Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.7008b&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #70.08; Bulletin of the American Astronomical Society, Vol. 30, p.927
Astronomy and Astrophysics
Astronomy
4
Scientific paper
We present the results of deep, high-dispersion Keck/LRIS spectroscopy on the brightest ``U-drop'' in the Hubble Deep Field. This z=2.80 galaxy, HDF 4-555.1, has been dubbed ``the Hot Dog'' because of its highly-elongated morphology. Our LRIS optical spectra (lambda /Delta lambda ~ 1000) sample the rest-frame UV (1090 - 1890 Angstroms ), a region devoid of strong forbidden emission lines. However, many of the resonance lines associated with hot stellar winds do appear, although their P Cygni profiles are less extended in velocity than those observed in some local star-bursts. The overall rest-UV continuum indicates that the Hot Dog is an actively star-forming galaxy, albeit with internal dust extinction of E(B-V)~ 0.1(m) , while the presence of high-ionization Nriptsize V in emission demands at least some O-stars. Lyalpha is completely suppressed, and the absorption profile can be fit by a combination of stellar photospheric absorption and a modest interstellar hydrogen column of N(H I)~ 10(20) cm(-2) (a borderline damped system). The Hot Dog exhibits some of the strongest interstellar absorption features seen in the Lyman-break population. We also serendipitously discovered in our long-slit spectroscopy a Lyalpha line emission galaxy (W0 ~ 30 Angstroms ) at a redshift within 1000 km s(-1) of the Hot Dog, and a projected separation of 17.6 h(-1) kpc (h=Hdeg/100 km s(-1) Mpc(-1) , qdeg=0.5). The flux in the Ly-alpha line of this companion galaxy is 3x 10(-17) erg cm(-2) s(-1) , and the rest-UV continuum suggests a star formation rate of SFR_UV ~ 1.4 h(-2) Msun yr(-1) . Finally, our spatially-resolved spectroscopy reveals Mgriptsize II lambda lambda 2796/2803 Angstroms and Feriptsize II lambda 2600 Angstroms absorption by a foreground system at z=1.239. The absorption is only pronounced in the northern component of the Hot Dog, and arises from a galaxy 2 arcsec away. The absence of strong Mgriptsize II absorption in the southern component enables us to constrain the physical size of the Lyman limit system halo of this galaxy to be r<13.5 h(-1) kpc.
Bunker Andrew J.
Dey Arjun
Spinrad Hyron
Steidel Charles C.
Stern Daniel
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