# 2007A&A...468...97G

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 Query : 2007A&A...468...97G

2007A&A...468...97G - Astronomy and Astrophysics, volume 468, 97-101 (2007/6-2)

ROXA J081009.9+384757.0: a 1047 erg/s blazar with hard X-ray synchrotron peak or a new type of radio loud AGN?

GIOMMI P., MASSARO E., PADOVANI P., PERRI M., CAVAZZUTI E., TURRIZIANI S., TOSTI G., COLAFRANCESCO S., TAGLIAFERRI G., CHINCARINI G., BURROWS D.N., McMATH CHESTER M. and GEHRELS N.

Abstract (from CDS):

We report the discovery of ROXA J081009.9+384757.0 = SDSS J081009.9+384757.0, a z=3.95 blazar with a highly unusual Spectral Energy Distribution. This object was first noticed as a probable high fx/fr, high-luminosity blazar within the error region of a≃10–12erg/cm2/s ROSAT source which, however, also included a much brighter late-type star. We describe the results of a recent Swift observation that establishes beyond doubt that the correct counterpart of the X-ray source is the flat spectrum radio quasar. With a luminosity well in excess of 1047erg/s ROXA J081009.9+384757.0 is therefore one of the most luminous blazars known. We consider various possibilities for the nature of the electromagnetic emission from this source. In particular, we show that the SED is consistent with that of a blazar with synchrotron power peaking in the hard X-ray band. If this is indeed the case, the combination of high-luminosity and synchrotron peak in the hard-X-ray band contradicts the claimed anti-correlation between luminosity and position of the synchrotron peak usually referred to as the blazar sequence''. An alternative possibility is that the X-rays are not due to synchrotron emission, in this case the very peculiar SED of ROXA J081009.9+384757.0 would make it the first example of a new class of radio loud AGN.

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - galaxies: individual: ROXA J081009.9+384757.0 - X-rays: galaxies

Full paper

 Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [VV2006] J081009.9+384756 QSO 08 10 09.9573700608 +38 47 57.082826868   21.24 20.38 19.8   ~ 47 0
2 2A 1058-226 BLL 11 03 37.6150845072 -23 29 31.203773520   17.00 16.55 16.61   ~ 341 2
3 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2512 1
4 QSO B1426+428 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 478 2
5 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2016 2
6 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2661 2

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2022.05.21-12:23:42