2021-W41

# 2110.02982
- https://arxiv.org/abs/2110.02982
- **Investigating the Accretion Nature of Binary Supermassive Black Hole Candidate SDSS J025214.67-002813.7**
- The multiwavelength SED of binary SMBHs may exhibit a dip in optical-UV bands or lack of high-energy emission. We modelled multiwavelength SED of a SMBH binary candidate. The XMM-Newton X-ray spectrum is consistent with a single AGN with some soft excess due to extended hot gas. The radio-optical emission also cannot exclude the radio-quiet, single AGN scenario. X-ray observation in high-energy band is needed. 
- by **方正**，在这篇文章里做了一点微小的工作

# 2109.10321
- https://arxiv.org/abs/2109.10321
- **Detectability of Population III stellar remnants as X-ray binaries from tidal captures in the local Universe**
- This work explore the detectability of Pop III remants in nearby dense star clusters. The signals of Pop III remants in TDEs are proved to be very unlikely to be detected due to the short lifetimes(~10^3 yr).
Thus the main approach is limited to the formation of luminous XRBs. The number of POP III XRBs is constrained to be ~0.06-0.3 in milky way NSC, 1.5-6.5 in MW and 40-2800 in Virgo cluster. While given the distance of Virgo cluster, the low-mass Pop III XRBs will have flux ~3x10^18 ergs-1cm-2, lower than the sensitivity of present X-ray telescopes.
- by **鲍通**

# 2110.04315
- https://arxiv.org/abs/2110.04315
- **Expanding Bipolar X-ray Structure After the 2006 Eruption of RS Oph**
- RS Oph is a recurrent novae which erupted several times in history. The authors report the detection of a bipolar expanding X-ray flow at a speed of ~4600 km/s. This spectral analysis suggested that the ejecta of 2006-eruption was collimated away from equitorial plane and freely expand into the cavity left by the 1985-eruption.
- by **方正**

# 2110.05514
- https://arxiv.org/abs/2110.05514
- **Radio and X-ray observations of the luminous Fast Blue Optical Transient AT2020xnd**
- Fast Blue Optical Transient (FBOT) is a new class of transient characterized by rapid rise to peak luminosity (<10d), high peak optical luminosity (>10^43 erg/s), and persistent blue colors. This work presents deep X-ray and radio observations of AT2020xnd, the third FBOT detected in X-ray. From radio SED fit, the authors find that AT2020xnd launched a high-velocity outflow (v~0.1-0.2c) propagating into a dense circumstellar medium. The X-ray emission is in excess compared to extrapolated synchrotron spectrum, which indicates a different emission component. The decay rate of X-ray emission significantly increases at ~20d after the discovery, while the cause is unclear.
- by **苏钊**

# 2110.06224
- https://arxiv.org/abs/2110.06224
- **A detailed study of the bridge of excess X-ray emission between the galaxy clusters Abell 2029 and Abell 2033**
- A mystical morphology is found in the Abell 2029/ Abell 2033 system that a bridge of X-ray emission joins the two clusters. Using the Suzaku, Newton and Chandra observations, the authors rule out the possiblities that the excess is from overlapping or components from other sources. This filament with ~ 1.0 Mpc wide has a mauch colder temperature (~ 1.5 keV) than the two clusters (~ 5 keV) and it is similar to Abell 222/223 filaments in geometry, density and temperature so that it can originate from WHIM.
- by **华子乾**

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