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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

456

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

951-960

Kód UT WoS článku

000368010000105

EID výsledku v databázi Scopus

2-s2.0-84959552521