The Arecibo Galaxy Environment Survey. XII. Optically Dark HI Clouds in the Leo I Group

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00565100" target="_blank" >RIV/67985815:_____/22:00565100 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0338032" target="_blank" >https://hdl.handle.net/11104/0338032</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-3881/ac96e8" target="_blank" >10.3847/1538-3881/ac96e8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Arecibo Galaxy Environment Survey. XII. Optically Dark HI Clouds in the Leo I Group

Popis výsledku v původním jazyce

Using data from the Arecibo Galaxy Environment Survey, we report the discovery of five H I clouds in the Leo I group without detected optical counterparts. Three of the clouds are found midway between M96 and M95, one is only 10' from the southeast side of the well-known Leo Ring, and the fifth is relatively isolated. H I masses range from 2.6 x 10(6) M-circle dot to 9.0 x 10(6) M-circle dot, and velocity widths (W50) range from 16 to 42 km s(-1). Although a tidal origin is the most obvious explanation, this formation mechanism faces several challenges. For the most isolated cloud, the difficulties are its distance from neighboring galaxies and the lack of any signs of disturbance in the H I disks of those systems. Some of the clouds also appear to follow the baryonic Tully-Fisher relation between mass and velocity width for normal, stable galaxies, which is not expected if they are tidal in origin. Three clouds are found between M96 and M95 that have no optical counterparts but have otherwise similar properties and locations to the optically detected galaxy LeG 13. While overall we favor a tidal debris scenario to explain the clouds, we cannot rule out a primordial origin. If the clouds were produced in the same event that gave rise to the Leo Ring, they may provide important constraints on any model attempting to explain that structure.

Název v anglickém jazyce

The Arecibo Galaxy Environment Survey. XII. Optically Dark HI Clouds in the Leo I Group

Popis výsledku anglicky

Using data from the Arecibo Galaxy Environment Survey, we report the discovery of five H I clouds in the Leo I group without detected optical counterparts. Three of the clouds are found midway between M96 and M95, one is only 10' from the southeast side of the well-known Leo Ring, and the fifth is relatively isolated. H I masses range from 2.6 x 10(6) M-circle dot to 9.0 x 10(6) M-circle dot, and velocity widths (W50) range from 16 to 42 km s(-1). Although a tidal origin is the most obvious explanation, this formation mechanism faces several challenges. For the most isolated cloud, the difficulties are its distance from neighboring galaxies and the lack of any signs of disturbance in the H I disks of those systems. Some of the clouds also appear to follow the baryonic Tully-Fisher relation between mass and velocity width for normal, stable galaxies, which is not expected if they are tidal in origin. Three clouds are found between M96 and M95 that have no optical counterparts but have otherwise similar properties and locations to the optically detected galaxy LeG 13. While overall we favor a tidal debris scenario to explain the clouds, we cannot rule out a primordial origin. If the clouds were produced in the same event that gave rise to the Leo Ring, they may provide important constraints on any model attempting to explain that structure.

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

2022

Kód důvěrnosti údajů

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

Název periodika

Astronomical Journal

ISSN

0004-6256

e-ISSN

1538-3881

Svazek periodika

164

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

233

Kód UT WoS článku

000877865300001

EID výsledku v databázi Scopus

2-s2.0-85141944909