2021ApJ...915...57G

Query : 2021ApJ...915...57G

2021ApJ...915...57G - Astrophys. J., 915, 57-57 (2021/July-1)

A deep census of outlying star formation in the M101 Group.

GARNER III R., MIHOS J.C., HARDING P. and WATKINS A.E.

Abstract (from CDS):

We present deep, narrowband imaging of the nearby spiral galaxy M101 and its group environment to search for star-forming dwarf galaxies and outlying H II regions. Using the Burrell Schmidt telescope, we target the brightest emission lines of star-forming regions, Hα, Hβ, and [O III], to detect potential outlying star-forming regions. Our survey covers ∼6 deg2 around M101, and we detect objects in emission down to an Hα flux level of 5.7 x 10–17 erg s–1 cm–2 (equivalent to a limiting star formation rate of 1.7 x 10–6 M☉ yr–1 at the distance of M101). After careful removal of background contaminants and foreground M stars, we detect 19 objects in emission in all three bands and 8 objects in emission in Hα and [O III]. We compare the structural and photometric properties of the detected sources to Local Group dwarf galaxies and star-forming galaxies in the 11HUGS and SINGG surveys. We find no large population of outlying H II regions or undiscovered star-forming dwarfs in the M101 Group, as most sources (93%) are consistent with being M101 outer-disk H II regions. Only two sources were associated with other galaxies: a faint star-forming satellite of the background galaxy NGC 5486 and a faint outlying H II region near the M101 companion NGC 5474. We also find no narrowband emission associated with recently discovered ultradiffuse galaxies and starless H I clouds near M101. The lack of any hidden population of low-luminosity star-forming dwarfs around M101 suggests a rather shallow faint-end slope (as flat as α ∼ -1.0) for the star-forming luminosity function in the M101 Group. We discuss our results in the context of tidally triggered star formation models and the interaction history of the M101 Group.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Narrow band photometry - Galaxy environments - Star formation - Star-forming regions

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 25

goto Full paper

goto View the references in ADS

Number of rows : 25
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
3 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
4 UGCA 92 AG? 04 32 03.8366 +63 36 51.243   16.15       ~ 128 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 891 1
7 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
8 Z 272-13 AG? 13 54 45.602 +53 54 20.06   14.2       ~ 219 0
9 [BSC2017] Dw 9 LSB 13 55 44.6 +55 08 45           ~ 11 0
10 Z 272-15 GiG 13 59 53.481 +54 47 18.18   15.3       ~ 11 0
11 NAME M101 Group GrG 14 03 +54.3           ~ 112 1
12 [MVA2014] DF 3 LSB 14 03 05.7 +53 36 56   17.9       ~ 21 0
13 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
14 SMDG J1403450+535638 LSB 14 03 45.0 +53 56 40   18.9       ~ 21 0
15 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 250 1
16 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 475 1
17 NGC 5477 AG? 14 05 33.318 +54 27 37.85 13.94 14.36 14.01     ~ 224 1
18 SMDG J1406499+534430 LSB 14 06 49.9 +53 44 30   19.2       ~ 17 0
19 NGC 5486 LSB 14 07 25.027 +55 06 10.52   14.0       ~ 106 1
20 SMDG J1408374+541932 LSB 14 08 37.5 +54 19 31   19.8       ~ 20 0
21 Z 272-36 LSB 14 09 09.789 +53 49 16.69   15.4       ~ 18 0
22 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
23 NGC 7317 Sy2 22 35 51.8681746944 +33 56 41.758033380 15.10 14.57 13.60 12.72   ~ 182 1
24 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 480 1
25 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2021ApJ...915...57G and select 'bookmark this link' or equivalent in the popup menu