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Reverberation Mapping Results for Five Seyfert 1 Galaxies
Skowron, J.; Kochanek, C. S.; Peterson, B. M. +40 more
We present the results from a detailed analysis of photometric and spectrophotometric data on five Seyfert 1 galaxies observed as a part of a recent reverberation mapping program. The data were collected at several observatories over a 140 day span beginning in 2010 August and ending in 2011 January. We obtained high sampling-rate light curves for…
XHIP: An extended hipparcos compilation
Anderson, E.; Francis, Ch.
We present the Extended Hipparcos Compilation (XHIP), a database of all stars in the New Reduction of the Hipparcos Catalog extensively cross-referenced with data from a broad survey of presently available sources. The resulting collection uniquely assigns 116 096 spectral classifications, 46 392 radial velocities, and 18 549 homogenized iron abun…
A Unified Empirical Model for Infrared Galaxy Counts Based on the Observed Physical Evolution of Distant Galaxies
Buat, Véronique; Daddi, Emanuele; Hezaveh, Yashar +10 more
We reproduce the mid-infrared to radio galaxy counts with a new empirical model based on our current understanding of the evolution of main-sequence (MS) and starburst (SB) galaxies. We rely on a simple spectral energy distribution (SED) library based on Herschel observations: a single SED for the MS and another one for SB, getting warmer with red…
A chemical model for the atmosphere of hot Jupiters
Agúndez, M.; Hersant, F.; Dobrijevic, M. +5 more
Context. The atmosphere of hot Jupiters can be probed by primary transit and secondary eclipse spectroscopy. Owing to the intense UV irradiation, mixing, and circulation, their chemical composition is maintained out of equilibrium and must be modeled with kinetic models.
Aims: Our purpose is to release a chemical network and the associated ra…
CANDELS: The Contribution of the Observed Galaxy Population to Cosmic Reionization
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +12 more
We present measurements of the specific ultraviolet luminosity density from a sample of 483 galaxies at 6 <~ z <~ 8. These galaxies were selected from new deep near-infrared Hubble Space Telescope imaging from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey, Hubble UltraDeep Field 2009, and Wide Field Camera 3 Early Releas…
Using the Fundamental Plane of black hole activity to distinguish X-ray processes from weakly accreting black holes
Anderson, Scott F.; Plotkin, Richard M.; Markoff, Sera +2 more
The Fundamental Plane of black hole activity is a relation between X-ray luminosity, radio luminosity and black hole mass for hard-state Galactic black holes and their supermassive analogues. The Fundamental Plane suggests that, at low-accretion rates, the physical processes regulating the conversion of an accretion flow into radiative energy coul…
Modeling the Effects of Star Formation Histories on Hα and Ultraviolet Fluxes in nearby Dwarf Galaxies
Skillman, Evan D.; Williams, Benjamin F.; Johnson, L. Clifton +9 more
We consider the effects of non-constant star formation histories (SFHs) on Hα and GALEX far-ultraviolet (FUV) star formation rate (SFR) indicators. Under the assumption of a fully populated Chabrier initial mass function (IMF), we compare the distribution of Hα-to-FUV flux ratios from ~1500 simple, periodic model SFHs with observations of 185 gala…
X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
Vaughan, S.; González-Martín, O.
Context. Active galactic nuclei (AGN), powered by accretion onto supermassive black holes (SMBHs), are thought to be scaled up versions of Galactic black hole X-ray binaries (BH-XRBs). In the past few years evidence of such correspondence include similarities in the broadband shape of the X-ray variability power spectra, with characteristic bend t…
X-ray-optical classification of cluster mergers and the evolution of the cluster merger fraction
Mann, Andrew W.; Ebeling, Harald
We present the results of a simple but robust morphological classification of a statistically complete sample of 108 of the most X-ray-luminous clusters at 0.15 ≤z≤ 0.7 observed with Chandra. Our aims are to (a) identify the most disturbed massive clusters to be used as gravitational lenses for studies of the distant Universe and as probes of part…
Resolving the Electron Temperature Discrepancies in H II Regions and Planetary Nebulae: κ-distributed Electrons
Dopita, Michael A.; Nicholls, David C.; Sutherland, Ralph S.
The measurement of electron temperatures and metallicities in H II regions and planetary nebulae (PNe) has—for several decades—presented a problem: results obtained using different techniques disagree. What is worse, they disagree consistently. There have been numerous attempts to explain these discrepancies, but none has provided a satisfactory s…