Results 91 to 100 of about 72,254 (220)

The Milky Way's Fermi Bubbles: Echoes of the Last Quasar Outburst?

, 2011
{\it Fermi}-LAT has recently detected two gamma ray bubbles disposed symmetrically with respect to the Galactic plane. The bubbles have been suggested to be in a quasi-steady state, inflated by ongoing star formation over the age of the Galaxy.
A. R. King, Baganoff, Bonnell, Cheng, Crocker, Crocker, Cuadra, Cuadra, Cuadra, Ferrarese, Genzel, Ghez, Ghez, Goodman, Greene, Hobbs, Hobbs, K. Zubovas, King, King, King, King, King, King, King, Kinney, Kolykhalov, Kormendy, Levin, Lu, McLaughlin, Morris, Morris, Nagar, Narayan, Nayakshin, Nayakshin, Nayakshin, Nayakshin, Paczynski, Paumard, Paumard, Ponti, Pounds, Pounds, Revnivtsev, S. Nayakshin, Schödel, Shakura, Silk, Snowden, Soltan, Su, Thompson, Tombesi, Tombesi, Wardle   +56 more
core   +1 more source

Gas accretion in disk galaxies

, 2013
Gas accretion is necessary to maintain star formation, spiral and bar structure, and secular evolution in galaxies. This can occur through tidal interaction, or mass accretion from cosmic filaments. Different processes will be reviewed to drive gas towards galaxy centers and trigger starbursts and AGN. The efficiency of these dynamical processes can be
openaire   +2 more sources

Proteomic analysis of the zone of degeneration at the mitosis–meiosis transition stage in wild‐caught male catshark (Scyliorhinus canicula), correlated with an unusually high‐water temperature in the English Channel

Journal of Fish Biology, EarlyView.
Abstract In the context of current global change, variations in water temperature are one of the environmental conditions with serious consequences for marine life, including reproductive processes. In the small spotted catshark Scyliorhinus canicula, spermatogenesis occurs in spermatocysts composed of synchronously developing germ cells associated ...
Fabian Jeanne, Stanislas Pilet, Sean Heighton, Benoît Bernay, Pascal Sourdaine   +4 more
wiley   +1 more source

Satellite Alignment: I. Distribution of Substructures and Their Dependence On Assembly History From N-Body Simulations

, 2014
Observations have shown that the spatial distribution of satellite galaxies is not random, but aligned with the major axes of central galaxies. This alignment is dependent on galaxy properties, such that red satellites are more strongly aligned than blue
Dutton, Aaron, Kang, Xi, Lin, Weipeng, Macciò, Andrea. V., Wang, Yang Ocean, Yu, Yu   +5 more
core   +1 more source

A quasi-spherical inner accretion flow in Seyfert galaxies [PDF]

AIP Conference Proceedings, 2001
12 pages, 9 figures, accepted for publication in ...
openaire   +3 more sources

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Baryon-induced Collapse of Dark Matter Cores into Supermassive Black Holes

The Astrophysical Journal Letters
Nonlinear structure formation for fermionic dark matter particles leads to dark matter density profiles with a degenerate compact core surrounded by a diluted halo. For a given fermion mass, the core has a critical mass that collapses into a supermassive
C. R. Argüelles, J. A. Rueda, R. Ruffini   +2 more
doaj   +1 more source

Consequences of Mechanical and Radiative Feedback from Black Holes in Disc Galaxy Mergers

, 2014
We study the effect of AGN mechanical and radiation feedback on the formation of bulge dominated galaxies via mergers of disc galaxies. The merging galaxies have mass-ratios of 1:1 to 6:1 and include pre-existing hot gaseous halos to properly account for
Choi, Ena, Johansson, Peter H., Moster, Benjamin P., Naab, Thorsten, Ostriker, Jeremiah P.   +4 more
core   +1 more source

Shock metamorphic effects in Itokawa phosphates: A comparison with megaregolith‐derived meteorites

Meteoritics &Planetary Science, EarlyView.
Abstract Returned regolith samples from the asteroid Itokawa provide a unique opportunity to compare shock metamorphic effects in unconsolidated regolith materials with those preserved in lithified meteorites, that is, megaregolith. We analyzed four Itokawa particles (Ueda—RA‐QD02‐0519, Narahara—RA‐QD02‐0573, Domon—RA‐QD02‐0588, Ishiuchi—RX‐MD03‐0212 ...
E. Dobrică, A. N. Krot, A. J. Brearley
wiley   +1 more source

Initial study of regolith exposure ages and burial conditions on Ryugu: Cosmogenic nuclides score in two touchdowns

Meteoritics &Planetary Science, EarlyView.
Abstract Surface processes on the asteroid Ryugu have been investigated using cosmic‐ray‐produced radionuclides, 10Be, 26Al, and 36Cl, and stable noble gases, on eight samples returned by the Hayabusa2 spacecraft. The 10Be and 26Al along with 21Ne measurements indicate that the two Chamber A samples A0105 collected during the first touchdown (TD) were ...
Kunihiko Nishiizumi, Keisuke Nagao, Marc W. Caffee, Ryuji Okazaki, Jozef Masarik, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hiroshi Naraoka, Hikaru Yabuta, Kanako Sakamoto, Kasumi Yogata, Toru Yada, Shogo Tachibana, Sei‐ichiro Watanabe, Yuichi Tsuda, Masanao Abe, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Hirotaka Sawada, Satoshi Tanaka, Tomohiro Usui, Koji Wada, Hajime Yano, Makoto Yoshikawa, Hayabusa2 Initial Analysis Volatile Team   +30 more
wiley   +1 more source