Results 91 to 100 of about 53,848 (207)

Mapping the Galaxy Color–Star Formation Rate Relation with Manifold Learning and Infrared Image Stacking

The Astrophysical Journal
Modern surveys present us with billions of faint galaxies for which we only have broadband images in ∼6–8 optical-to-near-infrared (NIR) filters. Galaxy star formation rates (SFRs) are difficult to estimate accurately without spectroscopic diagnostics or
Yu-Heng Lin, Daniel Masters, Andreas L. Faisst, Harry Teplitz, Olivier Ilbert, Matthieu Bethermin, Shoubaneh Hemmati, Vihang Mehta, Jason D. Rhodes, Gregory L. Walth   +9 more
doaj   +1 more source

A Simple Model of the Radio–Infrared Correlation Depending on Gas Surface Density and Redshift

The Astrophysical Journal
We introduce a simple parametric model of the radio–infrared correlation (i.e., the ratio between the IR luminosity and the 1.4 GHz radio luminosity, q _IR ) by considering the energy loss rate of high-energy cosmic-ray (CR) electrons governed by ...
Ilsang Yoon
doaj   +1 more source

Element Nucleosynthetic Origins from Abundance Spatial Distributions beyond the Milky Way

The Astrophysical Journal Letters
An element’s astrophysical origin should be reflected in the spatial distribution of its abundance, yielding measurably different spatial distributions for elements with different nucleosynthetic sites.
Zefeng Li, Mark R. Krumholz, Anna F. McLeod, A. Mark Swinbank, Emily Wisnioski, J. Trevor Mendel, Francesco Belfiore, Giovanni Cresci, Giacomo Venturi, Jia-Lai Kang   +9 more
doaj   +1 more source

Galaxy and Mass Assembly (GAMA). The Properties of Quasar Host Galaxies: Star Formation Histories and Stellar Populations

The Astrophysical Journal
We investigated the star formation history and stellar populations of a sample of 205 Type I quasar host galaxies (0.1 < z < 0.35) and compared them with normal (nonactive) galaxies of the same mass and redshift within the volume of the Galaxy and Mass ...
Maria B. Stone, Roberto De Propris, Clare Wethers, Jari Kotilainen, Nischal Acharya, Benne Holwerda, Andrew M. Hopkins, Kevin Pimbblet   +7 more
doaj   +1 more source

Globular Cluster Counts around 700 Nearby Galaxies

The Astrophysical Journal
Empirically, the total number (or total mass) of globular clusters (GCs) bound in a single galactic system correlates with the virial mass of the system. The form of this relation and its intrinsic scatter are potentially valuable constraints on theories
Minh Ngoc Le, Andrew P. Cooper
doaj   +1 more source

Kant and extragalactic revolution in astronomy

Theoria, Beograd, 2004
In this paper we briefly consider the role Kant's early philosophy, and notably his "island universes" hypothesis played in the history of astronomy. There are many reasons for this, including the coincidence of Kant's jubilee year with 80 years since Hubble's discovery (1924) of the extragalactic universe.
openaire   +1 more source

A Comprehensive Characterization of Galaxy-cool CGM Connections at z < 0.4 with DESI Year 1 Data

The Astrophysical Journal
We investigate the relationships between the cool circumgalactic medium (CGM), traced by Ca ii absorption lines, and galaxy properties at z  
Yu Voon Ng, Ting-Wen Lan, J. Xavier Prochaska, Amélie Saintonge, Yu-Ling Chang, Małgorzata Siudek, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, A. Dey, P. Doel, S. Ferraro, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, K. Honscheid, M. Ishak, S. Juneau, T. Kisner, A. Kremin, M. Landriau, L. Le Guillou, M. Manera, A. Meisner, R. Miquel, J. Moustakas, A. D. Myers, S. Nadathur, C. Poppett, I. Pérez-Ràfols, G. Rossi, E. Sanchez, D. Schlegel, M. Schubnell, H. Seo, J. Silber, G. Tarlé, B. A. Weaver, R. Zhou, H. Zou   +43 more
doaj   +1 more source

Simulating the WFXT sky

, 2010
We investigate the scientific impact of the Wide Field X-ray Telescope mission. We present simulated images and spectra of X-ray sources as observed from the three surveys planned for the nominal 5-year WFXT lifetime.
Bignamini, A., Borgani, S., Campana, S., Conconi, P., Gilli, R., Paolillo, M., Ptak, A., Rosati, P., Santos, J., Team, the WFXT, Tozzi, P., Yu, H.   +11 more
core  

Extragalactic Astronomy: From Pioneers to Big Science

, 2016
At the beginning of the XIX century one of the scientific issues driving the research of astronomers, like the Herschels, was to test if all the nebulæ can be resolved into stars. This research continued uninterruptedly for many years surveying the nebulæ in the Charles Messier’s “Catalogue des n´ebuleuse et des amas d’´etoiles” published in 1780 and ...
RAMPAZZO, ROBERTO, D'ONOFRIO, MAURO, ZAGGIA, SIMONE, Lattis, James M., Haynes, Martha P., Giovanelli, Riccardo, Karachentseva, Valentina, Longair, Malcolm S., Lindblad, Per Olof, Renzini, Alvio, de Carvalho, Reinaldo Ramos, Kaifu, Norio, Bland Hawthorn, Jonathan, Djorgovski, Stanislav George, Bianchi, Luciana, Calzetti, Daniela, Fabbiano, Giuseppina, Combes, Françoise, CHIOSI, CESARE, Sulentic, Jack W.   +19 more
openaire   +4 more sources

Are Radio Minihalos Confined by Cold Fronts in Galaxy Clusters? Minihalos and Large-scale Sloshing in A3444 and MS 1455.0+2232

The Astrophysical Journal
We present radio and X-ray studies of A3444 and MS1455.0+2232, two galaxy clusters with radio minihalos in their cool cores. A3444 is imaged using the Giant Metrewave Radio Telescope (GMRT) at 333, 607, and 1300 MHz and the Very Large Array at 1435 MHz ...
S. Giacintucci, T. Venturi, M. Markevitch, G. Brunetti, T. E. Clarke, R. Kale   +5 more
doaj   +1 more source