Cold and hot gas in the most HI deficient compact groups

Lourdes Verdes-Montenegro, Min S. Yun, Sanchayeeta Borthakur, Jesper Rasmussen, Trevor Ponman

Research output: Contribution to journalReview article

5 Citations (Scopus)

Abstract

Dense groups of galaxies should be prime sites for galaxy interactions and mergers, and their evolution has been the subject of controversy for 25 years. In order to explain the HI deficiency found in compact groups of galaxies we previously proposed an evolutionary scenario in which the amount of HI decreases with the secular evolutionary state of a group. But where does the HI go? One possibility is that the HI is heated or even shocked by the frequent galaxy interactions/collisions that occur in these dense environments. Here we present a comparison of the neutral gas distribution with the hot gas traced in X-rays. Surprisingly some of these groups do not show HI emission down to column densities as low as 1019 cm-2. In some cases ram pressure stripping by a hot intragroup medim can explain the observed HI deficiency, while in others no extended X-ray emission is found. The star formation activity is found to be similar to isolated galaxies, hence gas consumption via current star formation would neither be a general cause of the HI deficiency in compact groups.

Original languageEnglish (US)
Pages (from-to)87-89
Number of pages3
JournalNew Astronomy Reviews
Volume51
Issue number1-2
DOIs
StatePublished - Feb 1 2007
Externally publishedYes

Fingerprint

cold gas
high temperature gases
interacting galaxies
gas
galaxies
star formation
merger
collision
ram
neutral gases
stripping
x rays
cold
collisions
causes
gases

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Verdes-Montenegro, L., Yun, M. S., Borthakur, S., Rasmussen, J., & Ponman, T. (2007). Cold and hot gas in the most HI deficient compact groups. New Astronomy Reviews, 51(1-2), 87-89. https://doi.org/10.1016/j.newar.2006.10.008

Cold and hot gas in the most HI deficient compact groups. / Verdes-Montenegro, Lourdes; Yun, Min S.; Borthakur, Sanchayeeta; Rasmussen, Jesper; Ponman, Trevor.

In: New Astronomy Reviews, Vol. 51, No. 1-2, 01.02.2007, p. 87-89.

Research output: Contribution to journalReview article

Verdes-Montenegro, L, Yun, MS, Borthakur, S, Rasmussen, J & Ponman, T 2007, 'Cold and hot gas in the most HI deficient compact groups', New Astronomy Reviews, vol. 51, no. 1-2, pp. 87-89. https://doi.org/10.1016/j.newar.2006.10.008
Verdes-Montenegro, Lourdes ; Yun, Min S. ; Borthakur, Sanchayeeta ; Rasmussen, Jesper ; Ponman, Trevor. / Cold and hot gas in the most HI deficient compact groups. In: New Astronomy Reviews. 2007 ; Vol. 51, No. 1-2. pp. 87-89.
@article{a1d9dce794134731a1bfe59699f42a93,
title = "Cold and hot gas in the most HI deficient compact groups",
abstract = "Dense groups of galaxies should be prime sites for galaxy interactions and mergers, and their evolution has been the subject of controversy for 25 years. In order to explain the HI deficiency found in compact groups of galaxies we previously proposed an evolutionary scenario in which the amount of HI decreases with the secular evolutionary state of a group. But where does the HI go? One possibility is that the HI is heated or even shocked by the frequent galaxy interactions/collisions that occur in these dense environments. Here we present a comparison of the neutral gas distribution with the hot gas traced in X-rays. Surprisingly some of these groups do not show HI emission down to column densities as low as 1019 cm-2. In some cases ram pressure stripping by a hot intragroup medim can explain the observed HI deficiency, while in others no extended X-ray emission is found. The star formation activity is found to be similar to isolated galaxies, hence gas consumption via current star formation would neither be a general cause of the HI deficiency in compact groups.",
author = "Lourdes Verdes-Montenegro and Yun, {Min S.} and Sanchayeeta Borthakur and Jesper Rasmussen and Trevor Ponman",
year = "2007",
month = "2",
day = "1",
doi = "10.1016/j.newar.2006.10.008",
language = "English (US)",
volume = "51",
pages = "87--89",
journal = "New Astronomy Reviews",
issn = "1387-6473",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Cold and hot gas in the most HI deficient compact groups

AU - Verdes-Montenegro, Lourdes

AU - Yun, Min S.

AU - Borthakur, Sanchayeeta

AU - Rasmussen, Jesper

AU - Ponman, Trevor

PY - 2007/2/1

Y1 - 2007/2/1

N2 - Dense groups of galaxies should be prime sites for galaxy interactions and mergers, and their evolution has been the subject of controversy for 25 years. In order to explain the HI deficiency found in compact groups of galaxies we previously proposed an evolutionary scenario in which the amount of HI decreases with the secular evolutionary state of a group. But where does the HI go? One possibility is that the HI is heated or even shocked by the frequent galaxy interactions/collisions that occur in these dense environments. Here we present a comparison of the neutral gas distribution with the hot gas traced in X-rays. Surprisingly some of these groups do not show HI emission down to column densities as low as 1019 cm-2. In some cases ram pressure stripping by a hot intragroup medim can explain the observed HI deficiency, while in others no extended X-ray emission is found. The star formation activity is found to be similar to isolated galaxies, hence gas consumption via current star formation would neither be a general cause of the HI deficiency in compact groups.

AB - Dense groups of galaxies should be prime sites for galaxy interactions and mergers, and their evolution has been the subject of controversy for 25 years. In order to explain the HI deficiency found in compact groups of galaxies we previously proposed an evolutionary scenario in which the amount of HI decreases with the secular evolutionary state of a group. But where does the HI go? One possibility is that the HI is heated or even shocked by the frequent galaxy interactions/collisions that occur in these dense environments. Here we present a comparison of the neutral gas distribution with the hot gas traced in X-rays. Surprisingly some of these groups do not show HI emission down to column densities as low as 1019 cm-2. In some cases ram pressure stripping by a hot intragroup medim can explain the observed HI deficiency, while in others no extended X-ray emission is found. The star formation activity is found to be similar to isolated galaxies, hence gas consumption via current star formation would neither be a general cause of the HI deficiency in compact groups.

UR - http://www.scopus.com/inward/record.url?scp=33846608169&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846608169&partnerID=8YFLogxK

U2 - 10.1016/j.newar.2006.10.008

DO - 10.1016/j.newar.2006.10.008

M3 - Review article

AN - SCOPUS:33846608169

VL - 51

SP - 87

EP - 89

JO - New Astronomy Reviews

JF - New Astronomy Reviews

SN - 1387-6473

IS - 1-2

ER -