The Cold Gas Content of Elliptical Galaxies

1996 ◽  
pp. 393-393
Author(s):  
W. K. Huchtmeier ◽  
L. J. Sage ◽  
C. Henkel
Keyword(s):  
Elliptical Galaxies ◽  
Gas Content ◽  
Cold Gas

scholarly journals The Cold Gas Content of Elliptical Galaxies

1996 ◽  
Vol 171 ◽  
pp. 393-393
Author(s):  
W.K. Huchtmeier ◽  
L.J. Sage ◽  
C. Henkel
Keyword(s):  
Molecular Hydrogen ◽  
Neutral Hydrogen ◽  
Elliptical Galaxies ◽  
Radial Velocities ◽  
The Other ◽  
Gas Content ◽  
Global Properties ◽  
Two Samples ◽  
Nearby Galaxies ◽  
Cold Gas

The 100m radiotelescope at Effelsberg has been used to observe two samples of elliptical galaxies in the 21cm line of neutral hydrogen. One sample is defined by the elliptical galaxies in the Revised-Shapely-Ames catalog (RSA) (Huchtmeier 1994, Astron.Astrophys 286, p.389); the other sample is defined by all elliptical galaxies with IRAS 100 μ fluxes ≥ 500mJy north of declination –310 (Huchtmeier, Sage, Henkel 1995 Astron.Astrophys. in press). Among the detected galaxies there are 23 (RSA) and 24 (IRAS) isolated elliptical galaxies free of confusion by nearby galaxies with similar radial velocities. Global properties of these two samples of elliptical galaxies are discussed: their HI-properties, optical and IR luminosities, their optical colors, their masses of dust and of molecular hydrogen.

scholarly journals xGASS: cold gas content and quenching in galaxies below the star-forming main sequence

2020 ◽  
Vol 493 (2) ◽  
pp. 1982-1995 ◽  
Author(s):  
Steven Janowiecki ◽  
Barbara Catinella ◽  
Luca Cortese ◽  
Amelie Saintonge ◽  
Jing Wang
Keyword(s):  
Star Formation ◽  
Main Sequence ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Gas Content ◽  
Gas Reservoirs ◽  
Star Forming ◽  
Correct Model ◽  
Gas Measurements ◽  
Cold Gas

ABSTRACT We use H i and H2 global gas measurements of galaxies from xGASS and xCOLD GASS to investigate quenching paths of galaxies below the Star forming main sequence (SFMS). We show that the population of galaxies below the SFMS is not a 1:1 match with the population of galaxies below the H i and H2 gas fraction scaling relations. Some galaxies in the transition zone (TZ) 1σ below the SFMS can be as H i-rich as those in the SFMS, and have on average longer gas depletion time-scales. We find evidence for environmental quenching of satellites, but central galaxies in the TZ defy simple quenching pathways. Some of these so-called ‘quenched’ galaxies may still have significant gas reservoirs and be unlikely to deplete them any time soon. As such, a correct model of galaxy quenching cannot be inferred with star formation rate (or other optical observables) alone, but must include observations of the cold gas. We also find that internal structure (particularly, the spatial distribution of old and young stellar populations) plays a significant role in regulating the star formation of gas-rich isolated TZ galaxies, suggesting the importance of bulges in their evolution.

scholarly journals Cold gas in group-dominant elliptical galaxies

2015 ◽  
Vol 573 ◽  
pp. A111 ◽  
Author(s):  
E. O’Sullivan ◽  
F. Combes ◽  
S. Hamer ◽  
P. Salomé ◽  
A. Babul ◽  
...  
Keyword(s):  
Elliptical Galaxies ◽  
Cold Gas

scholarly journals Cold gas in elliptical galaxies

2001 ◽  
Vol 326 (4) ◽  
pp. 1431-1440 ◽  
Author(s):  
A. Georgakakis ◽  
A.M. Hopkins ◽  
A. Caulton ◽  
T. Wiklind ◽  
A.I. Terlevich ◽  
...  
Keyword(s):  
Elliptical Galaxies ◽  
Cold Gas

scholarly journals Gas accretion regulates the scatter of the mass–metallicity relation

2020 ◽  
Vol 498 (3) ◽  
pp. 3215-3227
Author(s):  
Gabriella De Lucia ◽  
Lizhi Xie ◽  
Fabio Fontanot ◽  
Michaela Hirschmann
Keyword(s):  
Star Formation ◽  
Galaxy Evolution ◽  
Formation Rate ◽  
Gas Content ◽  
Stellar Feedback ◽  
Accretion Rates ◽  
The Galaxy ◽  
Gas Cooling ◽  
Gas Accretion ◽  
Cold Gas

