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Hubble Space Telescope
WFPC2 STAN

+----------------------------------------------------------+
| WFPC2
| STScI Analysis Newsletter
| WFPC2 STAN 52
| July 2002
+----------------------------------------------------------+

CONTENTS:

- Cycle 12 Edition of the WFPC2 Instrument Handbook Available

- Results of SMOV3B
    - SMOV3B WFPC2 Lyman-Alpha Throughput Check
    - SMOV3B WFPC2 Photometry Check
    - SMOV3B WFPC2 UV Contamination Monitoring and Throughput 
      Check
    - SMOV3B Flat Field Verification
    - SMOV3B Check of the WFPC2 Point-Spread-Function

- Charge Transfer Efficiency for Very Faint Objects and a 
  Reexamination of the Long-vs-Short Problem for the WFPC2

- New CTE Formula from Dolphin

- Anomalous PHOTFLAM Value for F656N Filter

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Cycle 12 Edition of the WFPC2 Instrument Handbook Available

-L. Lubin

The WFPC2 Instrument Handbook for Cycle 12 (Version 7.0) will 
be released this summer. Major revisions include : (1) updated
information on the CLOCKS=YES mode, (2) the status of the 
anomalous rotational offset for many WFPC2 filters, (3) the 
presentation of the most up-to-date analyses and correction 
formula for the CTE effect, (4) a discussion of the latest 
conclusions on the apparent "Long vs. Short" anomaly, (5) a 
description of the new options available in the on-line Exposure 
Time Calculator, (6) a description of the latest flat field 
files and their improved accuracy, and (7) a summary of the
Cycle 11 calibration plan.

Results of SMOV3B

  SMOV3B WFPC2 Lyman-Alpha Throughput Check

  -L. Lubin, B. Whitmore, A. M. Koekemoer, I. Heyer

  The far-UV throughput of WFPC2 was monitored on March 23, 2002, 
  for any signs of unexpected throughput degradation following 
  Servicing Mission 3b. No significant changes were detected.

  SMOV3B WFPC2 Photometry Check

  -B. Whitmore and I. Heyer

  A check of the photometric throughput of the WFPC2 was 
  performed March 31, 2002 (program ID: 8953). The standard 
  star GRW+70d5824 was observed with a selection of filters 
  and the standard star was centered in each of the four CCDs. 
  The data indicate that any changes in the photometric 
  throughputs due to SM3B are less than 1% in most of the 
  visible wavelength filters, and less than a few percent in 
  the UV filters. The distribution shows a mean value of 0.34 
  +/- 0.26 sigma (where sigma is defined separately for each 
  filter-chip combination) for all the observations, 
  essentially consistent with an unchanged photometric 
  throughput. This corresponds to about 0.4% on an absolute 
  scale. The long-term throughput decline is consistent with 
  the expected CTE loss. The response of the WFPC2 has 
  essentially not changed.

  SMOV3B WFPC2 UV Contamination Monitoring and Throughput Check
  
  -A. M. Koekemoer, S. Gonzaga, L. Lubin, B. Whitmore, I. Heyer

  The throughput of the WFPC2 cameras in the UV is potentially 
  susceptible to significant decreases as a result of 
  contaminants deposited on the cold CCD windows, once the 
  instrument has been cooled down to -88 C. An important part 
  of our SMOV3B checkout involved intensive monitoring of this 
  contamination using the F170W filter, to ensure that the 
  throughput never dropped below levels that can safely be 
  removed by the regular decontamination procedures. We report 
  here the results of these measurements, showing that the 
  throughput remained at safe levels throughput SMOV3B, and in 
  addition demonstrating that the decontamination procedures 
  during SMOV3B returned the throughput to its nominal levels. 
  We also find that the daily contamination rates have now 
  returned to their pre-SMOV3B levels.

  SMOV3B Flat Field Verification

  -A. M. Koekemoer and I. Heyer

  We compare WFPC2 Earthflats taken before and after the 2002 
  Servicing Mission 3B. Most of the field-of-view shows no 
  change (<0.3%) in flat field calibration. The only changes 
  on large scales are at very low levels (<0.1-0.2%) and are 
  likely attributable to long-term changes in the camera 
  geometry, rather than SM3B.

