A hyper extremely red object in the field near 53W002

Myungshin Im, Toru Yamada, Ichi Tanaka, Masaru Kajisawa

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14 Citations (Scopus)


Hyper extremely red objects (HEROs) are objects that are very red in near-IR colors (J-K ≳ 3). They are speculated to be intrinsically red galaxies at z ≳ 2 or Lyman break galaxies at z > 10. We report the discovery of a HERO in the field that includes a known radio galaxy, 53W002, and a possible cluster of galaxies both at z = 2.39. The HERO, which we name HERO J171411.91+501541.8, or 53W002-HERO1 for brevity, is visible in the Bubble Space Telescope Near-Infrared Camera and Multi-Object Spectrometer H-band data and deep K′-band data from the Subaru Telescope (K′ ≃ 21.5 mag) but not visible in B-, V-, I-, and J-band images (J-K > 4.45, 2 σ). Its spectral energy distribution is consistent with that of a dusty star-forming or old galaxy at z ≃ 2.4, which may suggest that 53W002-HER01 is a member of the group of galaxies associated with 53W002. Alternatively, the HERO could be at z ≃ 12.5, if its red color is due to the redshifted Lyman break. If 53W002-HER01 is an old galaxy at z ∼ 2.4, the implied stellar age is ∼2-3 Gyr, meaning that stars in the HERO formed at the reionization epoch of z ≳ 10.

Original languageEnglish
Pages (from-to)L19-L22
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2002 Oct 10
Externally publishedYes


  • Cosmology: observations
  • Early universe
  • Galaxies: formation
  • Galaxies: high-redshift

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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