Attack of the flying snakes: formation of isolated HI clouds by fragmentation of long streams

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00471631" target="_blank" >RIV/67985815:_____/16:00471631 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1093/mnras/stw1475" target="_blank" >http://dx.doi.org/10.1093/mnras/stw1475</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stw1475" target="_blank" >10.1093/mnras/stw1475</a>

Result language

angličtina

Original language name

Attack of the flying snakes: formation of isolated HI clouds by fragmentation of long streams

Original language description

The existence of long (>100 kpc) HI streams and small (<20 kpc) free-floating HI clouds is well known. While the formation of the streams has been investigated extensively, and the isolated clouds are often purported to be interaction debris, little research has been done on the formation of optically dark HI clouds that are not part of a larger stream. One possibility is that such features result from the fragmentation of more extended streams, while another idea is that they are primordial, optically dark galaxies. We test the validity of the fragmentation scenario (via harassment) using numerical simulations. In order to compare our numerical models with observations, we present catalogues of both the known long HI streams (42 objects) and free-floating HI clouds suggested as dark galaxy candidates (51 objects). In particular, we investigate whether it is possible to form compact features with high velocity widths (>100 km s(-1)), similar to observed clouds which are otherwise intriguing dark galaxy candidates. We find that producing such features is possible but extremely unlikely, occurring no more than 0.2% of the time in our simulations. In contrast, we find that genuine dark galaxies could be extremely stable to harassment and remain detectable even after 5 Gyr in the cluster environment (with the important caveat that our simulations only explore harassment and do not yet include the intracluster medium, heating and cooling, or star formation). We also discuss the possibility that such objects could be the progenitors of recently discovered ultra diffuse galaxies.

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

—

Volume of the periodical

461

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

25

Pages from-to

3001-3026

UT code for WoS article

000383481100053

EID of the result in the Scopus database

2-s2.0-84983758404