  SMOV3B Check of the WFPC2 Point-Spread-Function

  -V. Kozhurina-Platais, L.M. Lubin, and A.M. Koekemoer

  We examine the Point-Spread-Function (PSF) of the WFPC2 
  after the Servicing Mission 3b using dithered observations 
  of the rich globular cluster, Omega Cen. Comparisons to 
  previous measurements of the PSF which were made after the 
  last two servicing missions (SM2 and SM3a) indicate that 
  no significant variations in the PSF have occurred. We 
  also present an analysis of the shape of the PSF as a 
  function of five positions on the Planetary Camera (PC) 
  chip.

Charge Transfer Efficiency for Very Faint Objects and a 
Reexamination of the Long-vs-Short Problem for the WFPC2

-B. Whitmore and I. Heyer

An analysis of WFPC2 observations of Omega Cen and NGC 2419 
leads to the following results.
1. The correction formula developed by Whitmore, Heyer, and 
Casertano (1999; hereafter WHC99) does a reasonable job of 
correcting for CTE loss down to extremely low count levels 
(i.e., so faint you cannot actually see the object but only 
know of its existence from longer exposures). There is no 
sharp cutoff to the detection threshold for very faint stars.
2. A comparison of the WHC99 formula with the Dolphin (2000b; 
hereafter D00) formula shows reasonable agreement for bright 
and moderately bright stars, with the D00 formula giving 
better results. However, at very faint levels, the D00 
formula overestimates, and the WHC99 formula underestimates, 
the correction by tens of percent. Our current recommendation 
is to use the D00 formula for CTE loss correction.
3. A reexamination of the long-vs-short nonlinearity shows 
that the effect is very small (a few percent) or nonexistent
for uncrowded fields, with less than ~ 1000 stars per chip. 
However, for crowded fields, with ~ 10,000 stars per chip,
apparent nonlinearities of tens of percent are possible. The 
most likely explanation is that this is due to an overestimate 
of the sky measurement in the short exposure, which is 
probably due to the presence of scattered light around bright 
stars and the subsequent improvement in CTE loss in these 
regions. No correction formula has been derived in the current 
study since the effect is dependent on the analysis parameters 
(aperture size) and probably also on the photometry package 
(psf-fitting, aperture photometry, ...).
4. Preflashing may be a useful method of reducing the effects 
of CTE loss for certain observations (moderately bright 
objects on very faint backgrounds), but the effects of added 
noise and longer overheads limit its effectiveness.
5. The detection thresholds for typical broad band 
observations have been reduced by ~ 0.1 - 0.2 mag in the ~7 
years since WFPC2 was launched. For worst-case observations 
(F336W) the effect is currently ~ 0.4 magnitudes.

New CTE Formula from Dolphin

-L. Lubin

We highlight recent work on the Charge Transfer Efficiency 
(CTE) problem for WFPC2 by Andrew Dolphin (NOAO). Current 
CTE correction formulae are of a functional form that assumes 
the charge loss per pixel is constant as a star is read out.
For a CTE correction that is itself a function of counts, 
this assumption is not strictly true. In most cases, however, 
the CTE loss is sufficiently small that the error introduced 
by assuming a constant CTE loss per pixel is negligible, and, 
thus, such a formula provies an adequate approximation.

However, for very faint stars, the CTE loss can exceed half 
of the star's initial brightness, thus causing the charge 
loss per pixel to change significantly as the star reads out.
The latest correction equations by Dolphin (2002) take into 
account the fact that the magnitude loss per pixel is not 
constant as the star reads out and, therefore, provide more 
accurate corrections for the faintest stars. His updated 
formulae were posted on May 31, 2002 and can be found on his 
webpage at http://www.noao.edu/staff/dolphin/wfpc2_calib/.

Using this new correction, the overestimation of the Dolphin 
(2001) CTE correction reported by Whitmore and Heyer (2002; 
WFPC2 ISR 02-03) is eliminated to within the uncertainty of 
their measurement. Therefore, our current recommendation is 
to use the Dolphin (2002) formula for the CTE loss correction.

