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The High-velocity System: Infall of a Giant Low-surface-brightness Galaxy toward the Center of the Perseus Cluster
Ohyama, Youichi; Broadhurst, T.; Lim, Jeremy +2 more
The high-velocity system (HVS) lies just north-west of the center and is moving at a speed of 3000 km s-1 toward NGC 1275, the central giant elliptical galaxy in the Perseus cluster. We report imaging spectroscopy of the HVS in Hα and [N ii] that resolves both the nature of this galaxy and its physical relationship with NGC 1275. The HV…
Active region upflows. I. Multi-instrument observations
Doyle, J. G.; Madjarska, M. S.; Huang, Z. +2 more
Context. We study upflows at the edges of active regions, called AR outflows, using multi-instrument observations.
Aims: This study intends to provide the first direct observational evidence of whether chromospheric jets play an important role in furnishing mass that could sustain coronal upflows. The evolution of the photospheric magnetic fi…
The impact of cosmic variance on simulating weak lensing surveys
Mandelbaum, Rachel; Kannawadi, Arun; Lackner, Claire
Upcoming weak lensing surveys will survey large cosmological volumes to measure the growth of cosmological structure with time and thereby constrain dark energy. One major systematic uncertainty in this process is the calibration of the weak lensing shape distortions, or shears. Most upcoming surveys plan to test several aspects of their shear est…
Far-infrared excess emission as a tracer of disk-halo interaction
Boulanger, F.; Lagache, G.; Kerp, J. +3 more
Context. Given the current and past star-formation in the Milky Way in combination with the limited gas supply, the re-fuelling of the reservoir of cool gas is an important aspect of Galactic astrophysics. The infall of H i halo clouds can, among other mechanisms, contribute to solving this problem.
Aims: We study the intermediate-velocity cl…
The Kullback-Leibler divergence as an estimator of the statistical properties of CMB maps
Liu, Hao; Ben-David, Assaf; Jackson, Andrew D.
The identification of unsubtracted foreground residuals in the cosmic microwave background maps on large scales is of crucial importance for the analysis of polarization signals. These residuals add a non-Gaussian contribution to the data. We propose the Kullback-Leibler (KL) divergence as an effective, non-parametric test on the one-point probabi…
The Young Stellar Object Population in the Vela-D Molecular Cloud
Elia, D.; Pezzuto, S.; Molinari, S. +7 more
We investigate the young stellar population in the Vela Molecular Ridge, Cloud-D, a star-forming region observed by both the Spitzer/NASA and Herschel/ESA space telescopes. The point-source, band-merged, Spitzer-IRAC catalog complemented with MIPS photometry previously obtained is used to search for candidate young stellar objects (YSOs), also inc…
The Evolved Main-sequence Channel: HST and LBT Observations of CSS120422:111127+571239
Szkody, P.; Garnavich, P.; Kennedy, M. +3 more
The “evolved main-sequence (EMS)” channel is thought to contribute significantly to the population of AM CVn-type systems in the Galaxy, and also to the number of cataclysmic variables (CVs) detected below the period minimum for hydrogen rich systems. CSS 120422:J111127+571239 was discovered by the Catalina Sky Survey in 2012 April. Its period was…
LEGUS Discovery of a Light Echo Around Supernova 2012aw
Van Dyk, Schuyler D.; Anderson, Jay; Grebel, Eva K. +9 more
We have discovered a luminous light echo around the normal Type II-Plateau Supernova (SN) 2012aw in Messier 95 (M95; NGC 3351), detected in images obtained approximately two years after explosion with the Wide Field Channel 3 on board the Hubble Space Telescope by the Legacy ExtraGalactic Ultraviolet Survey. The multi-band observations span from t…
Measures of the Soft X-ray Excess as an Eigenvector 1 Parameter for Active Galactic Nuclei
Marziani, P.; Perea, J.; del Olmo, A. +2 more
We present a preliminary analysis of X-ray data of quasars in the context of the 4D eigenvector 1 parameter space (Sulentic et al. 2000a, b). 4DE1 serves as a surrogate H-R diagram for representing empirical diversity among quasars and identifying the physical drivers of the diversity. The soft X-ray spectral index (Γsoft) was adopted a…
A New Luminous Blue Variable in M31
Humphreys, Roberta M.; Gordon, Michael S.; Martin, John C.
Not Available
Based on observations with the Multiple Mirror Telescope, a joint facility of the Smithsonian Institution and the University of Arizona.