Search Publications
Nuclear Star Formation Activity and Black Hole Accretion in Nearby Seyfert Galaxies
Esquej, P.; Hernán-Caballero, A.; Hönig, S. F. +10 more
Recent theoretical and observational works indicate the presence of a correlation between the star-formation rate (SFR) and active galactic nucleus (AGN) luminosity (and, therefore, the black hole accretion rate, \dot{M}_BH) of Seyfert galaxies. This suggests a physical connection between the gas-forming stars on kpc scales and the gas on sub-pc s…
Power Asymmetry in WMAP and Planck Temperature Sky Maps as Measured by a Local Variance Estimator
Banday, A. J.; Eriksen, H. K.; Górski, K. M. +4 more
We revisit the question of hemispherical power asymmetry in the WMAP and Planck temperature sky maps by measuring the local variance over the sky and on disks of various sizes. For the 2013 Planck sky map we find that none of the 1000 available isotropic Planck "Full Focal Plane" simulations have a larger variance asymmetry than that estimated fro…
HD 106906 b: A Planetary-mass Companion Outside a Massive Debris Disk
Mamajek, Eric; Weinberger, Alycia J.; Reiter, Megan +14 more
We report the discovery of a planetary-mass companion, HD 106906 b, with the new Magellan Adaptive Optics (MagAO) + Clio2 system. The companion is detected with Clio2 in three bands: J, KS , and L', and lies at a projected separation of 7.''1 (650 AU). It is confirmed to be comoving with its 13 ± 2 Myr F5 host using Hubble Space Telesco…
Type-Ia Supernova Rates to Redshift 2.4 from CLASH: The Cluster Lensing And Supernova Survey with Hubble
Cenko, S. B.; Molino, A.; Leibundgut, B. +38 more
We present the supernova (SN) sample and Type-Ia SN (SN Ia) rates from the Cluster Lensing And Supernova survey with Hubble (CLASH). Using the Advanced Camera for Surveys and the Wide Field Camera 3 on the Hubble Space Telescope (HST), we have imaged 25 galaxy-cluster fields and parallel fields of non-cluster galaxies. We report a sample of 27 SNe…
Connecting Speeds, Directions and Arrival Times of 22 Coronal Mass Ejections from the Sun to 1 AU
Luhmann, J. G.; Möstl, C.; Farrugia, C. J. +15 more
Forecasting the in situ properties of coronal mass ejections (CMEs) from remote images is expected to strongly enhance predictions of space weather and is of general interest for studying the interaction of CMEs with planetary environments. We study the feasibility of using a single heliospheric imager (HI) instrument, imaging the solar wind densi…
Star Formation Relations and CO Spectral Line Energy Distributions across the J-ladder and Redshift
Veilleux, S.; Armus, L.; Greve, T. R. +19 more
We present FIR [50-300 µm]-CO luminosity relations (i.e., log L_FIR = α log L\prime _CO + β) for the full CO rotational ladder from J = 1-0 up to J = 13-12 for a sample of 62 local (z <= 0.1) (Ultra) Luminous Infrared Galaxies (LIRGs; L IR[8-1000 µm] > 1011 L ⊙) using data from Herschel…
The COS/UVES Absorption Survey of the Magellanic Stream. III. Ionization, Total Mass, and Inflow Rate onto the Milky Way
Richter, Philipp; Charlton, Jane C.; Kumari, Nimisha +14 more
Dynamic interactions between the two Magellanic Clouds have flung large quantities of gas into the halo of the Milky Way. The result is a spectacular arrangement of gaseous structures, including the Magellanic Stream, the Magellanic Bridge, and the Leading Arm (collectively referred to as the Magellanic System). In this third paper of a series stu…
Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. I. Dust Properties and Insights into the Origin of the Submillimeter Excess Emission
Okumura, K.; Gordon, Karl D.; Bot, Caroline +33 more
The dust properties in the Large and Small Magellanic clouds (LMC/SMC) are studied using the HERITAGE Herschel Key Project photometric data in five bands from 100 to 500 µm. Three simple models of dust emission were fit to the observations: a single temperature blackbody modified by a power-law emissivity (SMBB), a single temperature blackbo…
16 yr of RXTE Monitoring of Five Anomalous X-Ray Pulsars
Kaspi, Victoria M.; Dib, Rim
We present a summary of the long-term evolution of various properties of the five non-transient anomalous X-ray pulsars (AXPs) 1E 1841-045, RXS J170849.0-400910, 1E 2259+586, 4U 0142+61, and 1E 1048.1-5937, regularly monitored with RXTE from 1996 to 2012. We focus on three properties of these sources: the evolution of the timing, pulsed flux, and …
The Role of Stellar Feedback in the Dynamics of H II Regions
Ramirez-Ruiz, Enrico; Prochaska, J. Xavier; Bolatto, Alberto D. +3 more
Stellar feedback is often cited as the biggest uncertainty in galaxy formation models today. This uncertainty stems from a dearth of observational constraints as well as the great dynamic range between the small scales (lsim1 pc) where the feedback originates and the large scales of galaxies (gsim1 kpc) that are shaped by this feedback. To bridge …