Anomalous PHOTFLAM Value for F656N Filter

-L. Lubin

Based on a Help Desk call, we have discovered that the value 
listed in the PHOTFLAM keyword in the image headers of data 
taken in the F656N filter is incorrect. The discrepancy of 
approximately 4% was due to a coarse wavelength grid being 
used to compute the keyword value. We note that the values 
of PHOTFLAM given in the HST Data Handbook for WFPC2 (V4.0) 
or derived from computing it directly via SYNPHOT are and 
have always been correct. In addition, no inconsistencies 
have been detected with the PHOTFLAM value given in the 
image headers for the other narrow band filters.

It is not known how long this problem has existed; however, 
as of May 2002, this error has been corrected in the 
On-The-Fly Reprocessing (OTFR) system. Therefore, all data 
retrieved from the archive after May 2002 will have the 
correct PHOTFLAM value for the F656N filter.

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| Recent WFPC2-related Preprints
+----------------------------------------------------------+

We draw your attention to these papers, based on WF/PC and 
WFPC2 data, that will appear in the next few months. This 
list includes all preprints received by the STScI Library 
not yet published in the journals. Please remember to
include our Library in your preprint distribution list.

BALLY, J.; HEATHCOTE, S.; REIPURTH, B.; MORSE, J.; HARTIGAN, 
P.; SCHWARTZ, R. "Hubble Space Telescope Observations of 
Proper Motions in Herbig-Haro Objects 1 and 2" AJ 123: 
2627-2657, 2002

BALOGH, M.L.; SMAIL, I.; BOWER, R.G.; ZIEGLER, B.L.; SMITH, 
G.P.; DAVIES, R.L.; GAZTELU, A.; KNEIB, J.-P.; EBELING, H. 
"Distinguishing Local and Global Influences on Galaxy 
Morphology: a Hubble Space Telescope Comparison of High and 
Low X-ray Luminosity Clusters" ApJ 566: 123-136, 2002

BARMBY, P.; HOLLAND, S.; HUCHRA, J.P. "M31 Globular Clusters 
in the Hubble Space Telescope Archive. II. Structural 
Parameters" AJ 123: 1937-1952, 2002

BELLAZZINI, M.; FUSI PECCI, F.; MESSINEO, M.; MONACO, L.; 
ROOD, R.T. "Deep Hubble Space Telescope WFPC2 Photometry of 
NGC 288. I. Binary Systems and Blue Stragglers" AJ 123:
1509-1527, 2002

BELLAZZINI, M.; FUSI PECCI, F.; MONTEGRIFFO, P.; MESSINEO, M.; 
MONACO, L.; ROOD, R.T. "Deep Hubble Space Telescope WFPC2 
Photometry of NGC 288. II. The Main-Sequence Luminosity 
Function" AJ 123: 2541-2551, 2002

BENEDICT, G.F.; HOWELL, D.A.; JORGENSEN, I.; KENNEY, J.D.P.; 
SMITH, B.J. "NGC 4314. IV. Photometry of Star Clusters with 
the Hubble Space Telescope. History of Star Formation in the 
Vicinity of a Nuclear Ring" AJ 123: 1411-1432, 2002

BERNSTEIN, R.A.; FREEDMAN, W.L.; MADORE, B.F. "The First 
Detections of the Extragalactic Background Light at 3000, 
5500, and 8000 A. I. Results" ApJ 571: 56-84, 2002

BESWICK, R.J.; PEDLAR, A.; HOLLOWAY, A.J. "A Radio Study of 
Neutral Gas and Dust in the Radio Galaxy 3C 293" MNRAS 329: 
620-628, 2002

BILLETT, O.H.; HUNTER, D.A.; ELMEGREEN, B.G. "Compact Star 
Clusters in Nearby Dwarf Irregular Galaxies" AJ 123: 
1454-1475, 2002

BIRETTA, J.A.; MARTEL, A.R.; MCMASTER, M.; SPARKS, W.B.; BAUM, 
S.A.; MACCHETTO, F.; MCCARTHY, P.J. "An HST Emission-Line 
Imaging Survey of 3CR Radio Galaxies" NewAR 46: 181-186, 2002

