J/AJ/148/124 Herschel key program Heritage (Seale+, 2014)
Herschel key program Heritage:
a far-infrared source catalog for the Magellanic Clouds.
Seale J.P., Meixner M., Sewilo M., Babler B., Engelbracht C.W., Gordon K.,
Hony S., Misselt K., Montiel E., Okumura K., Panuzzo P., Roman-Duval J.,
Sauvage M., Boyer M.L., Chen C.-H.R., Indebetouw R., Matsuura M.,
Oliveira J.M., Srinivasan S., van Loon J.T., Whitney B., Woods P.M.
<Astron. J., 148, 124 (2014)>
=2014AJ....148..124S 2014AJ....148..124S
ADC_Keywords: Surveys ; Galaxies, IR ; Magellanic Clouds ; Photometry, infrared
Mission_Name: Herschel
Keywords: circumstellar matter; galaxies: dwarf; infrared: stars
Magellanic Clouds; stars: formation; stars: pre-main sequence
Abstract:
Observations from the HERschel Inventory of the Agents of Galaxy
Evolution (HERITAGE) have been used to identify dusty populations of
sources in the Large and Small Magellanic Clouds (LMC and SMC). We
conducted the study using the HERITAGE catalogs of point sources
available from the Herschel Science Center from both the Photodetector
Array Camera and Spectrometer (PACS; 100 and 160µm) and Spectral
and Photometric Imaging Receiver (SPIRE; 250, 350, and 500µm)
cameras. These catalogs are matched to each other to create a Herschel
band-merged catalog and then further matched to archival Spitzer IRAC
and MIPS catalogs from the Spitzer Surveying the Agents of Galaxy
Evolution (SAGE) and SAGE-SMC surveys to create single mid- to
far-infrared (far-IR) point source catalogs that span the wavelength
range from 3.6 to 500µm. There are 35,322 unique sources in the
LMC and 7503 in the SMC. To be bright in the FIR, a source must be
very dusty, and so the sources in the HERITAGE catalogs represent the
dustiest populations of sources. The brightest HERITAGE sources are
dominated by young stellar objects (YSOs), and the dimmest by
background galaxies. We identify the sources most likely to be
background galaxies by first considering their morphology (distant
galaxies are point-like at the resolution of Herschel) and then
comparing the flux distribution to that of the Herschel Astrophysical
Terahertz Large Area Survey (ATLAS) survey of galaxies. We find a
total of 9745 background galaxy candidates in the LMC HERITAGE images
and 5111 in the SMC images, in agreement with the number predicted by
extrapolating from the ATLAS flux distribution. The majority of the
Magellanic Cloud-residing sources are either very young, embedded
forming stars or dusty clumps of the interstellar medium. Using the
presence of 24µm emission as a tracer of star formation, we
identify 3518 YSO candidates in the LMC and 663 in the SMC. There are
far fewer far-IR bright YSOs in the SMC than the LMC due to both the
SMC's smaller size and its lower dust content. The YSO candidate lists
may be contaminated at low flux levels by background galaxies, and so
we differentiate between sources with a high ("probable") and moderate
("possible") likelihood of being a YSO. There are 2493/425 probable
YSO candidates in the LMC/SMC. Approximately 73% of the Herschel YSO
candidates are newly identified in the LMC, and 35% in the SMC. We
further identify a small population of dusty objects in the late
stages of stellar evolution including extreme and post-asymptotic
giant branch, planetary nebulae, and supernova remnants. These
populations are identified by matching the HERITAGE catalogs to lists
of previously identified objects in the literature. Approximately half
of the LMC sources and one quarter of the SMC sources are too faint to
obtain accurate ample FIR photometry and are unclassified.
Description:
Band-merged point source catalogue containing photometric information
for 35,322 unique sources in the Large Magellanic Cloud (LMC) and 7503
in the Small Magellanic Cloud (SMC) spanning the wavelength range from
3.6 to 500 microns. The photometric data is the result of combining
data obtained with PACS/Herschel and SPIRE/Herschel under the HERITAGE
(HERschel Inventory of the Agents of Galaxy Evolution) Key Program,
and with IRAC/Spitzer and MIPS/Spitzer under the SAGE (Surveying the
Agents of Galaxy Evolution) Spitzer survey. A tentative classification
of the sources detected are also provided in two dedicated tables,
together with an estimation of the far-infrared luminosity and dust
temperature for every source.
All images and catalogs are available at:
Herschel Science Archive:
http://herschel.esac.esa.int/Science_Archive.shtml
Herschel User Provided Data Products web page:
http://www.cosmos.esa.int/web/herschel/user-provided-data-products
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
lmcclass.dat 193 35322 BMC Classification for LMC
smcclass.dat 193 7503 BMC Classification for SMC
refs.dat 190 21 References
lmcphot.dat 448 35322 Band-Matched catalog for LMC
smcphot.dat 448 7503 Band-Matched catalog for SMC
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See also:
II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)
J/AJ/146/62 : HERschel HERITAGE in Magellanic Clouds (Meixner+, 2013)
Byte-by-byte Description of file: *mcclass.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- --- [HSOBMHERICC]
12 A1 --- --- [_]
13- 32 A20 --- Name The identifying name of the source,
JDD.ddddd+DD.ddddd
34- 42 F9.6 deg RAdeg Right Ascension (J2000)
44- 53 F10.6 deg DEdeg Declination (J2000)
55 I1 --- ProbYSO [0/1] HERITAGE probable YSO candidates,
1 for yes, 0 for no
57 I1 --- PosYSO [0/1] HERITAGE possible YSO candidates,
1 for yes, 0 for no
59 I1 --- ProbDust [0/1] HERITAGE probable YSO candidates,
1 for yes, 0 for no
61 I1 --- PosDust [0/1] HERITAGE possible YSO candidates,
1 for yes, 0 for no
63 I1 --- HERGalaxy [0/1] HERITAGE background galaxy candidates,
1 for yes, 0 for no
65- 98 A34 --- LitClass ? Classification(s) of positionally matched
literature source (1)
100-132 A33 --- LitRef Reference(s) for positionally matched
literature source (1)
134-166 A33 arcsec LitDist Distance(s) between BMC source and
literature source (1)
168-174 I7 Lsun LFIR ?=-999 Graybody-fit far-IR luminosity
176-182 I7 Lsun e_LFIR ?=-999 Uncertainty of graybody-fit far-IR
luminosity.
