Search Publications
The morphologies and masses of extremely red galaxies in the Groth Strip
Cristóbal-Hornillos, D.; López-Sanjuan, C.; Balcells, M. +6 more
We present a new catalogue of EROs from the Groth Strip and study the relation between their morphology and mass. With a selection criterion F814W-Ks≥ 4 and Ks≤ 21.0 we find 102 EROs, over a survey area of 155 arcmin2, leading to a surface density of 0.66 arcmin-2. The photometric data include U, B, F606…
Finding Persistent Sources with the BeppoSAX/Wide Field Camera: An In-depth Analysis
Capitanio, F.; Bird, A. J.; Fiocchi, M. +2 more
During the operational life of the Italian/Dutch X-ray satellite (1996-2002), BeppoSAX, its two Wide Field Cameras (WFCs) performed observations that covered the full sky at different epochs. Although the majority of analysis performed on BeppoSAX WFC data concentrated on the detection of transient sources, we have now applied the same techniques …
The distance and internal composition of the neutron star in EXO 0748-676 with XMM-Newton
Hiemstra, Beike; Méndez, Mariano; Zhang, Guobao +1 more
Recently, the neutron star X-ray binary EXO 0748-676 underwent a transition to quiescence. We analysed an XMM-Newton observation of this source in quiescence, where we fitted the spectrum with two different neutron star atmosphere models. From the fits we constrained the allowed parameter space in the mass-radius diagram for this source for an ass…
Far-infrared Emission from the Intergalactic Medium in Stephan's Quintet Revealed by AKARI
Onaka, Takashi; Kaneda, Hidehiro; Kitayama, Tetsu +1 more
Stephan's Quintet (SQ, HCG92) was observed with the Far-Infrared Surveyor on board AKARI in four far-infrared (IR) bands at 65, 90, 140, and 160 µm. The AKARI four-band images show far-IR emission in the intergalactic medium of SQ. In particular, the 160 µm band image shows single peak emission in addition to the structure extending in…
Identification of new silicate carbon stars
Chen, Pei-Sheng; Shan, Hong-Guang
IRAS low-resolution spectra for 17 sources are presented in this paper. Together with the carbon star catalog, information from recent literatures, the ISO observation and the IRAS two-color diagram, it is found that among them 5 sources are new silicate carbon stars, 5 sources are candidates of silicate carbon stars and other 7 sources are probab…
The Kinematics and Velocity Ellipsoid of the G III Stars
Branham, R. L., Jr.
To study the kinematics of the G giant stars (luminosity class III) use is made of proper motions and parallaxes taken from van Leeuwen's new reduction of the Hipparcos catalog. 3,075 stars, of which 658 have radial velocities, were used in the final study. The solution gives: solar velocity of 16.72±0.41 km s-1; Oort's constant's, in u…
GMRT observations of NGC 2997 and radio detection of the circumnuclear ring
Ananthakrishnan, S.; Kantharia, N. G.; Kodilkar, J.
We present high-resolution, high-sensitivity radio continuum observations of the nearby spiral galaxy NGC 2997 at 332, 616 and 1272 MHz using the Giant Metrewave Radio Telescope (GMRT). The integrated spectrum of this galaxy has a spectral index of -0.92 (Sν ∝ να) and we place an upper limit to the thermal fraction at 1272 MH…
Multiwavelength study of the intriguing massive star CPD--59 2629 (Tr 16-22)
Gamen, R.; Combi, J. A.; Romero, G. E. +8 more
We report preliminary results of a multi-wavelength (radio-optical-X-ray) study of the massive star CPD -59 2629 (Tr 16-22) in the Carina Nebula (NGC 3372). This star has historically shown a large X-ray excess (log L_{X}/L_{bol} < -6 or even larger), which is one order of magnitude larger than expected from single massive O-type stars. A colli…
Discovery of the infrared counterpart of CXOU J174437.3-323222 in the field of IGR J17448-3232: a blazar candidate viewed through the Galactic Centre?
Maccarone, T. J.; Chaty, S.; Tomsick, J. A. +2 more
We present our near-infrared ESO-NTT KS band observations of the field of IGR J17448-3232 which show no extended emission consistent with the supernova remnant (SNR), but in which we identify a new counterpart, also visible in Spitzer images up to 24 µm, at the position of the X-ray point source, CXOU J174437.3-323222. Multiwavele…
About the measurements of the hard X-ray background
Pozanenko, A. S.; Bisnovatyi-Kogan, G. S.
We analyze uncertainties in the cosmic X-ray background measurements performed by the INTEGRAL observatory. We find that the most important effect limiting the accuracy of the measurements is related to the intrinsic background variation in detectors. Taking into account all of the uncertainties arising during the measurements we conclude that the…