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The Star Formation Rate Efficiency of Neutral Atomic-dominated Hydrogen Gas in the Outskirts of Star-forming Galaxies from z ~ 1 to z ~3
Koekemoer, Anton M.; Gardner, Jonathan P.; Teplitz, Harry I. +5 more
Current observational evidence suggests that the star formation rate (SFR) efficiency of neutral atomic hydrogen gas measured in damped Lyα systems (DLAs) at z∼ 3 is more than 10 times lower than predicted by the Kennicutt-Schmidt (KS) relation. To understand the origin of this deficit, and to investigate possible evolution with redshift and galax…
Enhancement of a Sunspot Light Wall with External Disturbances
Yang, Shuhong; Zhang, Jun; Erdélyi, Robert
Based on the Interface Region Imaging Spectrograph observations, we study the response of a solar sunspot light wall to external disturbances. A flare occurrence near the light wall caused material to erupt from the lower solar atmosphere into the corona. Some material falls back to the solar surface and hits the light bridge (I.e., the base of th…
First Detection of a Pulsar Bow Shock Nebula in Far-UV: PSR J0437-4715
Pavlov, George G.; Kargaltsev, Oleg; Rangelov, Blagoy +3 more
Pulsars traveling at supersonic speeds are often accompanied by cometary bow shocks seen in Hα. We report on the first detection of a pulsar bow shock in the far-ultraviolet (FUV). We detected it in FUV images of the nearest millisecond pulsar J0437-4715 obtained with the Hubble Space Telescope. The images reveal a bow-like structure positionally …
The X-ray light curve of the massive colliding wind Wolf-Rayet + O binary WR 21a
Nazé, Yaël; Gosset, Eric
Our dedicated XMM-Newton monitoring, as well as archival Chandra and Swift datasets, were used to examine the behaviour of the WN5h+O3V binary WR 21a at high energies. For most of the orbit, the X-ray emission exhibits few variations. However, an increase in strength of the emission is seen before periastron, following a 1 /D relative trend, where…
Millimeter and submillimeter excess emission in M 33 revealed by Planck and LABOCA
Boquien, M.; Kramer, C.; Relaño, M. +6 more
Context. Previous studies have shown the existence of an excess of emission at submillimeter (submm) and millimeter (mm) wavelengths in the spectral energy distribution (SED) of many low-metallicity galaxies. The so-called "submm excess", whose origin remains unknown, challenges our understanding of the dust properties in low-metallicity environme…
H II Region Ionization of the Interstellar Medium: A Case Study of NGC 7538
Anderson, L. D.; Bania, T. M.; Balser, Dana S. +2 more
Using data from the Green Bank Telescope, we analyze the radio continuum (free-free) and radio recombination line (RRL) emission of the compact H II region NGC 7538 (Sharpless 158). We detect extended radio continuum and hydrogen RRL emission beyond the photodissociation region (PDR) toward the north and east, but a sharp decrease in emission towa…
Cross-correlation between X-Ray and Optical/Near-infrared Background Intensity Fluctuations
Luo, Bin; Xue, Yongquan; Koekemoer, Anton +3 more
Angular power spectra of optical and infrared background anisotropies at wavelengths between 0.5 and 5 µm are a useful probe of faint sources present during reionization, in addition to faint galaxies and diffuse signals at low redshift. The cross-correlation of these fluctuations with backgrounds at other wavelengths can be used to separate…
Relativistic Fe Kα line study in Seyfert 1 galaxies observed with Suzaku
Nandra, K.; Ponti, G.; Mantovani, G.
We present an analysis of a sample of Seyfert 1 galaxies observed with Suzaku. The aim of this work is to examine critically the evidence for a relativistic Fe Kα line in the X-ray spectra of these active galactic nuclei. The sample was compiled from those sources in which a relativistic component was missing in at least one XMM-Newton observation…
The SOPHIE search for northern extrasolar planets. XI. Three new companions and an orbit update: Giant planets in the habitable zone
Bouchy, F.; Deleuil, M.; Moutou, C. +25 more
We report the discovery of three new substellar companions to solar-type stars, HD 191806, HD 214823, and HD 221585, based on radial velocity measurements obtained at the Haute-Provence Observatory. Data from the SOPHIE spectrograph are combined with observations acquired with its predecessor, ELODIE, to detect and characterise the orbital paramet…
An alternative validation strategy for the Planck cluster catalogue and y-distortion maps
Khatri, Rishi
We present an all-sky map of the y-type distortion calculated from the full mission Planck High Frequency Instrument (HFI) data using the recently proposed approach to component separation, which is based on parametric model fitting and model selection. This simple model-selection approach enables us to distinguish between carbon monoxide (CO) lin…