Search for emission-line galaxies towards nearby voids.
 List 2

Popescu, Cristina; Hopp, U.; Hagen, H. J.; Elsässer, H.

doi:10.1051/aas:1998307

Cited by 11 publications

(21 citation statements)

References 10 publications

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“…This has made the study of the relation between void galaxies and their surroundings an important aspect of the recent interest in environmental influences on galaxy formation. 102,63,84,56,38,39,49,50,87,88,105,75,76,14,113,100 Amongst the issues relevant for our understanding of galaxy and structure formation, void galaxies have posed several interesting riddles and questions. Arguably the most prominent issue is that of the near absence of low-luminosity galaxies in voids, while ΛCDM cosmology expects voids to be teeming with dwarfs and low surface brightness galaxies.…”

Section: Void Galaxiesmentioning

confidence: 99%

Cosmic Voids: Structure, Dynamics and Galaxies

Weygaert

Platen

2011

Int. J. Mod. Phys. Conf. Ser.

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In this contribution we review and discuss several aspects of Cosmic Voids. Voids are a major component of the large scale distribution of matter and galaxies in the Universe. Their instrumental importance for understanding the emergence of the Cosmic Web is clear. Their relatively simple shape and structure makes them into useful tools for extracting the value of a variety cosmic parameters, possibly including even that of the influence of dark energy. Perhaps most promising and challenging is the issue of the galaxies found within their realm. Not only does the pristine environment of voids provide a promising testing ground for assessing the role of environment on the formation and evolution of galaxies, the dearth of dwarf galaxies may even represent a serious challenge to the standard view of cosmic structure formation.

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Section: Void Galaxiesmentioning

confidence: 99%

Cosmic Voids: Structure, Dynamics and Galaxies

Weygaert

Platen

2011

Int. J. Mod. Phys. Conf. Ser.

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“…One of the detailed, but somewhat limited (on galaxy number) studies of void low-mass galaxies is the Heidelberg void survey (Hopp et al 1995;Popescu et al 1996Popescu et al , 1997aPopescu et al , 1997bPopescu et al , 1998Hopp 1998). In the Hopp et al sample in the direction of voids only nine dwarf galaxies are located fully within voids (three objects), or in some intermediate regions near the void boundaries (six galaxies).…”

Section: Introductionmentioning

confidence: 99%

Studies of galaxies in voids

Pustilnik¹,

Martin²,

Huchtmeier³

et al. 2002

A&A

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Abstract. We present here results of studies of the properties of galaxies located in very low density environments. We observed 26 blue compact galaxies (BCGs) from the Second Byurakan (SBS) and Case surveys located in voids with the radial velocities V hel . 11 000 km s −1 , two BCGs in the void behind the Virgo cluster and 11 BCGs in denser environments. H i fluxes and profile widths, as well as estimates of total H i masses, are presented for the 27 detected galaxies (of which 6 are in three galaxy pairs and are not resolved by the radiotelescope beam). Preliminary comparisons of void BCGs with similar objects from intermediate density regions -in the general field and the Local Supercluster (sub-samples of BCGs in the SBS zone) and in the dense environment of the Virgo Cluster (a BCD sample) -are performed using the hydrogen-to-blue-luminosity ratio M (H i)/LB. We find that for the same blue luminosity, for MB > −18. m 0, BCGs in lower density environment have on average more H i. The slope β of the M (H i)/LB _ L β for BCGs shows a trend of steepening with decreasing bright galaxy density, being very close to zero for the densest environment considered here and reaching β = −0.4 for voids.

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“…Some of them had been found in early studies as Zwicky compact galaxies (Zwicky 1966) or Haro blue galaxies (Haro 1956). However, the great majority of BCGs were picked up by objective prism surveys such as the First and Second Byurakan (FBS, SBS) (Markarian 1967;Markarian et al 1983;Stepanian 1994), the University of Michigan (Salzer et al 1989b), the Tololo (Terlevich et al 1991), the Case (Pesch et al 1995;Salzer et al 1995;Ugryumov et al 1998), the Heidelberg void (Popescu et al 1998) and the Hamburg/SAO survey (Ugryumov et al 2001, and references therein).…”

Section: Introductionmentioning

confidence: 99%

The Hamburg/SAO Survey for low metallicity blue compact H II galaxies (HSS–LM)

Ugryumov

Engels

Pustilnik

et al. 2002

A&A

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Abstract. We present the description and the first results of a new project devoted to the search for extremely metaldeficient blue compact/H -galaxies (BCGs) and to the creation of a well selected large BCG sample with strong emission lines. Such galaxies should be suitable for reliable determination of their oxygen abundance through the measurement of the faint [O ] λ 4363 Å line. The goals of the project are two-fold: a) to discover a significant number of new extremely metalpoor galaxies (Z 1/20 Z ), and b) to study the metallicity distribution of local BCGs. Selection of candidates for follow-up slit spectroscopy is performed on the database of objective prism spectra of the Hamburg Quasar Survey. The sky region is limited by δ ≥ 0• and b II ≤ −30• . In this paper we present the results of the follow-up spectroscopy conducted with the Russian 6 m telescope. The list of observed candidates contained 52 objects, of which 46 were confirmed as strong-lined BCGs (EW([O ] λ 5007) ≥ 100 Å). The remaining five lower excitation ELGs include three BCGs, and two galaxies classified as SBN (Starburst Nucleus) and DANS (Dwarf Amorphous Nucleus Starburst). One object is identified as a quasar with a strong Lyα emission line near λ 5000 Å (z ∼ 3). We provide a list with coordinates, measured radial velocities, B-magnitudes, equivalent widths EW([O ] λ 5007) and EW(Hβ) and for the 46 strong-lined BCGs the derived oxygen abundances 12+log(O/H). The abundances range between 7.42 and 8.4 (corresponding to metallicities between 1/30 and 1/3 Z ). The sample contains four galaxies with Z 1/20 Z , of which three are new discoveries. This demonstrates the high efficiency of the new project to find extremely metal-deficient galaxies. The radial velocities of the strong-lined ELGs range between 500 and 19 000 km s −1 with a median value of ∼6400 km s −1 . The typical B-magnitudes of the galaxies presented are 17. m 0−18. m 0.

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Search for emission-line galaxies towards nearby voids. List 2

Cited by 11 publications

References 10 publications

Cosmic Voids: Structure, Dynamics and Galaxies

Cosmic Voids: Structure, Dynamics and Galaxies

Studies of galaxies in voids

The Hamburg/SAO Survey for low metallicity blue compact H II galaxies (HSS–LM)

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