Search Publications
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…
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…
On the shear estimation bias induced by the spatial variation of colour across galaxy profiles
Schrabback, T.; Huang, Z.; Hoekstra, H. +13 more
The spatial variation of the colour of a galaxy may introduce a bias in the measurement of its shape if the point spread function (PSF) profile depends on wavelength. We study how this bias depends on the properties of the PSF and the galaxies themselves. The bias depends on the scales used to estimate the shape, which may be used to optimize meth…
Unveiling new members in five nearby young moving groups
Ábrahám, P.; Kóspál, Á.; Kiss, L. L. +5 more
In the past decade many kinematic groups of young stars (<100 Myr) were discovered in the solar neighbourhood. Since the most interesting period of planet formation overlaps with the age of these groups, their well dated members are attractive targets for exoplanet searches by direct imaging. We combined astrometric, photometric and X-ray data,…
Bottom-heavy initial mass function in a nearby compact l{star} galaxy.
La Barbera, F.; Vazdekis, A.; Ferreras, I. +4 more
We present orbit-based dynamical models and stellar population analysis of Sloan Digital Sky Survey J151741.75-004217.6, a low-redshift (z = 0.116) early-type galaxy (ETG) which, for its moderate luminosity, has an exceptionally high velocity dispersion. We aim to determine the central black hole (BH) mass (M•), the i-band stellar mass-…
Simulations of the merging galaxy cluster Abell 3376
Lima Neto, Gastão B.; Machado, Rubens E. G.
Observed galaxy clusters often exhibit X-ray morphologies suggestive of recent interaction with an infalling subcluster. A3376 is a nearby (z = 0.046) massive galaxy cluster whose bullet-shaped X-ray emission indicates that it may have undergone a recent collision. It displays a pair of Mpc-scale radio relics and its brightest cluster galaxy is lo…
An examination of the spectral variability in NGC 1365 with Suzaku
Elvis, M.; Nardini, E.; Brenneman, L. W. +1 more
We present jointly analysed data from three deep Suzaku observations of NGC 1365. These high-signal-to-noise spectra enable us to examine the nature of this variable, obscured active galactic nucleus (AGN) in unprecedented detail on time-scales ranging from hours to years. We find that in addition to the power-law continuum and absorption from ion…
The SCUBA-2 Cosmology Legacy Survey: demographics of the 450-µm population
Smail, I.; Ivison, R. J.; van Kampen, E. +47 more
We investigate the multiwavelength properties of a sample of 450-µm-selected sources from the SCUBA-2 Cosmology Legacy Survey. A total of 69 sources were identified above 4σ in deep SCUBA-2 450-µm observations overlapping the UDS and COSMOS fields and covering 210 arcmin2 to a typical depth of σ450 = 1.5 mJy. Reli…
Luminosity profiles and sizes of massive star clusters in NGC 7252
Bastian, N.; Larsen, S. S.; Kissler-Patig, M. +2 more
We present Hubble Space Telescope (HST) Wide-Field Camera 3 (WFC3) images of the merger remnant NGC 7252. In particular, we focus on the surface brightness profiles and effective radii Reff of 36 young massive clusters (YMCs) within the galaxy. All the clusters have masses exceeding 105 M⊙ and are, despite the 64 M…
Circumstellar habitable zones of binary-star systems in the solar neighbourhood
Eggl, S.; Haghighipour, N.; Pilat-Lohinger, E. +2 more
Binary and multiple systems constitute more than half of the total stellar population in the solar neighbourhood. Their frequent occurrence as well as the fact that more than 70 planets have already been discovered in such configurations - most notably the telluric companion of α Cen B - make them interesting targets in the search for habitable wo…