J/MNRAS/450/3811 M33 GALEX catalogue of UV point sources (Mudd+, 2015)
GALEX catalogue of UV point sources in M33.
Mudd D., Stanek K.Z.
<Mon. Not. R. Astron. Soc., 450, 3811-3821 (2015)>
=2015MNRAS.450.3811M 2015MNRAS.450.3811M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Photometry, ultraviolet ; Photometry, UBVRI
Keywords: catalogues - Local Group - ultraviolet: stars
Abstract:
The hottest stars (>10000K), and by extension typically the most
massive ones, are those that will be prevalent in the ultraviolet (UV)
portion of the electromagnetic spectrum, and we expect to numerous B,
O and WR (WR) stars to be bright in UV data. In this paper, we update
the previous point source UV catalogue of M33, created using the
Ultraviolet Imaging Telescope (UIT), using data from the Galaxy
Evolution Explorer (GALEX). We utilize point spread function
photometry to optimally photometer sources in the crowded regions of
the galaxy, and benefit from GALEX's increased sensitivity compared to
UIT. We match our detections with data from the Local Group Galaxies
Survey to create a catalogue with photometry spanning from the far-UV
through the optical for a final list of 24738 sources. All of these
sources have far-UV (FUV; 1516Å), near-UV (NUV; 2267Å) and V
data, and a significant fraction also have U, B, R and I data as well.
We also present an additional 3000 sources that have no matching
optical counterpart. We compare all of our sources to a catalogue of
known WR stars in M33 and find that we recover 114 of 206 stars with
spatially-coincident UV point sources. Additionally, we highlight and
investigate those sources with unique colours as well as a selection
of other well-studied sources in M33.
Description:
This catalogue was made using the Ultraviolet Imaging Telescope (UIT),
an instrument aboard the Astro-1 Mission. UIT used photographic plates
with the B1 and A1 filters roughly corresponding to the FUV and NUV
filters of GALEX, having central wavelengths of ∼1500 and 2400Å,
respectively. It should be noted, however, that the A1 filter is
significantly broader than the NUV filter on GALEX, reaching several
hundred angstroms to the red end of its GALEX counterpart. The field
of view of UIT is also circular but has a smaller radius of 18 arcmin
The FWHM of UIT is comparable to that of GALEX, at 4 and 5.2 arcsec in
the NUV and FUV filters, respectively.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 92 356 UIT sources that were recovered using GALEX data
table2.dat 155 24738 Our UV sources that had optical counterparts
from the LGGS (Massey et al, 2006, J/AJ/131/2478)
table3.dat 51 3163 Those UV sources that did not have an
optical counterpart
--------------------------------------------------------------------------------
See also:
J/AJ/131/2478 : M31 and M33 UBVRI photometry, LGGS (Massey+, 2006)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- UIT [2/374] UIT identification number
5- 12 F8.5 deg RAdeg UIT right ascension (J2000)
14- 21 F8.5 deg DEdeg UIT declination (J2000)
23- 30 F8.5 deg RAGdeg ?=- GALEX right ascension (J2000)
32- 39 F8.5 deg DEGdeg ?=- GALEX declination (J2000)
41- 45 F5.2 mag FUV UIT FUV magnitude (AB)
47- 51 F5.2 mag NUV UIT NUV magnitude (AB)
53- 57 F5.2 mag FUVG ?=- GALEX FUV magnitude (AB)
59- 62 F4.2 mag e_FUVG ?=- rms uncertainty on GALEX FUV magnitude
64- 68 F5.2 mag NUVG ?=- GALEX NUV magnitude (AB)
70- 73 F4.2 mag e_NUVG ?=- rms uncertainty on GALEX NUV magnitude
75- 79 F5.2 mag FUV-FUVG ?=- UIT-GALEX FUV magnitude
81- 85 F5.2 mag NUV-NUVG ?=- UIT-GALEX NUV magnitude
87- 90 F4.2 arcsec Sep ?=- Separation between IUT and GALEX sources
92 I1 --- Match ?=- Number of GALEX objects we find that are
within 5 arcsec and compatible with the
given UIT source
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Name Name (JHHMMSS.ss+DDMMSS.s)
21- 28 F8.5 deg RAdeg UV right ascension (J2000)
30- 37 F8.5 deg DEdeg UV declination (J2000)
39- 46 F8.5 deg RAOdeg Optical right ascension (J2000)
48- 55 F8.5 deg DEOdeg Optical declination (J2000)
57- 62 F6.3 mag FUV FUV magnitude (AB)
64- 68 F5.3 mag e_FUV rms uncertainty on FUV magnitude (AB)
70- 75 F6.3 mag NUV NUV magnitude (AB)
77- 81 F5.3 mag e_NUV rms uncertainty on NUV magnitude (AB)
83- 88 F6.3 mag Umag ?=99.999 LGGS U magnitude
90- 94 F5.3 mag e_Umag ?=9.999 rms uncertainty on U magnitude (AB)
96-101 F6.3 mag Bmag LGGS B magnitude
103-107 F5.3 mag e_Bmag rms uncertainty on B magnitude (AB)
109-114 F6.3 mag Vmag LGGS V magnitude
116-120 F5.3 mag e_Vmag rms uncertainty on V magnitude (AB)
122-127 F6.3 mag Rmag LGGS R magnitude
129-133 F5.3 mag e_Rmag rms uncertainty on R magnitude (AB)
135-140 F6.3 mag Imag ?=99.999 LGGS I magnitude
142-146 F5.3 mag e_Imag ?=9.999 rms uncertainty on I magnitude (AB)
148-152 F5.3 arcsec Sep ?=- Absolute separation between UV and optical
catalog sources
154-155 I2 --- Match ?=- Number of optical objects we find that are
within 3.2 arcsec of the GALEX source
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [6/40900] Identification number
7- 14 F8.5 deg RAdeg UV right ascension (J2000)
16- 23 F8.5 deg DEdeg UV declination (J2000)
25- 30 F6.3 mag FUV ?=- FUV magnitude (AB)
32- 36 F5.3 mag e_FUV ?=- rms uncertainty on FUV magnitude
38- 43 F6.3 mag NUV ?=- NUV magnitude (AB)
45- 49 F5.3 mag e_NUV ?=- rms uncertainty on NUV magnitude
51 I1 --- Nmat ?=- Number of NUV sources within 3.2 arcsec
of the FUV source
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Dec-2015