Search Publications
Tracking Filament Evolution in the Low Solar Corona Using Remote Sensing and In Situ Observations
Kocher, Manan; Landi, Enrico; Lepri, Susan. T.
In the present work, we analyze a filament eruption associated with an interplanetary coronal mass ejection that arrived at L1 on 2011 August 5. In multiwavelength Solar Dynamic Observatory/Advanced Imaging Assembly (AIA) images, three plasma parcels within the filament were tracked at high cadence along the solar corona. A novel absorption diagno…
Deconvolving the HD 81809 Binary: Rotational and Activity Evidence for a Subgiant with a Sun-like Cycle
Egeland, Ricky
HD 81809 has one of the highest quality activity cycles from the sample of stars synoptically observed in the Mount Wilson Observatory HK Project. However, this object is in fact a binary system, raising the question as to which of the components is responsible for the observed cyclic activity and what are the properties of that active component. …
Stormy Weather in 3C 196.1: Nuclear Outbursts and Merger Events Shape the Environment of the Hybrid Radio Galaxy 3C 196.1
Lovisari, L.; Forman, W. R.; Liuzzo, E. +8 more
We present a multiwavelength analysis based on archival radio, optical, and X-ray data of the complex radio source 3C 196.1, whose host is the brightest cluster galaxy of a z = 0.198 cluster. HST data show Hα+[N II] emission aligned with the jet 8.4 GHz radio emission. An Hα+[N II] filament coincides with the brightest X-ray emission, the northern…
The Identification of Hydrogen-deficient Cataclysmic Variable Donor Stars
Harrison, Thomas E.
We have used ATLAS12 to generate hydrogen-deficient stellar atmospheres to allow us to construct synthetic spectra to explore the possibility that the donor stars in some cataclysmic variables (CVs) are hydrogen deficient. We find that four systems, AE Aqr, DX And, EY Cyg, and QZ Ser, have significant hydrogen deficits. We confirm that carbon and …
Deep Chandra Observations of X-Ray Point Sources in M87
Goulding, Andy D.; Andrade-Santos, Felipe; Jones, Christine +6 more
We present a study of X-ray source populations in M87, the cD galaxy of the Virgo cluster, using 12 archival Chandra observations with a total exposure of ∼680 ks spanning about a decade. A total of 346 point-like sources are detected down to a limiting 0.5-8 keV luminosity of 4 × 1037 erg s-1 and out to a galactocentric radi…
Cospatial Star Formation and Supermassive Black Hole Growth in z ∼ 3 Galaxies: Evidence for In Situ Co-evolution
Elbaz, D.; Ivison, R. J.; Smolčić, V. +7 more
We present a sub-kiloparsec localization of the sites of supermassive black hole (SMBH) growth in three active galactic nuclei (AGNs) at z ∼ 3 in relation to the regions of intense star formation in their hosts. These AGNs are selected from Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA) observations i…
Habitability in the Omega Centauri Cluster
Kane, Stephen R.; Deveny, Sarah J.
The search for exoplanets has encompassed a broad range of stellar environments, from single stars in the solar neighborhood to multiple stars and various open clusters. The stellar environment has a profound effect on planet formation and stability evolution and is thus a key component of exoplanetary studies. Dense stellar environments, such as …
Near-infrared to Mid-infrared Observations of Galaxy Mergers: NGC 2782 and NGC 7727
Lebouteiller, Vianney; Onaka, Takashi; Sakon, Itsuki +5 more
We present the results of near-infrared-to-mid-infrared (NIR-to-MIR) imaging and NIR spectroscopic observations of two galaxy mergers, NGC 2782 (Arp 215) and NGC 7727 (Arp 222), with the Infrared Camera on board AKARI. NGC 2782 shows extended MIR emission in the eastern side of the galaxy, which corresponds to the eastern tidal tail seen in the H …
Testing the Breathing Mode in Intermediate-mass Galaxies and Its Predicted Star Formation Rate-size Anti-correlation
Kelson, Daniel D.; Patel, Shannon G.; Tonnesen, Stephanie +2 more
Recent hydrodynamical simulations predict that stellar feedback in intermediate-mass galaxies (IMGs) can drive strong fluctuations in structure (e.g., half-light radius, R e ). This process operates on timescales of only a few hundred Myr and persists even at late cosmic times. One prediction of this quasi-periodic, galactic-scale “bre…
Twisting/Swirling Motions during a Prominence Eruption as Seen from SDO/AIA
Banerjee, D.; Ray, S.; Pant, V. +2 more
A quiescent prominence was observed at the northwest limb of the Sun using different channels of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We report and analyze twisting/swirling motions during and after the prominence eruption. We segregate the observed rotational motions into small and large scales. Small-scale ro…