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Title:
Discovery of Two Distant Type Ia Supernovae in the Hubble Deep Field-North with the Advanced Camera for Surveys
Authors:
Blakeslee, John P.; Tsvetanov, Zlatan I.; Riess, Adam G.; Ford, Holland C.; Illingworth, Garth D.; Magee, Daniel; Tonry, John L.; Benítez, Narciso; Clampin, Mark; Hartig, George F.; Meurer, Gerhardt R.; Sirianni, Marco; Ardila, David R.; Bartko, Frank; Bouwens, Rychard; Broadhurst, Tom; Cross, Nicholas; Feldman, P. D.; Franx, Marijn; Golimowski, David A.; Gronwall, Caryl; Kimble, Randy; Krist, John; Martel, André R.; Menanteau, Felipe; Miley, George; Postman, Marc; Rosati, Piero; Sparks, William; Strolger, L.-G.; Tran, Hien D.; White, Richard L.; Zheng, Wei
Affiliation:
AA(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AB(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), AD(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AE(Lick Observatory, University of California, Santa Cruz, CA 95064; , , .), AF(Lick Observatory, University of California, Santa Cruz, CA 95064; , , .), AG(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; .), AH(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AI(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), AJ(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), AK(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AL(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AM(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AN(Bartko Science and Technology, P.O. Box 670, Mead, CO 80542-0670 .), AO(Lick Observatory, University of California, Santa Cruz, CA 95064; , , .), AP(Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel; .), AQ(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AR(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AS(Leiden Observatory, P.O. Box 9513, 2300 Leiden, Netherlands; , .), AT(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AU(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802; .), AV(NASA Goddard Space Flight Center, Greenbelt, MD 20771; .), AW(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), AX(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AY(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), AZ(Leiden Observatory, P.O. Box 9513, 2300 Leiden, Netherlands; , .), BA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), BB(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany; .), BC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), BD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), BE(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .), BF(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , , , , , , , .), BG(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; , , , , , , , , , , , , , .)
Publication:
The Astrophysical Journal, Volume 589, Issue 2, pp. 693-703. (ApJ Homepage)
Publication Date:
06/2003
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: High-Redshift, Stars: Supernovae: General, Stars: Supernovae: Individual: Alphanumeric: SN 2002dc, Stars: Supernovae: Individual: Alphanumeric: SN 2002dd
DOI:
10.1086/374797
Bibliographic Code:
2003ApJ...589..693B

Abstract

We present observations of the first two supernovae discovered with the recently installed Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST). The supernovae were found in Wide Field Camera images of the Hubble Deep Field-North taken with the F775W, F850LP, and G800L optical elements as part of the ACS guaranteed time observation program. Spectra extracted from the ACS G800L grism exposures confirm that the objects are Type Ia supernovae (SNe Ia) at redshifts z=0.47 and 0.95. Follow-up HST observations have been conducted with ACS in F775W and F850LP and with the Near-Infrared Camera and Multi-Object Spectrometer in the near-infrared F110W bandpass, yielding a total of nine flux measurements in the three bandpasses over a period of 50 days in the observed frame. We discuss many of the important issues in doing accurate photometry with the ACS. We analyze the multiband light curves using two different fitting methods to calibrate the supernova luminosities and place them on the SNe Ia Hubble diagram. The resulting distances are consistent with the redshift-distance relation of the accelerating universe model, although evolving intergalactic gray dust remains as a less likely possibility. The relative ease with which these SNe Ia were found, confirmed, and monitored demonstrates the potential ACS holds for revolutionizing the field of high-redshift SNe Ia and therefore of testing the accelerating universe cosmology and constraining the ``epoch of deceleration.''
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