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Extreme Star Formation in the Host Galaxies of the Fastest Growing Supermassive Black Holes at z = 4.8
Trakhtenbrot, Benny; Netzer, Hagai; Shemmer, Ohad +2 more
We report new Herschel observations of 25 z ~= 4.8 extremely luminous optically selected active galactic nuclei (AGNs). Five of the sources have extremely large star-forming (SF) luminosities, L SF, corresponding to SF rates (SFRs) of 2800-5600 M ⊙ yr-1 assuming a Salpeter initial mass function. The remaining sourc…
Modeling the evolution of infrared galaxies: clustering of galaxies in the cosmic infrared background
Doré, O.; Lagache, G.; Béthermin, M. +1 more
Context. Star-forming galaxies are highly biased tracers of the underlying dark matter density field. Their clustering can be studied through the cosmic infrared background (CIB) anisotropies. These anisotropies have been measured from 100 µm to 2 mm in the past few years.
Aims: In this paper, we present a fully parametric model allowin…
CXOM31 J004253.1+411422: the first ultraluminous X-ray transient in M 31
Pietsch, W.; Haberl, F.; Greiner, J. +6 more
Context. We seek clarification of the nature of X-ray sources detected in M 31. Here we focus on CXOM31 J004253.1+411422, the brightness of which suggests that it belongs to the class of ultraluminous X-ray sources.
Aims: We determine the X-ray properties of sources detected in the XMM-Newton/Chandra monitoring program. We investigate spectra…
9 Sagittarii: uncovering an O-type spectroscopic binary with an 8.6 year period
Gosset, E.; Rauw, G.; De Becker, M. +4 more
Context. The O-type object 9 Sgr is a well-known synchrotron radio emitter. This feature is usually attributed to colliding-wind binary systems, but 9 Sgr was long considered a single star.
Aims: We have conducted a long-term spectroscopic monitoring of this star to investigate its multiplicity and search for evidence for wind-wind interactio…
Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1
Berta, S.; Magnelli, B.; Lutz, D. +22 more
The infrared (IR) emission of "M * galaxies" (1010.4 <= M star <= 1011.0 M ⊙) in galaxy pairs, derived using data obtained in Herschel (PEP/HerMES) and Spitzer (S-COSMOS) surveys, is compared to that of single-disk galaxies in well-matched control samples to study the cosmic evolution of…
Thirty Years of SN 1980K: Evidence for Light Echoes
Barlow, Michael J.; Meixner, Margaret; Clayton, Geoffrey C. +7 more
We report optical and mid-infrared photometry of SN 1980K between 2004 and 2010, which shows slow monotonic fading consistent with previous spectroscopic and photometric observations made 8-17 yr after outburst. The slow rate of change over two decades suggests that this evolution may result from scattered and thermal light echoes off of extended …
The Latitude Distribution of Small-scale Magnetic Elements in Solar Cycle 23
Wang, J. X.; Jin, C. L.
With the unique data set from full-disk observations provided by Michelson Doppler Imager on board the Solar and Heliospheric Observatory in the interval embodying solar cycle 23, we have found that the cyclic variations of numbers and total flux of these small-scale magnetic elements covering fluxes of (2.9-32.0) × 1018 Mx and (4.27-38…
Recovery of the Historical SN1957D in X-Rays with Chandra
Soria, Roberto; Blair, William P.; Whitmore, Bradley C. +6 more
SN1957D, located in one of the spiral arms of M83, is one of the small number of extragalactic supernovae (SNe) that has remained detectable at radio and optical wavelengths during the decades after its explosion. Here, we report the first detection of SN1957D in X-rays, as part of a 729 ks observation of M83 with Chandra. The X-ray luminosity (0.…
The dark matter distribution in z ~ 0.5 clusters of galaxies. I. Determining scaling relations with weak lensing masses
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +3 more
The total mass of clusters of galaxies is a key parameter for studing massive halos. It relates to numerous gravitational and baryonic processes at play in the framework of large-scale structure formation, thus rendering its determination both important and challenging. From a sample of the 11 X-ray bright clusters selected from the EXCPRES sample…
The Truncated Disk from Suzaku Data of GX 339-4 in the Extreme Very High State
Done, Chris; Ueda, Yoshihiro; Kubota, Aya +4 more
We report on the geometry of accretion disk and high-energy coronae in the strong Comptonization state (the very high/steep power law/hard intermediate state) based on a Suzaku observation of the famous Galactic black hole GX 339-4. These data were taken just before the peak of the 2006-2007 outburst, and the average X-ray luminosity in the 0.7-20…