Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Chen, Sina"'
Autor:
Chen, Sina, Kharb, Preeti, Sasikumar, Silpa, Nandi, Sumana, Berton, Marco, Jarvela, Emilia, Laor, Ari, Behar, Ehud, Foschini, Luigi, Vietri, Amelia, Gu, Minfeng, La Mura, Giovanni, Crepaldi, Luca, Zhou, Minhua
We present new 1.5-8.5 GHz Very Long Baseline Array (VLBA) observations and 0.32-1.26 GHz Giant Meterwave Radio Telescope (GMRT) observations of J0354-1340, which is the only known radio-quiet (RQ) or radio-intermediate (RI) narrow-line Seyfert 1 gal
Externí odkaz:
http://arxiv.org/abs/2312.13351
The origin of the radio emission in radio-quiet quasars (RQQ) is not established yet. We present new VLBA observations at 1.6 and 4.9 GHz of ten RQQ (nine detected), which together with published earlier observations of eight RQQ (five detected), for
Externí odkaz:
http://arxiv.org/abs/2307.13599
Autor:
Wang, Ailing, An, Tao, Guo, Shaoguang, Ho, Luis C., Baan, Willem A., Braun, Robert, Chen, Sina, Cheng, Xiaopeng, Hartley, Philippa, Yang, Jun, Zhang, Yingkang
Measuring the proper motion of the emission component in radio-quiet quasars (RQQs) could help to distinguish between the origins of the radio emission and to understand whether the jet production mechanism is the same in radio-loud quasars (RLQs) an
Externí odkaz:
http://arxiv.org/abs/2305.03470
Publikováno v:
A&A 676, A9 (2023)
We report on an identification of a new gamma-ray emitting narrow-line Seyfert 1 galaxy (gamma-NLS1), SDSS J095909.51+460014.3 (z = 0.399), by establishing an association with a gamma-ray source 4FGL 0959.6+4606, although its low-energy counterpart w
Externí odkaz:
http://arxiv.org/abs/2212.04036
Quasi-simultaneous observations of radio and X-ray variability in three radio-quiet Seyfert galaxies
Radio variability in some radio-quiet (RQ) active galactic nuclei suggests emission from regions close to the central engine, possibly the outer accretion disc corona. If the origins of the radio and the X-ray emission are physically related, their e
Externí odkaz:
http://arxiv.org/abs/2207.01601
Autor:
Chen, Sina, Stevens, Jamie B., Edwards, Philip G., Laor, Ari, Gu, Minfeng, Berton, Marco, Järvelä, Emilia, Kharb, Preeti, Behar, Ehud, Su, Renzhi
We present radio spectral analyses for a sample of 29 radio-quiet (RQ) and three radio-loud (RL) narrow-line Seyfert 1 galaxies (NLS1s) detected with the Australia Telescope Compact Array at both 5.5 GHz and 9.0 GHz. The sample is characterized by L_
Externí odkaz:
http://arxiv.org/abs/2202.11065
Autor:
Punsly, Brian, Chen, Sina
A high sensitivity, 7mm Very Long Baseline Array image of M\,87 was previously analyzed in order to estimate the bulk flow jet velocity between 0.4 and 0.65 mas from the point of origin using the asymmetry between the well-characterized double-ridged
Externí odkaz:
http://arxiv.org/abs/2111.00692
Autor:
Punsly, Brian, Frey, Sandor, Reynolds, Cormac, Marziani, Paola, Pushkarev, Alexander, Chen, Sina, Li, Shang, Kharb, Preeti
PKS\,1351$-$018 at a redshift of $z=3.71$ is one of the most luminous, steady synchrotron sources with a luminosity $> 10^{47}$\,erg~s$^{-1}$. The synchrotron luminosity does not seem to vary by more than $\sim 25\%$ over 35 years. In order to apprec
Externí odkaz:
http://arxiv.org/abs/2107.00716
Autor:
Zhou, Shunheng, Huang, Yu’e, Xing, Jiani, Zhou, Xu, Chen, Sina, Chen, Jiahao, Wang, Lihong, Jiang, Wei
Publikováno v:
In Genomics, Proteomics & Bioinformatics April 2023 21(2):278-282
Akademický článek
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