The Emission Structure of Formaldehyde MegaMasers

Abstract

The formaldehyde MegaMaser emission has been mapped for the three host galaxies IC\,860. IRAS\,15107$+$0724, and Arp\,220. Elongated emission components are found at the nuclear centres of all galaxies with an extent ranging between 30 to 100 pc. These components are superposed on the peaks of the nuclear continuum. Additional isolated emission components are found superposed in the outskirts of the radio continuum structure. The brightness temperatures of the detected features ranges from 0.6 to 13.4 $\times 10^4$ K, which confirms their masering nature. The masering scenario is interpreted as amplification of the radio continuum by foreground molecular gas that is pumped by far-infrared radiation fields in these starburst environments of the host galaxies.

Accepted MNRAS

References in corpus (12)

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Cited by in corpus (13)

• Fast, Collimated Outflow in the Western Nucleus of Arp 220
• The hidden heart of the luminous infrared galaxy IC 860 I. A molecular inflow feeding opaque, extreme nuclear activity
• Class I methanol masers in NGC253: Alcohol at the end of the bar
• VLBI Observations of a sample of Palomar-Green quasars I: parsec-scale morphology
• A hidden molecular outflow in the LIRG Zw 049.057
• Discovery of Methanimine Megamasers Toward Compact Obscured Galaxy Nuclei
• Detection of HC${}_3$N maser emission in NGC253
• Revisiting the formaldehyde masers
• The OH Megamaser Emission in Arp\,220: the rest of the story
• An Imaging and Spectroscopic Exploration of the Dusty Compact Obscured Nucleus Galaxy Zw~049.057
• Extragalactic maser surveys
• Notes on the formaldehyde masers
• The Maser-Starburst connection in NGC253