2018ApJS..235...23S

Query : 2018ApJS..235...23S

2018ApJS..235...23S - Astrophys. J., Suppl. Ser., 235, 23-23 (2018/March-0)

The resolved stellar populations in the LEGUS galaxies1.

SABBI E., CALZETTI D., UBEDA L., ADAMO A., CIGNONI M., THILKER D., ALOISI A., ELMEGREEN B.G., ELMEGREEN D.M., GOULIERMIS D.A., GREBEL E.K., MESSA M., SMITH L.J., TOSI M., DOLPHIN A., ANDREWS J.E., ASHWORTH G., BRIGHT S.N., BROWN T.M., CHANDAR R., CHRISTIAN C., CLAYTON G.C., COOK D.O., DALE D.A., DE MINK S.E., DOBBS C., EVANS A.S., FUMAGALLI M., GALLAGHER J.S., GRASHA K., HERRERO A., HUNTER D.A., JOHNSON K.E., KAHRE L., KENNICUTT R.C., KIM H., KRUMHOLZ M.R., LEE J.C., LENNON D., MARTIN C., NAIR P., NOTA A., OSTLIN G., PELLERIN A., PRIETO J., REGAN M.W., RYON J.E., SACCHI E., SCHAERER D., SCHIMINOVICH D., SHABANI F., VAN DYK S.D., WALTERBOS R., WHITMORE B.C. and WOFFORD A.

Abstract (from CDS):

The Legacy ExtraGalactic UV Survey (LEGUS) is a multiwavelength Cycle 21 Treasury program on the Hubble Space Telescope. It studied 50 nearby star-forming galaxies in 5 bands from the near-UV to the I-band, combining new Wide Field Camera 3 observations with archival Advanced Camera for Surveys data. LEGUS was designed to investigate how star formation occurs and develops on both small and large scales, and how it relates to the galactic environments. In this paper we present the photometric catalogs for all the apparently single stars identified in the 50 LEGUS galaxies. Photometric catalogs and mosaicked images for all filters are available for download. We present optical and near-UV color-magnitude diagrams for all the galaxies. For each galaxy we derived the distance from the tip of the red giant branch. We then used the NUV color-magnitude diagrams to identify stars more massive than 14 M☉, and compared their number with the number of massive stars expected from the GALEX FUV luminosity. Our analysis shows that the fraction of massive stars forming in star clusters and stellar associations is about constant with the star formation rate. This lack of a relation suggests that the timescale for evaporation of unbound structures is comparable or longer than 10 Myr. At low star formation rates this translates to an excess of mass in clustered environments as compared to model predictions of cluster evolution, suggesting that a significant fraction of stars form in unbound systems.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: star clusters: general - galaxies: star formation - galaxies: stellar content - Hertzsprung-Russell and C-M diagrams - stars: formation

VizieR on-line data: <Available at CDS (J/ApJS/235/23): table1.dat table4.dat catlegus.dat phot/*>

Nomenclature: LEGUS JHHMMSS.ss+DDMMSS.s N=39127740.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 45 Sy2 00 14 04.0072128696 -23 10 55.132646808 11.92 11.21 10.73 10.58 10.4 ~ 269 1
2 Z 458-20 AG? 01 07 23.0321 +16 41 00.988 15.01 14.55 14.07     ~ 148 0
3 Z 385-2 LSB 01 07 46.4168514120 +01 03 49.112609292 15.73 15.26 14.84 14.67 15.6 ~ 59 0
4 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1
5 IC 1727 GiP 01 47 29.890 +27 20 00.06   12.54 11.98 11.77   ~ 216 0
6 NGC 1269 EmG 03 17 18.5785534752 -41 06 28.628735184 9.85 9.83 8.81 8.72   ~ 445 1
7 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 723 2
8 NGC 1433 Sy2 03 42 01.4847418992 -47 13 18.929092656   10.84 9.99 9.61 10.2 ~ 447 0
9 NGC 1510 GiP 04 03 32.640 -43 24 00.58 14.23 13.63 13.24 13.09   ~ 201 1
10 NGC 1512 GiP 04 03 54.281 -43 20 55.86 11.30 11.43 10.54 10.37   ~ 457 1
11 NGC 1566 Sy1 04 20 00.3968473248 -54 56 16.624708764 10.29 10.19 9.73 9.21 10.1 ~ 1051 2
12 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
13 MCG-04-12-041 AG? 05 03 19.69 -25 25 22.5 14.89 14.41 14.03 13.87 14.0 ~ 65 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
15 NGC 2500 GiG 08 01 53.1717201720 +50 44 13.602483780 11.98 12.20 11.62 11.34 10.85 ~ 215 2
16 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
17 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
18 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
19 IC 559 AG? 09 44 43.816 +09 36 57.37   15.0       ~ 61 0
20 Z 153-5 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55 26.509 ~ 252 1
21 NGC 3274 EmG 10 32 17.2253817864 +27 40 07.165226244   13.30   12.77   ~ 261 0
22 NGC 3344 EmG 10 43 31.150 +24 55 19.99 10.38 10.54 9.86 9.71   ~ 434 1
23 M 95 GiP 10 43 57.7313485800 +11 42 13.301191332 10.71 10.51 9.73 9.48   ~ 1238 2
24 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 862 1
25 M 66 AGN 11 20 15.0 +12 59 29 9.85 9.65 8.92     ~ 1509 4
26 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
27 Z 315-26 AG? 12 14 08.40 +66 05 41.0   14.60       ~ 89 1
28 NGC 4242 GiG 12 17 30.1835103480 +45 37 09.508940220   11.37 10.83     ~ 285 1
29 NGC 4248 GiG 12 17 49.8429850848 +47 24 33.085192824   13.12 12.53     ~ 129 1
30 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
31 Z 244-7 GiG 12 21 15.01 +45 48 40.8   14.8       ~ 123 2
32 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
33 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
34 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
35 NGC 4485 GiP 12 30 31.113 +41 42 04.22 12.10 12.42 11.93 11.93   ~ 305 2
36 NGC 4490 GiG 12 30 34.5 +41 38 26 10.03 10.22 9.79     ~ 616 3
37 NGC 4605 GiG 12 39 59.2837284936 +61 36 32.822365392   10.94   10.35   ~ 347 2
38 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
39 NGC 4656 GiP 12 43 57.6889089768 +32 10 13.345914504   10.96 10.52     ~ 385 3
40 IC 4247 EmG 13 26 44.43 -30 21 44.7 15.34 14.67 14.28 14.13 14.53 ~ 99 0
41 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
42 NGC 5195 GiG 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 816 3
43 NGC 5238 GiP 13 34 42.5146948080 +51 36 49.168365696   14.2       ~ 143 0
44 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
45 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
46 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 475 1
47 NGC 5477 AG? 14 05 33.318 +54 27 37.85 13.94 14.36 14.01     ~ 224 1
48 NGC 5949 AG? 15 28 00.6695692032 +64 45 47.413223532   12.70       ~ 152 0
49 NGC 6503 LIN 17 49 26.4207792072 +70 08 39.604132176 11.56 10.95 10.28 9.92   ~ 551 1
50 NGC 6744 GiG 19 09 46.1335950504 -63 51 26.897079024   9.28 8.25 8.08 9.6 ~ 303 0
51 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2

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