EGSD2 J142033.66+525917.5

EGSD2 J142033.66+525917.5 is a dual-active galactic nucleus (AGN) at z-0.709 in the Extended Groth Strip.[1][2]

Description

The galaxy is heavily redshifted, and has an absolute magnitude of -21.0, with a rest frame colour of 1.38. The spectrum displays double peaked emission lines of great strength, and much weaker H-beta emission. The two peaks are separated by a velocity of about 630 km/s-1 and are traced to 2 well-defined regions in space, both resolved in the DEIMOS spectrum, with a rough distance of about 3913 light years, or 1.2 kiloparsecs. The nucleus is in an early-type galaxy, with a possibly interrupted structure, and matching up to a remnant of a galactic merger in which energy loss has not appeared to have taken place.[1]

Discovery

The AGN was discovered with a series of observations of a one-dimensional Deep2 spectrum from the Keck II telescope at the W.M Keck observatory in Hawai'i. The outstanding properties of the spectrum was the pair of double-peaked emission lines, with respective wavelength ratios of Lambda-4959 and Lambda-5007. The peaks of the Lambda-5007 observation were about 17.8 angstroms away from each other. The spectrum also had a promising amount of H-beta emission, but it was unidentifiable due to Poisson Noise. There were no other emission lines, but the entirety of the observed wavelengths (6750-8980 angstroms) showed a great amount of stellar continuum absorption features.

References

  1. ^ a b Gerke, Brian F.; Newman, Jeffrey A.; et al. (May 2007). "The DEEP2 Galaxy Redshift Survey: AEGIS Observations of a Dual AGN at z = 0.7". The Astrophysical Journal. 660 (1): L23–L26. arXiv:astro-ph/0608380. Bibcode:2007ApJ...660L..23G. doi:10.1086/517968.
  2. ^ Stefanon, Mauro; Yan, Haojing; Mobasher, Bahram; Barro, Guillermo; Donley, Jennifer L.; Fontana, Adriano; Hemmati, Shoubaneh; Koekemoer, Anton M.; Lee, BoMee; Lee, Seong-Kook; Nayyeri, Hooshang; Peth, Michael; Pforr, Janine; Salvato, Mara; Wiklind, Tommy (2017-04-01). "CANDELS Multi-wavelength Catalogs: Source Identification and Photometry in the CANDELS Extended Groth Strip". The Astrophysical Journal Supplement Series. 229 (2): 32. arXiv:1703.05768. Bibcode:2017ApJS..229...32S. doi:10.3847/1538-4365/aa66cb. ISSN 0067-0049.
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