Search Publications
Broadband X-Ray Spectra of the Ultraluminous X-Ray Source Holmberg IX X-1 Observed with NuSTAR, XMM-Newton, and Suzaku
Harrison, F. A.; Ptak, A.; Stern, D. +16 more
We present results from the coordinated broadband X-ray observations of the extreme ultraluminous X-ray source Holmberg IX X-1 performed by NuSTAR, XMM-Newton, and Suzaku in late 2012. These observations provide the first high-quality spectra of Holmberg IX X-1 above 10 keV to date, extending the X-ray coverage of this remarkable source up to ~30 …
NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE-selected Quasars at z ~ 2
Harrison, F. A.; Stern, D.; Zhang, W. W. +32 more
We report on a NuSTAR and XMM-Newton program that has observed a sample of three extremely luminous, heavily obscured WISE-selected active galactic nuclei (AGNs) at z ~ 2 across a broad X-ray band (0.1 - 79 keV). The parent sample, selected to be faint or undetected in the WISE 3.4 µm (W1) and 4.6 µm (W2) bands but bright at 12 µ…
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…
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…
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…
The Physical Conditions, Metallicity and Metal Abundance Ratios in a Highly Magnified Galaxy at z = 3.6252
Oguri, Masamune; Rigby, Jane R.; Florian, Michael +5 more
We present optical and near-IR imaging and spectroscopy of SGAS J105039.6+001730, a strongly lensed galaxy at z = 3.6252 magnified by >30×, and derive its physical properties. We measure a stellar mass of log(M */M ⊙) = 9.5 ± 0.35, star formation rates from [O II] λλ3727 and Hβ of 55 ± 25 and 84 ± 24 M ⊙ yr…
A Consistent Study of Metallicity Evolution at 0.8 < z < 2.6
van Dokkum, Pieter; Bender, Ralf; Tacchella, Sandro +33 more
We present the correlations between stellar mass, star formation rate (SFR), and the [N II]/Hα flux ratio as an indicator of gas-phase metallicity for a sample of 222 galaxies at 0.8 < z < 2.6 and log (M */M ⊙) = 9.0-11.5 from the LUCI, SINS/zC-SINF, and KMOS3D surveys. This sample provides a unique analysis …
Evidence for a Weak Wind from the Young Sun
Redfield, Seth; Wood, Brian E.; Müller, Hans-Reinhard +1 more
The early history of the solar wind has remained largely a mystery due to the difficulty of detecting winds around young stars that can serve as analogs for the young Sun. Here we report on the detection of a wind from the 500 Myr old solar analog π1 UMa (G1.5 V), using spectroscopic observations from the Hubble Space Telescope. We dete…
A Molecular Line Scan in the Hubble Deep Field North: Constraints on the CO Luminosity Function and the Cosmic H2 Density
Daddi, E.; Maiolino, R.; Menten, K. M. +19 more
We present direct constraints on the CO luminosity function at high redshift and the resulting cosmic evolution of the molecular gas density, \rho _H_2(z), based on a blind molecular line scan in the Hubble Deep Field North (HDF-N) using the IRAM Plateau de Bure Interferometer. Our line scan of the entire 3 mm window (79-115 GHz) covers a cosmic v…