ABSTRACT In this paper, we take advantage of the GAlaxy Evolution and Assembly (GAEA) semi-analytic model to analyse the origin of secondary dependencies in the local galaxy mass–gas metallicity relation. Our model reproduces quite well the trends observed in the local Universe as a function of galaxy star formation rate and different gas-mass phases. We show that the cold gas content (whose largest fraction is represented by the atomic gas phase) can be considered as the third parameter governing the scatter of the predicted mass–metallicity relation, in agreement with the most recent observational measurements. The trends can be explained with fluctuations of the gas accretion rates: a decrease of the gas supply leads to an increase of the gas metallicity due to star formation, while an increase of the available cold gas leads to a metallicity depletion. We demonstrate that the former process is responsible for offsets above the mass–metallicity relation, while the latter is responsible for deviations below the mass–metallicity relation. In low- and intermediate-mass galaxies, these negative offsets are primarily determined by late gas cooling dominated by material that has been previously ejected due to stellar feedback.

scholarly journals 5.15. Star formation and molecular gas in NGC 404

1998 ◽  
Vol 184 ◽  
pp. 241-242 ◽  
Author(s):  
J. Cepa ◽  
B. Vila ◽  
N. Nakai ◽  
K. Kohno ◽  
R. Kawabe
Keyword(s):  
Star Formation ◽  
Elliptical Galaxies ◽  
Molecular Gas ◽  
Early Type ◽  
Ionized Gas ◽  
General Properties ◽  
Cool Gas ◽  
Cold Gas

The last decade has brought about a completely different picture of elliptical galaxies. The once considered completely inert systems have revealed the presence of fair amount of dust, cool and cold gas, and undergoing star formation. The current statistics is that 80% of elliptical galaxies have detectable cool gas components, and as many as 60% have ionized gas (Knapp et al. 1989, Goudfrooij et al. 1994). Several single-dish CO surveys have been reported in the literature, allowing the deduction of several general properties of the molecular gas in early-type galaxies (Sage & Wrobel 1989, Lees et al. 1991, Wiklind et al. 1995).

scholarly journals Molecular gas content of H i monsters and implications to cold gas content evolution in galaxies

2014 ◽  
Vol 441 (2) ◽  
pp. 1363-1379 ◽  
Author(s):  
Cheoljong Lee ◽  
Aeree Chung ◽  
Min S. Yun ◽  
Ryan Cybulski ◽  
G. Narayanan ◽  
...  
Keyword(s):  
Gas Content ◽  
Molecular Gas ◽  
Cold Gas

scholarly journals Erratum - a ROSAT PSPC Investigation of NGC1399 - Cold Gas and Cooling Flows in Elliptical Galaxies

1995 ◽  
Vol 274 (3) ◽  
pp. 976-976 ◽  
Author(s):  
F. V. N. Rangarajan ◽  
A. C. Fabian ◽  
W. R. Forman ◽  
C. Jones
Keyword(s):  
Elliptical Galaxies ◽  
Cooling Flows ◽  
Cold Gas

scholarly journals Hot Gas in Galactic Haloes and Winds

1980 ◽  
Vol 5 ◽  
pp. 411-417
Author(s):  
Lennox L. Cowie
Keyword(s):  
Spiral Galaxies ◽  
Elliptical Galaxies ◽  
Solar Neighborhood ◽  
Gas Flows ◽  
Hot Gas ◽  
Upper Limits ◽  
Alternative Suggestion ◽  
Emission Studies ◽  
Galactic Haloes ◽  
Cold Gas

At this time we have no direct evidence for the presence of hot gaseous haloes or winds associated with galaxies. We do know that hot gas exists in conjunction with cold gas in the disks of the spirals and that this gas is hot enough to form a substantial corona. There are also a number of indirect observations which would suggest that hot gas flows and possibly bound hot gas occur in both elliptical and spiral galaxies.In the case of elliptical galaxies the expected accumulated mass loss from the stars is not observed. Typical upper limits to the mass of cold gas at less than 1040K are around 108 M based on 21cm emission studies of the galaxies (reviewed by Van Woerden 1977). We would expect almost two orders of magnitude more material than this to have been ejected from the stars. Burke (1968), Johnson and Axford (1971) and Mathews and Baker (1971) postulated the existance of a hot galactic wind with temperatures of a few times 1060K powered by supernovae, in order to clear material from these galaxies. The evidence for hot galactic haloes around spiral galaxies is even more indirect and is based on the existance of high latitude cold clouds in our own galaxy. The velocities and number of these clouds imply that they almost certainly lie high above the galactic cold gas which extends only to a height of 130 Fc in the solar neighborhood. Spitzer therefore suggested in 1956 that an intercloud gas would have to exist to keep these clouds confined, and that to have such a large scaleheight it would have to be hot with temperatures of around 1060K. (An alternative suggestion by Pickelner (1955) was that the halo was cold but supported by turbulent velocities of around 70 km s-1.) The Spitzer Halo was assumed to be maintained by energetic particles from SN in the plane.

scholarly journals The cold gas content of bulgeless dwarf galaxies

2011 ◽  
Vol 417 (4) ◽  
pp. 2891-2898 ◽  
Author(s):  
K. Pilkington ◽  
B. K. Gibson ◽  
F. Calura ◽  
A. M. Brooks ◽  
L. Mayer ◽  
...  
Keyword(s):  
Dwarf Galaxies ◽  
Gas Content ◽  
Cold Gas
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