Search Publications
Physical Properties of Spectroscopically Confirmed Galaxies at z >= 6. I. Basic Characteristics of the Rest-frame UV Continuum and Lyα Emission
Ouchi, Masami; Shimasaku, Kazuhiro; Fan, Xiaohui +8 more
We present deep Hubble Space Telescope near-IR and Spitzer mid-IR observations of a large sample of spectroscopically confirmed galaxies at z >= 6. The sample consists of 51 Lyα emitters (LAEs) at z ~= 5.7, 6.5, and 7.0, and 16 Lyman break galaxies (LBGs) at 5.9 <= z <= 6.5. The near-IR images were mostly obtained with WFC3 in the F125W a…
On the association of the ultraluminous X-ray sources in the Antennae galaxies with young stellar clusters
Fabrika, Sergei; Poutanen, Juri; Greiner, Jochen +2 more
The nature of the ultraluminous X-ray sources (ULXs) in the nearby galaxies is a matter of debates. One of the popular hypothesis associates them with accretion at a sub-Eddington rate on to intermediate-mass black holes. Another possibility is a stellar-mass black hole in a high-mass X-ray binary accreting at super-Eddington rates. In this paper,…
The spectroscopic evolution of the γ-ray emitting classical nova Nova Mon 2012. I. Implications for the ONe subclass of classical novae
Cheung, C. C.; Shore, S. N.; Starrfield, S. +4 more
Aims: Among the classical novae, the ONe subgroup, distinguished by their large overabundance of neon, are thought to occur on the most massive white dwarfs. Nova Mon 2012 was the first classical nova to be detected as a high energy γ-ray transient, by Fermi-LAT, before its optical discovery. The first optical spectra obtained about 55 days a…
Gas accretion as a dominant formation mode in massive galaxies from the GOODS NICMOS Survey
Conselice, Christopher J.; Bluck, Asa F. L.; Mortlock, Alice +2 more
The ability to resolve all processes which drive galaxy formation is one of the most fundamental goals in extragalactic astronomy. While star formation rates and the merger history are now measured with increasingly high certainty, the role of gas accretion from the intergalactic medium in supplying gas for star formation still remains largely unk…
Central Stellar Mass Deficits in the Bulges of Local Lenticular Galaxies, and the Connection with Compact z ~ 1.5 Galaxies
Graham, Alister W.; Dullo, Bililign T.
We have used the full radial extent of images from the Hubble Space Telescope's Advanced Camera for Surveys and Wide Field Planetary Camera 2 to extract surface brightness profiles from a sample of six, local lenticular galaxy candidates. We have modeled these profiles using a core-Sérsic bulge plus an exponential disk model. Our fast rotating len…
Intrinsic galaxy shapes and alignments - I. Measuring and modelling COSMOS intrinsic galaxy ellipticities
Schrabback, T.; Hoekstra, H.; Schneider, P. +5 more
The statistical properties of the ellipticities of galaxy images depend on how galaxies form and evolve, and therefore constrain models of galaxy morphology, which are key to the removal of the intrinsic alignment contamination of cosmological weak lensing surveys, as well as to the calibration of weak lensing shape measurements. We construct such…
Beginning of activity in 67P/Churyumov-Gerasimenko and predictions for 2014-2015
Tubiana, C.; Snodgrass, C.; Bramich, D. M. +3 more
Context. Comet 67P/Churyumov-Gerasimenko was selected in 2003 as the new target of the Rosetta mission. It has since been the subject of a detailed campaign of observations to characterise its nucleus and activity.
Aims: We present previously unpublished data taken around the start of activity of the comet in 2007/8, before its last perihelio…
Revealing the Heavily Obscured Active Galactic Nucleus Population of High-redshift 3CRR Sources with Chandra X-Ray Observations
Wilkes, Belinda J.; Fazio, G. G.; Ogle, Patrick +12 more
Chandra observations of a complete, flux-limited sample of 38 high-redshift (1 < z < 2), low-frequency-selected (and so unbiased in orientation) 3CRR radio sources are reported. The sample includes 21 quasars (=broad-line radio galaxies) and 17 narrow-line radio galaxies (NLRGs) with matched 178 MHz radio luminosity (log L R(5 GHz…
Spectroscopic FIR mapping of the disk and galactic wind of M 82 with Herschel-PACS
Lutz, D.; Genzel, R.; Poglitsch, A. +11 more
Context. We present maps of the main cooling lines of the neutral atomic gas ([OI] at 63 and 145 µm and [CII] at 158 µm) and in the [OIII] 88 µm line of the starburst galaxy M 82, carried out with the PACS spectrometer on board the Herschel satellite.
Aims: Our aim is to study the nature of the neutral atomic gas of M 82 and…
Mean Age Gradient and Asymmetry in the Star Formation History of the Small Magellanic Cloud
Anderson, J.; Cignoni, M.; Tosi, M. +5 more
We derive the star formation history (SFH) in four regions of the Small Magellanic Cloud (SMC) using the deepest VI color-magnitude diagrams (CMDs) ever obtained for this galaxy. The images were obtained with the Advanced Camera for Surveys on board the Hubble Space Telescope (HST) and are located at projected distances of 0.°5-2° from the SMC cen…