Results 121 to 130 of about 97,868 (355)

DWARF GALAXY DARK MATTER DENSITY PROFILES INFERRED FROM STELLAR AND GAS KINEMATICS [PDF]

, 2014
We present new constraints on the density profiles of dark matter (DM) halos in seven nearby dwarf galaxies from measurements of their integrated stellar light and gas kinematics.
J. Adams, J. Simon, M. Fabricius, R. V. D. van den Bosch, J. Barentine, R. Bender, K. Gebhardt, G. Hill, J. Murphy, R. Swaters, Jens Thomas, G. van de Ven   +11 more
semanticscholar   +1 more source

Multitarget Recognition of Flower Images Based on Lightweight Deep Neural Network and Transfer Learning

Advanced Intelligent Systems, EarlyView.
This article proposes a lightweight YOLOv4‐based detection model using MobileNetV3 or CSPDarknet53_tiny, achieving 30+ FPS and higher mAP. It also presents a ShuffleNet‐based classification model with transfer learning and GAN‐augmented images, improving generalization and accuracy.
Qingyang Liu, Yanrong Hu, Hongjiu Liu
wiley   +1 more source

Probing the Dark Matter Halos of External Galaxies with Stellar Streams

The Astrophysical Journal
Stellar streams have proven to be powerful tools for measuring the Milky Way’s gravitational potential and hence its dark matter (DM) halo. In the coming years, the Vera Rubin Observatory, Euclid, ARRAKIHS, and the Nancy Grace Roman Space Telescope will ...
Madison Walder, Denis Erkal, Michelle Collins, David Martínez-Delgado   +3 more
doaj   +1 more source

Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125 and NGC7619. Constraints on the outer dark halo density profile

, 2010
We present high quality long slit spectra along the major and minor axes out to 1.5-2 Re (14-22 kpc) of three bright elliptical galaxies (NGC1600, NGC4125, NGC7619) obtained at the Hobby-Eberly Telescope (HET).
Bender, Bender, Bender, Bender, Bender, Bender, Bender, Bender, Bernardi, Bertola, Bower, Bridges, Burstein, Cappellari, Clemens, Collobert, Condon, Davies, Denicoló, Djorgovski, Dressler, Faber, Fisher, Fisher, Franx, Fukazawa, Gerhard, Goudfrooij, Halkola, Hernquist, Humphrey, J. Thomas, Kauffmann, Kim, Kobayashi, Kodama, Koopmans, Korn, Kroupa, Kuntschner, Larson, Larson, Li, Longhetti, Longhetti, M. H. Fabricius, Magorrian, Maraston, Maraston, Matkovic, Mehlert, Morelli, Naab, Napolitano, Navarro, Nieto, Nomoto, O'Sullivan, Peletier, Puzia, R. Bender, R. P. Saglia, Rembold, Richstone, S. B. Pu, Saglia, Saglia, Sandage, Sarzi, Schwarzschild, Scott, Serra, Shetrone, Sánchez-Blázquez, Sánchez-Blázquez, Tantalo, Tantalo, Terlevich, Thielemann, Thomas, Thomas, Thomas, Thomas, Thomas, Thomas, Thomas, Thomas, Tinsley, Tinsley, Trager, Trager, Trager, Trager, van Dokkum, Vazdekis, Weijmans, White, White, Wiklind, Worthey, Worthey, Z. Han, Ziegler   +102 more
core   +1 more source

Galaxy Ecosystems: gas contents, inflows and outflows [PDF]

, 2015
We use a set of observational data for galaxy cold gas mass fraction and gas phase metallicity to constrain the content, inflow and outflow of gas in central galaxies hosted by halos with masses between $10^{11} M_{\odot}$ to $10^{12} M_{\odot}$. The gas
Lu, Yu, Lu, Zhankui, Mo, H. J.
core   +1 more source

DETECTION OF A DISTINCT METAL-POOR STELLAR HALO IN THE EARLY-TYPE GALAXY NGC 3115 [PDF]

, 2014
We present the resolved stellar populations in the inner and outer halo of the nearby lenticular galaxy NGC 3115. Using deep Hubble Space Telescope observations, we analyze stars 2 mag fainter than the tip of the red giant branch (TRGB).
M. Peacock, J. Strader, A. Romanowsky, J. Brodie   +3 more
semanticscholar   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, EarlyView.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

Merger-driven Growth of Intermediate-mass Black Holes: Constraints from Hubble Space Telescope Imaging of Hyper-luminous X-Ray Sources

The Astrophysical Journal
Hyper-luminous X-ray sources (HLXs) are extragalactic off-nuclear X-ray sources with luminosities exceeding the theoretical limit for accretion onto stellar-mass compact objects.
R. Scott Barrows, Mar Mezcua, Julia M. Comerford, Daniel Stern   +3 more
doaj   +1 more source

Photometric Objects Around Cosmic Webs (PAC) Delineated in a Spectroscopic Survey. IV. High-precision Constraints on the Evolution of the Stellar–Halo Mass Relation at Redshift z < 0.7

The Astrophysical Journal, 2023
Taking advantage of the Photometric objects Around Cosmic webs method developed in Paper I, we measure the excess surface density ${\bar{n}}_{2}{w}_{{\rm{p}}}$ of the photometric objects around spectroscopic objects down to stellar masses 10 ^8.0 M _ ...
Kun Xu, Y. P. Jing, Yun Zheng, Hongyu Gao   +3 more
doaj   +1 more source

The connection between the host halo and the satellite galaxies of the Milky Way [PDF]

, 2016
Many properties of the Milky Way's dark matter halo, including its mass assembly history, concentration, and subhalo population, remain poorly constrained.
Benson, Andrew, Boylan-Kolchin, Michael, Lu, Yu, Mao, Yao-Yuan, Peter, Annika H. G., Tonnesen, Stephanie, Wechsler, Risa H., Wetzel, Andrew R.   +7 more
core   +3 more sources