J/PAZh/49/369 Transient events in near-nuclear region of AGNs (Khamitov+, 2023)
Transient events in the circumnuclear regions of AGNs and quasars as sources
of imitations of proper motion.
Khamitov I.M., Bikmaev I.F., Gilfanov M.R., Sunyaev R.A., Medvedev P.S.,
Gorbachev M.A.
<Pis'ma Astron. Zh. 49, 369-398 (2023)>
=2023PAZh...49..369K 2023PAZh...49..369K (SIMBAD/NED BibCode)
=2023AstL...49..271K 2023AstL...49..271K
ADC_Keywords: X-ray sources ; Active gal. nuclei ; Proper motions
Keywords: X-ray sources - active galaxy nuclei - proper motions - catalog -
transient events
Abstract:
We present a sample of SRG/eROSITA X-ray sources located in the
eastern Galactic hemisphere (0<l<180deg), with significant proper
motions according to GAIA eDR3 measurements and whose extragalactic
nature has been confirmed. The catalog consists of 248 extragalactic
sources with spectroscopically measured redshifts. It includes all
objects available in the Simbad database and matched to the identified
optical component within a radius of 0.5-arcsec. Additionally, the
catalog includes 18 sources with the spectral redshift measurements
based on observations at the Russian-Turkish 1.5-m telescope RTT-150,
Khamitov et al. (2022AstL...48..724K 2022AstL...48..724K). The sources of the catalog are
AGNs of various types (Sy1, Sy2, LINER), quasars, radio galaxies, and
star-forming galaxies. The imitation of significant proper motions can
be explained (previously known in astrometry as the VIM effect) by the
presence of transient events on the line of sight in the field of view
of AGN nuclei and quasars (within the GAIA resolution element). Such
astrophysical phenomena may be the supernovae outbursts, tidal
destruction events in AGNs with double nuclei, variability of
large-mass supergiants, the presence of O-B associations in field of
view of variable brightness AGN, etc. A model of flares with a fast
rise and exponential decay profile allows to describe the variable
positional parameters of most similar sources observed in GAIA. This
cross-matching approach of the X-ray source catalogs of the
SRG/eROSITA observatory and the optical catalog of the GAIA
observatory can be used as an independent technique for detecting
transient events in the neighborhood of AGN core (on scales of several
hundred parsecs in the picture plane).
Description:
The catalog is presented as one common identification table (tbl_id)
and 9 Tables with X-ray characteristics, classified by common object
types.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ident.dat 158 248 Identification table
agn.dat 115 25 AGNs of undetermined type (AGN, Sy, AGN cand.)
bll.dat 115 2 Blazars (BLL)
liner.dat 115 11 LINER type AGNs (LINER)
qso.dat 115 11 Quasars (QSO)
rg.dat 115 4 Radio galaxies (Galaxy R)
galaxy.dat 115 42 Undetermined type galaxies (Galaxy)
sfgal.dat 115 15 Star forming galaxies (SF) (Galaxy SF)
sy1.dat 115 106 Seyfert type 1 galaxies (Sy1)
sy2.dat 115 32 Seyfert type 2 galaxies (Sy2)
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Byte-by-byte Description of file: ident.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- SRGe+ SRGe+ identifier (JHHMMSS.s+DDMMSS)
18- 36 I19 --- GaiaEDR3 Gaia EDR3 source_id
38- 47 F10.6 deg RAdeg Right Ascension J2000
49- 58 F10.6 deg DEdeg Declination J2000
60- 69 F10.6 mas/yr mu [0.31/17.63] Proper motion module
71- 80 F10.6 mas/yr e_mu [0.06/2.3] Proper motion measurement error
82- 91 F10.6 --- z [0.0/0.33] Redshift
93-101 A9 --- Type Source type
103-127 A25 --- SName Identification in the Simbad database
129-147 A19 --- Ref Reference code for the article from which
the redshift information was received
149-158 A10 --- Table Name of the table with X-ray characteristics
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Byte-by-byte Description of file: [abglqrs]*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- SRGe+ SRGe+ identified (JHHMMSS.s+DDMMSS)
18- 27 F10.6 deg RAdeg Right Ascension J2000
29- 38 F10.6 deg DEdeg Declination J2000
40- 49 F10.6 mag Gmag magnitude in the G band (Gaia eDR3)
51- 60 F10.6 mas/yr mu Proper motion module
62- 71 F10.6 --- tau Logarithm of the ratio of the X-ray flux FX
from eROSITA data in the range 0.3-2.3keV
to the optical flux Fopt in the G band
from Gaia eDR3 data
73- 82 F10.6 --- Xvar X-ray variability (1)
84- 93 F10.6 10+35W LX X-ray luminosity from eROSITA data
(in 1042erg/s) (2)
95-104 F10.6 --- z Redshift
106-115 F10.6 10+35W LT Lower estimation of the largest optical
luminosity of the transient event falling
within the GAIA catalog interval
(in 1042erg/s)
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Note (1): X-ray variability, defined as the ratio between the maximum and
minimum flux values in the 4 eROSITA surveys without taking into account
the flux measurement error.
Note (2): X-ray luminosity from eROSITA data in the range 0.3-2.3keV in its own
reference frame without correction for internal absorption and absorption
in the Galaxy (in 1042erg/s).
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Acknowledgements:
Pavel Medvedev, tomedvedev(at)iki.rssi.ru
References:
Khamitov et al., 2022AstL...48..724K 2022AstL...48..724K, Detection of AGNs and quasars having
significant proper motions according to Gaia data within
SRG/eRosita X-Ray sources catalog
(End) Patricia Vannier [CDS] 08-Sep-2023