Search Publications
The RAVE-on Catalog of Stellar Atmospheric Parameters and Chemical Abundances for Chemo-dynamic Studies in the Gaia Era
Grebel, Eva K.; Hogg, David W.; Steinmetz, Matthias +24 more
The orbits, atmospheric parameters, chemical abundances, and ages of individual stars in the Milky Way provide the most comprehensive illustration of galaxy formation available. The Tycho-Gaia Astrometric Solution (TGAS) will deliver astrometric parameters for the largest ever sample of Milky Way stars, though its full potential cannot be realized…
Far-ultraviolet to Near-infrared Spectroscopy of a Nearby Hydrogen-poor Superluminous Supernova Gaia16apd
Cenko, S. B.; Gal-Yam, A.; Kasliwal, M. +8 more
We report the first maximum-light far-ultraviolet (FUV) to near-infrared (NIR) spectra (1000 Å - 1.62 µm, rest) of a hydrogen-poor superluminous supernova, Gaia16apd. At z = 0.1018, it is the second closest and the UV brightest SLSN-I, with 17.4 mag in Swift UVW2 band at -11 days pre-maximum. The coordinated observations with HST, Palomar, a…
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…
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…
LOFAR Discovery of the Fastest-spinning Millisecond Pulsar in the Galactic Field
Burnett, T. H.; Camilo, F.; Michelson, P. F. +15 more
We report the discovery of PSR J0952-0607, a 707 Hz binary millisecond pulsar that is now the fastest-spinning neutron star known in the Galactic field (I.e., outside of a globular cluster). PSR J0952-0607 was found using LOFAR at a central observing frequency of 135 MHz, well below the 300 MHz to 3 GHz frequencies typically used in pulsar searche…
Modeling the Anomalous Microwave Emission with Spinning Nanoparticles: No PAHs Required
Draine, B. T.; Hensley, Brandon S.
In light of recent observational results indicating an apparent lack of correlation between the anomalous microwave emission (AME) and mid-infrared emission from polycyclic aromatic hydrocarbons, we assess whether rotational emission from spinning silicate and/or iron nanoparticles could account for the observed AME without violating observational…