Extragalactic maser surveys

Henkel, C.; Greene, Jenny E.; Kamali, F.

doi:10.1017/s1743921318000753

Cited by 2 publications

(1 citation statement)

References 80 publications

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“…Also in several cases the disk mass was found to be comparable to the SMBH mass, a major complication for SMBH mass measurements. However, progress on this subject has been accelerating in recent years (Kuo et al, 2017a,b;Gao et al, 2017;Henkel et al, 2018).…”

Section: How Solid Is the Evidence Of Smbhs In Galactic Nuclei?mentioning

confidence: 99%

Co-evolution of galaxies and Active Galactic Nuclei

De Zotti

2018

Preprint

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Supermassive black holes (SMBHs) have been found to be ubiquitous in the nuclei of early-type galaxies and of bulges of spirals. There are evidences of a tight correlation between the SMBH masses, the velocity dispersions of stars in the spheroidal components galaxies and other galaxy properties. Also the evolution of the luminosity density due to nuclear activity is similar to that due to star formation. All that suggests an evolutionary connection between Active Galactic Nuclei (AGNs) and their host galaxies. After a review of these evidences this lecture discusses how AGNs can affect the host galaxies. Other feedback processes advocated to account for the differences between the halo and the stellar mass functions are also briefly introduced. pta.edu.pl/proc/2018feb23/123

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Section: How Solid Is the Evidence Of Smbhs In Galactic Nuclei?mentioning

confidence: 99%

Co-evolution of galaxies and Active Galactic Nuclei

De Zotti

2018

Preprint

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Sardinia Radio Telescope observations of Local Group dwarf galaxies – I. The cases of NGC 6822, IC 1613, and WLM

Tarchi

Castangia

Surcis

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Almost all dwarf galaxies in the Local Group (LG) that are not satellites of the Milky Way or M 31 belong to either one of two highly symmetric planes. It is still a matter of debate whether these planar structures are dynamically stable or whether they only represent a transient alignment. Proper motions, if they could be measured, could help to discriminate between these scenarios. Such motions could be determined with multi-epoch very long baseline interferometry (VLBI) of sources that show emission from water and methanol at frequencies of 22 and 6.7 GHz, respectively. We report searches for such masers. We have mapped three LG galaxies, NGC 6822, IC 1613, and WLM, in the bands covering the water vapour and methanol lines. These systems are members of the two above-mentioned planes of galaxies. We have produced deep radio continuum (RC) maps and spectral line cubes. The former have been used to identify star-forming regions and to derive global galactic star formation rates (SFRs). These SFRs turn out to be lower than those determined at other wavelengths in two of our sources. This indicates that dwarf galaxies may follow predictions on the RC–SFR relation only in individual regions of enhanced RC emission, but not when considering the entire optical body of the sources. No methanol or water maser emission has been confidently detected, down to line luminosity limits of ∼4 × 10−3 and 10 × 10−3 L⊙, respectively. This finding is consistent with the small sizes, low SFRs, and metallicities of these galaxies.

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Extragalactic maser surveys

Cited by 2 publications

References 80 publications

Co-evolution of galaxies and Active Galactic Nuclei

Co-evolution of galaxies and Active Galactic Nuclei

Sardinia Radio Telescope observations of Local Group dwarf galaxies – I. The cases of NGC 6822, IC 1613, and WLM

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