Search Publications
Time Delays in Quasi-periodic Pulsations Observed during the X2.2 Solar Flare on 2011 February 15
Schmutz, W.; Zhukov, A. N.; Berghmans, D. +10 more
We report observations of quasi-periodic pulsations (QPPs) during the X2.2 flare of 2011 February 15, observed simultaneously in several wavebands. We focus on fluctuations on timescale 1-30 s and find different time lags between different wavebands. During the impulsive phase, the Reuven Ramaty High Energy Solar Spectroscopic Imager channels in t…
Ground-based Near-infrared Emission Spectroscopy of HD 189733b
Drossart, P.; Waldmann, I. P.; Tinetti, G. +3 more
We investigate the K- and L-band dayside emission of the hot-Jupiter HD 189733b with three nights of secondary eclipse data obtained with the SpeX instrument on the NASA Infrared Telescope Facility. The observations for each of these three nights use equivalent instrument settings and the data from one of the nights have previously been reported b…
The Star Formation History of Leo T from Hubble Space Telescope Imaging
Bell, Eric F.; Dolphin, Andrew E.; Williams, Benjamin F. +9 more
We present the star formation history (SFH) of the faintest known star-forming galaxy, Leo T, based on deep imaging taken with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2). The HST/WFPC2 color-magnitude diagram (CMD) of Leo T is exquisitely deep, extending ~2 mag below the oldest main-sequence turnoff, permitting excellen…
The First Observations of Low-redshift Damped Lyα Systems with the Cosmic Origins Spectrograph: Chemical Abundances and Affiliated Galaxies
Lehner, N.; Jenkins, E. B.; Prochaska, J. X. +6 more
We present Cosmic Origins Spectrograph (COS) measurements of metal abundances in eight 0.083 < z abs < 0.321 damped Lyα (DLA) and sub-DLA absorption systems serendipitously discovered in the COS-Halos survey. We find that these systems show a large range in metallicities, with -1.10 < [Z/H] < 0.31, similar to the spread foun…
A Spitzer MIPS Study of 2.5-2.0 M ⊙ Stars in Scorpius-Centaurus
Chen, Christine H.; Mamajek, Eric E.; Su, Kate Y. L. +2 more
We have obtained Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) 24 µm and 70 µm observations of 215 nearby, Hipparcos B- and A-type common proper-motion single and binary systems in the nearest OB association, Scorpius-Centaurus. Combining our MIPS observations with those of other ScoCen stars in the literature…
Chandra High-resolution observations of CID-42, a Candidate Recoiling Supermassive Black Hole
Salvato, M.; Vignali, C.; Gilli, R. +15 more
We present Chandra High Resolution Camera observations of CID-42, a candidate recoiling supermassive black hole (SMBH) at z = 0.359 in the COSMOS survey. CID-42 shows two optical compact sources resolved in the HST/ACS image embedded in the same galaxy structure and a velocity offset of ~1300 km s-1 between the Hβ broad and narrow emiss…
Automatic Detection and Tracking of Coronal Mass Ejections. II. Multiscale Filtering of Coronagraph Images
Morgan, Huw; Gallagher, Peter T.; Habbal, Shadia R. +1 more
Studying coronal mass ejections (CMEs) in coronagraph data can be challenging due to their diffuse structure and transient nature, and user-specific biases may be introduced through visual inspection of the images. The large amount of data available from the Solar and Heliospheric Observatory (SOHO), Solar TErrestrial RElations Observatory (STEREO…
Spitzer- and Herschel-based Spectral Energy Distributions of 24 µm Bright z ~ 0.3-3.0 Starbursts and Obscured Quasars
Fadda, Dario; Yan, Lin; Sajina, Anna +2 more
In this paper, we characterize the infrared spectral energy distributions (SEDs) of mid-IR-selected z ~ 0.3-3.0 and L IR ~ 1011-1013 L ⊙ galaxies, and study how their SEDs differ from those of local and high-z analogs. Infrared SEDs depend both on the power source (AGN or star formation) and the dust dis…
Low-altitude Reconnection Inflow-Outflow Observations during a 2010 November 3 Solar Eruption
Reeves, Katharine K.; Savage, Sabrina L.; McKenzie, David E. +3 more
For a solar flare occurring on 2010 November 3, we present observations using several SDO/AIA extreme-ultraviolet (EUV) passbands of an erupting flux rope followed by inflows sweeping into a current sheet region. The inflows are soon followed by outflows appearing to originate from near the termination point of the inflowing motion—an observation …
Source-plane Reconstruction of the Bright Lensed Galaxy RCSGA 032727-132609
Rigby, Jane R.; Barrientos, L. Felipe; Sharon, Keren +4 more
We present new Hubble Space Telescope/Wide Field Camera 3 imaging data of RCSGA 032727-132609, a bright lensed galaxy at z = 1.7 that is magnified and stretched by the lensing cluster RCS2 032727-132623. Using this new high-resolution imaging, we modify our previous lens model (which was based on ground-based data) to fully understand the lensing …