Informace o publikaci

ALMA observation of the disruption of molecular gas in M87

Autoři	SIMIONESCU A. TREMBLAY G. WERNER Norbert CANNING R. E. A. ALLEN S. W. OONK J. B. R.
Rok publikování	2018
Druh	Článek v odborném periodiku
Časopis / Zdroj	Monthly Notices of the Royal Astronomical Society
Fakulta / Pracoviště MU	Přírodovědecká fakulta
Citace
www	https://academic.oup.com/mnras/article/475/3/3004/4795332 https://arxiv.org/pdf/1801.01264.pdf
Doi	http://dx.doi.org/10.1093/mnras/sty047
Klíčová slova	galaxies: active; galaxies: clusters: intracluster medium; galaxies: individual: M87; radio lines: galaxies
Popis	We present the results from Atacama Large Millimeter Array (ALMA) observations centred 40 arcsec (3 kpc in projection) south-east of the nucleus of M87. We report the detection of extended CO (2-1) line emission with a total flux of (5.5 +/- 0.6) x 10(-18) erg s(-1) cm(-2) and corresponding molecular gas mass M-H2 (4.7 +/- 0.4) x 10(5) M-circle dot, assuming a Galactic CO to H-2 conversion factor. ALMA data indicate a line-of-sight velocity of -129 +/- 3 km s(-1), in good agreement with measurements based on the [C-II] and H alpha+[N-II] lines, and a velocity dispersion of sigma = 27 +/- 3 km s(-1). The CO (2-1) emission originates only outside the radio lobe of the active galactic nucleus (AGN) seen in the 6 cm Very Large Array image, while the filament prolongs further inwards at other wavelengths. The molecular gas in M87 appears to be destroyed or excited by AGN activity, either by direct interaction with the radio plasma, or by the shock driven by the lobe into the X-ray emitting atmosphere. This is an important piece of the puzzle in understanding the impact of the central AGN on the amount of the coldest gas from which star formation can proceed.