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The Fluctuating Intergalactic Radiation Field at Redshifts z = 2.3-2.9 from He II and H I Absorption toward HE 2347-4342
Shull, J. Michael; Kriss, Gerard A.; Tumlinson, Jason +2 more
We provide an in-depth analysis of the He II and H I absorption in the intergalactic medium (IGM) at redshifts z=2.3-2.9 toward HE 2347-4342, using spectra from the Far Ultraviolet Spectroscopic Explorer and the Ultraviolet-Visual Echelle Spectrograph on the Very Large Telescope. Following up on our earlier study, we focus here on two major topics…
Indications of a Large Fraction of Spectroscopic Binaries among Nuclei of Planetary Nebulae
Bond, Howard E.; De Marco, Orsola; Harmer, Dianne +1 more
Previous work indicates that about 10% of planetary-nebula nuclei (PNNi) are photometrically variable short-period binaries with periods of hours to a few days. These systems have most likely descended from common-envelope (CE) interactions in initially much wider binaries. Population-synthesis studies suggest that these very close pairs could be …
Study of the properties and spectral energy distributions of the Herbig AeBe stars HD 34282 and HD 141569
Rauer, H.; Schneider, J.; Eiroa, C. +21 more
We present a study of the stellar parameters, distances and spectral energy distributions (SEDs) of
Flux and energy modulation of redshifted iron emission in NGC 3516: implications for the black hole mass
Iwasawa, K.; Fabian, A. C.; Miniutti, G.
We report on the tentative detection of the modulation of a transient, redshifted Fe Kα emission feature in the X-ray spectrum of the Seyfert galaxy NGC 3516. The detection of the spectral feature at 6.1 keV, in addition to a stable 6.4-keV line, has been reported previously. We find, on reanalysing the XMM-Newton data, that the feature varies sys…
Looking for Gravity-Mode Multiplets with the GOLF Experiment aboard SOHO
Kosovichev, A. G.; García, R. A.; Provost, J. +12 more
This paper is focused on the search for low-amplitude solar gravity modes between 150 and 400 µHz, corresponding to low-degree, low-order modes. It presents results based on an original strategy that looks for multiplets instead of single peaks, taking into consideration our knowledge of the solar interior from acoustic modes. Five years of …
Photometric Redshift of X-Ray Sources in the Chandra Deep Field-South
Wolf, C.; Zheng, W.; Gilli, R. +10 more
Based on the photometry of 10 near-ultraviolet, optical, and near-infrared bands of the Chandra Deep Field-South, we estimate the photometric redshifts for 342 X-ray sources, which constitute ~99% of all the detected X-ray sources in the field. The models of spectral energy distribution are based on galaxies and a combination of power-law continuu…
Tentative identification of urea and formamide in ISO-SWS infrared spectra of interstellar ices
Duvernay, F.; Chiavassa, T.; Dartois, E. +4 more
Laboratory experiments involving vacuum ultraviolet (VUV) irradiation of solid isocyanic acid (HNCO) at 10 K, followed by infrared spectroscopy (FTIR), are used to interpret the complex spectra associated with Interstellar Medium (ISM) dust grains, particularly the spectra associated with the icy phase observed toward dense molecular clouds. The c…
2-10 keV luminosity of high-mass binaries as a gauge of ongoing star-formation rate
Cappi, M.; Franceschini, A.; Braito, V. +4 more
Based on recent work on spectral decomposition of the emission of star-forming galaxies, we assess whether the integrated 2-10 keV emission from high-mass X-ray binaries (HMXBs), L2-10HMXB, can be used as a reliable estimator of ongoing star formation rate (SFR). Using a sample of 46 local (z ⪉ 0.1) star-forming galaxies, and…
The Nature of Faint 24 Micron Sources Seen in Spitzer Space Telescope Observations of ELAIS-N1
Elbaz, D.; Reach, W. T.; Chary, R. +7 more
The Spitzer Space Telescope has undertaken the deepest ever observations of the 24 µm sky in the European Large Area ISO Survey (ELAIS-N1) field, with the Multiband Imaging Photometer (MIPS) instrument, as part of GOODS Science Verification observations. We present completeness-corrected extragalactic source counts down to 24 µm flux d…
A sample of radio galaxies spanning three decades in radio luminosity - I. The host galaxy properties and black hole masses
Willott, Chris J.; Rawlings, Steve; Jarvis, Matt J. +5 more
The results of analysis of HST I-band imaging of a sample of 41 radio galaxies spanning three orders of magnitude in radio luminosity at redshift z~= 0.5 are presented. These results represent the first stage in a coordinated programme to study the connection between radio luminosity and host galaxy properties, black hole masses and cluster enviro…