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Cosmological constraints on interacting light particles
Sigurdson, Kris; Brust, Christopher; Cui, Yanou
Cosmological observations are becoming increasingly sensitive to the effects of light particles in the form of dark radiation (DR) at the time of recombination. The conventional observable of effective neutrino number, Neff, is insufficient for probing generic, interacting models of DR. In this work, we perform likelihood analyses which…
Mapping the kinetic Sunyaev-Zel'dovich effect toward MACS J0717.5+3745 with NIKA
Adam, R.; Arnaud, M.; Benoît, A. +47 more
Measurement of the gas velocity distribution in galaxy clusters provides insight into the physics of mergers, through which large scale structures form in the Universe. Velocity estimates within the intracluster medium (ICM) can be obtained via the Sunyaev-Zel'dovich (SZ) effect, but its observation is challenging both in term of sensitivity requi…
The implications of the surprising existence of a large, massive CO disk in a distant protocluster
Altieri, B.; Valtchanov, I.; Tanaka, M. +18 more
It is not yet known if the properties of molecular gas in distant protocluster galaxies are significantly affected by their environment as galaxies are in local clusters. Through a deep, 64 h of effective on-source integration with the Australian Telescope Compact Array (ATCA), we discovered a massive, Mmol = 2.0 ± 0.2× 1011 …
General Physical Properties of CGRaBS Blazars
Ajello, M.; Rao, A. R.; Hartmann, D. +4 more
We present the results of a multi-frequency, time-averaged analysis of blazars included in the Candidate Gamma-ray Blazar Survey catalog. Our sample consists of 324 γ-ray detected (γ-ray loud) and 191 γ-ray undetected (γ-ray quiet) blazars; we consider all the data up to 2016 April 1. We find that both the γ-ray loud and γ-ray quiet blazar populat…
Hunting black holes with Gaia
Loeb, Abraham; Mashian, Natalie
We predict the number of black holes with stellar companions that are potentially detectable with Gaia astrometry over the course of its 5-yr mission. Our model estimates that nearly 2 × 105 astrometric binaries hosting black holes and stellar companions brighter than Gaia's detection threshold, G ∼ 20, should be discovered with 5σ sens…
The Hierarchical Distribution of the Young Stellar Clusters in Six Local Star-forming Galaxies
Dale, D. A.; Calzetti, D.; Kennicutt, R. C. +16 more
We present a study of the hierarchical clustering of the young stellar clusters in six local (3-15 Mpc) star-forming galaxies using Hubble Space Telescope broadband WFC3/UVIS UV and optical images from the Treasury Program LEGUS (Legacy ExtraGalactic UV Survey). We identified 3685 likely clusters and associations, each visually classified by their…
Dust-deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission
Lyu, Jianwei; Rieke, G. H.; Shi, Yong
To elucidate the intrinsic broadband infrared (IR) emission properties of active galactic nuclei (AGNs), we analyze the spectral energy distributions (SEDs) of 87 z ≲ 0.5 Palomar-Green (PG) quasars. While the Elvis AGN template with a moderate far-IR correction can reasonably match the SEDs of the AGN components in ∼60% of the sample (and is super…
The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE
Papovich, Casey; Allen, Rebecca J.; Kacprzak, Glenn G. +10 more
For the first time, we present the size evolution of a mass-complete (log(M*/M⊙) > 10) sample of star-forming galaxies over redshifts z = 1-7, selected from the FourStar Galaxy Evolution Survey. Observed H-band sizes are measured from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) Hubble Space…
Fading AGN Candidates: AGN Histories and Outflow Signatures
Schawinski, Kevin; Sartori, Lia F.; Keel, William C. +12 more
We consider the energy budgets and radiative history of eight fading active galactic nuclei (AGNs), identified from an energy shortfall between the requirements to ionize very extended (radius > 10 kpc) ionized clouds and the luminosity of the nucleus as we view it directly. All show evidence of significant fading on timescales of ≈50,000 yr. W…
CANDELS: Elevated Black Hole Growth in the Progenitors of Compact Quiescent Galaxies at z ∼ 2
Barro, Guillermo; Santini, Paola; Giavalisco, Mauro +31 more
We examine the fraction of massive ({M}* > {10}10 {M}⊙ ) compact star-forming galaxies (cSFGs) that host an active galactic nucleus (AGN) at z∼ 2. These cSFGs are likely the direct progenitors of the compact quiescent galaxies observed at this epoch, which are the first population of passive galaxies to appear i…