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The Rest-frame UV-to-optical Colors and Spectral Energy Distributions of z ~ 4-7 Galaxies
Franx, Marijn; Labbé, Ivo; Bouwens, Rychard J. +4 more
We use the ultra-deep HUDF09 and the deep Early Release Science data from the HST WFC3/IR camera, along with the wide-area Spitzer/IRAC data from GOODS-S to derive spectral energy distributions (SEDs) of star-forming galaxies from the rest-frame UV to the optical over a wide luminosity range (M 1500 ~ -21 to M 1500 ~ -18) fro…
The Early Early Type: Discovery of a Passive Galaxy at z spec ~ 3
Cimatti, A.; Daddi, E.; Béthermin, M. +6 more
We present the discovery of a massive, quiescent galaxy at z = 2.99. We have obtained an Hubble Space Telescope WFC3 spectrum of this object and measured its redshift from the detection of a deep 4000 Å break consistent with an old population and a high metallicity. By stellar population modeling of both its grism spectrum and broadband photometry…
Nitrogen hydrides in interstellar gas. II. Analysis of Herschel/HIFI observations towards W49N and G10.6 - 0.4 (W31C)
Menten, K. M.; Godard, B.; Persson, C. M. +14 more
As a part of the Herschel key programme PRISMAS, we have used the Herschel/HIFI instrument to observe interstellar nitrogen hydrides along the sight-lines towards eight high-mass star-forming regions in order to elucidate the production pathways leading to nitrogen-bearing species in diffuse gas. Here, we report observations towards W49N of the NH…
Hinode/EIS Spectroscopic Validation of Very Hot Plasma Imaged with the Solar Dynamics Observatory in Non-flaring Active Region Cores
Testa, Paola; Reale, Fabio
We use coronal imaging observations with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), and Hinode/Extreme-ultraviolet Imaging Spectrometer (EIS) spectral data to explore the potential of narrowband EUV imaging data for diagnosing the presence of hot (T >~ 5 MK) coronal plasma in active regions. We analyze observations of tw…
The cosmological analysis of X-ray cluster surveys - II. Application of the CR-HR method to the XMM archive
Altieri, B.; Valtchanov, I.; Pierre, M. +5 more
We have processed 2774 high galactic observations from the XMM archive (as of 2010 May) and extracted a serendipitous catalogue of some 850 clusters of galaxies based on purely X-ray criteria, following the methodology developed for the XMM-Large-Scale Survey. Restricting the sample to the highest signal-to-noise ratio objects (347 clusters), we p…
Variability and Star Formation in Leo T, the Lowest Luminosity Star-forming Galaxy Known Today
Cignoni, Michele; Marconi, Marcella; Ripepi, Vincenzo +5 more
We present results from the first combined study of variable stars and star formation history (SFH) of the Milky Way "ultra-faint" dwarf (UFD) galaxy Leo T, based on F606W and F814W multi-epoch archive observations obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. We have detected 14 variable stars in the galaxy.…
Dust and gas power spectrum in M 33 (HERM33ES)
Boquien, M.; Braine, J.; Calzetti, D. +18 more
Power spectra of deprojected images of late-type galaxies in gas or dust emission are very useful diagnostics of the dynamics and stability of their interstellar medium. Previous studies have shown that the power spectra can be approximated as two power laws, a shallow one on large scales (larger than 500 pc) and a steeper one on small scales, wit…
Characterization of new hard X-ray cataclysmic variables
Mukai, K.; de Martino, D.; Masetti, N. +5 more
Aims: We aim at characterizing a sample of nine new hard X-ray selected cataclysmic variable (CVs), to unambiguously identify them as magnetic systems of the intermediate polar (IP) type.
Methods: We performed detailed timing and spectral analysis by using X-ray, and simultaneous UV and optical data collected by XMM-Newton, complemented …
Rapid Sunspot Rotation Associated with the X2.2 Flare on 2011 February 15
Yang, Jiayan; Hong, Junchao; Zheng, Ruisheng +3 more
We present observations of sunspot evolution associated with the first X-class flare of the present solar cycle 24, which occurred in AR 11158 on 2011 February 15. The active region consisted of four emerging bipoles that showed complicated sunspot motion. The preceding spot of a bipole underwent the fastest movement. It not only passed through th…
Nonthermal X-rays from low-energy cosmic rays: application to the 6.4 keV line emission from the Arches cluster region
Decourchelle, A.; Maurin, G.; Tatischeff, V.
Context. The iron Kα line at 6.4 keV provides a valuable spectral diagnostic in several fields of X-ray astronomy. The line often results from the reprocessing of external hard X-rays by a neutral or low-ionized medium, but it can also be excited by impacts of low-energy cosmic rays.
Aims: This paper aims to provide signatures allowing identi…