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A Reverberation-based Black Hole Mass for MCG-06-30-15
Horne, Keith; Cackett, Edward M.; Crenshaw, D. Michael +3 more
We present the results of a reverberation campaign targeting MGC-06-30-15. Spectrophotometric monitoring and broad-band photometric monitoring over the course of four months in spring 2012 allowed a determination of a time delay in the broad Hβ emission line of τ = 5.3 ± 1.8 days in the rest frame of the active galactic nucleus (AGN). Combined wit…
Dynamical Masses of Young Stars. I. Discordant Model Ages of Upper Scorpius
Rizzuto, Aaron C.; Dupuy, Trent J.; Ireland, Michael J. +1 more
We present the results of a long-term orbit monitoring program, using sparse aperture masking observations taken with NIRC2 on the Keck-II telescope, of seven G- to M-type members of the Upper Scorpius subgroup of the Sco-Cen OB association. We present astrometry and derived orbital elements of the binary systems we have monitored, and also determ…
Comparison of Damped Oscillations in Solar and Stellar X-Ray flares
Kim, S.; Cho, K. -S.; Nakariakov, V. M. +2 more
We explore the similarity and difference of the quasi-periodic pulsations (QPPs) observed in the decay phase of solar and stellar flares at X-rays. We identified 42 solar flares with pronounced QPPs, observed with RHESSI, and 36 stellar flares with QPPs, observed with XMM-Newton. The empirical mode decomposition (EMD) method and least-squares fit …
Hubble Tarantula Treasury Project - IV. The extinction law
Anderson, Jay; Grebel, Eva K.; Aloisi, Alessandra +10 more
We report on the study of interstellar extinction across the Tarantula Nebula (30 Doradus), in the Large Magellanic Cloud, using observations from the Hubble Tarantula Treasury Project in the 0.3-1.6 µm range. The considerable and patchy extinction inside the nebula causes about 3500 red clump stars to be scattered along the reddening vector…
Gas Dynamics and Outflow in the Barred Starburst Galaxy NGC 1808 Revealed with ALMA
Salak, Dragan; Nakai, Naomasa; Miyamoto, Yusuke +1 more
NGC 1808 is a nearby barred starburst galaxy with an outflow from the nuclear region. To study the inflow and outflow processes related to star formation and dynamical evolution of the galaxy, we have carried out 12CO (J=1-0) mapping observations of the central r ∼ 4 kpc of NGC 1808 using the Atacama Large Millimeter/submillimeter Array…
A Dipole on the Sky: Predictions for Hypervelocity Stars from the Large Magellanic Cloud
Boubert, Douglas; Evans, N. Wyn
We predict the distribution of hypervelocity stars (HVSs) ejected from the Large Magellanic Cloud (LMC), under the assumption that the dwarf galaxy hosts a central massive black hole (MBH). For the majority of stars ejected from the LMC, the orbital velocity of the LMC has contributed a significant fraction of their galactic rest-frame velocity, l…
Cross-correlation of gravitational lensing from DES Science Verification data with SPT and Planck lensing
Benoit-Lévy, A.; Bacon, D.; Nichol, R. C. +89 more
We measure the cross-correlation between weak lensing of galaxy images and of the cosmic microwave background (CMB). The effects of gravitational lensing on different sources will be correlated if the lensing is caused by the same mass fluctuations. We use galaxy shape measurements from 139 deg2 of the Dark Energy Survey (DES) Science V…
Time-dependent magnetohydrodynamic simulations of the inner heliosphere
Merkin, V. G.; Lyon, J. G.; Lario, D. +2 more
This paper presents results from a simulation study exploring heliospheric consequences of time-dependent changes at the Sun. We selected a 2 month period in the beginning of year 2008 that was characterized by very low solar activity. The heliosphere in the equatorial region was dominated by two coronal holes whose changing structure created temp…
The detection and X-ray view of the changing look AGN HE 1136-2304
Harrison, F. A.; Schartel, N.; Rodríguez-Pascual, P. M. +9 more
We report the detection of high-amplitude X-ray flaring of the AGN HE 1136-2304, which is accompanied by a strong increase in the flux of the broad Balmer lines, changing its Seyfert type from almost type 2 in 1993 down to 1.5 in 2014. HE 1136-2304 was detected by the XMM-Newton slew survey at >10 times the flux it had in the ROSAT all-sky surv…
ZFOURGE catalogue of AGN candidates: an enhancement of 160-µm-derived star formation rates in active galaxies to z = 3.2
Papovich, Casey; van Dokkum, Pieter G.; Allen, Rebecca J. +15 more
We investigate active galactic nuclei (AGN) candidates within the FourStar Galaxy Evolution Survey (ZFOURGE) to determine the impact they have on star formation in their host galaxies. We first identify a population of radio, X-ray, and infrared-selected AGN by cross-matching the deep Ks-band imaging of ZFOURGE with overlapping multiwav…