TY - JOUR
T1 - A redshift z≈5.4 lyα emitting galaxy with linear morphology in the GRAPES/Hubble ultra deep field
AU - Rhoads, James E.
AU - Panagia, Nino
AU - Windhorst, Rogier
AU - Malhotra, Sangeeta
AU - Pirzkal, Norbert
AU - Xu, Chun
AU - Strolger, Louis Gregory
AU - Bergeron, Louis E.
AU - Daddi, Emanuele
AU - Ferguson, Harry
AU - Gardner, Jonathan P.
AU - Gronwall, Caryl
AU - Haiman, Zoltan
AU - Koekemoer, Anton
AU - Kümmel, Martin
AU - Moustakas, Leonidas A.
AU - Pasquali, Anna
AU - Riess, Adam
AU - Di Serego Alighieri, Sperello
AU - Stiavelli, Massimo
AU - Tsvetanov, Zlatan
AU - Vernet, Joel
AU - Walsh, Jeremy
AU - Yan, Haojing
PY - 2005/3/10
Y1 - 2005/3/10
N2 - We have discovered an extended Lyα plume (UDF 5225) associated with a compact source at redshift z ≈ 5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Science (GRAPES) project. The spatial extent of the emission is about 6×1.5 kpc (1'' × 0''25). Combining our grism data and the broadband images from the Hubble Ultra Deep Field (UDF) images, we find a Lyα line flux of ∼2.2×10-17 ergs cm-2 s-1 and surface brightness ∼7× 10 -17ergs cm-2 s-1 arcsec-2. The UDF images show diffuse continuum emission associated with UDF 5225, including three embedded knots. The morphology of UDF 5225 is highly suggestive of a galaxy in assembly. It is possible that the prominent Lyα emission from this object is due to an active nucleus, and that we are seeing the simultaneous growth through accretion of a galaxy and its central black hole. Follow-up observations at higher spectral resolution could test this hypothesis.
AB - We have discovered an extended Lyα plume (UDF 5225) associated with a compact source at redshift z ≈ 5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Science (GRAPES) project. The spatial extent of the emission is about 6×1.5 kpc (1'' × 0''25). Combining our grism data and the broadband images from the Hubble Ultra Deep Field (UDF) images, we find a Lyα line flux of ∼2.2×10-17 ergs cm-2 s-1 and surface brightness ∼7× 10 -17ergs cm-2 s-1 arcsec-2. The UDF images show diffuse continuum emission associated with UDF 5225, including three embedded knots. The morphology of UDF 5225 is highly suggestive of a galaxy in assembly. It is possible that the prominent Lyα emission from this object is due to an active nucleus, and that we are seeing the simultaneous growth through accretion of a galaxy and its central black hole. Follow-up observations at higher spectral resolution could test this hypothesis.
KW - Galaxies: Individual (UDF 5225)
KW - Galaxies: Interactions
KW - Galaxies: frmation
KW - Galaxies: hgh-redshift
KW - Galaxies: sarburst
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U2 - 10.1086/427622
DO - 10.1086/427622
M3 - Article
AN - SCOPUS:18444372946
SN - 0004-637X
VL - 621
SP - 582
EP - 586
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 I
ER -