The C-Band All-Sky Survey (C-BASS): new constraints on the integrated radio spectrum of M 31

Harper, Stuart E.; Barr, A.; Dickinson, C.; Peel, M.; Cepeda-Arroita, Roke; Copley, Charles; Grumitt, R. D. P.; Leahy, J. P.; Jonas, J. L.; Jones, Michael E.; Leech, J.; Pearson, T. J.; Readhead, A. C. S.; Taylor, Angela C.

doi:10.1093/mnras/stad1539

Cited by 5 publications

(2 citation statements)

References 90 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, more significant evidence supporting the presence of AME in M31 was subsequently confirmed by Battistelli et al (2019). A recent study by Harper et al (2023) reported the marginal detection of AME in M31, suggesting that it may not be uniformly distributed throughout the entire galaxy. Conversely, the study by Fernández-Torreiro et al (2024) presented a contrasting view, strongly advocating for the presence of AME in M31.…”

Section: Introductionmentioning

confidence: 91%

Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations

Poojon,

Chung,

Hoang

et al. 2024

ApJ

View full text Add to dashboard Cite

We present the results of the single-dish observations using the Korean VLBI Network to search for anomalous microwave emission (AME) in nearby galaxies. The targets were selected from ‘Mapping the dense molecular gas in the strongest star-forming galaxies' (MALATANG), a legacy survey project of the James Clerk Maxwell Telescope. The MALATANG galaxies are good representatives of local galaxies with enhanced nuclear activity associated with star formation and/or active galactic nuclei (AGNs), providing IR-bright galaxy samples; thus, they are good candidates for AME hosts. Combining with ancillary data, we investigated the radio–IR spectral energy distribution (SED), while searching for AME signals in five galaxies. The AME in NGC 2903 was well detected at a significant confidence level, whereas that in NGC 2146 and M82 was marginal. NGC 1068 and Arp 299 indicated no significant hints, and we provide upper limits for the AME. The best-fit SED exhibited local peaks of the AME components at higher frequencies and with stronger peak fluxes than those in previous studies. This suggested that AME originates from denser environments such as molecular clouds or photodissociation regions rather than warm neutral/ionized medium as commonly suggested by previous studies. Further, our AME-detected targets were observed to exhibit higher specific star formation rates than the other extragalactic AME hosts. Furthermore, AME favored starburst galaxies among our sample rather than AGN hosts. Consequently, this might imply that AGNs are excessively harsh environments for tiny dust to survive.

show abstract

Section: Introductionmentioning

confidence: 91%

Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations

Poojon,

Chung,

Hoang

et al. 2024

ApJ

View full text Add to dashboard Cite

show abstract

“…Despite numerous radio surveys of M31 and local environs, there is no reported nonthermal emission in the SDSO area southeast of M31ʼs nucleus. In both low-and high-frequency radio and far-infrared surveys of M31, there has been no reported adjacent SNR or any evidence of emission in M31ʼs halo at SDSO's location so close to M31ʼs disk (Graeve et al 1981;Beck & Graeve 1982;Berkhuijsen et al 1983Berkhuijsen et al , 1991Beck et al 1998;Berkhuijsen et al 2003;Planck Collaboration et al 2015;Harper et al 2023). While SDSO's faint optical emission might suggest equally faint radio emission, the lack of any hint of coincident radio emission is a potential difficulty.…”

Section: A Faint Undiscovered Galactic Snrmentioning

confidence: 99%

The Spatial and Emission Properties of the Large [O iii] Emission Nebula Near M31

Fesen,

Kimeswenger,

Shull

et al. 2023

ApJ

View full text Add to dashboard Cite

Drechsler et al. reported the unexpected discovery of a 1.°5 long [O iii] emission nebula 1.°2 southeast of the M31 nucleus. Here we present additional images of this large emission arc, called the Strottner–Drechsler–Sainty Object (SDSO), along with radial velocity and flux measurements from low-dispersion spectra. Independent sets of [O iii] images show SDSO to be composed of broad streaks of diffuse emission aligned northeast–southwest. Deep Hα images reveal no strong coincident emission suggesting a high [O iii]/Hα ratio. We also find no other [O iii] emission nebulosity as bright as SDSO within several degrees of M31 and no filamentary Hα emission connected to SDSO. Optical spectra taken along the nebula’s northern limb reveal [O iii] λ λ4959, 5007 emissions matching the location and extent seen in our [O iii] images. The heliocentric velocity of this [O iii] nebulosity is −9.8 ± 6.8 km s−1 with a peak surface brightness of (4 ± 2) × 10−18 erg s−1 cm−2 arcsec−2 (∼0.55 Rayleigh). We discuss SDSO as a possible unrecognized supernova remnant, a large and unusually nearby planetary nebula, a stellar bow shock nebula, or an interaction of M31's outer halo with Local Group circumgalactic gas. We conclude that galactic origins for SDSO are unlikely and favor instead an extragalactic M31 halo–circumgalactic cloud interaction scenario, despite the nebula’s low radial velocity. We then describe new observations that may help resolve the nature and origin of this large nebulosity so close to M31 in the sky.

show abstract

QUIJOTE Scientific Results – XVII. Studying the anomalous microwave emission in the Andromeda Galaxy with QUIJOTE-MFI

Fernández-Torreiro,

Génova-Santos,

Rubiño-Martín

et al. 2023

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The Andromeda Galaxy (M31) is the Local Group galaxy that is most similar to the Milky Way (MW). The similarities between the two galaxies make M31 useful for studying integrated properties common to spiral galaxies. We use the data from the recent QUIJOTE-MFI Wide Survey, together with new raster observations focused on M31, to study its integrated emission. The addition of raster data improves the sensitivity of QUIJOTE-MFI maps by almost a factor 3. Our main interest is to confirm if anomalous microwave emission (AME) is present in M31, as previous studies have suggested. To do so, we built the integrated spectral energy distribution of M31 between 0.408 and 3000 GHz. We then performed a component separation analysis taking into account synchrotron, free-free, AME and thermal dust components. AME in M31 is modelled as a log-normal distribution with maximum amplitude, AAME, equal to 1.03 ± 0.32 Jy. It peaks at νAME = 17.2 ± 3.2 GHz with a width of WAME = 0.58 ± 0.16. Both the Akaike and Bayesian Information Criteria find the model without AME to be less than 1% as probable as the one taking AME into consideration. We find that the AME emissivity per 100 μm intensity in M31 is ${\epsilon _{\rm AME}^{\rm 28.4\, GHz}}=9.6\pm 3.1\, \mathrm{\mu }$K/(MJy/sr), similar to that of the MW. We also provide the first upper limits for the AME polarization fraction in an extragalactic object. M31 remains the only galaxy where an AME measurement has been made of its integrated spectrum.

show abstract

The C-Band All-Sky Survey (C-BASS): new constraints on the integrated radio spectrum of M 31

Cited by 5 publications

References 90 publications

Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations

Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations

The Spatial and Emission Properties of the Large [O iii] Emission Nebula Near M31

QUIJOTE Scientific Results – XVII. Studying the anomalous microwave emission in the Andromeda Galaxy with QUIJOTE-MFI

Contact Info

Product

Resources

About