Search Publications
NGC 1277: A Massive Compact Relic Galaxy in the Nearby Universe
Vazdekis, Alexandre; Trujillo, Ignacio; Balcells, Marc +2 more
As early as 10 Gyr ago, galaxies with more than 1011 M ⊙ of stars already existed. While most of these massive galaxies must have subsequently transformed through on-going star formation and mergers with other galaxies, a small fraction (lsim0.1%) may have survived untouched until today. Searches for such relic galaxies, usef…
The Luminosity Function at z ~ 8 from 97 Y-band Dropouts: Inferences about Reionization
Holwerda, Benne W.; Stiavelli, Massimo; Schmidt, Kasper B. +6 more
We present the largest search to date for Y-band dropout galaxies (z ~ 8 Lyman break galaxies, LBGs) based on 350 arcmin2 of Hubble Space Telescope observations in the V, Y, J, and H bands from the Brightest of Reionizing Galaxies (BoRG) survey. In addition to previously published data, the BoRG13 data set presented here includes approx…
The 2-79 keV X-Ray Spectrum of the Circinus Galaxy with NuSTAR, XMM-Newton, and Chandra: A Fully Compton-thick Active Galactic Nucleus
Harrison, F. A.; Stern, D.; Zhang, W. W. +24 more
The Circinus galaxy is one of the closest obscured active galactic nuclei (AGNs), making it an ideal target for detailed study. Combining archival Chandra and XMM-Newton data with new NuSTAR observations, we model the 2-79 keV spectrum to constrain the primary AGN continuum and to derive physical parameters for the obscuring material. Chandra's hi…
The Progenitors of the Compact Early-type Galaxies at High Redshift
Barro, Guillermo; Bell, Eric F.; Ferguson, Henry C. +19 more
We use GOODS and CANDELS images to identify progenitors of massive (M > 1010 M ⊙) compact early-type galaxies (ETGs) at z ~ 1.6. Because merging and accretion increase the size of the stellar component of galaxies, if the progenitors are among known star-forming galaxies, these must be compact themselves. We select candida…
The Identification of Filaments on Far-infrared and Submillimiter Images: Morphology, Physical Conditions and Relation with Star Formation of Filamentary Structure
Paladini, R.; Moore, T. J. T.; Rygl, K. L. J. +12 more
Observations of molecular clouds reveal a complex structure, with gas and dust often arranged in filamentary, rather than spherical geometries. The association of pre- and proto-stellar cores with the filaments suggests a direct link with the process of star formation. Any study of the properties of such filaments requires representative samples f…
The Rise of SN 2014J in the Nearby Galaxy M82
Cenko, S. B.; Sollerman, J.; Bloom, J. S. +31 more
We report on the discovery of SN 2014J in the nearby galaxy M82. Given its proximity, it offers the best opportunity to date to study a thermonuclear supernova (SN) over a wide range of the electromagnetic spectrum. Optical, near-IR, and mid-IR observations on the rising light curve, orchestrated by the intermediate Palomar Transient Factory, show…
Dense Cores in Galaxies Out to z = 2.5 in SDSS, UltraVISTA, and the Five 3D-HST/CANDELS Fields
van Dokkum, Pieter G.; Muzzin, Adam; Labbé, Ivo +15 more
The dense interiors of massive galaxies are among the most intriguing environments in the universe. In this paper,we ask when these dense cores were formed and determine how galaxies gradually assembled around them. We select galaxies that have a stellar mass >3 × 1010 M ⊙ inside r = 1 kpc out to z = 2.5, using the 3D-HST …
Brown Dwarf Photospheres are Patchy: A Hubble Space Telescope Near-infrared Spectroscopic Survey Finds Frequent Low-level Variability
Apai, Dániel; Radigan, Jacqueline; Buenzli, Esther +2 more
Condensate clouds strongly impact the spectra of brown dwarfs and exoplanets. Recent discoveries of variable L/T transition dwarfs argued for patchy clouds in at least some ultracool atmospheres. This study aims to measure the frequency and level of spectral variability in brown dwarfs and to search for correlations with spectral type. We used Hub…
Radial Dependence of the Frequency Break between Fluid and Kinetic Scales in the Solar Wind Fluctuations
Bruno, R.; Trenchi, L.
We investigate the radial dependence of the spectral break separating the inertial from the dissipation range in power density spectra of interplanetary magnetic field fluctuations, between 0.42 and 5.3 AU, during radial alignments between MESSENGER and WIND for the inner heliosphere and between WIND and ULYSSES for the outer heliosphere. We found…
The Nature of Extreme Emission Line Galaxies at z = 1-2: Kinematics and Metallicities from Near-infrared Spectroscopy
Bell, Eric F.; Ferguson, Henry C.; Koekemoer, Anton M. +21 more
We present near-infrared spectroscopy of a sample of 22 Extreme Emission Line Galaxies at redshifts 1.3 < z < 2.3, confirming that these are low-mass (M sstarf = 108-109 M ⊙) galaxies undergoing intense starburst episodes (M sstarf/SFR ~ 10-100 Myr). The sample is selected by [O III] or …