This manuscript presents information for all supernovae discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) during 2015, its second full year of operations. The same information is presented for bright (m(V) <= 17), spectroscopically confirmed supernovae discovered by other sources in 2015. As with the first ASAS-SN bright supernova catalogue, we also present redshifts and near-ultraviolet through infrared magnitudes for all supernova host galaxies in both samples. Combined with our previous catalogue, this work comprises a complete catalogue of 455 supernovae from multiple professional and amateur sources, allowing for population studies that were previously impossible. This is the second of a series of yearly papers on bright supernovae and their hosts from the ASAS-SN team.

No description available.

No description available.

A review is presented of the major cancer surveys conducted in trans-Saharan Africa since the end of the First World War, starting with the more numerous relative ratio or frequency studies before proceeding to the four recent incidence rate surveys which have taken place in Johannesburg, Kivu and Ruanda Urundi, Kampala, and Lourenco Marques. An account is then given of the three years cancer incidence rate survey in Ibadan, Nigeria, which extended from April 1960 until the end of March 1963. In describing the organisation and running of the Ibadan survey particular attention is paid to a number of sociological studies designed to elucidate special local circumstances which might be affecting the validity of the eventual results. One of these subsidiary surveys was concerned with the attitude of the population towards modern medical facilities and the extent of their continued reliance upon traditional modes of treatment. Studies of prominent local tumours made in the course of the main survey also receive individual mention. Among them was an attempt to assess the prevalence of Kaposi's Sarcome throughout Nigeria, an exercise which served to demonstrate the complexities of epidemiology in such a setting. The incidence rate survey in the town of Ibadan showed low crude annual rates of approximately 45 per 100:000 of the population for all cancers in both sexes. However, during much of their life span Ibadan people seem to have age specific cancer incidence rates which are only slightly lower than those of the U.S.A., with the notable exceptions of the 5 - 9 age group and the over-fifties. Young male children have a very high incidence of the Burkitt Tumour, making the overall rates for this age much higher than those in the United States whilst in older people in Ibadan the cancer incidence rate, which had been rising with age, falls off steeply. Apart from the Burkitt Tumour and tumours of the reticulo-endothelial system generally, the striking feature of the Ibadan cancer scene is the high incidence of primary liver celled carcinoma among males. Finally, attention is drawn to the unsatisfactory nature of relative ratio surveys in a continent with rapidly developing medical services and suggestions are made regardint the interpretation of some of the Ibadan incidence survey results. It is emphasised that caution must still be exercised even when considering cancer incidence rates if these have been based entirely upon hospital diagnosed cases, drawn from a population whose ages are not accurately known and whose elderly members may be disinclined to come to hospital.

We report the discovery, tracking, and detection circumstances for 85 trans-Neptunian objects (TNOs) from the first 42 deg(2) of the Outer Solar System Origins Survey. This ongoing r-band solar system survey uses the 0.9 deg(2) field of view MegaPrime camera on the 3.6m Canada-France-Hawaii Telescope. Our orbital elements for these TNOs are precise to a fractional semimajor axis uncertainty <0.1%. We achieve this precision in just two oppositions, as compared to the normal three to five oppositions, via a dense observing cadence and innovative astrometric technique. These discoveries are free of ephemeris bias, a first for large trans-Neptunian surveys. We also provide the necessary information to enable models of TNO orbital distributions to be tested against our TNO sample. We confirm the existence of a cold "kernel" of objects within the main cold classical Kuiper Belt and infer the existence of an extension of the "stirred" cold classical Kuiper Belt to at least several au beyond the 2:1 mean motion resonance with Neptune. We find that the population model of Petit et al. remains a plausible representation of the Kuiper Belt. The full survey, to be completed in 2017, will provide an exquisitely characterized sample of important resonant TNO populations, ideal for testing models of giant planet migration during the early history of the solar system.

We present the Data Release 12 Quasar catalog (DR12Q) from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III. This catalog includes all SDSS-III /BOSS objects that were spectroscopically targeted as quasar candidates during the full survey and that are confirmed as quasars via visual inspection of the spectra, have luminosities Mi[z = 2] < -20.5 (in a Lambda CDM cosmology with H-0 = 70 km s (1) Mpc (1), Omega(M) = 0 : 3, and Omega(A) = 0.7), and either display at least one emission line with a full width at half maximum (FWHM) larger than 500 km s (1) or, if not, have interesting /complex absorption features. The catalog also includes previously known quasars (mostly from SDSS-I and II) that were reobserved by BOSS. The catalog contains 297 301 quasars (272 026 are new discoveries since the beginning of SDSSIII) detected over 9376 deg(2) with robust identification and redshift measured by a combination of principal component eigenspectra. The number of quasars with z > 2.15 (184 101, of which 167 742 are new discoveries) is about an order of magnitude greater than the number of z > 2 : 15 quasars known prior to BOSS. Redshifts and FWHMs are provided for the strongest emission lines (C iv, C III], Mg II). The catalog identifies 29 580 broad absorption line quasars and lists their characteristics. For each object, the catalog presents five-band (u, g, r, i, z) CCD-based photometry with typical accuracy of 0.03 mag together with some information on the optical morphology and the selection criteria. When available, the catalog also provides information on the optical variability of quasars using SDSS and Palomar Transient Factory multi-epoch photometry. The catalog also contains X-ray, ultraviolet, near-infrared, and radio emission properties of the quasars, when available, from other large-area surveys. The calibrated digital spectra, covering the wavelength region 3600-10 500 a at a spectral resolution in the range 1300 < R < 2500, can be retrieved from the SDSS Catalog Archive Server. We also provide a supplemental list of an additional 4841 quasars that have been identified serendipitously outside of the superset defined to derive the main quasar catalog.

No description available.

No description available.

Call number: LD2668 .P7 1974 C55

We describe the execution and data reduction of the European Southern Observatory Large Programme "Quasars and their absorption lines: a legacy survey of the high-redshift Universe with VLT/X-shooter" (hereafter "XQ-100"). XQ-100 has produced and made publicly available a homogeneous and high-quality sample of echelle spectra of 100 quasars (QSOs) at redshifts z similar or equal to 3.5-4.5 observed with full spectral coverage from 315 to 2500 nm at a resolving power ranging from R similar to 4000 to 7000, depending on wavelength. The median signal-to-noise ratios are 33, 25 and 43, as measured at rest-frame wavelengths 1700, 3000 and 3600 angstrom, respectively. This paper provides future users of XQ-100 data with the basic statistics of the survey, along with details of target selection, data acquisition and data reduction. The paper accompanies the public release of all data products, including 100 reduced spectra. XQ-100 is the largest spectroscopic survey to date of high-redshift QSOs with simultaneous rest-frame UV/optical coverage, and as such enables a wide range of extragalactic research, from cosmology and galaxy evolution to AGN astrophysics.