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6-m telescope observations of three dwarf spheroidal galaxies with very low surface brightness

Dwarf spheroidal galaxies (dSphs) are mostly investigated in the Local Group. DSphs are difficult targets for observations because of their small size and very low surface brightness. Here we measure spectroscopic and photometric parameters of three candidates for isolated dSphs, KKH 65 = BTS23, KK 180, and KK 227, outside the Local Group. The galaxies are found to be of low...

Dark energy domination in the Virgocentric flow

Context. The standard ΛCDM cosmological model implies that all celestial bodies are embedded in a perfectly uniform dark energy background, represented by Einstein's cosmological constant, and experience its repulsive antigravity action.Aims. Can dark energy have strong dynamical effects on small cosmic scales as well as globally? Continuing our efforts to clarify this question...

Dark energy domination in the Virgocentric flow

Context. The standard ΛCDM cosmological model implies that all celestial bodies are embedded in a perfectly uniform dark energy background, represented by Einstein's cosmological constant, and experience its repulsive antigravity action.Aims. Can dark energy have strong dynamical effects on small cosmic scales as well as globally? Continuing our efforts to clarify this question...

Canes Venatici I cloud of galaxies seen in the Hα line

We present results of Hα imaging for 42 galaxies in the nearby low-density cloud Canes Venatici I, populated mainly by late-type objects. Estimates of the Hα flux and integrated star formation rate () are now available for all 78 known members of this scattered system, spanning a large range in luminosity, surface brightness, HI content and . Distributions of the CVnI galaxies...

Canes Venatici I cloud of galaxies seen in the Hα line

We present results of Hα imaging for 42 galaxies in the nearby low-density cloud Canes Venatici I, populated mainly by late-type objects. Estimates of the Hα flux and integrated star formation rate () are now available for all 78 known members of this scattered system, spanning a large range in luminosity, surface brightness, HI content and . Distributions of the CVnI galaxies...

Disturbed isolated galaxies: indicators of a dark galaxy population?

We report the results of our search for disturbed (interacting) objects among very isolated galaxies. The inspections of 1050 northern isolated galaxies from KIG and 500 nearby, very isolated galaxies situated in the Local Supercluster yielded five and four strongly disturbed galaxies, respectively. We suggest that the existence of “dark” galaxies explains the observed signs of...

Imaging and photometry of nearby dwarf galaxies - II. Southern dwarfs

We carried out CCD photometry in the Johnson-Cousins B and R bands of 23 dwarf galaxies: SDIG, ESO 410-17, KK11, ESO 245-05, KKs3, KK27, KK38, KK40, IC 4662, KK244, KK246, KK247, KK248, KK249, KK253, KK255, KK256, KK257, KK258, KK259, UGCA 438, ESO 347-17, and UGCA 442. Both isolated galaxies and members of the Sculptor group and the NGC 1313 group were observed. The galaxy...

Distances to nearby galaxies in Sculptor

We present an analysis of Hubble Space Telescope/WFPC2 images of nine nearby galaxies in Sculptor. We derive their distances from the luminosity of the tip of the red giant branch stars with a typical accuracy of ∼ 12%. Their distances are 4.21 Mpc (Sc 22), 4.92 Mpc (DDO 226), 3.94 Mpc (NGC 253), 3.40 Mpc (KDG 2), 3.34 Mpc (DDO 6), 3.42 Mpc (ESO 540-030), 4.43 Mpc (ESO 245–05), 4...

Galaxy flow in the Canes Venatici I cloud

We present an analysis of Hubble Space Telescope/WFPC2 images of eighteen galaxies in the Canes Venatici I cloud. We derive their distances from the luminosity of the tip of the red giant branch stars with a typical accuracy of ~12%. The resulting distances are 3.9 Mpc (UGC 6541), 4.9 Mpc (NGC 3738), 3.0 Mpc (NGC 3741), 4.5 Mpc (KK 109), > 6.3 Mpc (NGC 4150), 4.2 Mpc (UGC 7298...