BLOOM, J.S.; KULKARNI, S.R.; PRICE, P.A.; REICHART, D.; GALAMA, 
T.J.; SCHMIDT, B.P.; FRAIL, D.A.; BERGER, E.; MCCARTHY, P.J.; 
CHEVALIER, R.A.; WHEELER, J.C.; HALPERN, J.P.; FOX, D.W.; 
DJORGOVSKI, S.G.; HARRISON, F.A.; SARI, R.; AXELROD, T.S.; 
KIMBLE, R.A.; HOLTZMAN, J.; HURLEY, K.; FRONTERA, F.; PIRO, L.; 
COSTA, E. "Detection of a Supernova Signature Associated with 
GRB 011121" ApJ 572: L45-L49, 2002

BOKER, T.; LAINE, S.; VAN DER MAREL, R.P.; SARZI, M.; RIX, 
H.-W.; HO, L.C.; SHIELDS, J.C. "A Hubble Space Telescope Census 
of Nuclear Star Clusters in Late-Type Spiral Galaxies. I.
Observations and Image Analysis" AJ 123: 1389-1410, 2002

BOND, H.E.; POLLACCO, D.L. "HST Observations of Sakurai's 
Object (V4334 Sgr) and Related Stars" Ap&SS 279: 31-37, 2002

BROCKSOPP, C.; BODE, M.F.; EYRES, S.P.S.; CROCKER, M.M.; 
DAVIS, R.; TAYLOR, A.R. "The Central Binary and Surrounding 
Nebula of the Symbiotic Star V1016 Cygni" ApJ 571: 947-954, 
2002

BROTHERTON, M.S.; GRABELSKY, M.; CANALIZO, G.; VAN BREUGEL, 
W.; FILIPPENKO, A.V.; CROOM, S.; BOYLE, B.; SHANKS, T. 
"Hubble Space Telescope Imaging of the Poststarburst Quasar
UN J1025-0040: Evidence for Recent Star Formation" PASP 114: 
593-601, 2002

CANNON, J.M.; SKILLMAN, E.D.; GARNETT, D.R.; DUFOUR, R.J. 
"Dust in I Zw 18 from Hubble Space Telescope Narrowband 
Imaging" ApJ 565: 931-940, 2002

CAPETTI, A.; CELOTTI, A.; CHIABERGE, M.; DE RUITER, H.R.; 
FANTI, R.; MORGANTI, R.; PARMA, P. "The HST Survey of the B2 
Sample of Radio-Galaxies: Optical Nuclei and FR I/BL Lac
Unified Scheme" A&A 383: 104-111, 2002

CHEN, C.-H.R.; CHU, Y.-H.; GRUENDL, R.; LAI, S.-P. "A 
Critical Examination of Hypernova Remnant Candidates in M101. 
II. NGC 5471B" AJ 123: 2462-2472, 2002

CONTINI, M.; RADOVICH, M.; RAFANELLI, P.; RICHTER, G.M. 
"The Interpretation of the Emission Spectra of the Seyfert 2 
Galaxy NGC 7130: Determination of the Active Galactic Nucleus 
and Starburst Contributions" ApJ 572: 124-139, 2002

CRAMPTON, D.; SCHADE, D.; HAMMER, F.; MATZKIN, A.; LILLY, 
S.J.; LE FEVRE, O. "The Gravitational Lens CFRS 03.1077" ApJ 
570: 86-91, 2002

DE GRIJS, R.; GILMORE, G.F.; JOHNSON, R.A.; MACKEY, A.D. 
"Mass Segregation in Young Compact Star Clusters in the Large 
Magellanic Cloud -- II. Mass Functions" MNRAS 331: 245-258,
2002

DE GRIJS, R.; JOHNSON, R.A.; GILMORE, G.F.; FRAYN, C.M. 
"Mass Segregation in Young Compact Star Clusters in the Large 
Magellanic Cloud -- I. Data and Luminosity Functions" MNRAS
331: 228-244, 2002

DOHM-PALMER, R.C.; SKILLMAN, E.D.; MATEO, M.; SAHA, A.; 
DOLPHIN, A.; TOLSTOY, E.; GALLAGHER, J.S.; COLE, A.A. "Deep 
Hubble Space Telescope Imaging of Sextans A. I. The Spatially
Resolved Recent Star Formation History" AJ 123: 813-831, 2002

DOLPHIN, A.E.; KENNICUTT, R.C. JR. "Hubble Space Telescope 
Survey of Clusters in Nearby Galaxies. I. Detection and 
Photometry" AJ 123: 207-224, 2002

