OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3

Morokuma, T, Tanaka, M, Tanaka, YT, Itoh, R, Tominaga, N, Gandhi, P, Pian, E, Mazzali, PA, Ohta, K, Matsumoto, E, Shibata, T, Akimoto, H, Akitaya, H, Ali, GB, Aoki, T, Doi, M, Ebisuda, N, Essam, A, Fujisawa, K, Fukushima, H et al (2017) OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3. Publications of the Astronomical Society of Japan, 69 (5). ISSN 0004-6264

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Abstract

We present monitoring campaign observations at optical and near-infrared (NIR) wavelengths for a radio-loud active galactic nucleus (AGN) at z = 0.840, SDSS J110006.07+442144.3 (hereafter, J1100+4421), which was identified during a flare phase in late 2014 February. The campaigns consist of three intensive observing runs from the discovery to 2015 March, mostly within the scheme of the OISTER collaboration. Optical-NIR light curves and simultaneous spectral energy distributions (SEDs) are obtained. Our measurements show the strongest brightening in 2015 March. We found that the optical-NIR SEDs of J1100+4421 show an almost steady shape despite the large and rapid intranight variability. This constant SED shape is confirmed to extend to ∼5 μm in the observed frame using the archival WISE data. Given the lack of absorption lines and the steep power-law spectrum of α ν ∼ -1.4, where fνναν, synchrotron radiation by a relativistic jet with no or small contributions from the host galaxy and the accretion disk seems most plausible as an optical-NIR emission mechanism. The steep optical-NIR spectral shape and the large amplitude of variability are consistent with this object being a low ν peak jet-dominated AGN. In addition, sub-arcsecond resolution optical imaging data taken with Subaru Hyper Suprime-Cam does not show a clear extended component and the spatial scales are significantly smaller than the large extensions detected at radio wavelengths. The optical spectrum of a possible faint companion galaxy does not show any emission lines at the same redshift, and hence a merging hypothesis for this AGN-related activity is not supported by our observations. © The Author 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.

Item Type:	Article
Additional Information:	This is a pre-copyedited, author-produced version of an article accepted for publication in Publications of the Astronomical Society of Japan following peer review. The version of record Morokuma, T., Tanaka, M., & Tanaka, Y.T. et al. OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3, Publications of the Astronomical Society of Japan, Volume 69, Issue 5, 1 October 2017, 82, is available online at: http://dx.doi.org/10.1093/pasj/psx075
Uncontrolled Keywords:	0201 Astronomical And Space Sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press (OUP)
Date of acceptance:	13 July 2017
Date of first compliant Open Access:	1 September 2019
Date Deposited:	06 Aug 2018 08:34
Last Modified:	04 Sep 2021 10:15
DOI or ID number:	10.1093/pasj/psx075
URI:	https://ljmu-9.eprints-hosting.org/id/eprint/9064

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