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The 1-100 pc region embedding long-duration gamma-ray bursts (lGRBs) has been hitherto unexplored, as extremely high ionisation by the GRB prevents application of optical absorption spectroscopy on such distances. We show that the GRB…

Massive objects (clumps) of Cold Dark Matter (CDM) in Galaxy can appear due to its annihilation as discrete sources of gamma-radiation. Some number of unidentified regular gamma-sources, observed by EGRET, can be accounted for by massive…

天体物理学 · 物理学 2007-05-23 K. M. Belotsky , A. M. Galper

The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way at a distance of approximately 48 kpc. Despite its distance it harbours several interesting targets for TeV gamma-ray observations. The composite supernova remnant N…

高能天体物理现象 · 物理学 2019-08-14 Nu. Komin , A. Djannati-Ataï , Y. Gallant , V. Marandon , C. C. Lu , S. Ohm , E. de Oña Wilhelmi

We analyse 850um continuum observations of eight massive X-ray detected galaxy clusters at z~0.8-1.6 taken with SCUBA-2 on the James Clerk Maxwell Telescope. We find an average overdensity of 850um-selected sources of a factor of 4+/-2 per…

星系天体物理 · 物理学 2019-04-10 E. A. Cooke , Ian Smail , S. M. Stach , A. M. Swinbank , R. G. Bower , Chian-Chou Chen , Y. Koyama , A. P. Thomson

We present maps of the 850 micron and 450 micron continuum emission seen towards a sample of 68 high-mass protostellar candidates with luminosities ranging from 10^2.5 to 10^5 solar luminosity. Most of these candidate high-mass stars are in…

天体物理学 · 物理学 2009-11-10 S. J. Williams , G. A. Fuller , T. K. Sridharan

We report on the first observation of the nuclear region of M31 with the Chandra X-ray Observatory. The nuclear source seen with the Einstein and ROSAT HRIs is resolved into five point sources. One of these sources is within 1'' of the M31…

Francis & Hewett (1993) identified two 10-Mpc scale regions of the high redshift universe that were seemingly very overdense in neutral hydrogen. Subsequent observations showed that at least one of these gas-rich regions enveloped a cluster…

天体物理学 · 物理学 2009-10-31 Paul J. Francis , Greg M. Wilson , Bruce E. Woodgate

Young massive stars and stellar clusters continuously form in the Galactic disk, generating new HII regions within their natal giant molecular clouds and subsequently enriching the interstellar medium via their winds and supernovae. Massive…

We have carried out a high-sensitivity and high-resolution radio continuum study towards a sample of 47 massive dense cores (MDCs) in the Cygnus X star-forming complex using the Karl G. Jansky Very Large Array, aiming to detect and…

星系天体物理 · 物理学 2022-03-30 Yuwei Wang , Keping Qiu , Yue Cao , Yu Cheng , Junhao Liu , Bo Hu

We analyze a complete sample of gamma-ray burst afterglows, and find X-ray evidence for high column densities of gas around them. The column densities are in the range 1e+22-1e+23/cm2, which is right around the average column density of…

天体物理学 · 物理学 2009-10-31 Titus J. Galama , Ralph A. M. J. Wijers

Sensitive, imaging observations of the 1.1 mm dust continuum emission from a 1 deg^2 area collected with the AzTEC bolometer camera on the Large Millimeter Telescope are presented. A catalog of 1545 compact sources is constructed based on a…

星系天体物理 · 物理学 2017-11-15 M. Heyer , G. W. Wilson , R. Gutermuth , S. Lizano , A. Gomez-Ruiz , S. Kurtz , A. Luna , E. O. Serrano-Bernal , F. P. Schloerb

We have spatially and spectrally resolved the sources of X-ray emission from the X-ray faint S0 galaxy NGC 1553 using an observation from the Chandra X-ray Observatory. The majority (70%) of the emission in the 0.3 - 10.0 keV band is…

天体物理学 · 物理学 2009-10-31 E. L. Blanton , C. L. Sarazin , J. A. Irwin

We obtained 350 and 850 micron continuum maps of the infrared dark cloud G049.40-00.01. Twenty-one dense clumps were identified within G049.40-00.01 based on the 350 micron continuum map with an angular resolution of about 9.6". We present…

星系天体物理 · 物理学 2015-05-30 Miju Kang , Minho Choi , John H. Bieging , Jeonghee Rho , Jeong-Eun Lee , Chao-Wei Tsai

We present a high sensitivity radio continuum survey at 6 and 1.3$\,$cm using the Karl G. Jansky Very Large Array towards a sample of 58 high-mass star forming regions. Our sample was chosen from dust clumps within infrared dark clouds with…

Results of the deep survey of the Large Magellanic Cloud (LMC), performed with the INTEGRAL observatory, are presented. The long exposure (~7 Ms) allowed us to detect twenty one sources in this sky region: ten belonging to the LMC itself (7…

高能天体物理现象 · 物理学 2015-06-05 S. A. Grebenev , A. A. Lutovinov , S. S. Tsygankov , I. A. Mereminskiy

Scenarios that invoke multiple episodes of star formation within young globular clusters (GCs) to explain the observed chemical and photometric anomalies in GCs, require that clusters can retain the stellar ejecta of the stars within them…

星系天体物理 · 物理学 2015-06-22 Nate Bastian , Jay Strader

The Galaxy appears to be richer in young, massive stellar clusters than previously known, due to advances in infrared surveys which have uncovered deeply embedded regions of star formation. Young, massive clusters can significantly impact…

星系天体物理 · 物理学 2015-06-11 Emily E. Richards , Cornelia C. Lang , Christine Trombley , Donald F. Figer

In this contribution, we revisit the model of a dust-enshrouded star orbiting a low-luminosity galactic nucleus (Zaja\v{c}ek et al. 2014, 2016, 2017). Although it is quite challenging for dust to survive in hot X-ray-emitting plasma…

星系天体物理 · 物理学 2024-11-14 Michal Zajaček , Monika Pikhartová , Florian Peissker

We report Mopra (ATNF), Anglo-Australian Telescope, and Atacama Submillimeter Telescope Experiment observations of a molecular clump in Carina, BYF73 = G286.21+0.17, which give evidence of large-scale gravitational infall in the dense gas.…