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The VIMOS-VLT Deep Survey. Galaxy luminosity function per morphological type up to z = 1.2
Bondi, M.; Maccagni, D.; Ilbert, O. +47 more
Aims.We have computed the evolution of the rest-frame B-band luminosity function (LF) for bulge and disk-dominated galaxies since z=1.2.
Methods: .We use a sample of 605 spectroscopic redshifts with IAB≤ 24 in the Chandra Deep Field South from the VIMOS-VLT Deep Survey, 3555 galaxies with photometric redshifts from the COMBO-17 mult…
Are GRB980425 and GRB031203 real outliers or twins of GRB060218?
Ghirlanda, G.; Ghisellini, G.; Mereghetti, S. +3 more
GRB980425 and GRB031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy Eiso emitted in the prompt radiation phase and the peak frequency Epeak of the spectrum in a νFν representation (the so-called Amati relation). We discuss if these two bursts are really differ…
Formation of Inner Structure of a Reconnection Separatrix Region
Nilsson, H.; André, M.; Vaivads, A. +3 more
We present multipoint spacecraft observations at the dayside magnetopause of a magnetic reconnection separatrix region. This region separates two plasmas with significantly different temperatures and densities, at a large distance from the X line. We identify which terms in the generalized Ohm’s law balance the observed electric field throughout t…
Extragalactic H_2O masers and X-ray absorbing column densities
Kadler, M.; Henkel, C.; Wilson, A. S. +4 more
Having conducted a search for the λ 1.3 cm (22 GHz) water vapor line towards galaxies with nuclear activity, large nuclear column densities or high infrared luminosities, we present H2O spectra for NGC 2273, UGC 5101, and NGC 3393 with isotropic luminosities of 7, 1500, and 400 L⊙. The H2O maser in UGC 5101 is by far the most luminous y…
Thin Current Sheets in the Magnetotail Observed by Cluster
Nakamura, R.; Baumjohann, W.; Asano, Y. +1 more
The dynamics of the current sheet is one of the most essential elements in magnetotail physics. Particularly, thin current sheets, which we define here as those with a thickness of less than several ion inertia lengths, are known to play an important role in the energy conversion process in the magnetotail. With its capability of multi-point obser…
Locations of Atmospheric Photoelectron Energy Peaks Within the Mars Environment
Coates, A. J.; Kallio, E.; Barabash, S. +13 more
By identifying peaks in the photoelectron spectrum produced by photoionization of CO2 in the Martian atmosphere, we have conducted a pilot study to determine the locations of these photoelectrons in the space around Mars. The significant result of this study is that these photoelectrons populate a region around Mars bounded externally b…
XTE J1739-302 as a Supergiant Fast X-Ray Transient
Negueruela, I.; Swank, J. H.; Markwardt, C. B. +4 more
XTE J1739-302 is a transient X-ray source with unusually short outbursts, lasting on the order of hours. Here we give a summary of X-ray observations we have made of this object in outburst with the Rossi X-Ray Timing Explorer (RXTE) and at a low level of activity with the Chandra X-Ray Observatory, as well as observations made by other groups. Vi…
Discovery of a Population of Pre-Main-Sequence Stars in NGC 346 from Deep Hubble Space Telescope ACS Images
Tosi, M.; Sabbi, E.; Nota, A. +9 more
We report the discovery of a rich population of low-mass stars in the young, massive NGC 346 star-forming region in the Small Magellanic Cloud from deep V, I, and Hα images taken with the Hubble Space Telescope Advanced Camera for Surveys. These stars have likely formed together with the NGC 346 cluster, ~=3-5 Myr ago. Their magnitudes and colors …
Evolution of the Color-Magnitude Relation in High-Redshift Clusters: Blue Early-Type Galaxies and Red Pairs in RDCS J0910+5422
Demarco, R.; Infante, L.; Zheng, W. +43 more
The color-magnitude relation has been determined for the RDCS J0910+5422 cluster of galaxies at redshift z=1.106. Cluster members were selected from the Hubble Space Telescope Advanced Camera for Surveys (HST ACS) images, combined with ground-based near-IR imaging and optical spectroscopy. The observed early-type color-magnitude relation (CMR) in …
The black hole in NGC 3379: a comparison of gas and stellar dynamical mass measurements with HST and integral-field data
Shapiro, Kristen L.; Gebhardt, Karl; Cappellari, Michele +4 more
We combine Hubble Space Telescope spectroscopy and ground-based integral-field data from the SAURON and OASIS instruments to study the central black hole in the nearby elliptical galaxy NGC 3379. From these data, we obtain kinematics of both the stars and the nuclear gaseous component. Axisymmetric three-integral models of the stellar kinematics f…