Search Publications
The Stacked Thermal Sunyaev-Zel'dovich Signal of Locally Brightest Galaxies in Planck Full Mission Data: Evidence for Galaxy Feedback?
Battaglia, Nicholas; Spergel, David N.; Hill, J. Colin +1 more
We use the Planck full mission temperature maps to examine the stacked thermal Sunyaev-Zel’dovich (tSZ) signal of 188,042 “locally brightest galaxies” (LBGs) selected from the Sloan Digital Sky Survey Data Release 7. Our LBG sample closely matches that of Planck Collaboration XI (PCXI), but our analysis differs in several ways. We work directly in…
Dependency of Dynamical Ejections of O Stars on the Masses of Very Young Star Clusters
Kroupa, Pavel; Pflamm-Altenburg, Jan; Oh, Seungkyung
Massive stars can be efficiently ejected from their birth star clusters through encounters with other massive stars. We study how the dynamical ejection fraction of O star systems varies with the masses of very young star clusters, {{M}ecl}, by means of direct N-body calculations. We include diverse initial conditions by varying the hal…
CSI 2264: Characterizing Young Stars in NGC 2264 With Short-Duration Periodic Flux Dips in Their Light Curves
Song, Inseok; Gillen, Edward; Cody, Ann Marie +27 more
We identify nine young stellar objects (YSOs) in the NGC 2264 star-forming region with optical CoRoT light curves exhibiting short-duration, shallow periodic flux dips. All of these stars have infrared excesses that are consistent with their having inner disk walls near the Keplerian co-rotation radius. The repeating photometric dips have FWHMs ge…
HerMES: ALMA Imaging of Herschel-selected Dusty Star-forming Galaxies
Pérez-Fournon, I.; Ivison, R. J.; Wang, L. +25 more
The Herschel Multi-tiered Extragalactic Survey (HerMES) has identified large numbers of dusty star-forming galaxies (DSFGs) over a wide range in redshift. A detailed understanding of these DSFGs is hampered by the limited spatial resolution of Herschel. We present 870 µm 0.″45 resolution imaging obtained with the Atacama Large Millimeter/sub…
The powerful jet of an off-nuclear intermediate-mass black hole in the spiral galaxy NGC 2276
Roberts, T. P.; Mezcua, M.; Sutton, A. D. +1 more
Jet ejection by accreting black holes is a mass invariant mechanism unifying stellar and supermassive black holes (SMBHs) that should also apply for intermediate-mass black holes (IMBHs), which are thought to be the seeds from which SMBHs form. We present the detection of an off-nuclear IMBH of ∼5 × 104 M⊙ located in an unusu…
Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources
Böhringer, H.; Kneissl, R.; Dahle, H. +275 more
We update the all-sky Planck catalogue of 1227 clusters and cluster candidates (PSZ1) published in March 2013, derived from detections of the Sunyaev-Zeldovich (SZ) effect using the first 15.5 months of Planck satellite observations. As an addendum, we deliver an updated version of the PSZ1 catalogue, reporting the further confirmation of 86 Planc…
The Formation and Magnetic Structures of Active-region Filaments Observed by NVST, SDO, and Hinode
Yan, X. L.; Xue, Z. K.; Wang, J. C. +4 more
To better understand the properties of solar active-region filaments, we present a detailed study on the formation and magnetic structures of two active-region filaments in active region NOAA 11884 during a period of four days. It is found that the shearing motion of the opposite magnetic polarities and the rotation of the small sunspots with nega…
Quasi-periodic Slipping Magnetic Reconnection During an X-class Solar Flare Observed by the Solar Dynamics Observatory and Interface Region Imaging Spectrograph
Li, Ting; Zhang, Jun
We first report the quasi-periodic slipping motion of flare loops during an eruptive X-class flare on 2014 September 10. The slipping motion was investigated at a specific location along one of the two ribbons and can be observed throughout the impulsive phase of the flare. The apparent slipping velocity was 20-110 km s-1, and the assoc…
Dust Continuum Emission as a Tracer of Gas Mass in Galaxies
Calzetti, Daniela; Schinnerer, Eva; Walter, Fabian +8 more
We use a sample of 36 galaxies from the KINGFISH (Herschel IR), HERACLES (IRAM CO), and THINGS (Very Large Array H I) surveys to study empirical relations between Herschel infrared (IR) luminosities and the total mass of the interstellar gas (H2 + H I). Such a comparison provides a simple empirical relationship without introducing the u…
Properties of dark subhaloes from gaps in tidal streams
Erkal, Denis; Belokurov, Vasily
Cold or warm, the dark matter substructure spectrum must extend to objects with masses as low as 107 M⊙, according to the most recent Lyman α measurements. Around a Milky Way-like galaxy, more than a thousand of these subhaloes will not be able to form stars but are dense enough to survive even deep down in the potential well…