NDLI: Deep Galaxy Surveys in the 9150 Å Airglow Window

Content Provider	Springer Nature Link
Author	Stockton, Alan
Copyright Year	1999
Abstract	We describe the current status of two complementary programs to search for objects with strong emission lines in a 300 Å gap, centered at 9150 Å, in the strong airglow emission. Both programs are being carried out with LRIS on the Keck II telescope. The first of these uses broad-band and narrow-band filter photometry to select candidates, followed by multi-slit spectroscopy through the same narrow-band filter to limit the band pass and allow a dense packing of slits. The second uses six parallel long slits to carry out a blind spectroscopic search through the filter isolating the 9150 Å window. The total slit area covered ranges from 1 to 3.5 square arcmin per pointing, depending on slit width, and we can obtain 3 σ detections of emission lines of <2 × 10-18 erg cm-2 s-1 in a 12000 s observation with1″5 slits. Because, for faint objects in both programs, we are most sensitive to strong lines with large equivalent widths, most of our detections will be restricted to a few specific emission lines at certain discrete redshifts. One of the more interesting possibilities is Ly-α at z ∼ 6.5. However, even with 12000 s integrations on the Keck II telescope, our narrow-band imaging does not pick up objects with emission-line fluxes ≲10-17 erg cm-2 s-1. With this limit, at z ∼ 6.5, we would pick up only the most luminous of the z > 5 objects discovered so far. Our blind spectroscopic search potentially has a better chance of discovering such objects, but we have not yet found any definite examples in the limited area of the sky we have covered to date. We discuss the criteria for identifying Ly-α emission in noisy spectra and emphasize how high-ionization dwarf galaxies at low redshift can be mistaken for Ly-α candidates under certain conditions.
Starting Page	209
Ending Page	216
Page Count	8
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	269
Issue Number	0
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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