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Principal Component Analysis of the Time- and Position-Dependent Point Spread Function of the Advanced Camera for Surveys
M. J. Jee, J. P. Blakeslee, M. Sirianni +3
We describe the time- and position-dependent point spread function (PSF) variation of the Wide Field Channel (WFC) of the Advanced Camera for Surveys (ACS) with the principal compo…
The Stellar Mass Distribution in the Giant Star Forming Region NGC 346
E. Sabbi, M. Sirianni, A. Nota +8
Deep F555W and F814W Hubble Space Telescope ACS images are the basis for a study of the present day mass function (PDMF) of NGC346, the largest active star forming region in the Sm…
Progressive star formation in the young SMC cluster NGC 602
Lynn Redding Carlson, E. Sabbi, M. Sirianni +9
NGC 602 is a young stellar cluster located in a peripheral region of the Small Magellanic Cloud known as the wing. Far from the main body of the galaxy and abutting the Magellanic…
Starbursts in the Local Universe: new HST/ACS observations of the irregular galaxy NGC 4449
F. Annibali, A. Aloisi, J. Mack +5
We present photometry with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST) of stars in the Magellanic starburst galaxy NGC 4449. The galaxy has been image…
I Zw 18 revisited with HST/ACS and Cepheids: New Distance and Age
A. Aloisi, G. Clementini, M. Tosi +9
We present new V and I-band HST/ACS photometry of I Zw 18, the most metal-poor blue compact dwarf (BCD) galaxy in the nearby universe. It has been argued in the past that I Zw 18 i…