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1. The universal “heartbeat” oscillications in black hole systems accross the mass-scale | |||
Wu Qingwen,Bozena Czerny,Mikolaj Grzedzielski,Agnieszka Janiuk,Wei-Min Gu,Ai-jun Dong,Xiao-Feng Cao,Bei You,Zhen Yan,Mou-Yuan Sun | |||
Astronomy 09 October 2016 | |||
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Abstract:The hyperluminous X-ray source (HLX-1, the peak X-ray luminosity $sim 10^{42} m erg s^{-1}$) near the spiral galaxy ESO 243-49 is possibly the best candidate for intermediate mass black hole (IMBH), which underwent recurrent outbursts with a period of $sim 400$ days. The physical reason for this quasi-periodic variability is still unclear. We explore the possibility of radiation-pressure instability in accretion disk by modeling the light curve of HLX-1, and find that it can roughly reproduce the duration, period and amplitude of the recurrent outbursts HLX-1 with an IMBH of $sim 10^5$ Msun. Our result provides a possible mechanism to explain the recurrent outbursts in HLX-1. We further find a universal correlation between the outburst duration and the bolometric luminosity for the BH sources with a very broad mass range (e.g., X-ray binaries, XRBs, HLX-1 and active galactic nuclei, AGNs), which is roughly consistent with the prediction of radiation-pressure instability of the accretion disk. These results imply that ``heartbeat" oscillations triggered by radiation-pressure instability may appears in different-scale BH systems. | |||
TO cite this article:Wu Qingwen,Bozena Czerny,Mikolaj Grzedzielski, et al. The universal “heartbeat” oscillications in black hole systems accross the mass-scale[OL].[ 9 October 2016] http://en.paper.edu.cn/en_releasepaper/content/4706442 |
2. The relations of stellar mass and electron temperature-based metallicity of Star-forming galaxies in a wind mass range | |||
Weibin Shi | |||
Astronomy 16 December 2013 | |||
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Abstract:We select 132 star-forming galaxies from SDSS-DR5-7 with strong emission lines, including [OIII]4363 detected at a signal-to-noise larger than 5sigma. We determine their oxygen abundance, using the temperature-sensitive (T_e) method. Combining 436 star-forming galaxies from Yin et al. (2007), we fit the relation of stellar mass and metallicity in a least-squares linear fit to the median data. We compare our relation with previous results. We find the [OIII]4363 detected more massive galaxies have much lower oxygen abundances than the normal galaxies at the given stellar mass. Part could be explained by the sample themselves as low metallicity ones, but part could come from the method itself. Adopting Andrew (2013) and Lee et al. (2006) data, we derive a consistent relation of stellar mass and metallicity for star-forming galaxies in a much wider stellar mass range: from 10^6M_odot to 10^{11}M_odot. | |||
TO cite this article:Weibin Shi. The relations of stellar mass and electron temperature-based metallicity of Star-forming galaxies in a wind mass range[OL].[16 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4570674 |
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