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 ամսաթիւ:

2025

Հատոր:

72

Համար:

2

ISSN:

2579-2276

Ծածկոյթ:

427-436

Ամփոփում:

Magnetic fields are known to influence the thermal and structural properties of galactic gas, yet their impact on the rotational dynamics of galaxies remains largely underexplored. In this study, we examine how the magnetic arms of the spiral galaxy NGC 6946 affect its HI-traced circular gas rotation, incorporating two dark matter density models: the pseudo-isothermal (ISO) and the Navarro-Frenk- White (NFW) profile. To assess the magnetic contribution, we employ a three-dimensional representation of the galaxy’s magnetic field and perform a χ2 minimization to match the modeled rotation curve with observational data. Our results show that including magnetic effects yields a better fit to the HI rotation curve, particularly in the outer disk where magnetic forces become more significant. The typical amplitude of the regular magnetic field contribution to the rotation curve increases with galactocentric radius, reaching approximately 14 kms−1 in the outer gaseous disk of the galaxy NGC 6946, which corresponds to about five percent of the observed rotational velocity. These findings suggest that largescale magnetic fields play a non-negligible role in the global dynamics of spiral galaxies, especially at large radii.

Ձեւաչափ:

pdf

Նոյնացուցիչ:

oai:arar.sci.am:426405

Գլխաւոր նշումը:

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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