Query : 2009A&A...502..787Z

2009A&A...502..787Z - Astronomy and Astrophysics, volume 502, 787-790 (2009/8-2)

Infrared identification of IGR J09026-4812 as a Seyfert 1 galaxy.


Abstract (from CDS):

IGR J09026-4812 was discovered by INTEGRAL in 2006 as a new hard X-ray source. Thereafter, an observation with Chandra pinpointed a single X-ray source within the ISGRI error circle, showing a hard spectrum, and improving its high-energy localisation to a subarcsecond accuracy. Thus, the X-ray source was associated with the infrared counterpart 2MASS J09023731-4813339 whose JHKS photometry indicated a highly reddened source. The high-energy properties and the counterpart photometry suggested a high-mass X-ray binary with a main sequence companion star located 6.3-8.1kpc away and with a 0.3-10keV luminosity of 8–1+13x1034erg/s. New optical and infrared observations were needed to confirm the counterpart and to reveal the nature of IGR J09026-4812. We performed optical and near infrared observations on the counterpart 2MASS J09023731-4813339 with the ESO/NTT telescope on March 2007. We carried out photometry and spectroscopy in near infrared wavelengths and photometry in optical wavelengths. The accurate astrometry at both optical and near infrared wavelengths confirmed 2MASS J09023731-4813339 as the counterpart of IGR J09026-4812. However, the near infrared images show that the source is extended, thus excluding the possibility of a Galactic compact source. The source spectrum shows three main emission lines identified as the HeI λ1.0830µm line, and the HI Paβ and Paα lines, typical of galaxies with an active galactic nucleus. The broadness of these lines reached values as large as 4000km/s, suggesting a type 1 Seyfert galaxy. The redshift of the source is z=0.0391±0.0004. Thus, the near infrared photometry and spectroscopy allowed us to classify IGR J09026-4812 as a type 1 Seyfert galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: Seyfert - infrared: galaxies - X-rays: individual: IGR J09026-4812

CDS comments: Paragraph 2.1 HIP 0842847 is a probable misprint for HIP 42874.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 2MASS J06423635-4509068 * 06 42 36.3527300376 -45 09 06.731822313   13.452 12.867     ~ 5 0
2 HD 62388 * 07 43 14.9961376440 -12 24 02.106201600   8.93 8.90     A0V 13 0
3 HD 74733 PM* 08 43 52.5940614600 -46 29 57.687805068   9.47 8.85     G2V 16 0
4 2MASS J09023731-4813339 Sy1 09 02 37.32 -48 13 33.9           ~ 35 0
5 GSPC S262-E * 09 45 42.8 -45 49 40           ~ 4 0

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