SgrB2(N) and Orion-KL
https://arxiv.org/pdf/2603.05990
J. S. Vorotyntseva, S. A. Levshakov.

J. S. Vorotyntseva, S. A. Levshakov: Indications of electron-to-proton mass ratio variations in the Galaxy. III. 0.6mm methanol lines toward SgrB2(N) and Orion-KL https://arxiv.org/abs/2603.05990 https://arxiv.org/pdf/2603.05990 https://arxiv.org/html/2603.05990

range 542-543 GHz (Herschel space telescope archival data) for SgrB2(N): (Delta mu)/mu = (-4.2 +/- 0.7)*10^(-7). [4/4 of https://arxiv.org/abs/2506.04258v1]

is equal to (-3.0 +/- 0.6)*10^(-7) (1 sigma C.L.) in the whole cloud SgrB2. The revealed 5 sigma signal in mu-variations agrees within the margin of error with the recently obtained result based on methanol emission lines from the higher frequency [3/4 of https://arxiv.org/abs/2506.04258v1]

SgrB2(N) is not explained by known systematic effects and requires further investigation. [5/5 of https://arxiv.org/abs/2503.17665v1]

changes in mu (Ori-lab): Delta mu/mu = (-0.5 +/- 0. 6)*10^(-7), while a comparison between SgrB2(N) and laboratory lines indicates a lower value of mu near the Galactic center (Sgr-lab): Delta mu/mu = (-4.2 +/- 0.7)*10^(-7). The reduced value of mu in [4/5 of https://arxiv.org/abs/2503.17665v1]

observatory Herschel toward SgrB2(N) and Orion-KL corresponds to (Sgr-Ori): Delta mu/mu = (-3.7 +/- 0.5)*10^(-7) (1 sigma C.L.). At the same time, comparison of the same methanol lines in Orion-KL with laboratory frequencies shows no significant [3/5 of https://arxiv.org/abs/2503.17665v1]

arXiv:2503.17665v1 Announce Type: new
Abstract: Near (~100 pc) and far (~8.7 kpc) relative to the Galactic center, the molecular clouds SgrB2(N) and Orion-KL exhibit different values of the fundamental physical constant mu=m_e/m_p - the [1/5 of https://arxiv.org/abs/2503.17665v1]

Indications of electron-to-proton mass ratio variations in the Galaxy. III. 0.6mm methanol lines toward SgrB2(N) and Orion-KL. J. S. Vorotyntseva et. al. https://arxiv.org/abs/2603.05990

🤖 processing for highlight #JWST 🔭 MIRI data, target name: SGRB2_MIRI.
PI: Ginsburg, Adam G, program 5365. CRVAL: 266.834804, -28.384607
Credits: NASA, ESA, CSA, STScI.
See more highlights at jwst_highlights_gray.html.