DISCOVERY OF DRAMATIC OPTICAL VARIABILITY IN SDSS J1100+4421: A PECULIAR RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXY?
2014 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 793, no 2, L26- p.Article in journal (Refereed) Published
We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observations suggest that this object is likely a narrow-line Seyfert 1 galaxy (NLS1) at z = 0.840, however, with unusually strong narrow emission lines. The estimated black hole mass of similar to 10(7) M-circle dot implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R similar or equal to 4 x 10(2)-3 x 10(3), which implies the presence of relativistic jets. Rapid and large-amplitude optical variability of the target, reminiscent of that found in a few radio- and gamma-ray-loud NLS1s, is therefore produced most likely in a blazar-like core. The 1.4 GHz radio image of the source shows an extended structure with a linear size of about 100 kpc. If SDSS J1100+4421 is a genuine NLS1, as suggested here, this radio structure would then be the largest ever discovered in this type of active galaxies.
Place, publisher, year, edition, pages
2014. Vol. 793, no 2, L26- p.
galaxies: active, galaxies: individual (SDSS J110006.07+442144.3), galaxies: jets, galaxies: Seyfert
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-108206DOI: 10.1088/2041-8205/793/2/L26ISI: 000341885900005OAI: oai:DiVA.org:su-108206DiVA: diva2:760290