184-188 F5.1 K TFIR ?=0.0 Graybody-fit far-IR dust temperature
190-193 F4.1 K e_TFIR ?=0.0 Uncertainty of graybody-fit FIR dust
temperature
--------------------------------------------------------------------------------
Note (1): separated by a '/'. References in refs.dat file.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Ref Reference code
11- 29 A19 --- BibCode BibCode
31- 50 A20 --- Aut Author's name
52-190 A139 --- Com Comments
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Byte-by-byte Description of file: *mcphot.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- --- [HSOBMHERICC]
12 A1 --- --- [_]
13- 32 A20 --- Name The identifying name of the source,
JDD.ddddd+DD.ddddd
34- 42 F9.6 deg RAdeg Right Ascension (J2000)
44- 53 F10.6 deg DEdeg Declination (J2000)
55- 58 I4 --- GroupID ?=-999 Running identification number
specifying group membership
60 A1 --- Dominant [01-] 1 for dominant source, 0 for not
62 A1 --- PointFlag [01-] 1 for point-like, 0 for not
64- 79 A16 --- P100Name P100 source name as given in the
HERITAGE catalogs (Cat. J/AJ/146/62,
lmcp100.dat for LMC, smcp100.dat for SMC)
81- 96 A16 --- P160Name P160 source name as given in the
HERITAGE catalogs (Cat. J/AJ/146/62,
lmcp160.dat for LMC, smcp160.dat for SMC)
98-113 A16 --- S250Name S250 source name as given in the
HERITAGE catalogs (Cat. J/AJ/146/62,
lmcp250.dat for LMC, smcp250.dat for SMC)
115-130 A16 --- S350Name S350 source name as given in the
HERITAGE catalogs (Cat. J/AJ/146/62,
lmcp350.dat for LMC, smcp350.dat for SMC)
132-147 A16 --- S500Name S500 source name as given in the
HERITAGE catalogs (Cat. J/AJ/146/62,
lmcp500.dat for LMC, smcp500.dat for SMC)
149-155 F7.1 mJy F100 ?=0 P100 source flux
157-163 F7.2 mJy e_F100 ?=0 P100 source flux uncertainty
165 A1 --- f_F100 [01234-] P100 source flag
167-173 F7.1 mJy F160 ?=0 P160 source flux
175-181 F7.2 mJy e_F160 ?=0 P160 source flux uncertainty
183 A1 --- f_F160 [01234-] P160 source flag
185-191 F7.1 mJy F250 ?=0 S250 source flux
193-199 F7.2 mJy e_F250 ?=0 S250 source flux uncertainty
201 A1 --- f_F250 [01234-] S250 source flag
203-209 F7.1 mJy F350 ?=0 S350 source flux
211-216 F6.2 mJy e_F350 ?=0 S350 source flux uncertainty
218 A1 --- f_F350 [01234-] S350 source flag
220-225 F6.1 mJy F500 ?=0 S500 source flux
227-232 F6.2 mJy e_F500 ?=0 S500 source flux uncertainty
234 A1 --- f_F500 [01234-] S500 source flag
236-265 A30 --- IRAC SAGE IRAC Designation,
SSTISAGEMA_JHHMMSS.ss+DDMMSS.s
267-296 A30 --- MIPS24 SAGE MIPS 24 micron Designation,
SSTM1SAGE[012]_JHHMMSS.ss+DDMMSS.s
298-328 A31 --- MIPS70 SAGE MIPS 70 micron Designation,
SSTM2SAGEC_JHHMMSS.ss+DDMMSS.s
330-334 F5.2 arcsec SHdist ?=0 Distance between Spitzer 24 micron and
Herschel sources
336-344 F9.3 mJy F3.6 ?=0 3.6 micron source flux
346-354 F9.4 mJy e_F3.6 ?=0 3.6 micron source flux uncertainty
356-364 F9.3 mJy F4.5 ?=0 4.5 micron source flux
366-373 F8.4 mJy e_F4.5 ?=0 4.5 micron source flux uncertainty
375-383 F9.3 mJy F5.8 ?=0 5.8 micron source flux
385-392 F8.4 mJy e_F5.8 ?=0 5.8 micron source flux uncertainty
394-401 F8.3 mJy F8.0 ?=0 8.0 micron source flux
403-410 F8.4 mJy e_F8.0 ?=0 8.0 micron source flux uncertainty
412-420 F9.3 mJy F24 ?=0 24 micron source flux
422-429 F8.4 mJy e_F24 ?=0 24 micron source flux uncertainty
431-439 F9.2 mJy F70 ?=0 70 micron source flux
441-448 F8.3 mJy e_F70 ?=0 70 micron source flux uncertainty
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Acknowledgements:
Miriam Aberasturi Vega, miriam.aberasturi(at)sciops.esa.int
(End) Miriam Aberasturi Vega [Spain], Patricia Vannier [CDS] 20-Feb-2015