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SUMMARY:Continuous X-ray monitoring of the south ecliptic pole with eROSIT
 A
DTSTART;VALUE=DATE-TIME:20230628T110000Z
DTEND;VALUE=DATE-TIME:20230628T111500Z
DTSTAMP;VALUE=DATE-TIME:20260306T091902Z
UID:indico-contribution-814@cern.ch
DESCRIPTION:Speakers: Teng Liu (Max Planck Institute for Extraterrestrial 
 Physics)\nThe eROSITA all-sky surveys (eRASS) continuously scan the sky \n
 along great circles crossing the ecliptic poles. This scanning strategy \n
 covers the full sky every six months and visits the ecliptic poles every \
 nfour hours\, leading to much longer exposure time and much higher cadence
  \nat the ecliptic poles than the majority of the sky. Between Dec. 2019 \
 nand Feb. 2022\, the eRASS surveys scanned the full sky more than four \nt
 imes and observed the ecliptic poles more than 4600 times\, with a total \
 nexposure of more than 160ks at the ecliptic poles. Because of the long \n
 exposure near the confusion limit of eROSITA\, we treated the region \nwit
 hin 3 degrees of the south ecliptic pole (SEP) separately from the \nmain 
 part of the eRASS surveys and detected X-ray sources with a \npipeline fin
 e-tuned for such crowed fields. We built a catalog with ~15k \nX-ray sourc
 es within 3 degrees of SEP (~8k within 1 degree) and \nidentified their mu
 ltiband counterparts from a few catalogs including \nCatWISE\, NSC-DR2\, S
 -CVZ\, and GAIA-DR3. Based on multiband colors\, we \nselected AGN from th
 em and used the AAOmega spectrograph onboard the AAT \ntelescope to follow
  them up. A large number of the X-ray sources exhibit \nsignificant variab
 ility\, including a few particular targets that are \npossibly tidal disru
 ption events\, AGN shutting down or ignition events\, \nor quasi-periodic 
 oscillation cases. We study the normalized excess \nvariance and power spe
 ctral densities of AGN with X-ray light curves\, \nmeasure their optical p
 roperties\, e.g.\, black hole mass\, using optical \nspectra\, and analyze
  the correlation between them.\n\nhttps://indico.unina.it/event/61/contrib
 utions/814/
LOCATION:Centro Congressi Federico II Aula Magna
URL:https://indico.unina.it/event/61/contributions/814/
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