Results 41 to 50 of about 2,970 (256)

Pegasus W: An Ultrafaint Dwarf Galaxy Outside the Halo of M31 Not Quenched by Reionization

The Astrophysical Journal, 2023
We report the discovery of an ultrafaint dwarf (UFD) galaxy, Pegasus W, located on the far side of the Milky Way–M31 system and outside the virial radius of M31.
Kristen B. W. McQuinn, Yao-Yuan Mao, Matthew R. Buckley, David Shih, Roger E. Cohen, Andrew E. Dolphin   +5 more
doaj   +1 more source

Do satellite galaxies trace matter in galaxy clusters? [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
The spatial distribution of satellite galaxies encodes rich information of the structure and assembly history of galaxy clusters. In this paper, we select a redMaPPer cluster sample in SDSS Stripe 82 region with $0.1 \le z \le 0.33$, $200.7$. Using the high-quality weak lensing data from CS82 Survey, we constrain the mass profile of this sample.
Chunxiang Wang, Chunxiang Wang, Jean-Paul Kneib, Jean-Paul Kneib, Gang Chen, Wenting Wang, Martin Makler, Marcio A. G. Maia, Lin Wang, Maria E. S. Pereira, Thomas Erben, Ran Li, Liang Gao, Liang Gao, Huanyuan Shan, Huanyuan Shan   +15 more
openaire   +4 more sources

The Dwarf Satellites of M31 and the Galaxy [PDF]

The Astronomical Journal, 2006
The satellite systems of M31 and the Galaxy are compared. It is noted that all five of the suspected stripped dSph cores of M31 companions are located within a projected distance of 40 kpc of from the nucleus of this galaxy, whereas the normal dSph companions to this object have distances > 40 kpc from the center of M31.
openaire   +3 more sources

The origin of the enhanced metallicity of satellite galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
Observations of galaxies in the local Universe have shown that both the ionized gas and the stars of satellites are more metal-rich than of equally massive centrals. To gain insight into the connection between this metallicity enhancement and other differences between centrals and satellites, such as their star formation rates, gas content, and growth ...
Bahé, Y.M., Schaye, J., Crain, R.A., McCarthy, I.G., Bower, R.G., Theuns, T., McGee, S.L., Trayford, J.W.   +7 more
openaire   +5 more sources

An LBT view of the Andromeda’s satellite galaxies [PDF]

EPJ Web of Conferences, 2017
Results are presented on deep (V ∼ 26.5 mag) time series observations of four dwarf spheroidal galaxies (dSphs) in the Andromeda (M31) complex, namely, And XIX, And XXI, And XXV and And XXVII, that we have observed with the Large Binocular Telescope (LBT). We discovered in these galaxies a total of over 200 RR Lyrae stars and 19 Anomalous Cepheids.
Michele Cignoni, A. Garofalo, A. Garofalo, Gisella Clementini, Felice Cusano   +4 more
openaire   +5 more sources

AGN-driven quenching of satellite galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
ABSTRACT We explore the effect of active galactic nucleus (AGN) feedback from central galaxies on their satellites by comparing two sets of cosmological zoom-in runs of 27 haloes with masses ranging from 1012 to 1013.4$\rm {M}_{\odot}$ at z = 0, with (wAGN) and without (noAGN) AGN feedback.
Jeremiah P. Ostriker, Jeremiah P. Ostriker, Gohar Dashyan, Michaela Hirschmann, Michaela Hirschmann, Amanda C. N. Quirk, Rachel S. Somerville, Rachel S. Somerville, Thorsten Naab, Ena Choi   +9 more
openaire   +3 more sources

The Dynamics of Satellite Galaxies [PDF]

Publications of the Astronomical Society of the Pacific, 1992
We use the positions and velocities of satellites of our galaxy and of other spiral galaxies to determine the radial mass profile of dark matter halos. We combine our measurement of the velocities of five remote Galactic satellites with published observations of the other Galactic satellites to obtain a complete sample of test particles.
openaire   +2 more sources

THE SUBHALO-SATELLITE CONNECTION AND THE FATE OF DISRUPTED SATELLITE GALAXIES [PDF]

The Astrophysical Journal, 2009
9 pages, 7 figures. References added.
Yang, XH, Mo, HJ, van den Bosch, FC
openaire   +5 more sources

A Proof‐of‐Concept Assessment of a Novel Wearable Eyelid Muscle Device: A Pre‐Clinical Animal Cadaver Study for Eyelid Closure Restoration

Advanced Robotics Research, EarlyView.
This article introduces a soft wearable eyelid sling device incorporating a hydraulic soft artificial muscle (SAM) for achieving complete closure of an eyelid. The SAM is driven by a cam mechanism that provides a displacement profile closely matched with those of a healthy eyelid.
Patrick Pruscino, Phuoc Thien Phan, James Davies, Bibhu Sharma, Tianruo Guo, Chi Cong Nguyen, Nigel H. Lovell, Thanh Nho Do   +7 more
wiley   +1 more source

The cosmological constant derived via galaxy groups and clusters

European Physical Journal C: Particles and Fields, 2019
The common nature of dark matter and dark energy is argued in Gurzadyan (Eur Phys J Plus 134:14, 2019) based on the approach that the cosmological constant $$\varLambda $$ Λ enters the weak-field General Relativity following from Newton theorem on the ...
V. G. Gurzadyan, A. Stepanian
doaj   +1 more source