Deep [ITAL]H[/ITAL]-Band Galaxy Counts and Half-Light Radii from [ITAL]Hubble Space Telescope[/ITAL]/NICMOS Parallel Observations | Zendy

Lin Yan | Zendy; Patrick J. McCarthy | Zendy; Lisa J. StorrieLombardi | Zendy; R. J. Weymann | Zendy

Open Access

Deep [ITAL]H[/ITAL]-Band Galaxy Counts and Half-Light Radii from [ITAL]Hubble Space Telescope[/ITAL]/NICMOS Parallel Observations

Author(s) -

Lin Yan,

Patrick J. McCarthy,

Lisa J. StorrieLombardi,

R. J. Weymann

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311521

Subject(s) - physics , galaxy , astrophysics , hubble deep field south , spectrograph , advanced camera for surveys , hubble space telescope , space telescope imaging spectrograph , hubble ultra deep field , hubble deep field , astronomy , telescope , magnitude (astronomy) , spectral line

We present deep galaxy counts and half-light radii from F160W($\lambda_c=1.6\mu$) images obtained with NICMOS on HST. Nearly 9 arcmin$^2$have been imaged with camera 3, with $3\sigma$ depths ranging from H = 24.3 to25.5 in a 0.6$''$ diameter aperture. The slope of the counts fainter than H~$=20$ is 0.31, and the integrated surface density to H$\leq 24.75$ is $4 \times10^5$ galaxies per square degree. The half-light radii of the galaxies declinessteeply with apparent magnitude. At H~$=24$ we are limited by both thedelivered FWHM and the detection threshold of the images.Comment: 8 pages. Accepted for publication in ApJ Letter

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