J/ApJS/207/10 HST Treasury Program on the ONC (Robberto+, 2013)
The Hubble Space Telescope Treasury Program on the Orion Nebula Cluster.
Robberto M., Soderblom D.R., Bergeron E., Kozhurina-Platais V.,
Makidon R.B., McCullough P.R., McMaster M., Panagia N., Reid I.N.,
Levay Z., Frattare L., Da Rio N., Andersen M., O'Dell C.R., Stassun K.G.,
Simon M., Feigelson E.D., Stauffer J.R., Meyer M., Reggiani M., Krist J.,
Manara C.F., Romaniello M., Hillenbrand L.A., Ricci L., Palla F.,
Najita J.R., Ananna T.T., Scandariato G., Smith K.
<Astrophys. J. Suppl. Ser., 207, 10 (2013)>
=2013ApJS..207...10R 2013ApJS..207...10R
ADC_Keywords: Clusters, open ; Photometry, HST ; Photometry, infrared
Keywords: brown dwarfs - ISM: individual objects (M42) - stars: formation -
stars: low-mass - stars: pre-main sequence
Abstract:
The Hubble Space Telescope (HST) Treasury Program on the Orion Nebula
Cluster (ONC) has used 104 orbits of HST time to image the Great Orion
Nebula region with the Advanced Camera for Surveys (ACS), the
Wide-Field/Planetary Camera 2 (WFPC2), and the Near-Infrared Camera
and Multi-Object Spectrograph (NICMOS) instrument in 11 filters
ranging from the U band to the H band equivalent of HST. The program
has been intended to perform the definitive study of the stellar
component of the ONC at visible wavelengths, addressing key questions
like the cluster initial mass function, age spread, mass accretion,
binarity, and circumstellar disk evolution. The scanning pattern
allowed us to cover a contiguous field of approximately 600 arcmin2
with both ACS and WFPC2, with a typical exposure time of approximately
11 minutes per ACS filter, corresponding to a point source depth
AB(F435W) = 25.8 and AB(F775W) = 25.2 with 0.2 mag of photometric
error. We describe the observations, data reduction, and data
products, including images, source catalogs, and tools for quick look
preview. In particular, we provide ACS photometry for 3399 stars, most
of them detected at multiple epochs; WFPC2 photometry for 1643 stars,
1021 of them detected in the U band; and NICMOS JH photometry for 2116
stars. We summarize the early science results that have been presented
in a number of papers.
Description:
The full fields covered by the HST ACS/WFC and WFPC2 surveys are
shown, respectively, in Figures 2 and 3. Both are approximately
centered at RA=05:35:00 and DEC=-5:26:00 (J2000), approximately 200"
to the SW of the Trapezium asterism and extend over about one-sixth of
a square degree. In particular, the full ACS mosaic covers
627arcmin2, whereas the WFPC2 mosaic covers 570.5arcmin2. With
NICMOS, our survey covered only a fraction of the ACS field due to the
limited field of view of the instrument (Figure 4). A total of 102
regions were covered in both the filter F110W and F160W bands,
corresponding to about 177arcmin2 and 171.5arcmin2 in the F110W
and F160W filters, respectively.
In order to exchange the relative position of ACS and WFPC2, we
rotated by 180° the roll angle of the HST by scheduling the
observations in two epochs separated by approximately 6 months. The
first epoch, executed in the fall of 2004 (2004 October 11-November
7), covered strips 2, 5, and 6 with a position angle of 280°, for
a total of 36 orbits. The second epoch, executed in the spring of 2005
(2005 March 3-April 26) covered strips 0, 1, 3, 4, 7, and 8 with a
position angle of 100°, for a total of 68 orbits. Both epochs and
position angles were optimized to schedule the observations at the
peaks of the visibility periods of the Orion Nebula. Table 2
summarizes the scheduling of our observations. Figure 6 presents the
overall coverage of the survey.
