2016A&A...586L...2G


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST08:08:53

2016A&A...586L...2G - Astronomy and Astrophysics, volume 586, L2-2 (2016/2-1)

Optical-NIR spectroscopy of the puzzling γ-ray source 3FGL 1603.9-4903/PMN J1603-4904 with X-Shooter.

GOLDONI P., PITA S., BOISSON C., MUELLER C., DAUSER T., JUNG I., KRAUSS F., LENAIN J.-P. and SOL H.

Abstract (from CDS):

The Fermi/LAT instrument has detected about two thousand extragalactic high energy (E≥100MeV) γ-ray sources. One of the brightest is 3FGL J1603.9-4903; it is associated to the radio source PMN J1603-4904. Its nature is not yet clear, it could be either a very peculiar BL Lac or a compact symmetric object radio source which are considered as the early stage of a radio galaxy. The latter, if confirmed, would be the first detection in γ-rays for this class of objects. A redshift z=0.18±0.01 has recently been claimed on the basis of the detection of a single X-ray line at 5.44±0.05keV which has been interpreted as a 6.4keV (rest frame) fluorescent line. We aim to investigate the nature of 3FGL J1603.9-4903/PMN J1603-4904 using optical-to near-IR (NIR) spectroscopy. We observed PMN J1603-4904 with the UV-NIR VLT/X-Shooter spectrograph for two hours. We extracted spectra in the visible and NIR range that we calibrated in flux and corrected for telluric absorption. We systematically searched for absorption and emission features. The source was detected starting from ∼6300Å down to 24000Å with an intensity similar to that of its 2MASS counterpart and a mostly featureless spectrum. The continuum lacks absorption features and thus is non-stellar in origin and most likely non-thermal. In addition to this spectrum, we detected three emission lines that we interpret as the Hα-[NII] complex, the [SII]λ,λ6716, 6731 doublet and the [SIII]λ 9530 line; we obtain a redshift estimate of z=0.2321±0.0004. The line ratios suggest that a LINER/Seyfert nucleus powers the emission. This new redshift measurement implies that the X-ray line previously detected should be interpreted as a 6.7keV line which is very peculiar.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: PMN J1603-4904 - gamma rays: galaxies - galaxies: distances and redshifts

Status at CDS:  

Simbad objects: 4

goto Full paper

goto View the reference in ADS

Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4046 2
2 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 374 1
3 PMN J1603-4904 QSO 16 03 50.690 -49 04 05.49   20.67       ~ 52 0
4 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1989 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2016A&A...586L...2G and select 'bookmark this link' or equivalent in the popup menu


2020.04.06-08:08:53

© Université de Strasbourg/CNRS

    • Contact