The Arecibo Galaxy Environment Survey - X. The structure of halo gas around M33

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00471859" target="_blank" >RIV/67985815:_____/16:00471859 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1093/mnras/stv2684" target="_blank" >http://dx.doi.org/10.1093/mnras/stv2684</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stv2684" target="_blank" >10.1093/mnras/stv2684</a>

Result language

angličtina

Original language name

The Arecibo Galaxy Environment Survey - X. The structure of halo gas around M33

Original language description

As part of the HI Arecibo Galaxy Environment Survey (AGES), we have observed 5 x 4 deg of sky centred on M33, reaching a limiting column density of similar to 1.5 x 10(17) cm(-2) (line width of 10 km s(-1) and resolution 3.5 arcmin). We particularly investigate the absence of optically detected dwarf galaxies around M33, something that is contrary to galaxy formation models. We identify 22 discrete HI clouds, 11 of which are new detections. The number of objects detected and their internal velocity dispersion distribution is consistent with expectations from standard galaxy formation models. However, the issue remains open as to whether the observed velocity dispersions can be used as a measure of the HI clouds total mass, i.e. are the velocities indicative of virialized structures or have they been influenced by tidal interactions with other structures in the Local Group? We identify one particularly interesting H I cloud, AGESM33-31, that has many of the characteristics of HI distributed in the disc of a galaxy, yet there is no known optical counterpart associated with it. This object has a total H I mass of 1.22 x 10(7) M-circle dot and a diameter of 18 kpc if at the distance of M33 (D-M33 = 840 kpc). However, we also find that there are numerous other HI clouds in this region of sky that have very similar velocities and so it is plausible that all these clouds are actually associated with debris from the Magellanic stream.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

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Volume of the periodical

456

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

951-960

UT code for WoS article

000368010000105

EID of the result in the Scopus database

2-s2.0-84959552521