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Full-Text Articles in Physical Sciences and Mathematics
Lyman-Α Imaging Of A Very Luminous Z = 2.3 Starburst Galaxy With Wfpc2, Nathan Roche, James D. Lowenthal, Bruce Woodgate
Lyman-Α Imaging Of A Very Luminous Z = 2.3 Starburst Galaxy With Wfpc2, Nathan Roche, James D. Lowenthal, Bruce Woodgate
Astronomy: Faculty Publications
We investigate the Lyα and UV continuum morphology of one of the most luminous known Lymana emitting galaxies (the 'Coup Fourré Galaxy'), associated with a z = 2.3 damped Lyα absorption system in the spectrum of the QSO PHL 957. The galaxy is observed with the Hubble Space Telescope Wide-Field Planetary Camera 2 (HST WFPC2), through a narrow filter (F410M) corresponding to rest-frame Lyα for a total exposure time of 41.2 ks, plus shorter exposures in F555W and F814W. In all three passbands, the galaxy is resolved into a close (∼0.35 arcsec) pair of two components, CFgA and CFgB, both …
Neutral Hydrogen Distribution In Merging Galaxies: Differences Between Stellar And Gaseous Tidal Morphologies, J E. Hibbard, W D. Vacca, Min S. Yun
Neutral Hydrogen Distribution In Merging Galaxies: Differences Between Stellar And Gaseous Tidal Morphologies, J E. Hibbard, W D. Vacca, Min S. Yun
Min S. Yun
As part of several H I synthesis-mapping studies of merging galaxies, we have mapped the tidal gas in the three disk-disk merger systems Arp 157 (NGC 520), Arp 220, and Arp 299 (NGC 3690). These systems differ from the majority of the mergers mapped in H I in that their stellar and gaseous tidal features do not coincide. In particular, they exhibit large stellar tidal features with little if any accompanying neutral gas and large gas-rich tidal features with little if any accompanying starlight. On smaller scales, there are striking anticorrelations in which the gaseous and stellar tidal features appear …
The Scatter In The Relationship Between Redshift And The Radio-To-Submm Spectral Index, C L. Carilli, Min S. Yun
The Scatter In The Relationship Between Redshift And The Radio-To-Submm Spectral Index, C L. Carilli, Min S. Yun
Min S. Yun
We derive the scatter in the relationship between redshift and the radio-to-submillimeter spectral index, a135.40, using the observed spectral energy distributions of 17 low-redshift star-forming galaxies. A mean galaxy model is derived, along with the rms scatter in a13.540. The scatter is roughly constant with redshift. Constant rms scatter, combined with the Ñattening of the mean a13.540-z relationship with increasing redshift, leads to increasing uncertainty for redshift estimates at high redshifts. Normalizing by the dust temperature in the manner proposed by Blain decreases the scatter in a13.540 for most of the sample, but does not remove outliers, and free-free absorption …
Sensitive Radio Observations Of High-Redshift Dusty Qsos, Min S. Yun, C L. Carilli, R Kawabe, Y Tutui, K Kohno, K Ohta
Sensitive Radio Observations Of High-Redshift Dusty Qsos, Min S. Yun, C L. Carilli, R Kawabe, Y Tutui, K Kohno, K Ohta
Min S. Yun
We present sensitive radio continuum imaging at 1.4 and 4.9 GHz of seven high-redshift QSOs selected for having a 240 GHz continuum detection, which is thought to be thermal dust emission. We detect radio continuum emission from four of the sources: BRI 0952-0115, BR 1202-0725, LBQS 1230+1627B, and BRI 1335-0417. The radio source in BR 1202-0725 is resolved into two components, coincident with the double millimeter and CO sources. We compare the results at 1.4 and 240 GHz to empirical and semianalytic spectral models based on star-forming galaxies at low redshift. The radio-to-submillimeter spectral energy distribution (SED) for BR 1202-0725, …