DONAHUE, M.; MACK, J. "HST NICMOS and WFPC2 Observations of 
Molecular Hydrogen and Dust in the Central Galaxies in 
Cluster Cooling Flows" NewAR 46: 155-158, 2002

DURRELL, P.R.; CIARDULLO, R.; FELDMEIER, J.J.; JACOBY, G.H.; 
SIGURDSSON, S. "Intracluster Red Giant Stars in the Virgo 
Cluster" ApJ 570: 119-131, 2002

EDMONDS, P.D.; HEINKE, C.O.; GRINDLAY, J.E.; GILLILAND, R.L. 
"Hubble Space Telescope Detection of a Quiescent Low-Mass 
X-ray Binary Companion in 47 Tucanae" ApJ 564: L17-L20, 2002

ELMEGREEN, D.M.; CHROMEY, F.R.; MCGRATH, E.J.; OSTENSON, J.M. 
"Circumnuclear Star Formation in the Spiral Galaxy NGC 3310" 
AJ 123: 1381-1388, 2002

ELMEGREEN, D.M.; ELMEGREEN, B.G.; EBERWEIN, K.S. "Dusty 
Acoustic Turbulence in the Nuclear Disks of Two Liner Galaxies 
NGC 4450 and NGC 4736" ApJ 564: 234-243, 2002

FARRAH, D.; VERMA, A.; OLIVER, S.; ROWAN-ROBINSON, M.; MCMAHON, 
R. "Hubble Space Telescope Wide Field Planetary Camera 2 
Observations of Hyperluminous Infrared Galaxies" MNRAS 329: 
605-619, 2002

FAURE, C.; COURBIN, F.; KNEIB, J.P.; ALLOIN, D.; BOLZONELLA, 
M.; BURUD, I. "The Lensing System towards the Doubly Imaged 
Quasar SBS 1520+530" A&A 386: 69-86, 2002

FEINSTEIN, C.; MACCHETTO, F.D.; MARTEL, A.R.; SPARKS, W.B. 
"Filaments and Ionized Gas in the Vicinity of 3C 244.1" ApJ 
565: 125-130, 2002

FELTZING, S.; JOHNSON, R.A. "A New, Cleaner Colour-Magnitude 
Diagram for the Metal-Rich Globular Cluster NGC 6528. 
Velocity Dispersion in the Bulge, Age and Proper Motion of 
NGC 6528" A&A 385: 67-86, 2002

FERGUSON, H.C.; DICKINSON, M.; PAPOVICH, C. "Lyman Break 
Galaxies and the Reionization of the Intergalactic Medium" 
ApJ 569: L65-L68, 2002

FORTE, J.C.; BASSINO, L.P.; VEGA, E.I.; PELLIZZA GONZALEZ, 
L.J.; CELLONE, S.A.; MENDEZ, M.R. "A Polarimetric Survey for 
Dust in 47 Tucanae" AJ 123: 3263-3276, 2002

FRANSSON, C.; CHEVALIER, R.A.; FILIPPENKO, A.V.; LEIBUNDGUT, 
B.; BARTH, A.J.; FESEN, R.A.; KIRSHNER, R.P.; LEONARD, D.C.; 
LI, W.; LUNDQVIST, P.; SOLLERMAN, J.; VAN DYK, S.D. "Optical 
and Ultraviolet Spectroscopy of SN 1995N: Evidence for Strong 
Circumstellar Interaction" ApJ 572: 350-370, 2002

GAL-YAM, A.; MAOZ, D.; SHARON, K. "Supernovae in Deep Hubble 
Space Telescope Galaxy Cluster Fields: Cluster Rates and 
Field Counts" MNRAS 332: 37-48, 2002

GALLAGHER, J.S.; SPARKE, L.S.; MATTHEWS, L.D.; FRATTARE, L.M.; 
ENGLISH, J.; KINNEY, A.L.; IODICE, E.; ARNABOLDI, M. "Wide 
Field Planetary Camera 2 Observations of the Polar Ring 
Galaxy NGC 4650A" ApJ 568: 199-209, 2002

GRUENDL, R.A.; CHU, Y.-H.; VAN DYK, S.D.; STOCKDALE, C.J. 
"Narrow Lines in Type II Supernovae: Probing the Circumstellar 
Nebulae of the Progenitors" AJ 123: 2847-2856, 2002

