SDSS J125417.98+274004.6: An X-ray Detected Minor Merger Dual AGN

Abstract

In this paper, we present the discovery of a dual AGN in a $\sim$11:1 minor merger between the galaxy SDSS J125417.98+274004.6 and its unnamed dwarf satellite. We calculated stellar masses of the primary and secondary galaxy to be 2.5$\times$10${}^{10}$M${}_{\odot }$ and 2.2$\times$10${}^9$M${}_{\odot }$, respectively. We used archival Chandra X-ray observations to assess the presence of AGN. We found that both AGN have comparable luminosities of $\sim$2$\times$10${}^{42}$ erg s${}^{-1}$, with the secondary AGN being more likely to be the dominant one. The galaxies are in the early stages of the merger and are connected by a tidal bridge. Previous works suggest that the secondary AGN should experience a brief but intensive period of Eddington-limit approaching accretion during the early stages of the merger. During the merger, the secondary black hole can increase its mass by a factor of ten. SDSS J125417.98+274004.6 is the first known dual AGN in an early-stage minor merger with a comparably or more luminous secondary AGN. As such, it will be of great value for future studies of merger-triggered accretion and black hole growth mechanisms.

6 pages, 3 figures, 2 tables. Accepted for publication in the Open Journal of Astrophysics

References in corpus (13)

• Cold streams in early massive hot haloes as the main mode of galaxy formation
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• The Redshift Evolution of Wet, Dry, and Mixed Galaxy Mergers from Close Galaxy Pairs in the DEEP2 Galaxy Redshift Survey
• Growth and activity of black holes in galaxy mergers with varying mass ratios
• Chandra Multiwavelength Project X-ray Point Source Catalog
• Growing Massive Black Hole Pairs in Minor Mergers of Disk Galaxies
• A likely decade-long sustained tidal disruption event
• All-purpose, all-sky photometric redshifts for the Legacy Imaging Surveys Data Release 8
• Unveiling the population of dual- and lensed- AGNs at sub-arcsec separations
• The impact of early massive mergers on the chemical evolution of Milky Way-like galaxies: insights from NIHAO-UHD simulations
• Was 49b: An Overmassive AGN in a Merging Dwarf Galaxy?
• Two Candidates for Dual AGN in Dwarf-Dwarf Galaxy Mergers