Tidal Destruction in a Low-mass Galaxy Environment: The Discovery of Tidal Tails around DDO 44*

Carlin, Jeffrey L.; Garling, Christopher T.; Peter, Annika H. G.; Crnojević, Denija; Forbes, Duncan A.; Hargis, Jonathan R.; Mutlu-Pakdil, Burçin; Pucha, Ragadeepika; Romanowsky, Aaron J.; Sand, David J.; Spekkens, Kristine; Strader, Jay; Willman, Beth

doi:10.3847/1538-4357/ab4c32

Cited by 37 publications

(30 citation statements)

References 145 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ΛCDM theory of a hierarchical universe predicts the presence of very lowmass halos interacting with dwarf galaxies in low-density environments (e.g., Guo et al 2011;Sales et al 2013). Some examples of these interactions were recently discovered by the MADCASH Survey (Carlin et al 2016(Carlin et al , 2019. In this context, we propose that an alternative scenario is that a small galactic system interacted with the star-forming companion generating the observed blue stream, and that later both of them fell simultaneously towards the NGC 7241.…”

Section: The Origin Of Blue Streams: Insights From Theory Simulations...mentioning

confidence: 80%

Once in a blue stream: Detection of recent star formation in the NGC 7241 stellar stream with MEGARA

Martínez–Delgado¹,

Roca-Fàbrega²,

Paz³

et al. 2021

Preprint

View full text Add to dashboard Cite

The census of stellar tidal streams around nearby massive galaxies has significantly grown from recent deep imaging of the low-surface brightness sky. In this work we study the striking case of a blue narrow stream with a possible globular clusterlike progenitor around the Milky Way-size galaxy NGC 7241 and its foreground dwarf companion. We present a follow-up spectroscopic study of this stream based on data taken with the MEGARA instrument at the 10.4-m Gran Telescopio Canarias using the integral field spectroscopy mode. Although our data suggest that this compact object in the stream is actually a foreground Milky Way halo star, we detect emission lines overlapping a less compact, bluer and fainter blob of the stream that is clearly visible in both ultra-violet and optical deep images. From its heliocentric systemic radial velocity derived from the [O ]𝜆5007Å lines (𝑉 syst = 1548.58±1.80 km s −1 ) and new UV and optical broad-band photometry, we conclude that this over-density could be the actual core of the stream, with an absolute magnitude of M𝑔 ∼ -10 and a 𝑔 − 𝑟 = 0.08 ± 0.11, consistent with a remnant of a low-mass dwarf satellite undergoing a current episode of star formation. From the width of the stream and assuming a circular orbit, we calculate that the progenitor mass is between 6.4 × 10 6 M − 2.7 × 10 7 M , which is typical of a dwarf galaxy, but its mass could be substantially lower if the stream is on a very radial orbit. These estimates also suggest that this is one of the lowest mass streams detected so far beyond the Local Group. We find that blue stellar streams containing star formation regions are commonly predicted by high-resolution cosmological simulations of galaxies lighter than the Milky Way. This scenario is consistent with the processes explaining the bursty star formation history of some dwarf satellites, which are followed by a gas depletion and a fast quenching once they enter within the virial radius of their host galaxies for the first time. Thus, it is likely that the stream's progenitor is suffering a star-formation burst comparable to those that have shaped the star-formation history of several Local Group dwarfs in the last few Gigayears.

show abstract

Section: The Origin Of Blue Streams: Insights From Theory Simulations...mentioning

confidence: 80%

Once in a blue stream: Detection of recent star formation in the NGC 7241 stellar stream with MEGARA

Martínez–Delgado¹,

Roca-Fàbrega²,

Paz³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…We evaluate fh ( x) on an 800 2 grid over the full field of view and use kernel bandwidths of 200, 300, 500, and 1000 pc at the assumed distances of our hosts to produce four maps that resemble the RGB maps common in other studies (e.g., Carlin et al 2019). An example of a KDE map with h = 300 pc for NGC 4395 is shown in Figure 2.…”