See section 2 for further explanations about the observations.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 89 104 Observations log
table5.dat 670 8185 ACS source catalog
table6.dat 330 1643 WFPC2 source catalog
table7.dat 78 2116 NICMOS source catalog
--------------------------------------------------------------------------------
See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/A+A/534/A10 : HST/NICMOS III imaging in ONC (Andersen+, 2011)
J/ApJ/733/50 : MIR monitoring of the ONC (Morales-Calderon+, 2011)
J/A+A/533/A38 : Extinction map of OMC-1 (Scandariato+, 2011)
J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)
J/A+A/515/A13 : Very low mass objects in ONC (Rodriguez-Ledesma+, 2010)
J/AJ/139/950 : JHKs photometry in ONC (Robberto+, 2010)
J/ApJS/183/261 : Optical photometry of the ONC (Da Rio+, 2009)
J/AJ/136/2136 : HST/ACS Atlas of Great Orion Nebula proplyds (Ricci+, 2008)
J/ApJ/677/401 : Xray properties of protostars in ONC (Prisinzano+, 2008)
J/ApJS/160/353 : Membership of the Orion nebula population (Getman+, 2005)
J/MNRAS/361/211 : JHK photometry of brown dwarfs in Orion (Lucas+, 2005)
J/A+A/396/513 : Stellar Rotation in the Orion Nebula Cluster (Herbst+, 2002)
J/ApJ/573/366 : Infrared photometry of Trapezium cluster (Muench+, 2002)
J/ApJ/540/236 : KH photometry of Orion Nebula Cluster (Hillenbrand+, 2000)
J/ApJ/540/1016 : K + NICMOS photometry of Trapezium Cluster (Luhman+, 2000)
J/AJ/117/2941 : Rotation periods of Orion PMS stars (Stassun+, 1999)
J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)
J/AJ/111/846 : Orion HST survey (O'Dell+, 1996)
http://archive.stsci.edu/prepds/orion/ : HST Treasury Program on the ONC page
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "YYYY/MMM/DD" Date Observation date
13- 15 I3 deg Orient [100/287] Image orientation (E-W=100 or 280)
17- 18 A2 --- Vis [0-9A-F] Visit (orbit) identification (hexa)
20- 21 I2 h RAh [5] ACS hour of right ascension (J2000)
23- 24 I2 min RAm [34/35] ACS minute of R.A. (J2000)
26- 30 F5.2 s RAs ACS second of right ascension (J2000)
32 A1 --- DE- ACS declination sign (J2000)
33- 34 I2 deg DEd [5] ACS degree of declination (J2000)
36- 37 I2 arcmin DEm [13/39] ACS arcminute of declination (J2000)
39- 43 F5.2 arcsec DEs ACDS arcsecond of declination (J2000)
45- 46 I2 h RAWh [5] WFPC2 hour of right ascension (J2000)
48- 49 I2 min RAWm [34/35] WFPC2 minute of R.A. (J2000)
51- 55 F5.2 s RAWs WFPC2 second of right ascension (J2000)
57 A1 --- DEW- WFPC2 declination sign (J2000)
58- 59 I2 deg DEWd [5] WFPC2 degree of declination (J2000)
61- 62 I2 arcmin DEWm [15/40] WFPC2 arcminute of DEC (J2000)
64- 67 F4.1 arcsec DEWs WFPC2 arcsecond of declination (J2000)
69 I1 h RANh [5]? NICMOS-3 hour of right ascension (J2000)
71- 72 I2 min RANm [34/35]? NICMOS-3 minute of R.A. (J2000)
74- 78 F5.2 s RANs ? NICMOS-3 second of right ascension (J2000)
80 A1 --- DEN- NICMOS-3 declination sign (J2000)
81 I1 deg DENd [5]? NICMOS-3 degree of declination (J2000)
83- 84 I2 arcmin DENm [11/44]? NICMOS-3 arcminute of DEC (J2000)
86- 89 F4.1 arcsec DENs ? NICMOS-3 arcsecond of declination (J2000)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/8185] Sequential entry number (1)
6- 9 I4 --- ONCacs [1/8185] First (Main) entry number