The M 81 group of galaxies: New distances, kinematics and structure

85726 , USA 2 Send o print requests to: I. D. Karachentsev 3 Isaac Newton Institute , Chile, SAO Branch 4 Special Astrophysical Observatory, Russian Academy of Sciences , N. Arkhyz, KChR, 369167 , Russia ... from galaxies with known radial velocities and/or distance estimates, we included into the Table two dSph galaxies of extremely low surface brightness, IKN and VKN, discovered recently by I. D

A supplementary list of southern nearby dwarf galaxy candidates

To improve the census of the Local Volume galaxies, we carried out a systematic search for nearby dwarf galaxies in a declination range of based on the ESO/SERC film copies. As a result, we present a list of 81 nearby dwarf galaxy candidates of low surface brightness which have angular diameters . Half of the objects have been found for the first time. This sample may be...

A supplementary list of southern nearby dwarf galaxy candidates

To improve the census of the Local Volume galaxies, we carried out a systematic search for nearby dwarf galaxies in a declination range of based on the ESO/SERC film copies. As a result, we present a list of 81 nearby dwarf galaxy candidates of low surface brightness which have angular diameters . Half of the objects have been found for the first time. This sample may be...

Dwarf galaxy candidates found on the SERC EJ sky survey

We inspected a sky region with declination range of [ 0°, -18°] based on the SERC EJ plate copies. As a result a list of 50 nearby dwarf galaxy candidates with angular diameters is presented. Most of the galaxies have low and very low surface brightness. More than 60% of the objects are detected for the first time.

Dwarf galaxy candidates found on the SERC EJ sky survey

We inspected a sky region with declination range of [ 0°, -18°] based on the SERC EJ plate copies. As a result a list of 50 nearby dwarf galaxy candidates with angular diameters is presented. Most of the galaxies have low and very low surface brightness. More than 60% of the objects are detected for the first time.

Photometric distances to six bright resolved galaxies

We present photometry of the brightest stars in six nearby spiral and irregular galaxies with corrected radial velocities from 340 to 460 km s-1. Three of them are resolved into stars for the first time. Based on luminosity of the brightest blue stars we estimate the following distances to the galaxies: 5.0 Mpc for NGC 784, 9.2 Mpc for NGC 2683, 8.9 Mpc for NGC 2903, 4.1 Mpc for...

HI observations of nearby galaxies - I. The first list of the Karachentsev catalog

We present HI observations of the galaxies in the first list of the Karachentsev catalog of previously unknown nearby dwarf galaxies (Karachentseva & Karachentsev 1998). This survey covers all known nearby galaxy groups within the Local Volume (i.e. within 10 Mpc) and their environment, that is about 25% of the total sky. A total of 257 galaxies have been observed with a...

A list of nearby dwarf galaxies towards the Local Void in Hercules-Aquila

Based on film copies of the POSS-II we inspected a wide area of □° in the direction of the nearest cosmic void: {RA = 18h 38m, , 1500 km s-1}. As a result we present a list of 78 nearby dwarf galaxy candidates which have angular diameters and a mean surface brightness , mag/□″. Of them 22 are in the direction of the Local Void region. To measure their redshifts, a HI survey of...

A list of nearby dwarf galaxies towards the Local Void in Hercules-Aquila

Based on film copies of the POSS-II we inspected a wide area of □° in the direction of the nearest cosmic void: {RA = 18h 38m, , 1500 km s-1}. As a result we present a list of 78 nearby dwarf galaxy candidates which have angular diameters and a mean surface brightness , mag/□″. Of them 22 are in the direction of the Local Void region. To measure their redshifts, a HI survey of...

CCD imaging of twenty nearby isolated irregular galaxies

We present B, V and I CCD stellar photometry for a sample of 20 field irregular dwarf galaxies. Their corrected radial velocity is 500 km s-1. Most of them have been resolved into stars for the first time. Based on photometry of their brightest blue stars we have derived the following distances: 5.9 Mpc (UGC 685), 5.4 Mpc (UGC 1281), 7.2 Mpc (UGC 3303), 7.0 Mpc (UGC 3476), 7.3...

CCD imaging of twenty nearby isolated irregular galaxies

We present B, V and I CCD stellar photometry for a sample of 20 field irregular dwarf galaxies. Their corrected radial velocity is 500 km s-1. Most of them have been resolved into stars for the first time. Based on photometry of their brightest blue stars we have derived the following distances: 5.9 Mpc (UGC 685), 5.4 Mpc (UGC 1281), 7.2 Mpc (UGC 3303), 7.0 Mpc (UGC 3476), 7.3...