Results 71 to 80 of about 12,959,376 (400)

Morphological transformation of dwarf galaxies in the Local Group [PDF]

, 2015
In the Local Group there are three main types of dwarf galaxies: Dwarf Irregulars, Dwarf Spheroidals, and Dwarf Ellipticals. Intermediate/transitional types are present as well.
Carraro, Giovanni
core   +1 more source

The stripping of a galaxy group diving into the massive cluster A2142 [PDF]

, 2014
Structure formation in the current Universe operates through the accretion of group-scale systems onto massive clusters. The detection and study of such accreting systems is crucial to understand the build-up of the most massive virialized structures we ...
D. Eckert, D. Eckert, S. Molendi, M. Owers, M. Gaspari, T. Venturi, L. Rudnick, S. Ettori, S. Paltani, F. Gastaldello, F. Gastaldello, M. Rossetti, M. Rossetti   +12 more
semanticscholar   +1 more source

A Second Galaxy Missing Dark Matter in the NGC 1052 Group [PDF]

Astrophysical Journal, 2019
The ultra-diffuse galaxy NGC1052-DF2 has a very low velocity dispersion, indicating that it has little or no dark matter. Here we report the discovery of a second galaxy in this class, residing in the same group. NGC1052-DF4 closely resembles NGC1052-DF2
P. V. van Dokkum, S. Danieli, R. Abraham, C. Conroy, A. Romanowsky   +4 more
semanticscholar   +1 more source

The 2dF Galaxy Redshift Survey: the clustering of galaxy groups [PDF]

Monthly Notices of the Royal Astronomical Society, 2004
16 pages.
Padilla, Nelson D., Baugh, Carlton M., Eke, Vincent R., Norberg, Peder, Cole, Shaun, Frenk, Carlos S., Croton, Darren, Baldry, Ivan K., Bland-Hawthorn, Joss, Bridges, Terry, Cannon, Russell, Colless, Matthew, Collins, Chris, Couch, Warrick, Dalton, Gavin, De Propris, Roberto, Driver, Simon P., Efstathiou, George, Ellis, Richard S., Glazebrook, Karl, Jackson, Carole, Lahav, Ofer, Lewis, Ian, Lumsden, Stuart, Maddox, Steve, Madgwick, Darren, Peacock, John A., Peterson, Bruce A., Sutherland, Will, Taylor, Keith   +29 more
openaire   +6 more sources

The zCOSMOS redshift survey: how group environment alters global downsizing trends [PDF]

, 2009
Context. Groups of galaxies are a common environment, bridging the gap between starforming field galaxies and quiescent cluster galaxies. Within groups secular processes could be at play, contributing to the observed strong decrease of star formation ...
Abbas, U., Bardelli, S., Bolzonella, M., Bongiorno, A., Bottini, D., Cappi, A., Caputi, K., Carollo, C. M., Cassata, P., Cimatti, A., Contini, T., Coppa, G., Cucciati, O., de la Torre, S., de Ravel, L., Finoguenov, A., Franzetti, P., Garilli, B., Guzzo, L., Halliday, C., Iovino, A., Kampczyk, P., Kneib, J.-P., Knobel, C., Koekemoer, A. M., Kovač, K., Lamareille, F., Le Borgne, J.-F., Le Brun, V., Le Fèvre, O., Leauthaud, A., Lilly, S., Maccagni, D., Maier, C., Mainieri, V., Marinoni, C., McCracken, H. J., Memeo, P., Meneux, B., Mignoli, M., Oesch, P., Pellò, R., Peng, Y., Porciani, C., Pozzetti, L., Pérez-Montero, E., Renzini, A., Ricciardelli, E., Scaramella, R., Schiminovich, D., Scodeggio, M., Scoville, N., Silverman, J. D., Tanaka, M., Tasca, L. A. M., Tresse, L., Vergani, D., Zamorani, G., Zucca, E.   +58 more
core   +6 more sources

SEARCHING FOR DIFFUSE LIGHT IN THE M96 GALAXY GROUP [PDF]

, 2014
We present deep, wide-field imaging of the M96 galaxy group (also known as the Leo I Group). Down to surface brightness limits of μB = 30.1 and μV = 29.5, we find no diffuse, large-scale optical counterpart to the “Leo Ring,” an extended H i ring ...
A. Watkins, J. C. Mihos, P. Harding, J. Feldmeier   +3 more
semanticscholar   +1 more source

Groups of Galaxies [PDF]

Highlights of Astronomy, 1977
I would like to report on some work that Ed Turner and I have done on groups of galaxies and how groups may be used to obtain useful cosmological information. Of course the classic study of groups of galaxies was done by de Vaucouleurs (1975) who made a catalogue of groups and loose associations of galaxies in the local supercluster. Partly to obtain a
openaire   +1 more source

HCG 57: Evidence for Shock-heated Intergalactic Gas from X-Rays and Optical Emission Line Spectroscopy

The Astrophysical Journal
We present Chandra and XMM-Newton X-ray observations of the compact group HCG 57, and optical integral field spectroscopy of the interacting galaxy pair HCG 57A/D.
Ewan O’Sullivan, P. N. Appleton, B. A. Joshi, Lauranne Lanz, Katherine Alatalo, Jan M. Vrtilek, Andreas Zezas, Laurence P. David   +7 more
doaj   +1 more source

RX J1548.9+0851, a fossil cluster? [PDF]

, 2012
Fossil galaxy groups are spatially extended X-ray sources with X-ray luminosities above L_X,bol > 10^42 h_50^-2 ergs s^-1 and a central elliptical galaxy dominating the optical, the second-brightest galaxy being at least 2 magnitudes fainter in the R ...
Adelman-McCarthy, Barnes, Biviano, Cypriano, Dariush, D’Onghia, Ebrová, Eigenthaler, Eigenthaler, Evrard, Firth, Girardi, Hartley, Hopkins, Horne, Jacoby, Jones, Khosroshahi, Khosroshahi, Khosroshahi, Koleva, Kurtz, Le Borgne, Mendes de Oliveira, Mendes de Oliveira, Miller, Mukai, Navarro, Osmond, P. Eigenthaler, Pierini, Ponman, Proctor, Prugniel, Ramella, Sales, Santos, Schirmer, Sodré, Springel, Sun, Tonry, Ulmer, Vikhlinin, Voges, W. W. Zeilinger, Wu, Yoshioka   +47 more
core   +1 more source

The bow shock, cold fronts and disintegrating cool core in the merging galaxy group RX J0751.3+5012 [PDF]

, 2014
We present a new Chandra X-ray observation of the off-axis galaxy group merger RX J0751.3+5012. The hot atmospheres of the two colliding groups appear highly distorted by the merger. The images reveal arc-like cold fronts around each group core, produced
H. Russell, H. Russell, A. Fabian, B. McNamara, B. McNamara, B. McNamara, A. Edge, J. Sanders, P. Nulsen, S. Baum, M. Donahue, C. O’Dea   +11 more
semanticscholar   +1 more source