Neutral Hydrogen in Virgo Cluster Galaxies

Davies, R. D.; Lewis, B. M.

doi:10.1093/mnras/165.2.231

Cited by 110 publications

(85 citation statements)

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“…Galaxies in an underdense region tend to have richer cold gas reservoirs than those in an overdense region (Davies & Lewis 1973;Solanes et al 2001;di Serego Alighieri et al 2007;Grossi et al 2009;Cortese et al 2011;Catinella et al 2013). In such circumstances, the central engine of AGNhost galaxies in an underdense region may be fueled more sufficiently and is more likely in quasar mode, resulting in a larger fraction of galaxies being observed as quasars.…”

Section: Discussionmentioning

confidence: 99%

Quasars as a Tracer of Large-Scale Structures in the Distant Universe

Song

Park

Lietzen

et al. 2016

ApJ

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We study the dependence of the number density and properties of quasars on the background galaxy density using the currently largest spectroscopic data sets of quasars and galaxies. We construct a galaxy number density field smoothed over the variable smoothing scale of between approximately 10 and 20 h −1 Mpc over the redshift range 0.46<z<0.59 using the Sloan Digital Sky Survey (SDSS) Data Release 12 (DR12) Constant MASS galaxies. The quasar sample is prepared from the SDSS-I/II DR7. We examine the correlation of incidence of quasars with the large-scale background density and the dependence of quasar properties such as bolometric luminosity, black hole mass, and Eddington ratio on the large-scale density. We find a monotonic correlation between the quasar number density and large-scale galaxy number density, which is fitted well with a power-law relation, r µ n Q G 0.618 . We detect weak dependences of quasar properties on the large-scale density such as a positive correlation between black hole mass and density, and a negative correlation between luminosity and density. We discuss the possibility of using quasars as a tracer of large-scale structures at high redshifts, which may be useful for studies of the growth of structures in the high-redshift universe.

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Section: Discussionmentioning

confidence: 99%

Quasars as a Tracer of Large-Scale Structures in the Distant Universe

Song

Park

Lietzen

et al. 2016

ApJ

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“…After correcting for our assumed distance of 17 Mpc, Davies & Lewis (1973) . Evolution of the surface density profile of the gas component in our M2 simulation.…”

Section: Gas In Ngc 4254mentioning

confidence: 99%

Kinematic clues to the origins of starless HI clouds : dark galaxies or tidal debris?

Taylor

Davies

Jáchym

et al. 2017

Mon. Not. R. Astron. Soc.

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Isolated Hi clouds with no optical counterparts are often taken as evidence for galaxygalaxy interactions, though an alternative hypothesis is that these are primordial 'dark galaxies' which have not formed stars. Similarly, certain kinematic features in Hi streams are also controversial, sometimes taken as evidence of dark galaxies but also perhaps explicable as the result of harassment. We numerically model the passage of a galaxy through the gravitational field of cluster. The galaxy consists of SPH particles for the gas and n-bodies for the stars and dark matter, while the cluster includes the gravitational effects of substructure using 400 subhalos (the effects of the intracluster medium are ignored). We find that harassment can indeed produce long Hi streams and these streams can include kinematic features resembling dark galaxy candidates such as VIRGOHI21. We also show that apparent clouds with diameter <20 kpc and velocity widths <50 km s −1 are almost invariably produced in these simulations, making tidal debris a highly probable explanation. In contrast, we show that the frequency of isolated clouds of the same size but velocity width >100 km s −1 is negligible -making this a very unlikely explanation for the observed clouds in the Virgo cluster with these properties.

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“…In early days, Davies & Lewis (1973) have shown that Virgo galaxies are generally more deficient in HI compared to field galaxies based on their single-dish E-mail : bhlee301@gmail.com † E-mail : achung@yonsei.ac.kr (corresponding) observations. In addition, Giovanelli & Haynes (1985) have found that the HI content is well correlated with the location of galaxies in a sense that HI is more deficient at smaller distances from the cluster centre.…”

Section: Introductionmentioning

confidence: 99%

The effect of ram pressure on the molecular gas of galaxies: three case studies in the Virgo cluster

Lee¹,

Chung²,

Tonnesen³

et al. 2016

Mon. Not. R. Astron. Soc.

131

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We present 12CO (2-1) data of three Virgo spirals -NGC 4330, NGC 4402 and NGC 4522 obtained using the Submillimeter Array. These three galaxies show clear evidence of ram pressure stripping due to the cluster medium as found in previous HI imaging studies. Using high-resolution CO data, we investigate how the properties of the inner molecular gas disc change while a galaxy is undergoing HI stripping in the cluster. At given sensitivity limits, we do not find any clear signs of molecular gas stripping. However, both its morphology and kinematics appear to be quite disturbed as those of HI. Morphological peculiarities present in the molecular and atomic gas are closely related with each other, suggesting that molecular gas can be also affected by strong ICM pressure even if it is not stripped. CO is found to be modestly enhanced along the upstream sides in these galaxies, which may change the local star formation activity in the disc. Indeed, the distribution of Hα emission, a tracer of recent star formation, well coincides with that of the molecular gas, revealing enhancements near the local CO peak or along the CO compression. FUV and Hα share some properties in common, but FUV is always more extended than CO/Hα in the three galaxies, implying that the starforming disc is rapidly shrinking as the molecular gas properties have changed. We discuss how ICM pressure affects dense molecular gas and hence star formation properties while diffuse atomic gas is being removed from a galaxy.

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Neutral Hydrogen in Virgo Cluster Galaxies

Cited by 110 publications

References 0 publications

Quasars as a Tracer of Large-Scale Structures in the Distant Universe

Quasars as a Tracer of Large-Scale Structures in the Distant Universe

Kinematic clues to the origins of starless HI clouds : dark galaxies or tidal debris?

The effect of ram pressure on the molecular gas of galaxies: three case studies in the Virgo cluster

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