(3399 unique numbers) (2)
11- 12 I2 h RAh [5] Hour of Right Ascension (J2000)
14- 15 I2 min RAm [34/35] Minute of Right Ascension (J2000)
17- 22 F6.3 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [-] Sign of the Declination (J2000)
25- 26 I2 deg DEd [5] Degree of Declination (J2000)
28- 29 I2 arcmin DEm [12/41] Arcminute of Declination (J2000)
31- 35 F5.2 arcsec DEs Arcsecond of Declination (J2000)
37- 38 A2 --- Vis [0-9A-F] HST Visit
40 I1 --- CCD [1/4] ACS CCD chip
42- 49 F8.2 pix x435 X pixel position in F435W image
51- 58 F8.2 pix x555 [-1/4102] X pixel position in F555W image
60- 67 F8.2 pix x658 X pixel position in F658N image
69- 76 F8.2 pix x775 X pixel position in F775W image
78- 85 F8.2 pix x850 X pixel position in F850LP image
87- 94 F8.2 pix y435 Y pixel position in F435W image
96-103 F8.2 pix y555 Y pixel position in F555W image
105-112 F8.2 pix y658 Y pixel position in F658N image
114-121 F8.2 pix y775 Y pixel position in F775W image
123-130 F8.2 pix y850 Y pixel position in F850LP image
132-138 F7.4 mag F435W ?=99.9999 HST/ACS F435W Vega magnitude
140-146 F7.4 mag e_F435W [0.0006/27]?=99.9999 F435W uncertainty
148 I1 --- f_F435W [0/4] Flag on F435W, 1=good (3)
150-156 F7.4 mag F555W ?=99.9999 HST/ACS F555W Vega magnitude
158-164 F7.4 mag e_F555W ?=99.9999 Uncertainty in F555W
166 I1 --- f_F555W [0/4] Flag on F555W, 1=good (3)
168-174 F7.4 mag F658N ?=99.9999 HST/ACS F658N Vega magnitude
176-182 F7.4 mag e_F658N ?=99.9999 Uncertainty in F658N
184 I1 --- f_F658N [0/4] Flag on F658N, 1=good (3)
186-192 F7.4 mag F775W ?=99.9999 HST/ACS F775W Vega magnitude
194-200 F7.4 mag e_F775W ?=99.9999 Uncertainty in F775W
202 I1 --- f_F775W [0/4] Flag on F775W, 1=good (3)
204-210 F7.4 mag F850LP ?=99.9999 HST/ACS F850LP Vega magnitude
212-218 F7.4 mag e_F850LP ?=99.9999 Uncertainty in F850LP
220 I1 --- f_F850LP [0/4]? Flag on F850LP, 1=good (3)
222-223 I2 pix rad435 [2/10] Extraction radius in F435W image
225-226 I2 pix rad555 [2/10] Extraction radius in F555W image
228-229 I2 pix rad658 [2/10] Extraction radius in F658N image
231-232 I2 pix rad775 [2/10] Extraction radius in F775W image
234-235 I2 pix rad850 [2/10] Extraction radius in F850LP image
236-244 F9.2 ct csky435 Sky counts in F435W image
245-253 F9.2 ct csky555 Sky counts in F555W image
255-262 F8.2 ct csky658 Sky counts in F658N image
263-271 F9.2 ct csky775 Sky counts in F775W image
272-280 F9.2 ct csky850 Sky counts in F850LP image
282-289 F8.2 ct e_csky435 Sigma sky counts in F435W image
291-298 F8.2 ct e_csky555 [-1/7987] Sigma sky counts in F555W image
300-307 F8.2 ct e_csky658 Sigma sky counts in F658N image
309-316 F8.2 ct e_csky775 Sigma sky counts in F775W image
318-325 F8.2 ct e_csky850 Sigma sky counts in F850LP image
327-328 I2 pix isky435 [5/20] Sky annulus inner radius in F435W
330-331 I2 pix isky555 [5/20] Sky annulus inner radius in F555W
333-334 I2 pix isky658 [5/20] Sky annulus inner radius in F658N
336-337 I2 pix isky775 [5/20] Sky annulus inner radius in F775W
339-340 I2 pix isky850 [5/20] Sky annulus inner radius in F850LP
342-343 I2 pix osky435 [8/30] Sky annulus outer radius in F435W
345-346 I2 pix osky555 [8/30] Sky annulus outer radius in F555W
