Search Publications
AGN-host connection at 0.5 < z < 2.5: A rapid evolution of AGN fraction in red galaxies during the last 10 Gyr
Wuyts, S.; Daddi, E.; Elbaz, D. +13 more
We explore the dependence of the incidence of moderate-luminosity (L0.5-8 keV = 1041.9-43.7 erg s-1) active galactic nuclei (AGNs) and the distribution of their accretion rates on host color at 0.5 <z < 2.5. Based on the deepest X-ray and UV-to-far-infrared data in the two The Great Observatories Origins Deep…
An X-Ray Periodicity of ∼1.8 hr in Narrow-line Seyfert 1 Galaxy Mrk 766
Zhang, Peng; Zhang, Peng-fei; Yan, Jing-zhi +2 more
In the narrow-line Seyfert 1 galaxy Mrk 766, a quasi-periodic oscillation (QPO) signal with a period of ∼6450 s is detected in the XMM-Newton data collected on 2005 May 31. This QPO signal is highly statistically significant at the ∼5σ confidence level, with a quality factor of Q=f/{{Δ }}f> 13.6. The X-ray intensity changed by a factor of 3, wi…
Mapping the Extinction Curve in 3D: Structure on Kiloparsec Scales
Peek, J. E. G.; Schlafly, E. F.; Finkbeiner, D. P. +1 more
Near-infrared spectroscopy from APOGEE and wide-field optical photometry from Pan-STARRS1 have recently made precise measurements of the shape of the extinction curve possible for tens of thousands of stars, parameterized by R(V). These measurements revealed structures in R(V) with large angular scales, which are challenging to explain in existing…
UVUDF: UV Luminosity Functions at the Cosmic High Noon
Gardner, Jonathan P.; Teplitz, Harry I.; Scarlata, Claudia +14 more
We present the rest-1500 Å UV luminosity functions (LF) for star-forming galaxies during the cosmic high noon—the peak of cosmic star formation rate at 1.5< z< 3. We use deep NUV imaging data obtained as part of the Hubble Ultra-Violet Ultra Deep Field (UVUDF) program, along with existing deep optical and NIR coverage on the HUDF. We select …
The structural and size evolution of star-forming galaxies over the last 11 Gyr
Sobral, David; Buitrago, Fernando; Afonso, José +1 more
We present new results on the evolution of rest-frame blue/UV sizes and Sérsic indices of Hα-selected star-forming galaxies over the last 11 Gyr. We investigate how the perceived evolution can be affected by a range of biases and systematics such as cosmological dimming and resolution effects. We use GALFIT and an artificial redshifting technique,…
Linear and non-linear Modified Gravity forecasts with future surveys
Kunz, Martin; Pettorino, Valeria; Martinelli, Matteo +1 more
Modified Gravity theories generally affect the Poisson equation and the gravitational slip in an observable way, that can be parameterized by two generic functions (η and µ) of time and space. We bin their time dependence in redshift and present forecasts on each bin for future surveys like Euclid. We consider both Galaxy Clustering and Weak…
An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z = 3.717 “Passive” System, ZF 20115
Ivison, R. J.; Smail, Ian; Dunlop, J. S. +28 more
The identification of high-redshift, massive galaxies with old stellar populations may pose challenges to some models of galaxy formation. However, to securely classify a galaxy as quiescent, it is necessary to exclude significant ongoing star formation, something that can be challenging to achieve at high redshifts. In this Letter, we analyze dee…
Observations of the Lyman series forest towards the redshift 7.1 quasar ULAS J1120+0641
Hewett, P. C.; Warren, S. J.; Simpson, C. +5 more
We present a 30 h integration Very Large Telescope X-shooter spectrum of the Lyman series forest towards the z = 7.084 quasar ULAS J1120+0641. The only detected transmission at S/N > 5 is confined to seven narrow spikes in the Lyα forest, over the redshift range 5.858 <z < 6.122, just longward of the wavelength of the onset of the Lyβ for…
Characteristics of Solar Energetic Ions as a Function of Longitude
Cohen, C. M. S.; Mewaldt, R. A.; Mason, G. M.
Since the 2006 launch of STEREO, multi-spacecraft studies have yielded several surprising results regarding the spread of solar energetic particles (SEPs) within the inner heliosphere. We have investigated the role of energy and ridigity, using ACE and STEREO 10 MeV n-1 oxygen data to identify 41 large SEP events observed by two or thre…
The effects of the cluster environment on the galaxy mass-size relation in MACS J1206.2-0847
Häußler, B.; Ziegler, B.; Verdugo, M. +2 more
The dense environment of galaxy clusters strongly influences the nature of galaxies. Their abundance and diversity is imprinted on the stellar-mass-size plane. Here, we study the cause of the size distribution of a sample of 560 spectroscopic members spanning a wide dynamical range down to 108.5M⊙ (log (M)-2) in the massive C…