HARRIS, W.E.; HARRIS, G.L.H. "The Halo Stars in NGC 5128. III. 
An Inner Halo Field and the Metallicity Distribution" AJ 123: 
3108-3123, 2002

HENNEY, W.J.; O'DELL, C.R.; MEABURN, J.; GARRINGTON, S.T.; 
LOPEZ, J.A. "Mass Loss and Jet Outflow in the Orion Nebula 
Proplyd LV 2" ApJ 566: 315-331, 2002

HEYDARI-MALAYERI, M.; CHARMANDARIS, V.; DEHARVENG, L.; 
MEYNADIER, F.; ROSA, M.R.; SCHAERER, D.; ZINNECKER, H. 
"Resolving the Compact H II Regions in N160A with HST" A&A 
381: 941-950, 2002

HUTCHINGS, J.B.; FRENETTE, D.; HANISCH, R.; MO, J.; DUMONT, 
P.J.; REDDING, D.C.; NEFF, S.G. "Imaging of z ~ 2 QSO Host 
Galaxies with the Hubble Space Telescope" AJ 123: 2936-2944, 
2002

HUTCHINGS, J.B.; SAINTONGE, A.; SCHADE, D.; FRENETTE, D. 
"Galaxy Morphology in the Rich Cluster Abell 2390" AJ 123: 
1826-1837, 2002

IM, M.; SIMARD, L.; FABER, S.M.; KOO, D.C.; GEBHARDT, K.; 
WILLMER, C.N.A.; PHILLIPS, A.; ILLINGWORTH, G.; VOGT, N.P.; 
SARAJEDINI, V.L. "The DEEP Groth Strip Survey. X. Number
Density and Luminosity Function of Field E/S0 Galaxies at 
z < 1" ApJ 571: 136-171, 2002

IODICE, E.; ARNABOLDI, M.; DE LUCIA, G.; GALLAGHER, J.S. III; 
SPARKE, L.S.; FREEMAN, K.C. "The Puzzle of the Polar Structure 
in NGC 4650A" AJ 123: 195-206, 2002

JESTER, S.; ROSER, H.-J.; MEISENHEIMER, K.; PERLEY, R. "X-rays 
from the Jet in 3C 273: Clues from the Radio-Optical Spectra" 
A&A 385: L27-L30, 2002

KARACHENTSEV, I.D.; SHARINA, M.E.; DOLPHIN, A.E.; GREBEL, 
E.K.; GEISLER, D.; GUHATHAKURTA, P.; HODGE, P.W.; 
KARACHENTSEVA, V.E.; SARAJEDINI, A.; SEITZER, P. "New 
Distances to Galaxies in the Centaurus A Group" A&A 385: 
21-31, 2002

KIM, M.; KIM, E.; LEE, M.G.; SARAJEDINI, A.; GEISLER, D. 
"Determination of the Distance to M33 Based on the Tip of 
the Red Giant Branch and the Red Clump" AJ 123: 244-254, 2002

KOEKEMOER, A.M.; GROGIN, N.A.; SCHREIER, E.J.; GIACCONI, R.; 
GILLI, R.; KEWLEY, L.; NORMAN, C.; ZIRM, A.; BERGERON, J.; 
ROSATI, P.; HASINGER, G.; TOZZI, P.; MARCONI, A. "Hubble 
Space Telescope Imaging in the Chandra Deep Field-South. 
II. WFPC2 Observations of an X-ray Flux-Limited Sample from 
the 1 Million Second Chandra Catalog" ApJ 567: 657-671, 2002

KOEKEMOER, A.M.; O'DEA, C.P.; SARAZIN, C.L.; MCNAMARA, B.R.; 
DONAHUE, M.; VOIT, M.; BAUM, S.A.; GALLIMORE, J.F. 
"Interactions Between the Abell 2597 Central Radio Source 
and Dense Gas in Its Host Galaxy" NewAR 46: 149-153, 2002

KOOPMANS, L.V.E.; TREU, T. "The Stellar Velocity Dispersion 
of the Lens Galaxy in MG 2016+112 at z = 1.004" ApJ 568: 
L5-L8, 2002

