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We study the 37 brightest radio sources in the Subaru/XMM-Newton Deep Field (SXDF). Using mid-IR (Spitzer MIPS 24 micron) data we expect to trace nuclear accretion activity, even if it is obscured at optical wavelengths, unless the…

Astrophysics · Physics 2010-11-11 Eleni Vardoulaki , Steve Rawlings , Chris Simpson

We present deep radio maps from the Very Large Array (VLA) for 16 sources detected in a sub-millimeter (submm) survey of the distant Universe. Our deep VLA 1.4-GHz maps allow us to identify radio counterparts or place stringent limits…

Astrophysics · Physics 2009-10-31 Ian Smail , R. J. Ivison , F. N. Owen , A. W. Blain , J. -P. Kneib

We have studied the radio and far-infrared (FIR) emission from 114 galaxies in the 7 nearest clusters (<100 Mpc) with prominent X-ray emission to investigate the impact of the cluster environment on the star formation and AGN activity in…

Astrophysics · Physics 2009-11-10 Naveen A. Reddy , Min S. Yun

We present a detailed analysis of 256 radio sources from our deep (flux density limit of 42 microJy at the field centre at 1.4 GHz) Chandra Deep Field South 1.4 and 5 GHz VLA survey. The radio population is studied by using a wealth of…

Astrophysics · Physics 2011-02-11 P. Padovani , V. Mainieri , P. Tozzi , K. I. Kellermann , E. B. Fomalont , N. Miller , P. Rosati , P. Shaver

We present a study of the radio continuum properties of two luminous/ultraluminous infrared galaxy samples: the OH megamaser (OHM) sample (74 objects) and the control sample (128 objects) without detected maser emission. We carried out…

Using a recently completed survey of faint (sub-mJy) radio sources, selected at 1.4 GHz, a dust-free estimate of the local star formation rate (SFR) is carried out. The sample is 50% complete to 0.2 mJy, with over 50% of the radio sources…

Astrophysics · Physics 2009-10-31 B. Mobasher , L. Cram , A. Georgakakis , A. Hopkins

In order to investigate the role of absorption in AGN with jets, we have studied the column density distribution of a hard X-ray selected sample of radio galaxies, derived from the INTEGRAL/IBIS and Swift/BAT AGN catalogues (~7-10% of the…

High Energy Astrophysical Phenomena · Physics 2016-07-27 F. Panessa , L. Bassani , R. Landi , A. Bazzano , D. Dallacasa , F. La Franca , A. Malizia , T. Venturi , P. Ubertini

We explore the connections between the infrared and X-ray properties of AGNs. Using the well constrained infrared SEDs of a sample of local (i.e., z < 0.1) sample of X-ray AGNs, we develop new diagnostics that exploit 24um and 70um flux…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 J. R. Mullaney , D. M. Alexander

In order to trace the instantaneous star formation rate at high redshift, and hence help understanding the relation between the different emission mechanisms related to star formation, we combine the recent 4 Ms Chandra X-ray data and the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 S. Vattakunnel , P. Tozzi , F. Matteucci , P. Padovani , N. Miller , M. Bonzini , V. Mainieri , M. Paolillo , L. Vincoletto , W. N. Brandt , B. Luo , K. I. Kellermann , Y. Q. Xue

The Combined NVSS-FIRST Galaxy (CoNFIG) survey was defined by selecting all sources with S_1.4GHz > 1.3Jy from the NRAO VLA Sky Survey (NVSS) in the north field of the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey. We carried…

Astrophysics · Physics 2009-04-14 Melanie A. Gendre , Jasper V. Wall

We present physical properties of radio galaxies (RGs) with $f_{\rm 1.4 GHz} >$ 1 mJy discovered by Subaru Hyper Supreme-Cam (HSC) and VLA Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey. For 1056 FIRST RGs at $0 < z \leq…

We present a statistical study of the environments of 63 high-redshift radio galaxies (HzRGs) between redshifts 1<z<5.2, using the 24um, waveband of the MIPS instrument aboard the Spitzer Space Telescope. Using a counts-in-cell analysis, a…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Jack H. Mayo , Joel Vernet , Carlos De Breuck , Audrey Galametz , Nick Seymour , Daniel Stern

(Abrigded) Observations of galaxies up to z 2 show a tight correlation between far-infrared and radio continuum emission. We explain the far-infrared - radio continuum correlation by relating star formation and magnetic field strength in…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-16 Dominik R. G. Schleicher , Rainer Beck

Infrared-faint radio sources (IFRSs) are believed to be a rare class of radio-loud active galactic nuclei (RL AGN) characterized by their high radio-to-infrared flux density ratios of up to several thousands. Previous studies have shown…

Astrophysics of Galaxies · Physics 2025-02-11 Yihang Zhang , Lulu Fan , Tao An , Jun Yang , Weibin Sun , Haoran Yu , Yunkun Han

We extend the Unified Radio Catalog, a catalog of sources detected by various (NVSS, FIRST, WENSS, GB6) radio surveys, and SDSS, to IR wavelengths by matching it to the IRAS Point and Faint Source catalogs. By fitting each NVSS-selected…

Astrophysics of Galaxies · Physics 2015-05-20 Igor Moric , Vernesa Smolcic , Amy Kimball , Dominik A. Riechers , Zeljko Ivezic , Nick Scoville

Co-addition of deep (rms about 30 microJy) 20 cm data obtained with the Australia Telescope Compact Array at the location of Spitzer Wide field survey (SWIRE) sources has yielded statistics of radio source counterparts to faint 24 micron…

Astrophysics · Physics 2008-11-26 B. J. Boyle , T. J. Cornwell , E. Middelberg , R. P. Norris , P. N. Appleton , Ian Smail

We present deep {\it Spitzer} mid-infrared spectroscopy, along with 16, 24, 70, and 850\,$\micron$\ photometry, for 22 galaxies located in the Great Observatories Origins Deep Survey-North (GOODS-N) field. The sample spans a redshift range…

Cosmology and Nongalactic Astrophysics · Physics 2010-05-06 E. J. Murphy , R. R. Chary , D. M. Alexander , M. Dickinson , B. Magnelli , G. Morrison , A. Pope , H. I. Teplitz

Showing 1.4 GHz flux densities in the range of a few to a few tens of mJy, infrared-faint radio sources (IFRS) are a type of galaxy characterised by faint or absent near-infrared counterparts and consequently extreme radio-to-infrared flux…

Astrophysics of Galaxies · Physics 2015-07-22 Andreas Herzog , Ray P. Norris , Enno Middelberg , Lee R. Spitler , Christian Leipski , Quentin A. Parker

We study the 36 brightest radio sources in the Subaru/XMM-Newton Deep Field SXDF). Using MIPS 24 micron data from Spitzer we expect to trace accretion activity, even if it is hidden at optical wavelengths, unless the obscuring column is…

Astrophysics · Physics 2007-05-23 Eleni Vardoulaki , Steve Rawlings , Chris Simpson

Using the Spitzer Space Telescope, we have obtained rest frame 9-16mu spectra of 11 quasars and 9 radio galaxies from the 3CRR catalog at redshifts 1.0<z<1.4. This complete flux-limited 178MHz-selected sample is unbiased with respect to…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 C. Leipski , M. Haas , S. P. Willner , M. L. N. Ashby , B. J. Wilkes , G. G. Fazio , R. Antonucci , P. Barthel , R. Chini , P. Ogle , R. Siebenmorgen , F. Heymann