Search for Faint Galaxies Towards Nearby Voids

Hopp, U.; Kuhn, Benjamin; Elsässer, H.; Birkle, K.; Thiele, U.

doi:10.1007/978-94-011-1146-1_148

Cited by 6 publications

(14 citation statements)

References 9 publications

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“…The comparison of our total magnitudes with earlier measurements, presented in Hopp et al (1995), yields following mean residuals: B T, our − B T, earlier =0.05± 0.21 mag and R T, our − R T, earlier =0.02±0.15 mag. Both measurements are based on the same observations and the similarity of results means, that the total magnitudes are not very sensitive to the photometric procedure, applied.…”

Section: The Internal Consistency Of the Surface Brightness Datasupporting

confidence: 71%

“…Table 6 adds the photometric data of 10 galaxies, which were observed only in the R band. The galaxies are arranged according to the fields and right ascensions as given in Hopp et al (1995) and data are arranged in tables as follows: Column 1: The galaxy designation according to Hopp et al (1995) or the UGC (Nilson 1973) name or the galaxy coordinates, taken from CGCG (Zwicky et al 1961-68). Columns 2, 3: The 1950 right ascension and declination, taken from Hopp et al (1995) or from UGC (Nilson 1973) or from CGCG (Zwicky et al 1961-68).…”

Section: Profile Extractionmentioning

confidence: 99%

“…The morphological types estimates of the galaxies are given in Hopp et al (1995). Here we attempt to quantify the galaxian morphology by means of analyzing their surface brightness profiles.…”

Section: Profile Fitting and Classificationmentioning

confidence: 99%

“…For a subsample of 138 galaxies redshifts were measured and converted to distances, which demonstrate that several of these galaxies are very isolated and populate the rims of the voids . The first results of the "void project" are summarized in Hopp et al (1995). It includes the coordinates of the selected galaxies, their measured redshifts and estimated morphological types as well as first measurements of the basic photometric parameters.…”

Section: Introductionmentioning

confidence: 99%

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Surface photometry of galaxies in low density regions

Vennik¹,

Hopp²,

Kovachev

et al. 1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -We perform detailed surface photometry, based on B-and/or R-band CCD images of 92 faint galaxies. They are a subsample of those galaxies which were studied by Hopp et al. (1994) in the direction of three nearby voids. We derive integral photometric parameters and radial surface brightness profiles and compare them to those of several faint galaxy samples, located in different environments, and of a bright field galaxy sample. According to the obtained photometric characteristics, our sample is a mixture of intrinsically bright and faint galaxies, about 60% of them belonging to the bright subsample (MB −19.0). These bright ones show mean characteristics of typical Freeman's disks and are mainly located in the background of the observed voids. The faint subsample (MB ≥ −19.0) has parameters typical for the low-surface-brightness (LSB) galaxies. There are a few well isolated galaxies both among the bright and faint subsamples. About 40% of studied galaxies reveal ellipticity and position angle variations along of the radius. The (B − R) colour indices of the observed galaxies span over a wide range of 0.5−1.8 mag with a median value at 1.11 mag, rather blue. About 30% of the observed galaxies reveal radial colour gradients at a 5σ significance level. These galaxies show typically red centers and are getting bluer towards the periphery. The most isolated galaxies in our sample show relatively blue colours (BT − RT 0.8). About 40% of the studied galaxies have surface brightness profiles which can be described by the model of single exponential disk. 38% of our galaxies have more complicated profiles and either can be approximated by two exponentials or show the presence of a small bulge. 20% of the observed galaxies have central light depression and outer irregularities -typical for some dwarf galaxies. These profile type frequencies are similar to those of faint field galaxy sample. The evolutionary history of both the isolated and clustered galaxies obviously results in similar photometric and structural characteristics. Thus the photometric methods alone are inadequate for selecting galaxies with different isolation properties.

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Section: The Internal Consistency Of the Surface Brightness Datasupporting

confidence: 71%

Section: Profile Extractionmentioning

confidence: 99%

Section: Profile Fitting and Classificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface photometry of galaxies in low density regions

Vennik¹,

Hopp²,

Kovachev

et al. 1996

Astron. Astrophys. Suppl. Ser.

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show abstract

“…The project belongs to a larger one that has the aim of finding faint galaxies within the voids (Hopp et al 1995;Kuhn et al 1997). In summary, we have undertaken a program to search for dwarf galaxies in voids.…”

Section: (Paper Ii)mentioning

confidence: 99%

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

Popescu

Hopp

Hagen

et al. 1998

Astron. Astrophys. Suppl. Ser.

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Abstract. We present a second list of emission-line galaxies (ELGs) discovered during our survey of nearby voids. The project aims to answer the question of whether the giant galaxies are fair tracers of the large scale structure and whether the voids are really empty. This paper is the third of a series of papers dedicated to this project. The survey was based on a sample selected from the HQS (Hamburg Quasar Survey) -IIIa-J digitised objective prism plates and the main selection criteria was the presence of emission-lines, mainly of the [OIII] λ5007 line.Positions, heliocentric redshifts, detected emissionlines and finding charts are provided for ELGs in a region North of the Coma Supercluster, 30.5• < δ < 45.5• , centred around 13.5h . Most of the galaxies presented here are from the extreme faint candidates, close to the detection limit of the photographic plates. Brighter galaxies detected among the candidates of the same region were discussed in Popescu et al. (1996) (Paper I). A few redshifts of other emission line galaxies observed since the publication of Paper I are also included; in total, we present new redshifts for a total of 47 galaxies.

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The ROSAT Brightest Cluster Sample — IV. The extended sample

Ebeling¹,

Edge²,

Allen³

et al. 2000

Monthly Notices of the Royal Astronomical Society

352

412

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We present a low‐flux extension of the X‐ray‐selected ROSAT Brightest Cluster Sample (BCS) published in Paper I of this series. Like the original BCS and employing an identical selection procedure, the BCS extension is compiled from ROSAT All‐Sky Survey (RASS) data in the northern hemisphere (δ≥0°) and at high Galactic latitudes (|b|≥20°). It comprises 99 X‐ray‐selected clusters of galaxies with measured redshifts z≤0.3 (as well as eight more at z>0.3) and total fluxes between 2.8×10−12 and 4.4×10−12 erg cm−2 s−1 in the 0.1–2.4 keV band (the latter value being the flux limit of the original BCS). The extension can be combined with the main sample published in 1998 to form the homogeneously selected extended BCS (eBCS), the largest and statistically best understood cluster sample to emerge from the RASS to date. The nominal completeness of the combined sample (defined with respect to a power‐law fit to the bright end of the BCS log N–log S distribution) is relatively low at 75 per cent (compared with 90 per cent for the high‐flux sample of Paper I). However, just as for the original BCS, this incompleteness can be accurately quantified, and thus statistically corrected for, as a function of X‐ray luminosity and redshift. In addition to its importance for improved statistical studies of the properties of clusters in the local Universe, the low‐flux extension of the BCS is also intended to serve as a finding list for X‐ray‐bright clusters in the northern hemisphere which we hope will prove useful in the preparation of cluster observations with the next generation of X‐ray telescopes such as Chandra and XMM‐Newton. An electronic version of the eBCS can be obtained from the following URL: http://www.ifa.hawaii.edu/~ebeling/clusters/BCS.html.

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Search for Faint Galaxies Towards Nearby Voids

Cited by 6 publications

References 9 publications

Surface photometry of galaxies in low density regions

Surface photometry of galaxies in low density regions

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

The ROSAT Brightest Cluster Sample — IV. The extended sample

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