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EVIDENCE FOR A MILD STEEPENING AND BOTTOM-HEAVY INITIAL MASS FUNCTION IN MASSIVE GALAXIES FROM SODIUM AND TITANIUM-OXIDE INDICATORS

The Astrophysical Journal Letters American Astronomical Society 753:2 (2012) l32

Authors:

C Spiniello, SC Trager, LVE Koopmans, YP Chen
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Supernova simulations and strategies for the dark energy survey

Astrophysical Journal 753:2 (2012)

Authors:

JP Bernstein, R Kessler, S Kuhlmann, R Biswas, E Kovacs, G Aldering, I Crane, CB D'Andrea, DA Finley, JA Frieman, T Hufford, MJ Jarvis, AG Kim, J Marriner, P Mukherjee, RC Nichol, P Nugent, D Parkinson, RRR Reis, M Sako, H Spinka, M Sullivan

Abstract:

We present an analysis of supernova light curves simulated for the upcoming Dark Energy Survey (DES) supernova search. The simulations employ a code suite that generates and fits realistic light curves in order to obtain distance modulus/redshift pairs that are passed to a cosmology fitter. We investigated several different survey strategies including field selection, supernova selection biases, and photometric redshift measurements. Using the results of this study, we chose a 30deg2 search area in the griz filter set. We forecast (1) that this survey will provide a homogeneous sample of up to 4000 TypeIa supernovae in the redshift range 0.05
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Supernovae and radio transients in M 82

(2012)

Authors:

S Mattila, M Fraser, SJ Smartt, WPS Meikle, C Romero-Canizales, RM Crockett, A Stephens
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Multiwavelength campaign on Mrk 509: Reverberation of the Fe Kalpha line

(2012)

Authors:

G Ponti, M Cappi, E Costantini, S Bianchi, JS Kaastra, B De Marco, RP Fender, P-O Petrucci, GA Kriss, KC Steenbrugge, N Arav, E Behar, G Branduardi-Raymont, M Dadina, J Ebrero, P Lubinski, M Mehdipour, S Paltani, C Pinto, F Tombesi
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Wide-band simultaneous observations of pulsars: Disentangling dispersion measure and profile variations

Astronomy and Astrophysics 543 (2012)

Authors:

TE Hassall, BW Stappers, JWT Hessels, M Kramer, A Alexov, K Anderson, T Coenen, A Karastergiou, EF Keane, VI Kondratiev, K Lazaridis, J Van Leeuwen, A Noutsos, M Serylak, C Sobey, JPW Verbiest, P Weltevrede, K Zagkouris, R Fender, RAMJ Wijers, L Bähren, ME Bell, JW Broderick, S Corbel, EJ Daw, VS Dhillon, J Eislöffel, H Falcke, JM Grießmeier, P Jonker, C Law, S Markoff, JCA Miller-Jones, R Osten, E Rol, AMM Scaife, B Scheers, P Schellart, H Spreeuw, J Swinbank, S Ter Veen, MW Wise, R Wijnands, O Wucknitz, P Zarka, A Asgekar, MR Bell, MJ Bentum, G Bernardi, P Best, A Bonafede, AJ Boonstra, M Brentjens, WN Brouw, M Brüggen, HR Butcher, B Ciardi, MA Garrett, M Gerbers, AW Gunst, MP Van Haarlem, G Heald, M Hoeft, H Holties, A De Jong, LVE Koopmans, M Kuniyoshi, G Kuper, GM Loose, P Maat, J Masters, JP McKean, H Meulman, M Mevius, H Munk, JE Noordam, E Orrú, H Paas, M Pandey-Pommier, VN Pandey, R Pizzo, A Polatidis, W Reich, H Röttgering, J Sluman, M Steinmetz, CGM Sterks, M Tagger, Y Tang, C Tasse, R Vermeulen, RJ Van Weeren, SJ Wijnholds, S Yatawatta

Abstract:

Dispersion in the interstellar medium is a well known phenomenon that follows a simple relationship, which has been used to predict the time delay of dispersed radio pulses since the late 1960s. We performed wide-band simultaneous observations of four pulsars with LOFAR (at 40-190 MHz), the 76-m Lovell Telescope (at 1400 MHz) and the Effelsberg 100-m Telescope (at 8000 MHz) to test the accuracy of the dispersion law over a broad frequency range. In this paper we present the results of these observations which show that the dispersion law is accurate to better than 1 part in 105 across our observing band. We use this fact to constrain some of the properties of the interstellar medium along the line-of-sight and use the lack of any aberration or retardation effects to determine upper limits on emission heights in the pulsar magnetosphere. We also discuss the effect of pulse profile evolution on our observations, and the implications that it could have for precision pulsar timing projects such as the detection of gravitational waves with pulsar timing arrays. © 2012 ESO.
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