Ամսագրի կամ հրապարակման վերնագիր:

Բյուրականի աստղադիտարանի հաղորդումներ: Երևանի աստղադիտարանի բյուլետեն = Сообщения Бюраканской обсерватории. Бюллетень ереванской Астрономической обсерватории = Contributions from the Burakan observatory. Bulletin of the Erevan astronomical observatory

Հրապարակման ամսաթիվ:

2025

Հատոր:

72

Համար:

2

ISSN:

2579-2276

Ծածկույթ:

363-368

Ամփոփում:

Centers of galaxies hosting supermassive black holes (SMBHs) drive extreme astrophysical processes that shape galaxy evolution. The circumnuclear region of the Galactic Center (GC) provides a unique laboratory to study these effects around Sgr A⋆. Using MeerKAT 1.3 GHz continuum and ALMA H40α data, we separate thermal free–free and nonthermal synchrotron emission at 18′′ (0.7 pc) resolution. The correlation between nonthermal radio and FIR emission reveals a balance between magnetic, cosmic ray, and gas pressures, with an equipartition magnetic field averaging 445±7 μG and increasing toward Sgr A⋆. We find that the nonthermal pressure imposed by turbulent gas almost balances that of the magnetic field/cosmic rays and is about two orders of magnitude larger than the thermal pressure. Mass-to-flux ratios suggest a generally subcritical state, implying that magnetic fields play a key role in stabilizing clouds against collapse.

Ձևաչափ:

pdf

Նույնացուցիչ:

oai:arar.sci.am:426394

Գլխավոր նշում:

Communications of the Byurakan Astrophysical Observatory (ComBAO) is a peer-reviewed scientific journal, which publishes research in observational and theoretical astronomy/astrophysics and presents recent advances in these fields. It is being published by the NAS RA V. Ambartsumian Byurakan Astrophysical Observatory (BAO) in English in electronic form. The journal publishes original papers, review papers, brief reports, book reviews, special communications, observational and theoretical results in various fields of astronomy and related sciences, and some editorial notes, including anniversaries and obituaries. Under the heading “Legacy”, the renewed magazine will republish some old articles of high value in English. The heading “Guest articles” will bring to the attention of readers the articles of researchers who are not employees of BAO. ComBAO was founded in 1946 and regularly published in 1946-1990. However, the publication was interrupted because of the economic situation after the disintegration of the Soviet Union in 1991.

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