Deep optical imaging of the dark galaxy candidate AGESVC1282

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00535352" target="_blank" >RIV/67985815:_____/20:00535352 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0313396" target="_blank" >http://hdl.handle.net/11104/0313396</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202039174" target="_blank" >10.1051/0004-6361/202039174</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Deep optical imaging of the dark galaxy candidate AGESVC1282

Popis výsledku v původním jazyce

The blind HI survey Arecibo Galaxy Environment Survey (AGES) detected several unresolved sources in the Virgo cluster, which do not have optical counterparts in the Sloan Digital Sky Survey. The origin of these dark clouds is unknown. They might be crucial objects since they could be the so-called dark galaxies, that is, the dark matter halos without stellar content that are expected from cosmological simulations. In order to reveal the nature of the dark clouds, we took a deep optical image of one them, AGESVC1 282, with the newly-commissioned 1.4 m Milankovi Telescope. After observing it for 10.4 h in the L-filter, the image reached a surface-brightness limit of about 29.1 mag arcsec(-2) in V. No optical counterpart was detected. We placed an upper limit on the V-band luminosity of the object of 1.1x10(7) L-circle dot, giving a stellar mass below 1.4x10(7) M-circle dot and a HI-to-stellar mass ratio above 3.1. By inspecting archival HI observations of the surrounding region, we found that none of the standard explanations for optically dark HI clouds fits the available constraints on this object.

Název v anglickém jazyce

Deep optical imaging of the dark galaxy candidate AGESVC1282

Popis výsledku anglicky

The blind HI survey Arecibo Galaxy Environment Survey (AGES) detected several unresolved sources in the Virgo cluster, which do not have optical counterparts in the Sloan Digital Sky Survey. The origin of these dark clouds is unknown. They might be crucial objects since they could be the so-called dark galaxies, that is, the dark matter halos without stellar content that are expected from cosmological simulations. In order to reveal the nature of the dark clouds, we took a deep optical image of one them, AGESVC1 282, with the newly-commissioned 1.4 m Milankovi Telescope. After observing it for 10.4 h in the L-filter, the image reached a surface-brightness limit of about 29.1 mag arcsec(-2) in V. No optical counterpart was detected. We placed an upper limit on the V-band luminosity of the object of 1.1x10(7) L-circle dot, giving a stellar mass below 1.4x10(7) M-circle dot and a HI-to-stellar mass ratio above 3.1. By inspecting archival HI observations of the surrounding region, we found that none of the standard explanations for optically dark HI clouds fits the available constraints on this object.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

642

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

5

Strana od-do

L10

Kód UT WoS článku

000581919400001

EID výsledku v databázi Scopus

2-s2.0-85093984990