Search Publications
Deep rest-frame far-UV spectroscopy of the giant Lyman α emitter `Himiko'
Nørgaard-Nielsen, H. U.; Fynbo, J. P. U.; Ouchi, M. +3 more
We present deep 10 h VLT/XSHOOTER spectroscopy for an extraordinarily luminous and extended Ly α emitter at z = 6.595 referred to as Himiko and first discussed by Ouchi et al., with the purpose of constraining the mechanisms powering its strong emission. Complementary to the spectrum, we discuss near-infrared imaging data from the CANDELS survey. …
New members of the TW Hydrae Association and two accreting M-dwarfs in Scorpius-Centaurus
Murphy, Simon J.; Bento, Joao; Lawson, Warrick A.
We report the serendipitous discovery of several young mid-M stars found during a search for new members of the 30-40 Myr-old Octans Association. Only one of the stars may be considered a possible Octans(-Near) member. However, two stars have proper motions, kinematic distances, radial velocities, photometry and Li I λ6708 measurements consistent …
A CO-rich merger shaping a powerful and hyperluminous infrared radio galaxy at z = 2: the Dragonfly Galaxy
Pentericci, L.; Colina, L.; Villar-Martín, M. +17 more
In the low-redshift Universe, the most powerful radio sources are often associated with gas-rich galaxy mergers or interactions. We here present evidence for an advanced, gas-rich (`wet') merger associated with a powerful radio galaxy at a redshift of z ∼ 2. This radio galaxy, MRC 0152-209, is the most infrared-luminous high-redshift radio galaxy …
The 11.2 µm emission of PAHs in astrophysical objects
Sarre, P. J.; Candian, A.
The 11.2-µm emission band belongs to the family of the `unidentified' infrared emission bands seen in many astronomical environments. In this work, we present a theoretical interpretation of the band characteristics and profile variation for a number of astrophysical sources in which the carriers are subject to a range of physical conditions…
Ongoing growth of the brightest cluster galaxies via major dry mergers in the last ∼6 Gyr
Liu, F. S.; Meng, X. M.; Lei, F. J. +1 more
Brightest cluster galaxies (BCGs) might have been assembled relatively late (z < 1) via mergers. By exploiting the high-resolution HST/ACS imaging, we find four BCGs (COSMOS-P 125516, 102810, 036694 and 089357) in major dry merging in 29 X-ray clusters at 0.3 ≤ z ≤ 0.6 in the Cosmological Evolutionary Survey (COSMOS). These BCGs show prominent …
Confirming HD 23478 as a new magnetic B star hosting an Hα-bright centrifugal magnetosphere
Wade, G. A.; Bohlender, D. A.; Neiner, C. +11 more
In this paper, we report 23 magnetic field measurements of the B3IV star HD 23478: 12 obtained from high-resolution Stokes V spectra using the ESPaDOnS (Canada-France-Hawaii Telescope) and Narval (Télescope Bernard Lyot) spectropolarimeters, and 11 from medium-resolution Stokes V spectra obtained with the DimaPol spectropolarimeter (Dominion Astro…
Large-scale environment of z ∼ 5.7 C IV absorption systems -II. Spectroscopy of Lyman α emitters
Ouchi, Masami; Koyama, Yusei; Díaz, C. Gonzalo +2 more
The flow of baryons to and from a galaxy, which is fundamental for galaxy formation and evolution, can be studied with galaxy-metal absorption system pairs. Our search for galaxies around C IV absorption systems at z ∼ 5.7 showed an excess of photometric Lyman α emitter (LAE) candidates in the fields J1030+0524 and J1137+3549. Here, we present spe…
Variations in the cyclotron resonant scattering features during 2011 outburst of 4U 0115+63
Dewangan, G. C.; Bhattacharya, D.; Mukherjee, D. +2 more
We study the variations in the Cyclotron Resonant Scattering Feature (CRSF) during 2011 outburst of the high mass X-ray binary 4U 0115+63 using observations performed with Suzaku, RXTE, Swift and INTEGRAL satellites. The wide-band spectral data with low-energy coverage allowed us to characterize the broad-band continuum and detect the CRSFs. We fi…
Chandra and XMM monitoring of the black hole X-ray binary IC 10 X-1
Laycock, Silas G. T.; Cappallo, Rigel C.; Moro, Matthew J.
The massive black hole (BH)+Wolf-Rayet (WR) binary IC 10 X-1 was observed in a series of 10 Chandra and two XMM-Newton observations spanning 2003-2012, showing consistent variability around 7 × 1037 erg s-1, with a spectral hardening event in 2009. We phase connected the entire light curve by folding the photon arrival times …
Radio haloes in Sunyaev-Zel'dovich-selected clusters of galaxies: the making of a halo?
Sommer, M.; Cassano, R.; Vazza, F. +8 more
Radio haloes are synchrotron radio sources detected in some massive galaxy clusters. Their size of Mpc indicates that (re)acceleration processes are taking place in the host cluster. X-ray catalogues of galaxy clusters have been used in the past to search for radio haloes and to understand their connection with cluster-cluster mergers and with the…