Search Publications
The orientation dependence of quasar single-epoch black hole mass scaling relationships
Wills, B. J.; Brotherton, M. S.; Runnoe, Jessie C. +2 more
Black hole masses are estimated for radio-loud quasars using several self-consistent scaling relationships based on emission-line widths and continuum luminosities. The emission lines used, Hβ, Mg ii λ2798 and C iv λ1549, have different dependencies on orientation as estimated by radio core dominance. We compare differences in the log of black hol…
Star formation in luminous quasar host galaxies at z = 1-2
Baum, Stefi A.; O'Dea, Christopher P.; Dunlop, James S. +4 more
We present deep Hubble Space Telescope (HST)/Wide-Field Planetary Camera 2 (WFPC2), rest-frame U images of 17 ∼L⋆ quasars at z ≈ 1 and 2 (V and I bands, respectively), designed to explore the host galaxies. We fit the images with simple axisymmetric galaxy models, including a point source, in order to separate nuclear and host-galaxy em…
The local luminosity function of star-forming galaxies derived from the Planck Early Release Compact Source Catalogue
Bonavera, L.; Clements, D. L.; Delabrouille, J. +18 more
The Planck Early Release Compact Source Catalogue (ERCSC) has offered the first opportunity to accurately determine the luminosity function of dusty galaxies in the very local Universe (i.e. distances ≲100 Mpc), at several (sub-)millimetre wavelengths, using blindly selected samples of low-redshift sources, unaffected by cosmological evolution. Th…
Modelling the interaction of thermonuclear supernova remnants with circumstellar structures: the case of Tycho's supernova remnant
Kaastra, J. S.; Vink, J.; Chiotellis, A. +2 more
The well-established Type Ia remnant of Tycho's supernova (SN 1572) reveals discrepant ambient medium-density estimates based on either the measured dynamics or the X-ray emission properties. This discrepancy can potentially be solved by assuming that the supernova remnant (SNR) shock initially moved through a stellar wind bubble, but is currently…
Characterization of the optical and X-ray properties of the north-western wisps in the Crab nebula
Bucciantini, N.; Weisskopf, M. C.; Idec, W. +4 more
We have studied the wisps to the north-west of the Crab pulsar as part of a multiwavelength campaign in the visible and in X-rays. Optical observations were obtained using the Nordic Optical Telescope in La Palma and X-ray observations were made with the Chandra X-ray Observatory. The observing campaign took place from 2010 October until 2012 Sept…
The ionized absorber and nuclear environment of IRAS 13349+2438: multi-wavelength insights from coordinated Chandra HETGS, HST STIS, HET and Spitzer IRS
Brandt, William N.; Hines, Dean C.; Reynolds, Christopher S. +6 more
We present results from a multi-wavelength infrared (IR)-to-X-ray campaign of the infrared bright (but highly optical-ultraviolet extincted) quasi-stellar object (QSO) IRAS 13349+2438 obtained with the Chandra High Energy Transmission Grating Spectrometer (HETGS), the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS), the Ho…
A multiwavelength view of cooling versus AGN heating in the X-ray luminous cool-core of Abell 3581
Fabian, A. C.; Giacintucci, S.; Salomé, P. +12 more
We report the results of a multiwavelength study of the nearby galaxy group, Abell 3581 (z = 0.0218). This system hosts the most luminous cool core of any nearby group and exhibits active radio mode feedback from the supermassive black hole in its brightest group galaxy, IC 4374. The brightest galaxy has suffered multiple active galactic nucleus o…
The roles of star formation and AGN activity of IRS sources in the HerMES fields
Feltre, A.; Hatziminaoglou, E.; Hernán-Caballero, A. +16 more
In this work, we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in the same galaxies. To do this, we apply a multicomponent, multiband spectral synthesis technique to a sample of 250 µm selected g…
A near-infrared relationship for estimating black hole masses in active galactic nuclei
Peterson, Bradley M.; Elvis, Martin; Karovska, Margarita +4 more
Black hole masses for samples of active galactic nuclei (AGN) are currently estimated from single-epoch optical spectra using scaling relations anchored in reverberation mapping results. In particular, the two quantities needed for calculating black hole masses, namely the velocity and the radial distance of the orbiting gas are derived from the w…
Constraining the bright-end of the UV luminosity function for z ≈ 7-9 galaxies: results from CANDELS/GOODS-South
Wilkins, Stephen M.; Bunker, Andrew J.; Caruana, Joseph +3 more
The recent Hubble Space Telescope near-infrared imaging with the Wide-Field Camera #3 (WFC 3) of the Great Observatories Origins Deep Survey South (GOODS-S) field in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) programme covering nearly 100 arcmin2, along with already existing Advanced Camera for Surveys …