Results 31 to 40 of about 162,871 (277)

Shakhbazian compact galaxy groups. II. Photometric and spectroscopic study of ShCG 376 [PDF]

, 2003
The results of the redshift measurements and of the detailed surface photometry in BVR of the compact group ShCG 376 are presented. The radial velocity dispersion, the virial mass, the total luminosity, the M/L ratio, and the crossing time of the group ...
Alonso, Amirkhanian, Arp, Baier, Burbidge, del Olmo, di Tullio, G. H. Tovmassian, H. M. Tovmassian, H. Tiersch, Hickson, Kirshner, Kodaira, Kodaira, Kodaira, Lynds, Mirzoyan, Moles, Robinson, Schlegel, Schombert, Shakhbazian, Stoll, Sulentic, Sulentic, Tiersch, Tiersch, Tiersch, Tovmassian, Tovmassian, Tovmassian, V. H. Chavushyan, Zickgraf   +32 more
core   +2 more sources

ALIGNMENTS OF GROUP GALAXIES WITH NEIGHBORING GROUPS [PDF]

The Astrophysical Journal, 2009
13 pages, 16 figures, accepted by ...
Xiaohu Yang, Yun-Young Choi, Yougang Wang, Xuelei Chen, Changbom Park   +4 more
openaire   +3 more sources

Analysis of the escape in systems with four exit channels

Mathematical Methods in the Applied Sciences, Volume 46, Issue 1, Page 1032-1044, 15 January 2023., 2023
In this paper, we have performed a numerical investigation of the escape of a particle from two different dynamical systems with the same number of exit channels. We have chosen specific values of the parameters of the systems so that the openings of the potential well in both systems are approximately of the same size.
Juan F. Navarro, Ibrahim Belgharbi, María del Carmen Martínez‐Belda   +2 more
wiley   +1 more source

The influence of halo assembly on galaxies and galaxy groups [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
In this paper, we study the variations of group galaxy properties according to the assembly history in SDSS-DR6 selected groups. Using mock SDSS group catalogues, we find two suitable indicators of group formation time: i) the isolation of the group, defined as the distance to the nearest neighbor in terms of its virial radius, and ii) the ...
Tatiana Zapata, Tatiana Zapata, Patricia B. Tissera, Josefa Perez, Nelson Padilla   +4 more
openaire   +5 more sources

Elemental Abundances in M31: Individual and Coadded Spectroscopic [Fe/H] and [α/Fe] throughout the M31 Halo with SPLASH

The Astrophysical Journal, 2023
We present spectroscopic chemical abundances of red giant branch stars in Andromeda (M31), using medium-resolution ( R ∼ 6000) spectra obtained via the Spectroscopic and Photometric Landscape of Andromeda’s Stellar Halo survey.
J. Leigh Wojno, Karoline M. Gilbert, Evan N. Kirby, Ivanna Escala, Puragra Guhathakurta, Rachael L. Beaton, Jason Kalirai, Masashi Chiba, Steven R. Majewski   +8 more
doaj   +1 more source

Low Mass Group Environments have no Substantial Impact on the Circumgalactic Medium Metallicity [PDF]

, 2020
We explore how environment affects the metallicity of the circumgalactic medium (CGM) using 13 low mass galaxy groups (2-5 galaxies) at $\langle z_{abs}\rangle=0.25$ identified near background quasars.
Charlton, Jane C., Churchill, Christopher W., Kacprzak, Glenn G., Murphy, Michael T., Muzahid, Sowgat, Nielsen, Nikole M., Pointon, Stephanie K.   +6 more
core   +3 more sources

Galaxy pairs in the Local Group [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2013
Abstract Current models of galaxy formation predict that galaxy pairs of comparable magnitudes should become increasingly rare with decreasing luminosity. This seems at odds with the relatively high frequency of pairings among dwarf galaxies in the Local Group. We use literature data to show that ∼30 per cent of all the satellites of the
Fattahi, Azadeh, Navarro, Julio F., Starkenburg, Else, Barber, Christopher R., McConnachie, Alan W.   +4 more
openaire   +3 more sources

Redshifts of the Gravitational Lenses MG0414+0534 and MG0751+2716 [PDF]

, 1998
We report redshifts in two gravitational lens systems, MG0414+0534 and MG0751+2716. The lens galaxy in MG0414+0534 lies at z_l=0.9584+/-0.0002. The luminosity and extreme red color of the lens are then typical of a passively evolving, early-type, ~2L ...
Christopher S. Kochanek, Helbig P., Hogg D. W., John L. Tonry, Malhotra S., Refsdal S.   +5 more
core   +2 more sources

Reionization of the Local Group of galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2011
We present the first detailed structure formation and radiative transfer simulations of the reionization history of our cosmic neighbourhood. To this end, we follow the formation of the Local Group of galaxies and nearby clusters by means of constrained simulations, which use the available observational constraints to construct a representation of ...
Garrelt Mellema, Gustavo Yepes, Stefan Gottlöber, Yehuda Hoffman, Ilian T. Iliev, Ilian T. Iliev, Ben Moore   +6 more
openaire   +6 more sources

Infall of galaxies onto groups [PDF]

Astronomy & Astrophysics, 2020
Context.The growth of the structure within the Universe manifests in the form of accretion flows of galaxies onto groups and clusters. Thus, the present-day properties of groups and their member galaxies are influenced by the characteristics of this continuous infall pattern.
Diego G. Lambas, Diego G. Lambas, M. L. Ceccarelli, M. L. Ceccarelli, María Victoria Santucho, María Victoria Santucho   +5 more
openaire   +4 more sources