نتایج جستجو برای: 33 m
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Context. Over the past few years several studies have provided estimates of the SFR (star-formation rate) or the total infrared luminosity from just one infrared band. However these relations are generally derived for entire galaxies, which are known to contain a large scale diffuse emission that is not necessarily related to the latest star-formation episode. Aims. We provide new relations to ...
The nearby galaxy M33 was observed by the imaging X-ray instruments on-board BeppoSAX. Two observations at different phases of the 105.9 day intensity cycle of the luminous central source X-8 failed to reveal the expected modulation, suggesting that it is probably transitory. Similar behavior has been observed from several X-ray binary sources. This strengthens somewhat the idea that M33 X-8 is...
We explore the formation and evolution of the black hole X-ray binary system M33 X-7. In particular, we examine whether accounting for systematic errors in the stellar parameters inherent to single star models, as well as the uncertainty in the distance to M33, can explain the discrepancy between the observed and expected luminosity of the ∼ 70M⊙ companion star. Our analysis assumes no prior in...
Aims. We investigate the energy sources of the infrared (IR) emission and their relation to the radio continuum emission at various spatial scales within the Scd galaxy M33. Methods. We use the data at the Spitzer wavelengths of 24, 70, and 160μm, as well as recent radio continuum maps at 3.6 cm and 20 cm observed with the 100–m Effelsberg telescope and VLA, respectively. We use the wavelet tra...
Luminous blue variables (LBVs) are a class of highly unstable stars that have been proposed to play a critical role in massive stellar evolution as well as being the progenitors of some of the most luminous supernovae known. However the physical processes underlying their characteristic instabilities are currently unknown. In order to provide observational constraints on this behaviour we have ...
We present the result of a survey for star clusters in M33 using the HST/WFPC2 archive images. We have found 104 star clusters, including 32 new ones, in the images of 24 fields that were not included in the previous studies. Combining these with previous data in the literature, we increase the number of M33 star clusters found in the HST images to 242. We have derived BV I integrated photometr...
This study aimed to determine the occurrence of Mycobacterium avium complex and other nontuberculous mycobacteria in drinking-water in Basra governorate, Iraq and their susceptibility to several antibiotics and the effect of 0.5 mg/L of chlorine on their survival. A total of 404 samples of drinking-water were collected from 33 different districts of the governorate from November 2006 to August ...
B. Abbott,56 A. Abdesselam,11 M. Abolins,49 V. Abramov,24 B. S. Acharya,16 D. L. Adams,58 M. Adams,36 G. A. Alves,2 N. Amos,48 E. W. Anderson,41 R. Astur,53 M. M. Baarmand,53 V. V. Babintsev,24 L. Babukhadia,53 T. C. Bacon,26 A. Baden,45 B. Baldin,35 P. W. Balm,19 S. Banerjee,16 E. Barberis,28 P. Baringer,42 J. F. Bartlett,35 U. Bassler,12 D. Bauer,26 A. Bean,42 M. Begel,52 A. Belyaev,23 S. B. ...
A comparative XMM-Newton archival data spectral study of the ultraluminous Xray source (ULX) M33 X-8 has been performed by using both the standard disk model and the newly developed slim disk models. The results of this analysis tend to confirm the hypothesis that M33 X-8 is an X-ray binary with a stellar-mass black hole accreting at super-Eddington rate.
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