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A Measurement of Diffusion in 47 Tucanae
Richer, Harvey B.; Heyl, Jeremy; Kalirai, Jason +4 more
Using images from the Hubble Space Telescope Wide-Field Camera 3, we measure the rate of diffusion of stars through the core of the globular cluster 47 Tucanae (47 Tuc) using a sample of young white dwarfs that were identified in these observations. This is the first direct measurement of diffusion due to gravitational relaxation. We find that the…
Limits on the fluctuating part of y-type distortion monopole from Planck and SPT results
Khatri, Rishi; Sunyaev, Rashid
We use the published Planck and SPT cluster catalogs [1,2] and recently published y-distortion maps [3] to put strong observational limits on the contribution of the fluctuating part of the y-type distortions to the y-distortion monopole. Our bounds are 5.4× 10-8 < ⟨ y⟩ < 2.2× 10-6. Our upper bound is a factor of 6.8 st…
A GALEX-based Search for the Sparse Young Stellar Population in the Taurus-Aurigae Star Forming Region
Gómez de Castro, Ana I.; López-Martínez, Fatima; Sánchez, Néstor +5 more
In this work, we identify 63 bona fide new candidates to T Tauri stars (TTSs) in the Taurus-Auriga region, using its ultraviolet excess as our baseline. The initial data set was defined from the GALEX all sky survey (AIS). The GALEX satellite obtained images in the near-ultraviolet (NUV) and far-ultraviolet (FUV) bands where TTSs show a prominent …
A blind CO detection of a distant red galaxy in the HS1700+64 protocluster.
Smail, I.; Ivison, R. J.; Gurwell, M. +7 more
We report the blind detection of 12CO emission from a distant red galaxy, HS1700.DRG55. We have used the IRAM Plateau de Bure Interferometer WideX, with its 3.6 GHz of instantaneous dual-polarization bandwidth, to target 12CO(3-2) from galaxies lying in the protocluster at z = 2.300 in the field HS1700+64. If indeed this line…
A divergence-free parametrization for dynamical dark energy
Akarsu, Özgür; Dereli, Tekin; Vazquez, J. Alberto
We introduce a new parametrization for the dark energy, led by the same idea to the linear expansion of the equation of state in scale factor a and in redshift z, which diverges neither in the past nor future and contains the same number of degrees of freedom with the former two. We present constraints of the cosmological parameters using the most…
Co-evolution of black hole growth and star formation from a cross-correlation analysis between quasars and the cosmic infrared background
Ross, Nicholas P.; Wang, Wenting; Han, Jiaxin +19 more
We present the first cross-correlation measurement between Sloan Digital Sky Survey type 1 quasars and the cosmic infrared background (CIB) measured by Herschel. The quasars cover the redshift range 0.15 < z < 3.5 where most of the CIB originates. We detect the sub-millimetre emission of the quasars, which dominates on small scales, and corr…
HH 666: different kinematics from H α and [Fe II] emission provide a missing link between jets and outflows
Smith, Nathan; Bally, John; Reiter, Megan +1 more
HH 666 is an externally irradiated protostellar outflow in the Carina nebula for which we present new near-IR [Fe II] spectra obtained with the Folded-Port Infrared Echellette spectrograph at Magellan Observatory. Earlier H α and near-IR [Fe II] imaging revealed that the two emission lines trace substantially different morphologies in the inner ∼4…
On the Enhanced Coronal Mass Ejection Detection Rate since the Solar Cycle 23 Polar Field Reversal
Petrie, G. J. D.
Compared to cycle 23, coronal mass ejections (CMEs) with angular widths >30° have been observed to occur at a higher rate during solar cycle 24, per sunspot number. This result is supported by data from three independent databases constructed using Large Angle and Spectrometric Coronagraph Experiment coronagraph images, two employing automated …
Smoke in the Pipe Nebula: dust emission and grain growth in the starless core FeSt 1-457
Alves, João; Forbrich, Jan; Lada, Charles J. +2 more
Context. The availability of submillimeter dust emission data in an unprecedented number of bands provides us with new opportunities to investigate the properties of interstellar dust in nearby clouds.
Aims: The nearby Pipe Nebula is an ideal laboratory to study starless cores. We here aim to characterize the dust properties of the FeSt 1-457…
XMMFITCAT: The XMM-Newton spectral-fit database
Georgantopoulos, I.; Watson, M. G.; Webb, N. A. +3 more
The XMM-Newton spectral-fit database (XMMFITCAT) is a catalogue of spectral fitting results for the source detections within the XMM-Newton serendipitous source catalogue with more than 50 net (background-subtracted) counts per detector in the 0.5-10 keV energy band. Its most recent version, constructed from the latest version of the XMM-Newton ca…