Search Publications
The MOSDEF Survey: Optical Active Galactic Nucleus Diagnostics at z ~ 2.3
Siana, Brian; Shapley, Alice E.; Aird, James +7 more
We present results from the MOSFIRE Deep Evolution Field (MOSDEF) survey on rest-frame optical active galactic nucleus (AGN) identification and completeness at z ~ 2.3. With our sample of 50 galaxies and 10 X-ray and IR-selected AGNs with measured Hβ, [O III], Hα, and N II emission lines, we investigate the location of AGNs in the BPT, MEx (mass-e…
Measurements of Sub-degree B-mode Polarization in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data
Ade, P. A. R.; Chiang, H. C.; Hanson, D. +63 more
We present a measurement of the B-mode polarization power spectrum (the BB spectrum) from 100 {{deg}}2 of sky observed with SPTpol, a polarization-sensitive receiver currently installed on the South Pole Telescope. The observations used in this work were taken during 2012 and early 2013 and include data in spectral bands centered at 95 …
Supercal: Cross-calibration of Multiple Photometric Systems to Improve Cosmological Measurements with Type Ia Supernovae
Rest, A.; Foley, R. J.; Kudritzki, R. P. +16 more
Current cosmological analyses, which use Type Ia supernova observations, combine supernova (SN) samples to expand the redshift range beyond that of a single sample and increase the overall sample size. The inhomogeneous photometric calibration between different SN samples is one of the largest systematic uncertainties of the cosmological parameter…
Two independent and primitive envelopes of the bilobate nucleus of comet 67P
Bertaux, Jean-Loup; Naletto, Giampiero; Debei, Stefano +56 more
The factors shaping cometary nuclei are still largely unknown, but could be the result of concurrent effects of evolutionary and primordial processes. The peculiar bilobed shape of comet 67P/Churyumov-Gerasimenko may be the result of the fusion of two objects that were once separate or the result of a localized excavation by outgassing at the inte…
The Role of Star Formation and an AGN in Dust Heating of z = 0.3-2.8 Galaxies. I. Evolution with Redshift and Luminosity
Kirkpatrick, Allison; Pope, Alexandra; Díaz-Santos, Tanio +5 more
We characterize infrared spectral energy distributions of 343 (ultra)luminous infrared galaxies from z = 0.3-2.8. We diagnose the presence of an active galactic nucleus (AGN) by decomposing individual Spitzer mid-IR spectroscopy into emission from star formation and an AGN-powered continuum; we classify sources as star-forming galaxies (SFGs), AGN…
A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes
Greiner, J.; Georgakakis, A.; Salvato, M. +6 more
We argue that the `changing look' active galactic nucleus (AGN) recently reported by LaMassa et al. could be a luminous flare produced by the tidal disruption of a supersolar mass star passing just a few gravitational radii outside the event horizon of a ∼108 M⊙ nuclear black hole. This flare occurred in a massive, star-formi…
The nature of the [C II] emission in dusty star-forming galaxies from the SPT survey
Béthermin, M.; Murphy, E. J.; Greve, T. R. +24 more
We present [C II] observations of 20 strongly lensed dusty star-forming galaxies at 2.1 < z < 5.7 using Atacama Pathfinder EXperiment and Herschel. The sources were selected on their 1.4 mm flux (S1.4 mm > 20 mJy) from the South Pole Telescope (SPT) survey, with far-infrared (FIR) luminosities determined from extensive photomet…
Hubble Frontier Fields: a high-precision strong-lensing analysis of the massive galaxy cluster Abell 2744 using ∼180 multiple images
Kneib, J. -P.; Egami, E.; Eckert, D. +11 more
We present a high-precision mass model of galaxy cluster Abell 2744, based on a strong gravitational-lensing analysis of the Hubble Space Telescope Frontier Fields (HFF) imaging data, which now include both Advanced Camera for Surveys and Wide Field Camera 3 observations to the final depth. Taking advantage of the unprecedented depth of the visibl…
CANDELS Visual Classifications: Scheme, Data Release, and First Results
Bell, Eric F.; Castellano, Marco; Kartaltepe, Jeyhan S. +49 more
We have undertaken an ambitious program to visually classify all galaxies in the five CANDELS fields down to H < 24.5 involving the dedicated efforts of over 65 individual classifiers. Once completed, we expect to have detailed morphological classifications for over 50,000 galaxies spanning 0 < z < 4 over all the fields, with classificati…
The landing(s) of Philae and inferences about comet surface mechanical properties
Auster, Hans-Ulrich; Heinisch, Philip; Güttler, Carsten +30 more
The Philae lander, part of the Rosetta mission to investigate comet 67P/Churyumov-Gerasimenko, was delivered to the cometary surface in November 2014. Here we report the precise circumstances of the multiple landings of Philae, including the bouncing trajectory and rebound parameters, based on engineering data in conjunction with operational instr…