Search Publications
HerMES: dust attenuation and star formation activity in ultraviolet-selected samples from z∼ 4 to ∼ 1.5
Ilbert, O.; Béthermin, M.; Buat, V. +16 more
We study the link between observed ultraviolet (UV) luminosity, stellar mass and dust attenuation within rest-frame UV-selected samples at z ∼ 4, ∼ 3 and ∼1.5. We measure by stacking at 250, 350 and 500 µm in the Herschel/Spectral and Photometric Imaging Receiver images from the Herschel Multi-Tiered Extragalactic Survey (HerMES) program the…
The Peculiar Extinction Law of SN 2014J Measured with the Hubble Space Telescope
Kulkarni, S. R.; Nugent, P. E.; Amanullah, R. +10 more
The wavelength dependence of the extinction of Type Ia SN 2014J in the nearby galaxy M82 has been measured using UV to near-IR photometry obtained with the Hubble Space Telescope, the Nordic Optical Telescope, and the Mount Abu Infrared Telescope. This is the first time that the reddening of an SN Ia is characterized over the full wavelength range…
X-Ray Emission from Magnetic Massive Stars
Wade, Gregg A.; Nazé, Yaël; ud-Doula, Asif +4 more
Magnetically confined winds of early-type stars are expected to be sources of bright and hard X-rays. To clarify the systematics of the observed X-ray properties, we have analyzed a large series of Chandra and XMM-Newton observations, corresponding to all available exposures of known massive magnetic stars (over 100 exposures covering ~60% of star…
ALMA Observations of the Antennae Galaxies. I. A New Window on a Prototypical Merger
Whitmore, Bradley C.; Chandar, Rupali; Johnson, Kelsey +7 more
We present the highest spatial resolution (≈0.''5) CO (3-2) observations to date of the "overlap" region in the merging Antennae galaxies (NGC 4038/39), taken with the Atacama Large Millimeter/submillimeter Array. We report on the discovery of a long (3 kpc), thin (aspect ratio 30/1), filament of CO gas that breaks up into roughly 10 individual kn…
The Hawk-I UDS and GOODS Survey (HUGS): Survey design and deep K-band number counts
Wuyts, S.; Daddi, E.; Chary, R. -R. +40 more
We present the results of a new, ultra-deep, near-infrared imaging survey executed with the Hawk-I imager at the ESO VLT, of which we make all the data (images and catalog) public. This survey, named HUGS (Hawk-I UDS and GOODS Survey), provides deep, high-quality imaging in the K and Y bands over the portions of the UKIDSS UDS and GOODS-South fiel…
ALMA Observation of 158 µm [C II] Line and Dust Continuum of a z = 7 Normally Star-forming Galaxy in the Epoch of Reionization
Jiang, Linhua; Neri, Roberto; Walter, Fabian +16 more
We present ALMA observations of the [C II] line and far-infrared (FIR) continuum of a normally star-forming galaxy in the reionization epoch, the z = 6.96 Lyα emitter (LAE) IOK-1. Probing to sensitivities of σline = 240 µJy beam-1 (40 km s-1 channel) and σcont = 21 µJy beam-1, we f…
Deciphering the Atmospheric Composition of WASP-12b: A Comprehensive Analysis of its Dayside Emission
Madhusudhan, Nikku; Stevenson, Kevin B.; Bean, Jacob L. +1 more
WASP-12b was the first planet reported to have a carbon-to-oxygen ratio (C/O) greater than one in its dayside atmosphere. However, recent work to further characterize its atmosphere and confirm its composition has led to incompatible measurements and divergent conclusions. Additionally, the recent discovery of stellar binary companions ~1'' from W…
Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61
Hiraga, J. S.; Enoto, T.; Murakami, H. +5 more
Magnetars are a special type of neutron stars, considered to have extreme dipole magnetic fields reaching ∼1011 T. The magnetar 4U 0142+61, one of the prototypes of this class, was studied in broadband x rays (0.5-70 keV) with the Suzaku observatory. In hard x rays (15-40 keV), its 8.69 sec pulsations suffered slow phase modulations by …
Standard big bang nucleosynthesis and primordial CNO abundances after Planck
Uzan, Jean-Philippe; Coc, Alain; Vangioni, Elisabeth
Primordial or big bang nucleosynthesis (BBN) is one of the three historical strong evidences for the big bang model. The recent results by the Planck satellite mission have slightly changed the estimate of the baryonic density compared to the previous WMAP analysis. This article updates the BBN predictions for the light elements using the cosmolog…
The spin temperature of high-redshift damped Lyman α systems
Momjian, E.; Ryan-Weber, E. V.; de Bruyn, A. G. +10 more
We report results from a programme aimed at investigating the temperature of neutral gas in high-redshift damped Lyman α absorbers (DLAs). This involved (1) H I 21 cm absorption studies of a large sample of DLAs towards radio-loud quasars, (2) very long baseline interferometric studies to measure the low-frequency quasar core fractions, and (3) op…