Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...666..663b&link_type=abstract
The Astrophysical Journal, Volume 666, Issue 2, pp. 663-673.
Astronomy and Astrophysics
Astronomy
25
Cosmology: Diffuse Radiation
Scientific paper
We revise the measurements in our previous work of foreground zodiacal light (ZL) and diffuse Galactic light (DGL) that were used to measure the extragalactic background light (EBL). These changes result in a decrease of 8 and an increase of 0.3 in units of 10-9 ergs s-1 cm-2 sr-1 Å-1 (``cgs'' units) in the ZL and DGL flux, respectively. We therefore obtain revised values for the EBL of 6+/-4, 10+/-5, and 7+/-4 cgs in the HST WFPC2 U (F300W), V (F555W), and I (F814W) bands, respectively, from sources fainter than mV~23 AB mag. The revisions are dominated by the details of the tropospheric scattering models used to measure the ZL. We discuss these results in the context of faint number counts and diffuse EBL measurements at other wavelengths. In particular, we note that unless the slope of the galaxy counts increases beyond mV~30 AB mag, unresolved sources will contribute <0.2 cgs, which is far below the uncertainties achievable for any diffuse EBL measurement in the foreseeable future. Therefore, the best constraints on faint sources come from the resolved sources themselves. As in our earlier work, models are still required to derive the bolometric EBL (0.1-1000 μm) due to uncertainties in the mid-infrared consequently, our previous discussions of the bolometric EBL are not affected by the revisions presented here. Finally, we discuss the nature of the extended point-spread function (PSF) of ground-based telescopes and its impact on surface brightness measurements. In particular, we show that the slope and amplitude of extended PSFs vary considerably between telescopes and with time. We find no conclusive, single cause of extended PSFs, although atmospheric scattering is ruled out.
No associations
LandOfFree
The Optical Extragalactic Background Light: Revisions and Further Comments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Optical Extragalactic Background Light: Revisions and Further Comments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Optical Extragalactic Background Light: Revisions and Further Comments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1011102