J/A+A/686/A223 X-ray-selected galaxies from SDSS (Pulatova+, 2024)
What excites the optical emission in X-ray-selected galaxies?
Pulatova N.G., Rix H.-W., Tugay A.V., Zadorozhna L.V., Seeburger R.,
Demianenko M.
<Astron. Astrophys. 686, A223 (2024)>
=2024A&A...686A.223P 2024A&A...686A.223P (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Galaxies ; QSOs ; Optical ; Spectroscopy
Keywords: quasars: emission lines - galaxies: Seyfert -
galaxies: star formation - X-rays: galaxies
Abstract:
We present a study of 1347 galaxies at z<0.35 with detected nuclear
X-ray emission and optical emission line diagnostics in the
Baldwin-Phillips-Terlevich (BPT) diagram. This sample was obtained by
cross-matching the X-ray Multi-Mirror Mission Observatory - Newton
(XMM-Newton) DR10 catalogue with Sloan Digital Sky Survey (SDSS) DR17
galaxies with well-measured line ratios. The distribution of these
sources in the BPT diagram covers all three excitation regimes:
Ionized Hydrogen (HII) regions (23%), 'composites' (30%), and Seyfert
galaxies with the low ionization nuclear emission line regions
(LINERs) (47%). In contrast, the fraction of objects classified as
active galactic nuclei (AGN) in the SDSS subsample selected for
cross-match with XMM-Newton is only 13%. This fact illustrates that
X-ray emission from galaxies commonly points towards the presence of
AGN. Our data show, for the first time, a clear dependence of the BPT
position on the ratio of the X-ray to Hα fluxes. Sources
dominated by X-ray emission lie in the Seyfert and LINER regimes of
the BPT diagram. Most sources with a low X-ray-to-Hα-luminosity
ratio, log10(LX/LHα)<1.0, lie in the HII regime. In our sample,
there are even 45 galaxies that have LStarXR/LTotalXray>0.5.
In contrast, the positions of the sample members in the BPT diagram
exhibit no dependence on the X-ray hardness ratio. Our finding
suggests that the X-ray-to-Hα ratio can help us to differentiate
galaxies whose X-ray flux is dominated by an AGN from galaxies with
central X-ray binaries and other stellar X-ray sources.
Description:
The X-ray-selected galaxies catalogue, derived from the cross-matching
of the X-ray Multi-Mirror Mission Observatory - Newton (XMM-Newton)
DR10 (2020A&A...641A.136W 2020A&A...641A.136W, Cat. IX/63) catalogue with Sloan Digital
Sky Survey (SDSS) DR17 (2017AJ....154...28B 2017AJ....154...28B) galaxies, provides a
comprehensive study of 1347 galaxies at z<0.35.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 401 1347 X-ray-selected galaxies from SDSS
--------------------------------------------------------------------------------
See also:
IX/63 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR10 (Webb+, 2022)
https://www.sdss4.org/dr17/ : SDSS DR17 Home Page
http://xmmssc.irap.omp.eu/Catalogue/4XMM-DR10/4XMM_DR10.html :
4XMM-DR10 Home Page
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 31 A31 --- Name Object's name (main_id) (1)
33- 43 F11.7 deg RAdeg Right ascension, J2000 (ra) (1)
45- 56 F12.8 deg DEdeg Declination, J2000 (dec) (1)
58- 69 E12.6 --- z Redshift (z) (1)
71- 82 E12.6 10-30W/m2 FHbeta Flux in Hbeta line (hbetaflux) (1)
84- 95 E12.6 10-30W/m2 e_FHbeta Error in the Hbeta flux
(hbetaflux_err) (1)
97-108 E12.6 10-30W/m2 FHalpha Flux in Halpha line
(halphaflux) (1)
110-121 E12.6 10-30W/m2 e_FHalpha Error in the Halpha flux
(halphaflux_err) (1)
123-134 E12.6 10-30W/m2 FOIII5007 Flux in OIII 5007 line
(oiii5007flux) (1)
136-147 E12.6 10-30W/m2 e_FOIII5007 Error in the OIII 5007 flux
(oiii5007flux_err) (1)
149-160 E12.6 10-30W/m2 FOI6300 Flux in OI 6300 line (oi6300flux) (1)
162-173 E12.6 10-30W/m2 e_FOI6300 Error in the OI 6300 flux
(oi6300flux_err) (1)
175-186 E12.6 10-30W/m2 FNII6548 Flux in NII 6584 line (nii6548flux) (1)
188-199 E12.6 10-30W/m2 e_FNII6548 Error in the NII 6548 flux
(nii6548flux_err) (1)
201-212 E12.6 10-30W/m2 FNII6584 Flux in NII 6584 line (nii6584flux) (1)
214-225 E12.6 10-30W/m2 e_FNII6584 Error in the NII 6584 flux
(nii6584flux_err) (1)
227-238 E12.6 10-30W/m2 FSII6717 Flux in SII 6717 line (sii6717flux) (1)
240-251 E12.6 10-30W/m2 e_FSII6717 Error in the SII 6717 flux
(sii6717flux_err) (1)
253-264 E12.6 10-30W/m2 FSII6731 Flux in SII 6731 line (sii6731flux) (1)
266-277 E12.6 10-30W/m2 e_FSII6731 Error in the SII 6731 flux
(sii6731flux_err) (1)
279-290 E12.6 mW/m2 FSCEP8 The mean total band flux (0.2-12keV)
(in erg/s/cm2 unit) (SCEP8_FLUX) (2)
292-303 E12.6 mW/m2 e_FSCEP8 Error on the weighted mean total band flux
(in erg/s/cm2 unit)
(SCEP8FLUXERR) (2)
305-313 F9.6 --- SCHR1 ?=- The mean hardness ratio of the
bands 1 and 2 (SC_HR1) (2)
315-323 F9.6 --- e_SCHR1 ?=- Error on the weighted mean hardness
ratio SCHR1 (SCHR1ERR) (2)
325-333 F9.6 --- SCHR2 The mean hardness ratio of the
bands 2 and 3 (SC_HR2) (2)
335-342 F8.6 --- e_SCHR2 Error on the weighted mean hardness ratio
SCHR2 (SCHR2ERR) (2)
344-352 F9.6 --- SCHR3 The mean hardness ratio of the
bands 3 and 4 (SC_HR3) (2)
354-362 F9.6 --- e_SCHR3 Error on the weighted mean hardness ratio
SCHR3 (SCHR3ERR) (2)
364-372 F9.6 --- SCHR4 ?=- The mean hardness ratio of the
bands 4 and 5 (SC_HR4) (2)
374-382 F9.6 --- e_SCHR4 ?=- Error on the weighted mean hardness
ratio SCHR4 (SCHR4ERR) (2)
384-401 F18.15 arcsec Sep Distance between matched objects along a
great circle (Separation) (2)
--------------------------------------------------------------------------------
Note (1): data from SDSS DR17 catalogue, fluxes are in 10-17erg/s/cm2 unit.
Note (2): data from XMM-Newton DR10 catalogue, Cat. IX/63.
--------------------------------------------------------------------------------
Acknowledgements:
Nadiia Pulatova, pulatova(at)mpia.de
(End) Patricia Vannier [CDS] 16-Apr-2024