348-349 I2 pix osky658 [8/30] Sky annulus outer radius in F658N
351-352 I2 pix osky775 [8/30] Sky annulus outer radius in F775W
354-355 I2 pix osky850 [8/30] Sky annulus outer radius in F850LP
356-364 F9.2 ct max435 Peak counts in F435W image
365-373 F9.2 ct max555 [72/124373] Peak counts in F435W image
374-382 F9.2 ct max658 Peak counts in F435W image
383-391 F9.2 ct max775 Peak counts in F435W image
392-400 F9.2 ct max850 Peak counts in F850LP image
402-405 I4 pix spx435 [0/317] Number of saturated pixels in F435W
407-410 I4 pix spx555 [0/318] Number of saturated pixels in F555W
412-415 I4 pix spx658 [0/317] Number of saturated pixels in F658N
417-420 I4 pix spx775 [0/317] Number of saturated pixels in F775W
422-425 I4 pix spx850 [0/317] Number of saturated pixels in F850LP
427-428 I2 pix rspx435 [0/10] dmax saturated pixel in F435W (5)
430-431 I2 pix rspx555 [0/10] dmax saturated pixel in F555W (5)
433-434 I2 pix rspx658 [0/10] dmax saturated pixel in F658N (5)
436-437 I2 pix rspx775 [0/10] dmax saturated pixel in F775W (5)
439-440 I2 pix rspx850 [0/10] dmax saturated pixel in F850LP (5)
442 I1 --- type [0/8] Type of source (from quick look) (4)
444-445 A2 --- strip Drizzled strip ([0-8][L/R]; xx if none)
447-455 F9.3 pix xstrip ?=0 X position in drizzled strip
457-465 F9.3 pix ystrip ?=0 Y position in drizzled strip
467-473 F7.4 mag F435Ws ?=99.9999 Vega mag. in F435W drizzled strip
475-481 F7.4 mag F555Ws ?=99.9999 Vega mag. in F555W drizzled strip
483-489 F7.4 mag F658Ns ?=99.9999 Vega mag. in F558N drizzled strip
491-497 F7.4 mag F775Ws ?=99.9999 Vega mag. in F775W drizzled strip
499-505 F7.4 mag F850LPs ?=99.9999 Vega mag. in F850LP drizzled strip
507-513 F7.4 mag e_F435Ws ?=0 Uncertainty in F435Ws
515-521 F7.4 mag e_F555Ws ?=0 Uncertainty in F555Ws
523-529 F7.4 mag e_F658Ns ?=0 Uncertainty in F658Ns
531-537 F7.4 mag e_F775Ws ?=0 Uncertainty in F775Ws
539-545 F7.4 mag e_F850LPs ?=0 Uncertainty in F850LPs
547-548 I2 pix rad435s [2/10]?=0 Extraction radius in F435W
drizzled image
550-551 I2 pix rad555s [2/10]?=0 Extraction radius in F555W
drizzled image
553-554 I2 pix rad658s [2/10]?=0 Extraction radius in F658N
drizzled image
556-557 I2 pix rad775s [2/10]?=0 Extraction radius in F775W
drizzled image
559-560 I2 pix rad850s [2/10]?=0 Extraction radius in F850LP
drizzled image
562-569 F8.2 ct/pix sky435s Sky counts per pixel in F435W drizzled strip
571-578 F8.2 ct/pix sky555s Sky counts per pixel in F555W drizzled strip
580-587 F8.2 ct/pix sky658s Sky counts per pixel in F658N drizzled strip
589-596 F8.2 ct/pix sky775s Sky counts per pixel in F775W drizzled strip
598-605 F8.2 ct/pix sky850s Sky counts per pix. in F850LP drizzled strip
607-614 F8.2 ct/pix e_sky435s Uncertainty on sky435s
616-623 F8.2 ct/pix e_sky555s Uncertainty on sky555s
625-632 F8.2 ct/pix e_sky658s Uncertainty on sky658s
634-641 F8.2 ct/pix e_sky775s Uncertainty on sky775s
643-650 F8.2 ct/pix e_sky850s Uncertainty on sky850s
652-661 A10 "YYYY-MM-DD" Obs.date Date of the observation; GMT
663-670 A8 "h:m:s" Obs.time ? Time of the observation (start); GMT
--------------------------------------------------------------------------------
Note (1): Designation, or sequential entry number; identifies the
observation of a source within a visit (orbit).
