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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...

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...

A list of new nearby dwarf galaxy candidates

To increase completeness of the distance limited sample of nearby galaxies from the the Kraan-Korteweg & Tammann (1979) catalogue we undertook a search for small companions of larger known galaxies which have corrected radial velocities within 500 km/s. Based primarely on the POSS-II and ESO/SERC films we found 260 nearby dwarf galaxy candidates with angular diameters  arcmin...

A list of new nearby dwarf galaxy candidates

To increase completeness of the distance limited sample of nearby galaxies from the the Kraan-Korteweg & Tammann (1979) catalogue we undertook a search for small companions of larger known galaxies which have corrected radial velocities within 500 km/s. Based primarely on the POSS-II and ESO/SERC films we found 260 nearby dwarf galaxy candidates with angular diameters  arcmin...

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...

Baryonic Tully–Fisher relation for extremely low mass Galaxies

We study Tully–Fisher (TF) relations for a sample that combines extremely faint (MB < −14) galaxies along with bright (i.e. ∼L*) galaxies. Accurate (∼10 per cent) distances, I-band photometry and B−V colours are known for the majority of the galaxies in our sample. The faint galaxies are drawn from the Faint Irregular Galaxy GMRT survey (FIGGS), and we have H i rotation...

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...

CCD photometry and distances of six resolved irregular galaxies in Canes Venatici

The results of detailed imaging of six nearby irregular galaxies with radial velocities  km/s are presented. Except for one all the galaxies have been resolved into stars for the first time. Based on photometry of the brightest blue stars we derived the following distances to the galaxies: 3.6 Mpc for NGC 4163, 3.5 Mpc for NGC 4190, 8.6 Mpc for UGC 7298, 4.8 Mpc for UGC 7577, 3.7...

CCD photometry and distances of six resolved irregular galaxies in Canes Venatici

The results of detailed imaging of six nearby irregular galaxies with radial velocities  km/s are presented. Except for one all the galaxies have been resolved into stars for the first time. Based on photometry of the brightest blue stars we derived the following distances to the galaxies: 3.6 Mpc for NGC 4163, 3.5 Mpc for NGC 4190, 8.6 Mpc for UGC 7298, 4.8 Mpc for UGC 7577, 3.7...

CCD photometry and distances of six resolved irregular galaxies in Canes Venatici

The results of detailed imaging of six nearby irregular galaxies with radial velocities  km/s are presented. Except for one all the galaxies have been resolved into stars for the first time. Based on photometry of the brightest blue stars we derived the following distances to the galaxies: 3.6 Mpc for NGC 4163, 3.5 Mpc for NGC 4190, 8.6 Mpc for UGC 7298, 4.8 Mpc for UGC 7577, 3.7...

Cam A: a new dwarf low-surface-brightness galaxy on the Local Group outskirts?

We present a deep I-band image of the nearby dwarf irregular galaxy Cam A obtained with the Nordic Optical Telescope with 0.6-arcsec seeing (FWHM). The distance to Cam A, DMW=1.9 Mpc, is estimated from the tip of the red giant branch seen at I=22.8±0.2 mag. The youngest stellar population of the galaxy seems to be of age about 100 Myr. Relying on its barycentric distance, DLG=1.6...

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...

Cosmic Flows: Green Bank Telescope and Parkes H i observations

The neutral hydrogen properties of 1822 galaxies are being studied with the Green Bank 100-m and the Parkes 64-m telescopes as part of the ‘Cosmic Flows’ programme. Observed parameters include systemic velocities, profile linewidths and integrated fluxes. The linewidth information can be combined with the optical and infrared photometry to obtain distances. The 1822 H i...

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...