Search Publications
Outflows, Dusty Cores, and a Burst of Star Formation in the North America and Pelican Nebulae
Ginsburg, Adam; Bally, John; Stringfellow, Guy S. +3 more
We present observations of near-infrared 2.12 µm molecular hydrogen outflows emerging from 1.1 mm dust continuum clumps in the North America and Pelican Nebula (NAP) complex selected from the Bolocam Galactic Plane Survey (BGPS). Hundreds of individual shocks powered by over 50 outflows from young stars are identified, indicating that the du…
Discovery of a transparent sightline at ρ ≲ 20 kpc from an interacting pair of galaxies
Johnson, Sean D.; Tripp, Todd M.; Prochaska, J. Xavier +3 more
We report the discovery of a transparent sightline at projected distances of ρ ≲ 20 kpc to an interacting pair of mature galaxies at z = 0.12. The sightline of the UV-bright quasar PG 1522+101 at zem = 1.328 passes at ρ = 11.5 kpc from the higher mass galaxy (M* = 1010.6 M⊙) and ρ = 20.4 kpc from the low…
X-Ray Variability and the Inner Region in Active Galactic Nuclei
Mangalam, A.; Mohan, P.
We present theoretical models of X-ray variability attributable to orbital signatures from an accretion disk including emission region size, quasi-periodic oscillations (QPOs), and its quality factor Q, and the emergence of a break frequency in the power spectral density shape. We find a fractional variability amplitude of Fvar\propto M…
Fueling the central engine of radio galaxies. III. Molecular gas and star formation efficiency of 3C 293
Combes, F.; García-Burillo, S.; Neri, R. +6 more
Context. Powerful radio galaxies show evidence of ongoing active galactic nuclei (AGN) feedback, mainly in the form of fast, massive outflows. But it is not clear how these outflows affect the star formation of their hosts.
Aims: We investigate the different manifestations of AGN feedback in the evolved, powerful radio source
Influence of dust loading on atmospheric ionizing radiation on Mars
Gronoff, Guillaume; Mertens, Christopher J.; Norman, Ryan B.
Measuring the radiation environment at the surface of Mars is the primary goal of the Radiation Assessment Detector on the NASA Mars Science Laboratory's Curiosity rover. One of the conditions that Curiosity will likely encounter is a dust storm. The objective of this paper is to compute the cosmic ray ionization in different conditions, including…
Transiting exoplanets from the CoRoT space mission. XXVI. CoRoT-24: a transiting multiplanet system
Mazeh, T.; Aigrain, S.; Alonso, R. +48 more
We present the discovery of a candidate multiply transiting system, the first one found in the CoRoT mission. Two transit-like features with periods of 5.11 and 11.76 d are detected in the CoRoT light curve around a main sequence K1V star of r = 15.1. If the features are due to transiting planets around the same star, these would correspond to obj…
Caught in the act: cluster `k+a' galaxies as a link between spirals and S0s
Rodríguez Del Pino, Bruno; Aragón-Salamanca, Alfonso; Balcells, Marc +3 more
We use integral field spectroscopy of 13 disc galaxies in the cluster AC114 at z ∼ 0.31 in an attempt to disentangle the physical processes responsible for the transformation of spiral galaxies in clusters. Our sample is selected to display a dominant young stellar population, as indicated by strong Hδ absorption lines in their integrated spectra.…
Multiwavelength study of the high-latitude cloud L1642: chain of star formation
Juvela, M.; McGehee, P.; Ristorcelli, I. +16 more
Context. L1642 is one of the two high galactic latitude (|b| > 30°) clouds confirmed to have active star formation.
Aims: We examine the properties of this cloud, especially the large-scale structure, dust properties, and compact sources at different stages of star formation.
Methods: We present high-resolution far-infrared and submil…
Herschel spectral mapping of the Helix nebula (NGC 7293). Extended CO photodissociation and OH+ emission
Barlow, M. J.; Pearson, C.; Cernicharo, J. +13 more
Context. The Helix nebula (NGC 7293) is our closest planetary nebulae. Therefore, it is an ideal template for photochemical studies at small spatial scales in planetary nebulae.
Aims: We aim to study the spatial distribution of the atomic and the molecular gas, and the structure of the photodissociation region along the western rims of the He…
The HST/ACS Coma Cluster Survey - VII. Structure and assembly of massive galaxies in the centre of the Coma cluster
Mobasher, Bahram; Kormendy, John; Balcells, Marc +16 more
We constrain the assembly history of galaxies in the projected central 0.5 Mpc of the Coma cluster by performing structural decomposition on 69 massive (M⋆ ≥ 109 M⊙) galaxies using high-resolution F814W images from the Hubble Space Telescope (HST) Treasury Survey of Coma. Each galaxy is modelled with up to three Sé…