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The nature of the HE0450-2958 system
Robinson, Andrew; Storchi-Bergmann, Thaisa; Merritt, David +3 more
Magain et al. argued that the host galaxy of the quasar in HE0450-2958 is substantially underluminous given the quasar brightness. Using kinematical information from the spectra of the quasar and the companion galaxy, an ultraluminous infrared galaxy, we test the hypothesis that the black hole powering the quasar was ejected from the companion gal…
Near-Infrared and the Inner Regions of Protoplanetary Disks
Ivezić, Željko; Jurkić, Tomislav; Vinković, Dejan +1 more
We examine the ``puffed-up inner disk'' model proposed by Dullemond, Dominik, & Natta for explaining the near-IR excess radiation from Herbig Ae/Be stars. Detailed model computations show that the observed near-IR excess requires more hot dust than is contained in the puffed-up disk rim. The rim can produce the observed near-IR excess only if …
Optical and X-Ray Identification of Faint Radio Sources in the GOODS CDF-S Advanced Camera for Surveys Field
Koekemoer, A.; Mobasher, B.; Norris, R. P. +2 more
We present optical and X-ray identifications for the 64 radio sources in the Great Observatories Origins Deep Survey Chandra Deep Field-South Advanced Camera for Surveys (ACS) field revealed in the Australia Telescope Compact Array 1.4 GHz survey of the Chandra Deep Field-South. Optical identifications are made using the ACS images and catalogs, w…
A hard X-ray view of giga-hertz peaked spectrum radio galaxies
Guainazzi, M.; Piconcelli, E.; Grandi, P. +3 more
We present the first broadband X-ray observations of four Giga-Hertz Peaked Spectrum (GPS) radio galaxies at redshift ⪉1 performed by Chandra and XMM-Newton. These observations more than double the number of members of this class with measured spectra in hard (E > 2 keV) X-rays. All sources were detected. Their radio-to-X-ray spectral energy di…
Shapley Optical Survey - II. The effect of environment on the colour-magnitude relation and galaxy colours
Mercurio, A.; Capaccioli, M.; Gargiulo, A. +5 more
We present an analysis of the effects of environment on the photometric properties of galaxies in the core of the Shapley supercluster at z = 0.05, one of the most massive structures in the local universe. The Shapley Optical Survey (SOS) comprises archive Wide Field Imager (WFI) optical imaging of a 2.0deg2 region containing the rich c…
Relativistic blue- and red-shifted absorption lines in AGNs
Cappi, M.
Current, accumulating evidence for (mildly) relativistic blue- and red-shifted absorption lines in AGNs is reviewed. XMM-Newton and Chandra sensitive X-ray observations are starting to probe not only the kinematics (velocity) but also the dynamics (accelerations) of highly ionized gas flowing in-and-out from, likely, a few gravitational radii from…
Mars water vapor abundance from SPICAM IR spectrometer: Seasonal and geographic distributions
Bertaux, Jean-Loup; Korablev, Oleg; Fedorova, Anna +3 more
The near-IR channel of SPICAM experiment on Mars Express spacecraft is a 800-g acousto-optic tunable filter (AOTF)-based spectrometer operating in the spectral range of 1-1.7 µm with resolving power of ~2000. It was put aboard as an auxiliary channel dedicated to nadir H2O measurements in the 1.37-µm spectral band. This prim…
Spitzer Space Telescope IRAC and MIPS Observations of the Interacting Galaxies IC 2163 and NGC 2207: Clumpy Emission
Brinks, Elias; Struck, Curtis; Elmegreen, Bruce G. +4 more
IC 2163 and NGC 2207 are interacting galaxies that have been well studied at optical and radio wavelengths and simulated in numerical models to reproduce the observed kinematics and morphological features. Spitzer IRAC and MIPS observations reported here show over 200 bright clumps from young star complexes. The brightest IR clump is a morphologic…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. IV. A study of six new hard X-ray sources
Palazzi, E.; Masetti, N.; Walter, R. +9 more
We present further results from our onging optical spectrophotometric campaign at the Astronomical Observatory of Bologna in Loiano (Italy) on unidentified hard X-ray sources detected by INTEGRAL. We observed spectroscopically the putative optical counterparts of the INTEGRAL sources IGR J00234+6141, IGR J01583+6713, IGR J06074+2205, IGR J13091+11…
A fossil galaxy cluster: an X-ray and optical study of RX J1416.4+2315
Ponman, Trevor J.; Khosroshahi, Habib G.; Maughan, Ben J. +1 more
We present a detailed X-ray and optical study of a distant fossil system RX J1416.4+2315(z ~ 0.137), combining Chandra and XMM-Newton observations, optical photometry and spectroscopy. X-ray emitting hot gas imaged by both the Chandra and XMM-Newton shows a globally relaxed spatial distribution, supporting the idea that fossil groups are old galax…