Search Publications
The Nature of Double-peaked [O III] Active Galactic Nuclei
Djorgovski, S. G.; Myers, Adam D.; Aldering, G. +4 more
Active galactic nuclei (AGNs) with double-peaked [O III] lines are suspected to be sub-kpc or kpc-scale binary AGNs. However, pure gas kinematics can produce the same double-peaked line profile in spatially integrated spectra. Here we combine integral-field spectroscopy and high-resolution imaging of 42 double-peaked [O III] AGNs from the Sloan Di…
Polarimetric Imaging of Large Cavity Structures in the Pre-transitional Protoplanetary Disk around PDS 70: Observations of the Disk
Kuzuhara, M.; Tamura, M.; Ishii, M. +52 more
We present high-resolution H-band polarized intensity (FWHM = 0farcs1: 14 AU) and L'-band imaging data (FWHM = 0farcs11: 15 AU) of the circumstellar disk around the weak-lined T Tauri star PDS 70 in Centaurus at a radial distance of 28 AU (0farcs2) up to 210 AU (1farcs5). In both images, a giant inner gap is clearly resolved for the first time, an…
IDCS J1426.5+3508: Discovery of a Massive, Infrared-selected Galaxy Cluster at z = 1.75
Dey, Arjun; Gonzalez, Anthony H.; Stanford, S. A. +6 more
We report the discovery of an IR-selected massive galaxy cluster in the IRAC Deep Cluster Survey (IDCS). We present new data from the Hubble Space Telescope and the W. M. Keck Observatory that spectroscopically confirm IDCS J1426.5+3508 at z = 1.75. Moreover, the cluster is detected in archival Chandra data as an extended X-ray source, comprising …
On the Detection of Ionizing Radiation Arising from Star-forming Galaxies at Redshift z ~ 3-4: Looking for Analogs of "Stellar Re-ionizers"
Castellano, Marco; Dickinson, Mark; Ferguson, Henry C. +15 more
We use the spatially resolved, multi-band photometry in the GOODS South field acquired by the CANDELS project to constrain the nature of candidate Lyman continuum (LyC) emitters at redshift z ~ 3.7 identified using ultradeep imaging below the Lyman limit (1σ limit of ≈30 AB in a 2'' diameter aperture). In 19 candidates out of a sample of 20 with f…
The Properties and Prevalence of Galactic Outflows at z ~ 1 in the Extended Groth Strip
Martin, Crystal L.; Shapley, Alice E.; Coil, Alison L. +5 more
We investigate galactic-scale outflowing winds in 72 star-forming galaxies at z ~ 1 in the Extended Groth Strip. Galaxies were selected from the DEEP2 survey and follow-up LRIS spectroscopy was obtained covering Si II, C IV, Fe II, Mg II, and Mg I lines in the rest-frame ultraviolet. Using Galaxy Evolution Explorer (GALEX), Hubble Space Telescope …
CANDELS Observations of the Structural Properties of Cluster Galaxies at z = 1.62
Wuyts, S.; Ferguson, H. C.; Finkelstein, S. L. +25 more
We discuss the structural and morphological properties of galaxies in a z = 1.62 proto-cluster using near-IR imaging data from Hubble Space Telescope Wide Field Camera 3 data of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). The cluster galaxies exhibit a clear color-morphology relation: galaxies with colors of quiescent s…
Not Dead Yet: Cool Circumgalactic Gas in the Halos of Early-type Galaxies
Tripp, Todd M.; Prochaska, J. Xavier; Sembach, Kenneth R. +10 more
We report new observations of circumgalactic gas in the halos of early-type galaxies (ETGs) obtained by the COS-Halos Survey with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. We find that detections of H I surrounding ETGs are typically as common and strong as around star-forming galaxies, implying that the total mass of ci…
Verifying Asteroseismically Determined Parameters of Kepler Stars Using Hipparcos Parallaxes: Self-consistent Stellar Properties and Distances
Christensen-Dalsgaard, J.; Weiss, A.; García, R. A. +24 more
Accurately determining the properties of stars is of prime importance for characterizing stellar populations in our Galaxy. The field of asteroseismology has been thought to be particularly successful in such an endeavor for stars in different evolutionary stages. However, to fully exploit its potential, robust methods for estimating stellar param…
The Initial Mass Function of the Orion Nebula Cluster across the H-burning Limit
Henning, T.; Robberto, M.; Da Rio, N. +2 more
We present a new census of the Orion Nebula Cluster over a large field of view (gsim 30' × 30'), significantly increasing the known population of stellar and substellar cluster members with precisely determined properties. We develop and exploit a technique to determine stellar effective temperatures from optical colors, nearly doubling the previo…
Chandra/HETGS Observations of the Brightest Flare Seen from Sgr A*
Miller, J. M.; Nowak, M. A.; Grosso, N. +10 more
Starting in 2012, we began an unprecedented observational program focused on the supermassive black hole in the center of our Galaxy, Sgr A*, utilizing the High Energy Transmission Grating Spectrometer (HETGS) instrument on the Chandra X-Ray Observatory. These observations will allow us to measure the quiescent X-ray spectra of Sgr A* for the firs…