Note (2): First entry number. This field facilitates finding sources
observed multiple times. It provides the entry number (onc_acs) of
the first appearance in the catalog. For example, entries onc_acs=100,
101, and 102 are three observations of the same star (in different
visits). They all have onc_acs=100, as this is the first entry number
attributed to this particular source.
Note (3): Flag is:
0 = undetected;
1 = good;
2 = saturated but recovered;
3 = saturated;
4 = from drizzle/coadded image.
Note (4): Source type, from visual inspection as follows:
0 = not measured;
1 = detected in at least one filter and unresolved;
2 = double (companion closer than ∼3 pixels, one entry for both sources);
3 = wide double (companion further than ∼3 pixel, one entry for each source);
5 = silhouette disk;
6 = photoionized (proplyd or with other evidence of photoionization);
7 = galaxy;
8 = Herbig-Haro
Note (5): this column contains the maximum distance of saturated pixels
from the aperture center, usually along a bleeding trail. If this
value reaches 10 pixels, our maximum extraction radius, the star
is considered saturated and is not recovered.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1643] Sequential entry number
6- 9 I4 --- ONCpc2 [1/1643] First (Main) entry number
(1488 unique numbers)
11- 12 I2 h RAh [5] Hour of Right Ascension (J2000)
14- 15 I2 min RAm [34/35] Minute of Right Ascension (J2000)
17- 22 F6.3 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [-] Sign of the Declination (J2000)
25- 26 I2 deg DEd [5] Degree of Declination (J2000)
28- 29 I2 arcmin DEm [14/42] Arcminute of Declination (J2000)
31- 35 F5.2 arcsec DEs Arcsecond of Declination (J2000)
37- 38 A2 --- Vis [0-9A-F] HST Visit (hexa)
39- 40 I2 --- CCD [1/4] WFPC2 CCD chip; 1:PC; 2,3,4: WFC
42- 49 F8.2 pix x336 X position in F336W image
51- 58 F8.2 pix x439 X position in F439W image
60- 67 F8.2 pix x656 [50.73/795.99] X position in F656N image
69- 76 F8.2 pix x814 X position in F814W image
78- 85 F8.2 pix y336 Y position in F336W image
87- 94 F8.2 pix y439 Y position in F439W image
96-103 F8.2 pix y656 [44/798.9] Y position in F656N image
105-112 F8.2 pix y814 Y position in F814W image
114-120 F7.4 mag F336W ?=99.9999 HST/WFPC2 F336W Vega magnitude
122-128 F7.4 mag e_F336W ?=99.9999 Uncertainty in F336W (1)
130 I1 --- f_F336W ? Flag on F336W, 1=OK (2)
132-138 F7.4 mag F439W ?=99.9999 HST/WFPC2 F439W Vega magnitude
140-146 F7.4 mag e_F439W ?=99.9999 Uncertainty in F439W (1)
148 I1 --- f_F439W ? Flag on F439W, 1=OK (2)
150-156 F7.4 mag F656N ?=99.9999 HST/WFPC2 F656N Vega magnitude
158-164 F7.4 mag e_F656N ?=99.9999 Uncertainty in F656N (1)
166 I1 --- f_F656N ? Flag on F656N, 1=OK (2)
168-174 F7.4 mag F814W ?=99.9999 HST/WFPC2 F814W Vega magnitude
176-182 F7.4 mag e_F814W ?=99.9999 Uncertainty in F814W (1)
184 I1 --- f_F814W ? Flag on F814W, 1=OK (2)
186-188 F3.1 arcsec rad336 Extraction radius in F336W image