KRIST, J.E.; STAPELFELDT, K.R.; WATSON, A.M. "Hubble Space 
Telescope/WFPC2 Images of the GG Tauri Circumbinary Disk" ApJ 
570: 785-792, 2002

KUKULA, M.J.; DUNLOP, J.S.; MCLURE, R.J. "Black-Hole Mass and 
the Formation of Radio Jets in Quasars" Mass Outflow in AGN 
245-250, 2002

KUKULA, M.J.; DUNLOP, J.S.; MCLURE, R.J.; BAUM, S.A.; O'DEA, 
C.P.; HUGHES, D.H. "HST Imaging of Radio Galaxies at z=0.2: 
a Comparison with Quasar Hosts and Normal Ellipticals" NewAR
46: 171-174, 2002

LA BARBERA, F.; BUSARELLO, G.; MERLUZZI, P.; MASSAROTTI, M.; 
CAPACCIOLI, M. "Optical and Near-Infrared Structural Properties 
of Cluster Galaxies at z ~ 0.3" ApJ 571: 790-808, 2002

LAMERS, H.J.G.L.M.; PANAGIA, N.; SCUDERI, S.; ROMANIELLO, M.; 
SPAANS, M.; DE WIT, W.J.; KIRSHNER, R. "Ongoing Massive Star 
Formation in the Bulge of M51" ApJ 566: 818-832, 2002

LAMY, P.L.; TOTH, I.; JORDA, L.; GROUSSIN, G.; A'HEARN, M.F.; 
WEAVER, H.A. "The Nucleus of Comet 22P/Kopff and Its Inner 
Coma" Icarus 156: 442-455, 2002

LANZETTA, K.M.; YAHATA, N.; PASCARELLE, S.; CHEN, H.-W.; 
FERNANDEZ-SOTO, A. "The Star Formation Rate Intensity 
Distribution Function: Implications for Cosmic Star Formation 
Rate History of the Universe" ApJ 570: 492-501, 2002

LEE, M.G.; KIM, M.; SARAJEDINI, A.; GEISLER, D.; GIEREN, W. 
"Determination of the Distance to M33 Based on Single-Epoch 
I-Band Hubble Space Telescope Observations of Cepheids" ApJ 
565: 959-965, 2002

LI, J.; HARRINGTON, J.P.; BORKOWSKI, K.J. "The Angular 
Expansion and Distance of the Planetary Nebula BD +30 deg. 
3639" AJ 123: 2676-2688, 2002

LI, W.; FILIPPENKO, A.V.; VAN DYK, S.D.; HU, J.; QIU, Y.; 
MODJAZ, M.; LEONARD, D.C. "A Hubble Space Telescope Snapshot 
Survey of Nearby Supernovae" PASP 114: 403-415, 2002

MAIZ-APELLANIZ, J.; CIEZA, L.; MACKENTY, J.W. "Tip of the 
Red Giant Branch Distances to NGC 4214, UGC 685, and UGC 
5456" AJ 123: 1307-1315, 2002

MARTEL, A.R.; BAUM, S.A.; SPARKS, W.B.; BIRETTA, J.A.; 
VERDOES KLEIJN, G.; TURNER, N.J. "The Nuclear Dust Disks of 
Five Nearby 3CR Elliptical Galaxies" NewAR 46: 187-192, 2002

MARTEL, A.R.; SPARKS, W.B.; ALLEN, M.G.; KOEKEMOER, A.M.; 
BAUM, S.A. "Discovery of a Star Formation Region in Abell 
2052" AJ 123: 1357-1363, 2002

MIGNANI, R.P.; DE LUCA, A.; CARAVEO, P.A.; MIRABEL, I.F. 
"HST Observations Rule Out the Association between Cir X-1 
and SNR G321.9-0.3" A&A 386: 487-491, 2002

MORALES-JUBERIAS, R.; SANCHEZ-LAVEGA, A.; LECACHEUX, J.; 
COLAS, F. "A Comparative Study of Jovian Anticyclone Properties 
from a Six-Year (1994-2000) Survey" Icarus 157: 76-90, 2002

NEUHAUSER, R.; BRANDNER, W.; ALVES, J.; JOERGENS, V.; COMERON, 
F. "HST, VLT, and NTT Imaging Search for Wide Companions to 
Bona-fide and Candidate Brown Dearfs in the Cha 1 Dark Cloud" 
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