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Star formation towards the southern cometary H II region IRAS 17256-3631
Chandrasekhar, T.; Vig, S.; Ghosh, S. K. +4 more
IRAS 17256-3631 is a southern Galactic massive star-forming region located at a distance of 2 kpc. In this paper, we present a multiwavelength investigation of the embedded cluster, the H II region, as well as the parent cloud. Radio images at 325, 610 and 1372 MHz were obtained using Giant Metrewave Radio Telescope, India while the near-infrared …
Spectroscopic study of the HgMn star HD 49606: the quest for binarity, abundance stratifications and magnetic field
Giarrusso, M.; Leone, F.; Scalia, C. +4 more
In this paper, we present a multi-instrument analysis of the mercury-manganese star HD 49606. New spectroscopic observations have been obtained by us with Catania Astrophysical Observatory Spectropolarimeter (CAOS@OAC) and High Accuracy Radial Velocity Planet Searcher-North@Telescopio Nazionale Galileo (HARPS-N@TNG). Combining these observations w…
H-ATLAS/GAMA: the nature and characteristics of optically red galaxies detected at submillimetre wavelengths
Cooray, A.; Hony, S.; De Zotti, G. +39 more
We combine Herschel/SPIRE submillimetre (submm) observations with existing multiwavelength data to investigate the characteristics of low-redshift, optically red galaxies detected in submm bands. We select a sample of galaxies in the redshift range 0.01 ≤ z ≤ 0.2, having >5σ detections in the SPIRE 250 µm submm waveband. Sources are then …
Population of post-nova supersoft X-ray sources
Gilfanov, Marat; Bildsten, Lars; Soraisam, Monika D. +1 more
Novae undergo a supersoft X-ray phase of varying duration after the optical outburst. Such transient post-nova supersoft X-ray sources (SSSs) are the majority of the observed SSSs in M31. In this paper, we use the post-nova evolutionary models of Wolf et al. to compute the expected population of post-nova SSSs in M31. We predict that depending on …
The clustering amplitude of X-ray-selected AGN at z ∼ 0.8: evidence for a negative dependence on accretion luminosity
Georgakakis, A.; Salvato, M.; Liu, Z. +5 more
The northern tile of the wide-area and shallow XMM-XXL X-ray survey field is used to estimate the average dark matter halo mass of relatively luminous X-ray-selected active galactic nucleus (AGN) [log {L}_X (2-10 keV)= 43.6^{+0.4}_{-0.4} erg s^{-1}] in the redshift interval z = 0.5-1.2. Spectroscopic follow-up observations of X-ray sources in the …
[Fe II] jets from intermediate-mass protostars in Carina
Smith, Nathan; Bally, John; Reiter, Megan
We present new HST/WFC3-IR narrow-band [Fe II] images of protostellar jets in the Carina Nebula. Combined with five previously published sources, we have a sample of 18 jets and two Herbig-Haro (HH) objects. All of the jets we targeted with Wide-Field Camera 3 (WFC3) show bright infrared [Fe II] emission, and a few Hα candidate jets are confirmed …
High-resolution mapping of dust via extinction in the M31 bulge
Lauer, Tod R.; Wang, Q. D.; Dalcanton, Julianne J. +5 more
We map the dust distribution in the central 180 arcsec (∼680 pc) region of the M31 bulge, based on HST WFC3 and ACS observations in ten bands from near-ultraviolet (2700 Å) to near-infrared (1.5 µm). This large wavelength coverage gives us great leverage to detect not only dense dusty clumps, but also diffuse dusty molecular gas. We fit a pi…
The structure and evolution of a forming galaxy cluster at z = 1.62
Hartley, W. G.; Conselice, C. J.; Almaini, O. +4 more
We present a comprehensive picture of the Cl 0218.3-0510 protocluster at z = 1.623 across 10 comoving Mpc. Using filters that tightly bracket the Balmer and 4000 Å breaks of the protocluster galaxies we obtain precise photometric redshifts resulting in a protocluster galaxy sample that is 89 ± 5 per cent complete and has a contamination of only 12…
The PEP survey: evidence for intense star-forming activity in the majority of radio-selected AGN at z ≳ 1
Berta, S.; Lutz, D.; Popesso, P. +4 more
In order to investigate the far-infrared (FIR) properties of radio-active active galactic nuclei (AGN), we have considered three different fields where both radio and FIR observations are the deepest to date: GOODS-South, GOODS-North and the Lockman Hole. Out of a total of 92 radio-selected AGN, ∼64 per cent are found to have a counterpart in Hers…
Radio variability in the Phoenix Deep Survey at 1.4 GHz
Gaensler, B. M.; Hancock, P. J.; Bell, M. E. +2 more
We use archival data from the Phoenix Deep Survey to investigate the variable radio source population above 1 mJy beam-1 at 1.4 GHz. Given the similarity of this survey to other such surveys we take the opportunity to investigate the conflicting results which have appeared in the literature. Two previous surveys for variability conducte…