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Height-dependent Velocity Structure of Photospheric Convection in Granules and Intergranular Lanes with Hinode/SOT
Shimizu, T.; Oba, T.; Iida, Y.
The solar photosphere is the visible surface of the Sun, where many bright granules, surrounded by narrow dark intergranular lanes, are observed everywhere. The granular pattern is a manifestation of convective motion at the photospheric level, but its velocity structure in the height direction is poorly understood observationally. Applying bisect…
The First Data Release of the Beijing-Arizona Sky Survey
Fan, Xiaohui; Jiang, Linhua; Cai, Zheng +25 more
The Beijing-Arizona Sky Survey (BASS) is a new wide-field legacy imaging survey in the northern Galactic cap using the 2.3 m Bok telescope. The survey will cover about 5400 deg2 in the g and r bands, and the expected 5σ depths (corrected for the Galactic extinction) in these two bands are g = 24.0 and r = 23.4 mag (AB magnitude). BASS s…
The SCUBA-2 850 µm Follow-up of WISE-selected, Luminous Dust-obscured Quasars
Knudsen, Kirsten K.; Fan, Lulu; Han, Yunkun +1 more
Hot dust-obscured galaxies (Hot DOGs) are a new population recently discovered in the Wide-field Infrared Survey Explorer All-Sky survey. Multiwavelength follow-up observations suggest that they are luminous, dust-obscured quasars at high redshift. Here we present the JCMT SCUBA-2 850 µm follow-up observations of 10 Hot DOGs. Four out of ten…
Quasar spectral variability from the XMM-Newton serendipitous source catalogue
Middei, R.; Vagnetti, F.; Serafinelli, R.
Context. X-ray spectral variability analyses of active galactic nuclei (AGN) with moderate luminosities and redshifts typically show a "softer when brighter" behaviour. Such a trend has rarely been investigated for high-luminosity AGNs (Lbol ≳ 1044 erg/s), nor for a wider redshift range (e.g. 0 ≲ z ≲ 5).
Aims: We present…
Nuclear absorption and emission in the AGN merger NGC 6240 : the hard X-ray view
Nardini, Emanuele
We present the analysis of four NuSTAR observations of the luminous infrared galaxy merger NGC 6240 , hosting a close pair of highly obscured active galactic nuclei (AGNs). Over a period of about 2 yr, the source exhibits hard X-ray variability of the order of 20 per cent, peaking around 20 keV. When the two AGNs are resolved with Chandra , column…
Close-up images of the final Philae landing site on comet 67P/Churyumov-Gerasimenko acquired by the ROLIS camera
Bibring, J. -P.; Jaumann, R.; Keller, H. U. +11 more
After coming to rest on the night side of comet 67P/Churyumov-Gerasimenko, the ROLIS camera on-board Rosetta's Philae lander acquired five images of the surface below the lander, four of which were with the aid of LED illumination of different colors. The images confirm that Philae was perched on a sloped surface. A local horizon is visible in one…
Understanding the environment around the intermediate mass black hole candidate ESO 243-49 HLX-1
Maccarone, T. J.; Graham, Alister W.; Combes, F. +12 more
Aims: ESO 243-49 HLX-1, otherwise known as HLX-1, is an intermediate mass black hole (IMBH) candidate located 8'' (3.7 Kpc) from the centre of the edge-on S0 galaxy ESO 243-49. How the black hole came to be associated with this galaxy, and the nature of the environment in which it resides, remain unclear. Using multi-wavelength observations w…
Growth of Bulges in Disk Galaxies Since z ∼ 1
Sachdeva, Sonali; Saha, Kanak; Singh, Harinder P.
We investigate the growth of bulges in bright ({M}B< -20) disk galaxies since z∼ 1, in rest-frame B and I-band, using images from HST ACS and WFC3 in GOODS-South for high redshifts (0.4< z< 1.0) and SDSS for local (0.02< z< 0.05). The growth history has been traced by performing two-component bulge-disk decomposition and …
The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite
Viel, Matteo; Sijacki, Debora; Kim, Tae-Sun +4 more
We study the effect of different feedback prescriptions on the properties of the low-redshift (z ≤ 1.6) Lyα forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback, active galactic nuclei (AGN) feedback and a simplified scheme for efficiently modelling the low co…
Molecular Outflows: Explosive versus Protostellar
Palau, Aina; Zapata, Luis A.; Rodríguez, Luis F. +2 more
With the recent recognition of a second, distinctive class of molecular outflows, namely the explosive ones not directly connected to the accretion-ejection process in star formation, a juxtaposition of the morphological and kinematic properties of both classes is warranted. By applying the same method used in Zapata et al., and using 12