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Rest-frame optical emission line diagnostics are often used to help classify ionizing sources within galaxies. However, rest-frame optical tracers can miss sources with high dust attenuation, leading to misclassification of the dominant…

Astrophysics of Galaxies · Physics 2025-11-13 Si-Rui Ge , Nikko J. Cleri , Joel Leja , Antonello Calabro , Vital Fernandez

We combine the Herschel Space Observatory PACS and SPIRE photometry with archival WISE photometry to construct the spectral energy distributions (SED) for over 300 local ($z < 0.05$), ultra-hard X-ray (14 - 195 keV) selected active galactic…

Astrophysics of Galaxies · Physics 2017-02-01 T. Taro Shimizu , Richard F. Mushotzky , Marcio Meléndez , Michael J. Koss , Amy J. Barger , Lennox L. Cowie

We fit the near-infrared to radio spectral energy distributions of a sample of 30 luminous and ultra-luminous infrared galaxies with models that include both starburst and AGN components. The aim of the work was to determine important…

Astrophysics of Galaxies · Physics 2009-02-10 O. Vega , M. S. Clemens , A. Bressan , G. L. Granato , L. Silva , P. Panuzzo

We cross-correlate the largest available Mid-Infrared (WISE), X-ray (3XMM) and Radio (FIRST+NVSS) catalogues to define the MIXR sample of AGN and star-forming galaxies. We pre-classify the sources based on their positions on the WISE…

Astrophysics of Galaxies · Physics 2016-08-01 B. Mingo , M. G. Watson , S. R. Rosen , M. J. Hardcastle , A. Ruiz , A. Blain , F. J. Carrera , S. Mateos , F. X. Pineau , G. C. Stewart

Photometric data of galaxies covering the rest-frame wavelength range from far-UV to far-IR make it possible to derive galaxy properties with a high reliability by fitting the attenuated stellar emission and the related dust emission at the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 S. Noll , D. Burgarella , E. Giovannoli , V. Buat , D. Marcillac , J. C. Munoz-Mateos

We describe new efforts to model radio active galactic nuclei (AGN) in a cosmological context using the SAGE semi-analytic galaxy model. Our new method tracks the physical properties of radio jets in massive galaxies, including the…

Astrophysics of Galaxies · Physics 2017-08-09 Mojtaba Raouf , Stanislav S. Shabala , Darren J. Croton , Habib G. Khosroshahi , Maksym Bernyk

We present a multi-wavelength analysis of the properties of Extremely Red Galaxy (ERG) populations, selected in the GOODS-South/Chandra Deep Field South field. By using all the photometric and spectroscopic information available on large…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Hugo Messias , Jose Afonso , Andrew Hopkins , Bahram Mobasher , Tania Dominici , David M. Alexander

We present a comparison of theoretical predictions of dust continuum and polycyclic aromatic hydrocarbon (PAH) emission with new JWST observations in three nearby galaxies: NGC 628, NGC 1365, and NGC 7496. Our analysis focuses on a total of…

We analyzed HST images of 31 nearby (z <~ 0.1) 3CR radio-galaxies. We compared their UV and optical images to detect evidence of recent star formation. Six objects were excluded because they are highly nucleated or had very low UV count…

Astrophysics · Physics 2009-11-13 Ranieri D. Baldi , Alessandro Capetti

The current deepest radio surveys detect hundreds of sources per square degree below 0.1mJy. There is a growing consensus that a large fraction of these sources are dominated by star formation although the exact proportion has been debated…

Cosmology and Nongalactic Astrophysics · Physics 2009-11-25 Nick Seymour

The James Webb Space Telescope (JWST) will enable the detection of optical emission lines in galaxies spanning a broad range of luminosities out to redshifts z>10. Measurements of key galaxy properties, such as star formation rate and…

The relationship between star formation and super-massive black hole growth is central to our understanding of galaxy formation and evolution. Hyper-Luminous Infrared Galaxies (HLIRGs) are unique laboratories to investigate the connection…

Cosmology and Nongalactic Astrophysics · Physics 2010-06-16 A. Ruiz , G. Miniutti , F. Panessa , F. J. Carrera

Telescopes like Herschel and the Atacama Large Millimeter/submillimeter Array (ALMA) are creating new opportunities to study sources in the far infrared (FIR), a wavelength region dominated by cold dust emission. Probing cold dust in active…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Aden R. Draper , David R. Ballantyne

We use deep Herschel observations of the complete 2Jy sample of powerful radio AGNs in the local universe (0.05 < z < 0.7) to probe their cool interstellar medium (ISM) contents and star-forming properties, comparing them against other…

Astrophysics of Galaxies · Physics 2022-03-02 E. Bernhard , C. N. Tadhunter , J. C. S. Pierce , D. Dicken , R. Morganti , C. Ramos Almeida , E. Daddi

Updates are provided on several issues related to Unified Models. A new HST spectrum of Cygnus A confirms the broad MgII emission line, and suggests a very large velocity width as seen in the polarized optical lines. Statistics of the 3CR…

Astrophysics · Physics 2007-05-23 Robert Antonucci

Differentiating between active galactic nuclei (AGN) activity and star formation in z ~ 2 galaxies is difficult because traditional methods, such as line ratio diagnostics, change with redshift while multi-wavelength methods (X-ray, radio,…

We present a new numerical code which is designed to derive a spectral energy distribution (SED) for an arbitrary spatial distribution of stellar and gaseous components in a dusty starburst galaxy. We apply a ray tracing method to numerical…

Astrophysics · Physics 2009-10-31 Kenji Bekki , Yasuhiro Shioya

By combining the 2-degree Field Galaxy Redshift Survey with the NRAO VLA Sky Survey at 1.4 GHz, the environments of radio loud AGN in the nearby Universe are investigated using both local projected galaxy densities and a friends-of-friends…

Astrophysics · Physics 2009-11-10 P. N. Best

The uncertainty surrounding the nature of the heating mechanism for the dust that emits at mid- to far-IR (MFIR) wavelengths in active galaxies limits our understanding of the links between active galactic nuclei (AGN) and galaxy evolution,…

In order to examine the far-IR/radio correlation at high redshift we have studied the Spitzer 70um/far-infrared (far-IR) properties of sub-mJy radio sources from the 13^H XMM-Newton/Chandra Deep Field by redshift and galaxy type: active…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 N. Seymour , M. Huynh , T. Dwelly , M. Symeonidis , A. Hopkins , I. M. McHardy , M. Page , G. Rieke