Nearby groups of galaxies in the Hercules-Bootes constellations

Abstract

We consider a sample of 412 galaxies with radial velocities $V_{\mathrm{LG}}<2500$ km s${}^{-1}$ situated in the sky region of $\mathrm{RA}=13^h.0$ ... $19^h.0$, $\mathrm{Dec}=+10^{\circ }$ ... $+40^{\circ }$ between the Local Void and the Supergalactic plane. One hundred and eighty-one of them have individual distance estimates. Peculiar velocities of the galaxies as a function of Supergalactic latitude SGB show signs of Virgocentric infall at $SGB<10^{\circ }$ and motion from the Local Void at $SGB>60^{\circ }$. A half of the Hercules-Bootes galaxies belong to 17 groups and 29 pairs, with the richest group around NGC5353. A typical group is characterized by the velocity dispersion of $67$ km s${}^{-1}$, the harmonic radius of $182$ kpc, the stellar mass of $4.3\times 10^{10}{M}_{\odot }$ and the virial-to-stellar mass ratio of $32$. The binary galaxies have the mean radial velocity difference of $37$ km s${}^{-1}$, the projected separation of $96$ kpc, the mean integral stellar mass of $2.6\times 10^9{M}_{\odot }$ and the mean virial-to-stellar mass ratio of about $8$. The total dark-matter-to-stellar mass ratio in the considered sky region amounts to $37$ being almost the same as that in the Local Volume.

11 pages, 5 figures, 4 tables. Accepted to Astrophysical Bulletin

References in corpus (13)

• HyperLEDA. III. The catalogue of extragalactic distances
• Cosmicflows-3
• The Northern HIPASS catalogue - Data presentation, completeness and reliability measures
• Near-Infrared and Optical Luminosity Functions from the 6dF Galaxy Survey
• Minivoids in the Local Volume
• Large-scale filamentary structures around the Virgo cluster revisited
• Midlife Crises in Dwarf Galaxies in the NGC 5353/4 Group
• Orbital masses of nearby luminous galaxies
• Binary Galaxies in the Local Supercluster and Its Neighborhood
• A List of Groups of Dwarf Galaxies in the Local Supercluster
• Draining the Local Void
• Large-scale structure and galaxy motions in the Leo/Cancer constellations
• Galaxy motions in the Bootes strip

Cited by in corpus (7)

• MOND in galaxy groups: a superior sample
• The cosmological constant derived via galaxy groups and clusters
• On the common nature of dark matter and dark energy: galaxy groups
• H_0 tension: clue to common nature of dark sector?
• MOND in galaxy groups
• Surveying the Local Supercluster Plane
• Observational diversity of bright long-lived Type II supernovae