Section: Dwarf Search Methodsmentioning

confidence: 99%

“…Using these LBT data, Garling et al (2020) showed that the Fornax-analog DDO 113, which ceased forming stars less than 1 Gyr ago (Weisz et al 2011), is undisrupted and was likely quenched due to the cessation of cold gas inflows upon entering the halo of its host, the LMC-analog NGC 4214. Similarly, Carlin et al (2019) showed that DDO 44, a dwarf satellite of similar luminosity that also quenched about a Gyr ago (Karachentsev & Kaisin 2007;Weisz et al 2011), was also tidally disrupted by its ∼ 2×LMC-mass host, NGC 2403. These results are somewhat surprising when compared to the SAGA survey, which focuses on MW-mass hosts and has found predominantly star-forming dwarf satellite galaxies (Geha et al 2017;Mao et al 2020).…”

Section: Introductionmentioning

confidence: 92%

A Search for Satellite Galaxies of Nearby Star-Forming Galaxies with Resolved Stars in LBT-SONG

Garling,

Peter,

Kochanek

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

We present results from a resolved stellar population search for dwarf satellite galaxies of six nearby (D < 5 Mpc), sub-Milky-Way mass hosts using deep (m ∼ 27 mag) optical imaging from the Large Binocular Telescope. We perform image simulations to quantify our detection efficiency for dwarfs over a large range in luminosity and size, and develop a fast catalog-based emulator that includes a treatment of unresolved photometric blending. We discover no new dwarf satellites, but we recover two previously known dwarfs (DDO 113 and LV J1228+4358) with M V < −12 that lie in our survey volume. We preview a new theoretical framework to predict satellite luminosity functions using analytic probability distribution functions and apply it to our sample, finding that we predict one fewer classical dwarf and one more faint dwarf (M V ∼ −7.5) than we find in our observational sample (i.e., the observational sample is slightly top-heavy). However, the overall number of dwarfs in the observational sample ( 2) is in good agreement with the theoretical expectations. Interestingly, DDO 113 shows signs of environmental quenching and LV J1228+4358 is tidally disrupting, suggesting that low-mass hosts may affect their satellites more severely than previously believed.

show abstract

“…It has a satellite galaxy DDO 44 (M 𝑉 = -12.5), and recently a smaller dwarf, called MADCASH-1 (M 𝑉 = -7.7), was discovered by (Carlin et al 2016). Although DDO 44 shows signs of interacting Carlin et al (2019), NGC 2403 itself reveals a remarkably undisturbed HI disk (de Blok et al 2008;Williams et al 2013). This, and its relative isolation, suggests it is a galaxy that has not undergone a strong tidal interaction nor experienced ram pressure stripping.…”

Section: Introductionmentioning

confidence: 99%

Low-Metallicity Globular Clusters in the Low-Mass Isolated Spiral Galaxy NGC 2403

Forbes,

Ferré-Mateu,

Gannon

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

The globular cluster (GC) systems of low-mass late-type galaxies, such as NGC 2403, have been poorly studied to date. As a low mass galaxy (M * = 7 × 10 9 M ), cosmological simulations predict NGC 2403 to contain few, if any, accreted GCs. It is also isolated, with a remarkably undisturbed HI disk. Based on candidates from the literature, Sloan Digital Sky Survey and Hyper Suprime-Cam imaging, we selected several GCs for follow-up spectroscopy using the Keck Cosmic Web Imager. From their radial velocities, and other properties, we identify 8 bona-fide GCs associated with either the inner halo or the disk of this bulgeless galaxy. A stellar population analysis suggests a wide range of GC ages from shortly after the Big Bang until the present day. We find all of the old GCs to be metal-poor with [Fe/H] ≤ -1. The age-metallicity relation for the observed GCs suggests that they were formed over many Gyr from gas with a low effective yield, similar to that observed in the SMC. Outflows of enriched material may have contributed to the low yield. With a total system of ∼50 GCs expected, our study is the first step in fully mapping the star cluster history of NGC 2403 in both space and time.

show abstract

Tidal Destruction in a Low-mass Galaxy Environment: The Discovery of Tidal Tails around DDO 44*

Cited by 37 publications

References 145 publications

Once in a blue stream: Detection of recent star formation in the NGC 7241 stellar stream with MEGARA

Once in a blue stream: Detection of recent star formation in the NGC 7241 stellar stream with MEGARA

A Search for Satellite Galaxies of Nearby Star-Forming Galaxies with Resolved Stars in LBT-SONG

Low-Metallicity Globular Clusters in the Low-Mass Isolated Spiral Galaxy NGC 2403

Contact Info

Product

Resources

About