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Planes of satellite galaxies and the cosmic web

Recent observational studies have demonstrated that the majority of satellite galaxies tend to orbit their hosts on highly flattened, vast, possibly corotating planes. Two nearly parallel planes of satellites have been confirmed around the M31 galaxy and around the Centaurus A galaxy, while the Milky Way also sports a plane of satellites. It has been argued that such an alignment...

Dwarf galaxies in the NGC 1023 Group

Neil Trentham 1 R. Brent Tully 0 0 Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu HI 96822 , USA 1 Institute of Astronomy , Madingley Road, Cambridge CB3 0HA A B S T

Cosmic flows: University of Hawaii 2.2-m I-band photometry

Within the ‘Cosmic Flows’ project, I-band photometry of 524 relatively nearby galaxies has been carried out over the course of several years with the University of Hawaii 2.2-m telescope and a camera with a 7.5-arcmin field of view. The primary scientific goal was to provide global magnitudes and inclinations for galaxies for the purpose of measuring distances through the...

A survey of 286 Virgo cluster galaxies at optical griz and near-IR H band: surface brightness profiles and bulge–disc decompositions

R. Brent Tully 0 Joel Roediger 1 0 Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822 , USA 1 Department of Physics, Engineering Physics and Astronomy, Queen's

Atomic hydrogen, star formation and feedback in the lowest mass blue compact dwarf galaxies

We present the results from a search for H i emission from a sample of newly discovered dwarf galaxies in the M81 group. H i is detected in three galaxies, all of which are classified as blue compact dwarf galaxies (BCDs). The H i masses of these galaxies are ∼106 M⊙, making them some of the lowest mass BCDs known. For these three galaxies far-ultraviolet (FUV) images (from GALEX...

The near-IR luminosity function and bimodal surface brightness distributions of Virgo cluster galaxies

We have acquired deep, H-band imaging for a sample of 286 Virgo cluster galaxies with BT≤ 16 mag and extracted surface photometry from optical g, r, i, z Sloan Digital Sky Survey images of 742 Virgo Cluster Catalogue galaxies, including those with H-band images. We confirm the detection of a dip in the luminosity function indicative of a discontinuity in the cluster galaxy...

Bulge–disc decompositions and structural bimodality of Ursa Major cluster spiral galaxies

R. Brent Tully 0 0 Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI, USA 1 Department of Physics, Engineering Physics and Astronomy, Queen's University , Kingston, ON

Dwarf galaxies in the dynamically evolved NGC 1407 Group

The NGC 1407 Group stands out among nearby structures by its properties that suggest it is massive and evolved. It shares properties with entities that have been called fossil groups: the 1.4m differential between the dominant elliptical galaxy and the second brightest galaxy comes close to satisfying the definition that has been used to define the fossil class. There are few...

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...

The faint end of the galaxy luminosity function

R. Brent Tully 0 0 Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu HI 96822 , USA 1 Institute of Astronomy , Madingley Road, Cambridge CB3 0HA A B S T R A C T We

The anomalous properties of Markarian 1460

We present and discuss optical, near-;infrared and H i measurements of the galaxy Markarian 1460 at a distance of 19 Mpc in the Ursa Major Cluster. This low-;luminosity (MB=−14) galaxy is unusual because (i) it is blue (B−R=0.8) and has the spectrum of an H ii galaxy, (ii) it has a light profile that is smooth and well fitted by an r1/4 and not an exponential function at all...

The Ursa Major cluster of galaxies — III. Optical observations of dwarf galaxies and the luminosity function down to MR = –211

Results are presented of a deep optical survey of the Ursa Major cluster, a spiral-rich cluster of galaxies at a distance of 18.6 Mpc which contains about 30 per cent of the light but only 5 per cent of the mass of the nearby Virgo cluster. Fields around known cluster members and a pattern of blind fields along the major and minor axes of the cluster were studied with mosaic CCD...

Photometric properties of the Local Volume dwarf galaxies*

We present surface photometry and metallicity measurements for 104 nearby dwarf galaxies imaged with the Advanced Camera for Surveys and Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. In addition, we carried out photometry for 26 galaxies of the sample and for Sextans B on images of the Sloan Digital Sky Survey. Our sample comprises dwarf spheroidal...

VLA observations of the optical jets and nucleus of NGC 1097

Failure to detect the extended optical jets of NGC 1097 at 20 cm leads us to conclude that these jets are not the consequence of synchrotron emission, but rather of thermal bremsstrahlung emission. The flat spectrum at optical and near-infrared wavelengths and the lack of optical spectral lines set a lower temperature limit for the hot gas, while a null detection at X-ray...