J/MNRAS/478/4238 Properties of IR-bright AGNs (Dai+, 2018)
Is there a relationship between AGN and star formation in IR-bright AGNs?
Dai Y.S., Wilkes B.J., Bergeron J., Kuraszkiewicz J., Omont A., Atanas A.,
Teplitz H.I.
<Mon. Not. R. Astron. Soc., 478, 4238-4254 (2018)>
=2018MNRAS.478.4238D 2018MNRAS.478.4238D (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, IR ; X-ray sources
Keywords: galaxies: active - galaxies: star formation - infrared: galaxies -
X-rays: galaxies
Abstract:
We report the relationship between the luminosities of active galactic
nuclei (AGNs) and the rates of star formation (SF) for a sample of 323
far-infrared (FIR)-detected AGNs. This sample has a redshift range of
0.2<z<2.5, and spans three orders of magnitude in luminosity,
LX∼1042-45erg/s. We find that in AGN hosts, the total infrared
(IR) luminosity (8-1000um) has a significant AGN contribution (average
∼20 per cent), and we suggest using the FIR luminosity (30-1000um) as
a more reliable star formation rate (SFR) estimator. We conclude that
monochromatic luminosities at 60 and 100um are also good SFR
indicators with negligible AGN contributions, being less sensitive
than integrated IR luminosities to the shape of the AGN spectral
energy distribution (SED), which is uncertain at λ>100um.
Significant bivariate LX-LIR correlations are found, which remain
significant in the combined sample when using residual partial
correlation analysis to account for the inherent redshift dependence.
No redshift or mass dependence is found for the ratio between SFR and
black hole accretion rate (BHAR), which has a mean and scatter of
log(SFR/BHAR)=3.1±0.5, agreeing with the local mass ratio between
supermassive black hole and host galaxies. The large scatter in this
ratio and the strong AGN-SF correlation found in these IR-bright AGNs
are consistent with the scenario of an AGN-SF dependence on a common
gas supply, regardless of the evolutionary model.
Description:
To focus on the AGN phase where both BH accretion and SF are active,
we selected a sample of AGNs detected in both hard X-ray (2-10keV) and
FIR (250um) with redshifts and multiwavelength photometry for SED and
luminosity estimates.
We have constructed a sample of 323 IR-bright AGNs with
LX>1042erg/s at 0.2<z< 2.5 in the ∼11deg2 XMM-LSS field (the
main sample, sample 1).
We also construct an expanded sample of 558, X-ray AGNs with
1-3σ IR detections, formally undetected (sample 2); and a
supplementary sample of 32, z<0.2 or z>2.5 IR-bright AGNs (sample 3).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 118 913 Derived properties for IR-bright AGNs
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See also:
J/MNRAS/429/1652 : XMM-LSS catalogue. Version II. (Chiappetti+, 2013)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [2XLSSd]
8- 23 A16 --- 2XLSSd Object identification same as in Chiappetti
et al. (2013MNRAS.429.1652C 2013MNRAS.429.1652C,
Cat. J/MNRAS/429/1652) (JHHMMSS.s+DDMMSS)
25- 29 F5.3 --- z Redshift
31 I1 --- f_z [1/2] Redshift flag,
1 for spec-z, 2 for photo-z
33- 38 F6.1 K Tdust Peak dust temperature
40- 44 F5.1 K e_Tdust Peak dust temperature error
46- 48 F3.1 --- alpha Power-law index
50- 53 F4.1 --- e_alpha Power-law index error
55- 59 F5.2 --- HR X-ray Hardness ratio [HR=(H-S)/(H+S)]
based on net count rates
61- 72 E12.6 [cm-2] NHint Intrinsic column density derived from
redshift and HR
73- 78 F6.3 [10-7W] logLX(2-10) Obscuration corrected rest-frame X-ray
luminosity (2-10keV)
80- 85 F6.3 [10-7W] logLIRAGN AGN contributed IR
luminosity (8-1000um) (1)
87- 92 F6.3 [10-7W] logLIRSF AGN-subtracted IR luminosity (8-1000um) (2)
93- 96 I4 Myr/yr SFRIR SFR derived from logLIRSF using the
Kennicutt (1998ARA&A..36..189K 1998ARA&A..36..189K)
relation (2)
98-103 F6.3 [Msun] logMdust Dust mass derived from FIR photometry
107-111 F5.3 [Msun] e_logMdust Dust mass derived from FIR photometry error
113-116 F4.2 [Msun] logMBH ? SMBH mass derived for the subsample
with optical broad emission lines
118 I1 --- Flag [1/3] Sample flag (3)
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Note (1): based on X-ray luminosity converted 6um luminosity (Stern,
2015ApJ...807..129S 2015ApJ...807..129S, Cat. J/ApJ/807/129) and SED template from (Dai et al.,
2012ApJ...753...33D 2012ApJ...753...33D).
Note (2): A value of '0' marks purely AGN-driven IR luminosity
Note (3): Sample flag as follows:
1 = main sample
2 = expanded sample
3 = supplementary sample
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Sep-2021