High energy gamma-ray sources in the VVV survey - II. The AGN counterparts

被引：0

作者：

Donoso, Laura G. ^{[1
,2
]}

Pichel, Ana

Baravalle, Laura D. ^{[3
,4
]}

Alonso, M. Victoria ^{[3
,4
]}

Schmidt, Eduardo O.

Minniti, Dante ^{[5
,6
,7
]}

Masetti, Nicola ^{[5
,8
]}

Smith, Leigh C. ^{[9
]}

Lucas, Philip W. ^{[10
]}

Villalon, Carolina

Rovero, Adrian C.

Coldwell, Georgina ^{[11
]}

机构：

[1] Consejo Nacl Invest Cient & Tecn, Inst Ciencias Astron Tierra & Espacio ICATE, CC 467, RA-5400 San Juan, Argentina

[2] UBA, Inst Astron & Fis Espacio IAFE, CONICET, C1428ZAA, Buenos Aires, DF, Argentina

[3] UNC, CONICET, Inst Astron Teor & Expt IATE, Laprida 854,X5000, Cordoba, Argentina

[4] Univ Nacl Cordoba, Observ Astron Cordoba, X5000BGR, Cordoba, Argentina

[5] Univ Andres Bello, Fac Ciencias Exactas, Inst Astrofis, Ave Fernandez Concha 700, Santiago 7591538, Chile

[6] Vatican Observ, V-00120 Vatican City, Vatican City St, Vatican

[7] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil

[8] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[9] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[10] Univ Hertfordshire, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England

[11] UNSJ, Fac Ciencias Exactas Fis & Nat, Dept Geofis & Astron, CONICET, J5402DCS, San Juan, Argentina

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 529卷 / 02期

关键词：

galaxies:active; infrared:galaxies; surveys; catalogues; OPTICAL SPECTROSCOPIC OBSERVATIONS; ACTIVE GALACTIC NUCLEI; VISTA VARIABLES; CATALOG; I; VARIABILITY; CANDIDATES; GALAXIES; BLAZARS; BLANCO;

D O I：

10.1093/mnras/stae124

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We identified Active Galactic Nuclei (AGN) candidates as counterparts to unidentified gamma-ray sources (UGS) from the Fermi-LAT Fourth Source Catalogue at lower Galactic latitudes. Our methodology is based on the use of near- and mid-infrared photometric data from the VISTA Variables in the V & iacute;a L & aacute;ctea (VVV) and Wide-field Infrared Survey Explorer (WISE) surveys. The AGN candidates associated with the UGS occupy very different regions from the stars and extragalactic sources in the colour space defined by the VVV and WISE infrared colours. We found 27 near-infrared AGN candidates possibly associated with 14 Fermi-LAT sources using the VVV survey. We also found 2 blazar candidates in the regions of 2 Fermi-LAT sources using WISE data. There is no match between VVV and WISE candidates. We have also examined the K-s light curves of the VVV candidates and applied the fractional variability amplitude (sigma(rms)) and the slope of variation in the K-s passband to characterise the near-infrared variability. This analysis shows that more than 85 per cent of the candidates have slopes in the K-s passband >10(-4) mag/day and present sigma(rms) values consistent with a moderate variability. This is in good agreement with typical results seen from type-1 AGN. The combination of YJHK(s) colours and K-s variability criteria was useful for AGN selection, including its use in identifying counterparts to Fermi gamma-ray sources.

引用

页码：1019 / 1034

页数：16

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