Lijiang 2.4-meter Telescope and its instruments

Wang, Chuanjun; Bai, J. M.; Fan, Yufeng; Mao, Jirong; Chang, Liang; Xin, Yuxin; Zhang, Jujia; Lun, Bao-Li; Wang, Jianguo; Zhang, Xiliang; Mei, Ying; Wang, Xiaoli; Ji, Kaifan; Xiong, Dingrong; Ding, Xu; Yang, Kai; Yi, Weimin; Xu, Liang; Zheng, Xu-Chang; Feng, Yongming; He, Shou-Sheng; Wang, Xueli; Liu, Zhong; Chen, Dong; Xu, Jie; Qin, Shijun; Zhang, Rui-Long; Tan, Huisong; Li, Zhi; Liang, Ke; Li, Jian; Liu, Weiwei

doi:10.1088/1674-4527/19/10/149

Cited by 66 publications

(31 citation statements)

References 26 publications

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“…The spectroscopic observation of Mrk 817 and NGC 7469 were taken using Yunnan Faint Object Spectrograph and Camera (YFOSC) mounted on the Lijiang 2.4-meter telescope (LJT), which locates in Lijiang and is administered by Yunnan Observatories, Chinese Academy of Sciences. The detailed information of the observation site including the telescope, instruments, observing conditions and some calibration methods are described in Fan et al (2015), Wang et al (2019), Xin et al (2020) and Lu et al (2021).…”

Section: Spectroscopic Observationmentioning

confidence: 99%

Reverberation Mapping Measurements of Black Hole Masses and Broad-Line Region Kinematics in Mrk 817 and NGC 7469

Lu,

Wang,

Zhang

et al. 2021

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We present the results from a spectroscopic monitoring campaign to obtain reverberation-mapping measurements and investigate the broad-line region kinematics for active galactic nuclei (AGN) of Mrk 817 and NGC 7469. This campaign was undertaken with the Lijiang 2.4-meter telescope, the median spectroscopic sampling is 2.0 days for Mrk 817 and 1.0 days for NGC 7469. We detect time lags of the broad emission lines including Hβ, Hγ, He II and He I for both AGNs, and including Fe II for Mrk 817 with respect to the varying AGN continuum at 5100 Å. Investigating the relationship between line widths and time lags of the broad emission lines, we find that the BLR dynamics of Mrk 817 and NGC 7469 are consistent with the virial prediction. We estimate the masses of central supermassive black hole (SMBH) and the accretion rates of both AGNs. Using the data of this campaign, we construct the velocity-resolved lag profiles of the broad Hγ, Hβ, and He I lines for Mrk 817, which show almost the same kinematic signatures that the time lags in the red wing are slightly larger than the time lags in the blue wing. For NGC 7469, we only clearly construct the velocityresolved lag profiles of the broad Hγ and Hβ, which show very similar kinematic signatures to the BLR of Mrk 817. These signatures indicate that the BLR of Keplerian motion in both AGNs seemingly has outflowing components during the monitoring period. We discuss the kinematics of the BLR and the measurements including SMBH mass and accretion rates.

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Section: Spectroscopic Observationmentioning

confidence: 99%

Reverberation Mapping Measurements of Black Hole Masses and Broad-Line Region Kinematics in Mrk 817 and NGC 7469

Lu,

Wang,

Zhang

et al. 2021

Preprint

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“…In order to observe the potential optical emission, on 3 January 2022 (∼6.8 days after trigger), we observed the field of GRB 211227A with the Lijiang 2.4m telescope, which is located at Lijiang Observatory of Yunnan Observatoris, Chinese Academy of Science (Wang et al 2019;Xin et al 2020). The photometric observations were performed using Johnson R-band filter with a total exposure of 1200 s at airmass of 1.2 and a seeing of ∼1.7 under good weather conditions.…”

Section: Lijiang 24m Optical Observationsmentioning

confidence: 99%

GRB 211227A as a peculiar long gamma-ray burst from compact star merger

Lü,

Yuan,

et al. 2022

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Long-duration gamma-ray bursts (GRBs) that associated with supernova (SN) are believed to originate from massive star core-collapse events, whereas short-duration GRBs that are related to compact star mergers are expected to be accompanied by kilonova. GRB 211227A, lasting about 84 s, has a initial short/hard spike followed by a series of soft gamma-ray extended emission at redshift z =0.228. Moreover, lack of supernova associated, is down to very stringent limits at such low redshift, and is with a large physical offset (20.47 ± 14.47 kpc) from the galaxy center. Those behaviors are similar to that of GRB 060614, and suggest that the progenitor of GRB 211227A is not favored with the death of massive stars. Hence, we propose that GRB 211227A has the same physical origin with that of GRB 060614 which is from compact star mergers. One calculate pseudo-kilonova emission of this case by adopting the typical parameters with that of GRB 060614 and GRB 170817A, and we find that this pseudo-kilonova

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“…After the discovery, extensive optical and NIR follow-up observations were conducted for SN 2012ij on several facilities. A total of 14 spectra were obtained for SN 2012ij, including 4 optical spectra from the Xinglong 2.16-m Telescope (XLT; Fan et al 2016), 3 optical spectra from Lijiang 2.4-m Telescope(LJT; Fan et al 2015;Wang et al 2019), 4 optical spectra from LCO du Pont and Nordic Optical Telescope (NOT), and 3 NIR spectra from Folded-port Infrared Echellette (FIRE) mounted on the Magellan Baade Telescope (CSP-II). A journal of spectroscopic observations is listed in Table 2.…”

Section: Spectroscopymentioning

confidence: 99%

SN 2012ij: A low-luminosity type Ia supernova and evidence for continuous distribution from 91bg-like explosion to normal ones

Li,

Zhang,

Wang

et al. 2022

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In this paper, we present photometric and spectroscopic observations of a subluminous type Ia supernova (SN Ia) 2012ij, which has an absolute B-band peak magnitude M B,max = −17.95 ± 0.15 mag. The B-band light curve exhibits a fast post-peak decline with ∆m 15 (B) = 1.86 ± 0.05 mag. All the R and I/i-band light curves show a weak secondary peak/shoulder feature at about 3 weeks after the peak, like some transitional subclass of SNe Ia, which could result from an incomplete merger of near-infrared (NIR) double peaks. The spectra are characterized by Ti ii and strong Si ii λ5972 absorption features that are usually seen in low-luminosity objects like SN 1999by. The NIR spectrum before maximum light reveals weak carbon absorption features, implying the existence of unburned materials. We compare the observed properties of SN 2012ij with those predicted by the sub-Chandrasekhar-mass and the Chandrasekhar-mass delayed-detonation models, and find that both optical and NIR spectral properties can be explained to some extent by these two models. By comparing the secondary maximum features in I and i bands, we suggest that SN 2012ij is a transitional object linking normal SNe Ia to typical 91bg-like ones. From the published sample of SNe Ia from the Carnegie S upernova Pro ject II (CSP-II), we estimate that the fraction of SN 2012ij-like SNe Ia is not lower than ∼ 2%.

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Lijiang 2.4-meter Telescope and its instruments

Cited by 66 publications

References 26 publications

Reverberation Mapping Measurements of Black Hole Masses and Broad-Line Region Kinematics in Mrk 817 and NGC 7469

Reverberation Mapping Measurements of Black Hole Masses and Broad-Line Region Kinematics in Mrk 817 and NGC 7469

GRB 211227A as a peculiar long gamma-ray burst from compact star merger

SN 2012ij: A low-luminosity type Ia supernova and evidence for continuous distribution from 91bg-like explosion to normal ones

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