Results 21 to 30 of about 1,494,639 (351)

Shades of Black: Searching for Brown Dwarfs & Giant Planets

, 1998
We have searched, so far in vain, for brown dwarfs or giant planets in the vicinity of several nearby stars using cameras built at Universite de Montreal attached to the CFHT Adaptive Optics system. Here, we show how pairs of images taken simultaneously through separate filters on, and off, the 1.6 micron methane absorption band, can be used to ...
Walker, Gordon, Chapman, Scott, Mandushev, Georgi, Racine, Rene, Nadeau, Daniel, Doyon, Rene, Veran, Jean-Pierre   +6 more
openaire   +4 more sources

Intermediate-mass black holes in dwarf galaxies out to redshift $\sim$ 2.4 in the Chandra COSMOS Legacy Survey [PDF]

, 2018
We present a sample of 40 AGN in dwarf galaxies at redshifts $z \lesssim$ 2.4. The galaxies are drawn from the \textit{Chandra} COSMOS-Legacy survey as having stellar masses $10^{7}\leq M_{*}\leq3 \times 10^{9}$ M$_{\odot}$.
Civano, F., Fabbiano, G., Marchesi, S., Mezcua, M., Suh, H., Volonteri, M.   +5 more
core   +3 more sources

An Accreting Supermassive Black Hole Buried in a Faint Dwarf Galaxy

The Astrophysical Journal Letters
Abstract In the last decade, there have been several discoveries of Active Galactic Nuclei (AGN) in dwarf galaxies including an AGN in an ultra-compact dwarf galaxy with a Black Hole mass >106 M⊙. However, finding a Supermassive Black Hole (SMBH) in a dwarf Low Surface Brightness (LSB) galaxy is rare.
Abhishek Paswan, Mousumi Das, K Rubinur
openaire   +3 more sources

Rice Black-streaked Dwarf Virus Preparation and Infection on Rice [PDF]

BIO-PROTOCOL, 2017
Rice black-streaked dwarf virus (RBSDV), a member of genus Fijivirus in the family Reoviridae, infects rice, maize, barley and wheat, and can seriously affect crop yields. RBSDV is transmitted by the small brown planthopper (Laodelphax striatellus, SBPH) in a persistent manner.
Hengmu Zhang, Zhang Hehong, Xiaoxiang Tan, Sun Zongtao, Chen Jianping, Kaili Xie   +5 more
openaire   +5 more sources

Molecular characteristics of segment 5, a unique fragment encoding two partially overlapping ORFs in the genome of rice black-streaked dwarf virus.

PLoS ONE, 2019
Rice black-streaked dwarf virus (RBSDV), a ds-RNA virus in Fijivirus genus with family Reoviridae, which is transmitted by the small brown planthopper, is responsible for incidence of maize rough dwarf disease (MRDD) and rice black-streaked dwarf disease
Hongyue Zu, Hong Zhang, Minhao Yao, Jiayue Zhang, Hong Di, Lin Zhang, Ling Dong, Zhenhua Wang, Yu Zhou   +8 more
doaj   +3 more sources

Intermediate-mass black holes: finding of episodic, large-scale and powerful jet activity in a dwarf galaxy [PDF]

Monthly notices of the Royal Astronomical Society, 2023
Dwarf galaxies are characterised by a very low luminosity and low mass. Because of significant accretion and ejection activity of massive black holes, some dwarf galaxies also host low-luminosity active galactic nuclei (AGNs). In a few dwarf AGNs, very
J. Yang, Z. Paragi, S. Frey, L. Gurvits, M. Liao, Xiang Liu, L. Cui, Xiaolong Yang, W. Chen, E. Varenius, J. Conway, Ru-Rong Chen, Ningbo Institute of Materials Technology, O. Observatory, Sweden., J. Eric, The Netherlands., K. Observatory, Research Centre in Astronomy, Earth Sciences, Hungary., Cas Key Laboratory for Research in Galaxies, Cosmology, University of Electronic Science, T. China, Xinjiang Astronomical Observatory, China., S. Observatory, Yunnan Observatories, Cas, National Astronomical Observatories   +30 more
semanticscholar   +1 more source

The impact of primordial black holes on the stellar mass function of ultra-faint dwarf galaxies [PDF]

Monthly notices of the Royal Astronomical Society, 2023
If primordial black holes constitute the dark matter, stars forming in dark-matter dominated environments with low velocity dispersions, such as ultra-faint dwarf galaxies, may capture a black hole at birth.
Nicolas Esser, S. De Rijcke, P. Tinyakov
semanticscholar   +1 more source

Dehnen halo effect on a black hole in an ultra-faint dwarf galaxy [PDF]

Journal of Cosmology and Astroparticle Physics, 2022
There had been recent advancement toward the detection of ultra-faint dwarf galaxies, which may serve as a useful laboratory for dark matter exploration since some of them contains almost 99% of pure dark matter. The majority of these galaxies contain no
R. C. Pantig, A. Övgün
semanticscholar   +1 more source

Black-hole-triggered star formation in the dwarf galaxy Henize 2-10 [PDF]

Nature, 2022
Black-hole-driven outflows have been observed in some dwarf galaxies with active galactic nuclei1, and probably play a role in heating and expelling gas (thereby suppressing star formation), as they do in larger galaxies2.
Zachary Schutte, A. Reines
semanticscholar   +1 more source

A Hidden Population of Massive Black Holes in Simulated Dwarf Galaxies [PDF]

Astrophysical Journal, 2022
We explore the characteristics of actively accreting massive black holes (MBHs) within dwarf galaxies in the Romulus25 cosmological hydrodynamic simulation. We examine the MBH occupation fraction, X-ray active fractions, and active galactic nucleus (AGN)
Ray S. Sharma, A. Brooks, M. Tremmel, J. Bellovary, Angelo Ricarte, T. Quinn   +5 more
semanticscholar   +1 more source