Search Publications
Missions
Journals
Publication Years
The flux-dependent X-ray time lags in NGC 4051
Vaughan, S.; Uttley, P.; Alston, W. N.
We present an analysis of the X-ray time lags for the highly variable Seyfert 1 galaxy NGC 4051, based on a series of XMM-Newton observations taken in 2009. We investigate the Fourier frequency dependent time lags in the light curves between the 0.3-1.0 keV and 2.0-5.0 keV energy bands as a function of source flux, including simultaneous modelling…
GAMA/H-ATLAS: The Dust Opacity-Stellar Mass Surface Density Relation for Spiral Galaxies
Cooray, A.; De Zotti, G.; Baes, M. +32 more
We report the discovery of a well-defined correlation between B-band face-on central optical depth due to dust, τ ^f_B, and the stellar mass surface density, µ*, of nearby (z <= 0.13) spiral galaxies: {log}(τ ^{f}_{B}) = 1.12(+/- 0.11) \cdot {log}({µ _{*}}/{{M}_{⊙ } {kpc}^{-2}}) - 8.6(+/- 0.8). This relation was derived f…
Suzaku X-Ray Observations of the Accreting NGC 4839 Group of Galaxies and a Radio Relic in the Coma Cluster
Sarazin, Craig L.; Inoue, Susumu; Akamatsu, Hiroki +3 more
Based on Suzaku X-ray observations, we studied the hot gas around the NGC 4839 group of galaxies and a radio relic in the outskirts of the Coma cluster. We found a gradual decline in the gas temperature from 5 keV around NGC 4839 to 3.6 keV at the radio relic, across which there is a further, steeper drop down to 1.5 keV. This drop as well as the …
Shock Excited Molecules in NGC 1266: ULIRG Conditions at the Center of a Bulge-dominated Galaxy
Rigopoulou, D.; Murphy, E. J.; Armus, L. +28 more
We investigate the far infrared (IR) spectrum of NGC 1266, a S0 galaxy that contains a massive reservoir of highly excited molecular gas. Using the Herschel Fourier Transform Spectrometer, we detect the 12CO ladder up to J = (13-12), [C I] and [N II] lines, and also strong water lines more characteristic of UltraLuminous IR Galaxies (UL…
Hectospec and Hydra Spectra of Infrared Luminous Sources in the AKARI North Ecliptic Pole Survey Field
Kim, Seong Jin; Papovich, Casey; Weiner, Benjamin J. +7 more
We present spectra of 1796 sources selected in the AKARI North Ecliptic Pole Wide Survey field, obtained with MMT/Hectospec and WIYN/Hydra, for which we measure 1645 redshifts. We complemented the generic flux-limited spectroscopic surveys at 11 µm and 15 µm, with additional sources selected based on the MIR and optical colors. In MMT/…
Precipitation-induced surface brightenings seen on Titan by Cassini VIMS and ISS
Nicholson, Philip D.; Sotin, Christophe; Barnes, Jason W. +17 more
Constraints on the nature of CID-42: recoil kick or supermassive black hole pair?
Elvis, Martin; Loeb, Abraham; Blecha, Laura +1 more
The galaxy CXOC J100043.1+020637, also known as CID-42, is a highly unusual object. As an apparent galaxy merger remnant, it displays signatures of both an inspiraling, kiloparsec-scale active galactic nucleus (AGN) pair and of a recoiling AGN with a kick velocity of ≳ 1300 km s-1. Among recoiling AGN candidates, CID-42 alone has both s…
Evidence for Hot Fast Flow above a Solar Flare Arcade
Shimizu, T.; Hara, H.; Watanabe, T. +3 more
Solar flares are one of the main forces behind space weather events. However, the mechanism that drives such energetic phenomena is not fully understood. The standard eruptive flare model predicts that magnetic reconnection occurs high in the corona where hot fast flows are created. Some imaging or spectroscopic observations have indicated the pre…
The Spectrally Resolved Lyα Emission of Three Lyα-selected Field Galaxies at z ~ 2.4 from the HETDEX Pilot Survey
Finkelstein, Steven L.; Kollmeier, Juna A.; Blanc, Guillermo A. +11 more
We present new results on the spectrally resolved Lyα emission of three Lyα-emitting field galaxies at z ~ 2.4 with high Lyα equivalent width (>100 Å) and Lyα luminosity (~1043 erg s-1). At 120 km s-1 (FWHM) spectral resolution, the prominent double-peaked Lyα profile straddles the systemic velocity, where the v…
The baryon budget on the galaxy group/cluster boundary
Zabludoff, Ann I.; Gonzalez, Anthony H.; Zaritsky, Dennis +4 more
We present a study of the hot gas and stellar content of five optically selected poor galaxy clusters, including a full accounting of the contribution from intracluster light (ICL) and a combined hot gas and hydrostatic X-ray mass analysis with XMM-Newton observations. We find weighted mean stellar (including ICL), gas and total baryon mass fracti…