190-192 F3.1 arcsec rad439 Extraction radius in F439W image
194-196 F3.1 arcsec rad656 [0.1/0.5] Extraction radius in F656N image
198-200 F3.1 arcsec rad814 Extraction radius in F814W image
202-209 F8.2 ct csky336 Sky counts in F336W extraction radius
211-218 F8.2 ct csky439 Sky counts in F439W extraction radius
220-227 F8.2 ct csky656 Sky counts in F656N extraction radius
229-236 F8.2 ct csky814 Sky counts in F814W extraction radius
238-245 F8.2 ct e_csky336 Error on sky counts in F336W image
247-254 F8.2 ct e_csky439 Error on sky counts in F439W image
256-263 F8.2 ct e_csky656 Error on sky counts in F656N image
265-272 F8.2 ct e_csky814 Error on sky counts in F814W image
274-281 F8.2 ct max336 Peak counts in F336W image
283-290 F8.2 ct max439 Peak counts in F439W image
292-299 F8.2 ct max656 Peak counts in F656N image
301-308 F8.2 ct max814 Peak counts in F814W image
311-320 A10 "YYYY-MM-DD" Obs.date Date of the observation; GMT
323-330 A8 "h:m:s" Obs.time Time of the observation; GMT
--------------------------------------------------------------------------------
Note (1): If both magnitude and its uncertainty are 99.999, then the source
could not be measured (e.g. at the edge of the field, negative counts, etc.).
Note (2): Flag as follows:
0 = undetected;
1 = ok;
2 = upper limit in error;
3 = saturated
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ONCnic3 [1/2116] Designation; sequential entry number
7- 8 A2 --- Vis [0-9A-F] HST Visit (hexa)
10- 12 I3 pix xPos [0/787] X pixel position
14- 16 I3 pix yPos [0/679] Y pixel position
18- 19 I2 h RAh [5] Hour of Right Ascension (J2000)
21- 22 I2 min RAm [34/35] Minute of Right Ascension (J2000)
24- 29 F6.3 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- [-] Sign of the Declination (J2000)
32- 33 I2 deg DEd [5] Degree of Declination (J2000)
35- 36 I2 arcmin DEm [11/44] Arcminute of Declination (J2000)
38- 42 F5.2 arcsec DEs Arcsecond of Declination (J2000)
44- 50 F7.4 mag F110W ?=99.9999 HST/NICMOS F110W Vega magnitude
52- 58 F7.4 mag e_F110W ?=99 Uncertainty in F110W
60 I1 --- f_F110W [0/2]? Flag on F110W, 1=OK (1)
62- 68 F7.4 mag F160W ?=99.9999 HST/NICMOS F160W Vega magnitude
70- 76 F7.4 mag e_F160W ?=99 Uncertainty in F160W
78 I1 --- f_F160W [0/2]? Flag on F160W, 1=OK (1)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
0 = not measured;
1 = ok;
2 = undetected, an upper limit is given in uncertainty.
--------------------------------------------------------------------------------
History:
* 08-Aug-2013: from electronic version of the journal
* 22-Oct-2013: new version of table6 from the author, with corrected
positions RA and Dec (the original positions had all decimals of
(arc)seconds set to zero)
* 06-May-2014: new version of table5 from the author, with corrected
positions RA and Dec
* 22-May-2014: new version of table5 from the author
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Aug-2013