Results 121 to 130 of about 1,494,639 (351)

An Alternative Origin for Hypervelocity Stars

, 2008
Halo stars with unusually high radial velocity ("hypervelocity" stars, or HVS) are thought to be stars unbound to the Milky Way that originate from the gravitational interaction of stellar systems with the supermassive black hole at the Galactic center ...
Abadi, Abadi, Bromley, Brown, Brown, Brown, Brown, Brown, Julio F. Navarro, Kenyon, Mario G. Abadi, Mateo, Matthias Steinmetz, Sesana, Xue   +14 more
core   +1 more source

XMM-Newton observation of a sample of four close dSph galaxies [PDF]

, 2015
We present the results of the analysis of deep archival \sat\ observations towards the dwarf spheroidal galaxies Draco, Leo I, Ursa Major II and Ursa Minor in the Milky Way neighbourhood.
De Paolis, F., Ingrosso, G., Manni, L., Nucita, A. A., Testa, V.   +4 more
core   +2 more sources

Dark Energy From the Gravitational Wave Background With Scalar Field Dark Matter

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT Recent observational results, such as those from pulsar timing arrays (PTA), suggest a low‐frequency Gravitational Wave Background (GWB) permeates our universe. This opens the possibility that gravitational waves could span a broader spectrum, potentially impacting cosmological scales.
Edwin L. Pérez‐Ochoa, Tonatiuh Matos
wiley   +1 more source

Growing Massive Black Holes in a Local Group Environment: the Central Supermassive, Slowly Sinking, and Ejected Populations

, 2011
We explore the growth of < 10^7 Msun black holes that reside at the centers of spiral and field dwarf galaxies in a Local Group type of environment. We use merger trees from a cosmological N-body simulation known as Via Lactea II (VL-2) as a framework to
Abel, Abel, Adams, Aguilar, Alexander, Baes, Baker, Begelman, Begelman, Bellovary, Berczik, Binney, Bogdanovic, Boker, Booth, Boylan-Kolchin, Bromm, Bromm, Bromm, Bullock, Burkert, Campanelli, Cattaneo, Colpi, Cote, Cox, Croton, David, Dekel, Di, Di, Di, Di Steffano, Diemand, Diemand, Dotti, Dotti, Ebisuzaki, Escala, Fan, Fender, Ferrarese, Ferrarese, Ferrarese, Gebhardt, Gebhardt, Ghez, Ghigna, Gnedin, Gonzalez, Gonzalez, Granato, Greenstein, Haehnelt, Haehnelt, Heger, Heggie, Hernquist, Herrmann, Ho, Holley-Bockelmann, Holley-Bockelmann, Holley-Bockelmann, Hopkins, Hopkins, Hopkins, Hopkins, Hu, Islam, Islam, Kauffmann, Kazantzidis, Kelly Holley-Bockelmann, Keres, Kesden, Komossa, Koppitz, Kormendy, Koushiappas, Kravtsov, Lehner, Loeb, Lousto, Maccarone, Maccarone, Maccarone, Mack, Madau, Makino, Marconi, Matthews, Mayer, Melia, Menou, Merloni, Merritt, Merritt, Micic, Micic, Mihos, Miller, Milosavljevic, Milosavljevic, Miroslav Micic, Monaco, Navarro, Nayakshin, Ostriker, O’Sullivan, Pedersen, Portegies, Quataert, Quinlan, Rees, Richstone, Robertson, Sales, Schneider, Schnittman, Schnittman, Sesana, Shakura, Shankar, Sigurdsson, Sijacki, Sijacki, Silk, Sinha, Soltan, Somerville, Sperhake, Steinn Sigurdsson, Taffoni, Tremaine, Trenti, Trenti, Valluri, van der Marel, Volonteri, Volonteri, Volonteri, Weinberg, Wise, Wyithe   +143 more
core   +1 more source

Gaia Search for Stellar Companions of TESS Objects of Interest V

Astronomische Nachrichten, EarlyView.
ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer, Ann‐Kathrin Kollak, Lara Pietsch, Kai‐Uwe Michel   +3 more
wiley   +1 more source

Mid-Infrared Colors of Dwarf Galaxies: Young Starbursts Mimicking Active Galactic Nuclei

, 2016
Searching for active galactic nuclei (AGN) in dwarf galaxies is important for our understanding of the seed black holes that formed in the early Universe. Here, we test infrared selection methods for AGN activity at low galaxy masses.
Greene, Jenny E., Hainline, Kevin N., Reines, Amy E., Stern, Daniel   +3 more
core   +1 more source

Exploring X-Ray Properties of Low-metallicity Dwarf Galaxies

The Astrophysical Journal
One of the primary outstanding questions in extragalactic astronomy is the formation and early evolution of the supermassive black holes that are seen in nearly every massive galaxy.
Jenna M. Cann, Kimberly A. Weaver, Ryan W. Pfeifle, Nathan J. Secrest, Shobita Satyapal, Mario Gliozzi   +5 more
doaj   +1 more source

Widening participation in outward student mobility: Successes, challenges and opportunities

British Educational Research Journal, EarlyView.
Abstract This article utilises data obtained through evaluation processes at Northumbria University to contribute to the emerging discourse on widening participation and outward student mobility. The rationale behind the study stems from the significant financial and non‐financial benefits associated with higher education and the UK's ongoing efforts ...
Joseph Mellors, Alejandra Vicencio
wiley   +1 more source

A Luminous X-Ray Active Galactic Nucleus in the Dwarf–Dwarf Galaxy Merger RGG 66

The Astrophysical Journal
We present the discovery of a luminous X-ray active galactic nucleus (AGN) in the dwarf galaxy merger RGG 66. The black hole is predicted to have a mass of M _BH ∼ 10 ^5.4 M _⊙ and to be radiating close to its Eddington limit ( L _bol / L _Edd ∼ 0.75 ...
Seth J. Kimbrell, Amy E. Reines
doaj   +1 more source

Quality Attributes of Four Kale Cultivars Grown in a High Tunnel Ecological Farming System

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca: Horticulture
The leafy green vegetables are rich sources of antioxidants, minerals, vitamins and dietary fiber, which cannot be produced by the human body, the only way for assimilation being by food ingestion.
Viorel TĂMAȘ, Alexandru Ioan APAHIDEAN, Cristina CHIOREAN, Sándor RÓZSA, Tincuța-Marta GOCAN, Rodica SIMA, Dănuț-Nicolae MĂNIUȚIU   +6 more
doaj   +1 more source